JPH0514868A - Crosstalk removing device and crosstalk removing method - Google Patents

Abstract

(57) [Abstract] [Purpose] To reliably remove crosstalk that occurs between a reproduced multiplex signal and a video signal without causing a malfunction. [Structure] The waveform extraction unit 104 extracts a reference signal portion of a video signal. The position detection unit 105 detects the position of the reference signal. The waveform extraction unit 106 extracts the signal portion of the reproduction multiplex signal at the same position as the position of the reference signal of the video signal. The crosstalk alignment unit 107 derives the position of the reference signal of the crosstalked video signal in the signal portion of the reproduction multiplexed signal based on the position of the reference signal of the video signal. The tap coefficient setting unit 108 extracts the reference signal of the crosstalked video signal from the signal portion of the reproduction multiplex signal, calculates the tap coefficient, and calculates the two-dimensional transversal filter 103.
Set the tap coefficient of.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission signal reproducing apparatus for receiving and reproducing a transmission signal formed by multiplexing another signal on a current television broadcast signal, and more particularly to a crosstalk for removing crosstalk. The present invention relates to a removing device and a crosstalk removing method.

[0002]

2. Description of the Related Art As a method of multiplexing another signal on a television signal, a quadrature modulation in which a carrier having a quadrature relationship with a video carrier is modulated with other information and is combined with a video carrier modulated with the video signal for transmission. The scheme is known.

[0003] However, this method is based on the 1988 National Television Society National Conference Lectures published by the Television Society of Japan, pp. 329 to 330, page 15-8, "Examination of Waveform Equalization in Video Carrier Quadrature Modulation EDTV System". As discussed in (1), a signal having other information (hereinafter, due to imbalance of filter characteristics between the transmitting side and the receiving side, deviation of detection of the receiver, ghost interference, etc.)
Crosstalk occurs between the video signal and the video signal). It is necessary to use a waveform equalization technique to remove this crosstalk.

An example of removing this crosstalk is disclosed in Japanese Patent Application Laid-Open No. 63-109676 or Japanese Patent Application Laid-Open No. 2-1215.
As described in Japanese Patent Laid-Open No. 88, the known reference signals are respectively inserted in the video signal and the multiplexed signal in advance, and the receiving side performs the synchronous detection with the detection phases of the two orthogonal axes to separate and demodulate. A two-dimensional transversal filter that passes the two demodulated signals through two delay lines with taps, and combines the delayed signals with appropriate weights determined using the received reference signal. It is used.

[0005]

However, in the above-mentioned prior art, in removing the crosstalk, the positional relationship between the reference signal and the crosstalked signal is unclear or is separated and demodulated. There is a problem that the crosstalk removing operation is not normally performed due to a delay error between the two demodulated signals. An object of the present invention is to solve the above-mentioned problems of the prior art and to reliably remove crosstalk generated between a reproduced multiplex signal and a video signal without malfunction. And to provide a crosstalk removal method.

[0006]

In order to achieve the above object, the present invention is provided with a two-line tapped delay line for inputting a reproduced video signal and a multiplexed signal, each with the tapped tap. A two-dimensional transversal filter for delaying with a delay line, combining with a desired weight, removing the crosstalk from the video signal included in the multiplex signal, and outputting the multiplex signal, First reference signal extracting means for extracting and outputting a signal portion in which a first reference signal exists from the reproduced video signal, and the reproduced multiple signal or the two-dimensional transversal filter. A cross toe that extracts and outputs, from the multiplex signal, a signal portion in which the crosstalk signal based on the first reference signal, which is included as the crosstalk in the multiplex signal, is extracted. Extraction means, from said signal portions output from said first reference signal extraction means, detecting the position of said first reference signal, first to output the detection result
Of the reference signal position detecting means and the reproduction signal output from the first reference signal position detecting means in the reproduced multiplex signal or the multiplex signal output from the two-dimensional transversal filter. Based on the crosstalk signal position deriving means for deriving the position of the crosstalk signal included in, and the derivation result of the crosstalk signal position deriving means and the signal portion output from the crosstalk extracting means. And a tap coefficient setting means for setting the tap coefficient of the transversal filter.

Further, a second reference signal extraction for extracting and outputting a signal portion in which the second reference signal exists from the reproduced multiple signal or the multiple signal output from the two-dimensional transversal filter. Means and the second
From the signal portion output from the reference signal extraction means of,
Second reference signal position detection means for detecting the position of the second reference signal and outputting the detection result, the detection result output from the first reference signal position detection means, and the second reference A relative positional relationship between the first reference signal and the second reference signal is obtained from the detection result output from the signal position detecting means, and the reproduced video signal is obtained from the relative positional relationship. And a delay error detecting means for detecting a delay error with the multiplex signal.

[0008]

The first reference signal extracting means extracts the signal portion in which the first reference signal exists from the reproduced video signal. The crosstalk extraction means includes, from the regenerated multiplex signal or the multiplex signal output from the two-dimensional transversal filter, crosstalk based on the first reference signal, which is included in the multiplex signal as the crosstalk. The signal portion where the signal exists is extracted. The first reference signal position detection means detects the position of the first reference signal from the signal portion output from the first reference signal extraction means by a method such as peak detection.

The crosstalk signal position deriving means outputs the regenerated multiplex signal or the two-dimensional transversal filter based on the detection result output from the first reference signal position detecting means. The position of the crosstalk signal included in the multiplex signal is derived. The tap coefficient setting means sets the tap coefficient of the two-dimensional transversal filter based on the derivation result of the crosstalk signal position deriving means and the signal portion output from the crosstalk extracting means. The two-dimensional transversal filter delays the reproduced video signal and the multiplex signal by the tapped delay line, and then synthesizes them by weighting them with a desired weight, from the video signal included in the multiplex signal. Eliminate crosstalk.

Further, the second reference signal extracting means extracts a signal portion in which the second reference signal exists from the regenerated multiplex signal or the multiplex signal output from the two-dimensional transversal filter. . The second reference signal position detection means detects the position of the second reference signal from the signal portion output from the second reference signal extraction means. The delay error detection means determines the first reference signal based on the detection result output from the first reference signal position detection means and the detection result output from the second reference signal position detection means. The relative positional relationship with the second reference signal is obtained, and the delay error between the reproduced video signal and the multiplexed signal is detected from the relative positional relationship.

Therefore, according to the present invention, in removing the crosstalk, the positional relationship between the reference signal and the crosstalk signal is unclear, or a delay error between the two demodulated signals separated and demodulated. Even if there is such a problem, the crosstalk removing operation can be normally performed, so that the crosstalk generated between the reproduced multiplex signal and the video signal can be reliably removed.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a two-dimensional waveform equalizing circuit which is a crosstalk removing device as a first embodiment of the present invention. The two-dimensional waveform equalization circuit of FIG. 1 removes crosstalk from a video signal to a multiplexed signal.

In FIG. 1, 101 is a multiple signal input terminal, 102 is a video signal input terminal, 103 is a two-dimensional transversal filter, 104 is a waveform extracting section, 105 is a position detecting section, 106 is a waveform extracting section, and 107 is a cross. A talk position adjusting unit, 108 is a tap coefficient setting unit, 109 is a multiple signal output terminal, and 110 is an arithmetic processing unit including a position detecting unit 105, a crosstalk position adjusting unit 107, and a tap coefficient setting unit.

First, a description will be given of how the multiplexed signal input to the multiplexed signal input terminal 101 and the video signal input to the video signal input terminal 102 are reproduced. FIG. 2 is a block diagram showing an example of a general multiplex signal generator. In FIG. 2, 201 is an audio signal input terminal and 202 is an FM
Modulator, 203 primary color signal input terminal, 204 synchronization signal input terminal, 205 matrix circuit, 206 luminance signal processing circuit, 207 color difference signal processing circuit, 208 synthesis circuit, 209 video modulator, 210 residual A transmission VSB (Vestigial Sideband) filter for sideband amplitude modulation, 211 is a quadrature multiplex signal input terminal, 212 is a video signal carrier generator, 213 is a phase shifter, and 214 is a quadrature multiplex signal modulation. 215, a signal processing circuit, 216, an equalizer, 217, 218, an adder, 219, an up converter for channel selection, and 220, an antenna.

The audio signal input from the audio signal input terminal 201 is FM-modulated in the FM modulator 202. Also, the RGB three primary color signals input from the primary color signal input terminal 203 are divided into a luminance signal and a color difference signal by the matrix circuit 205, processed by the luminance signal processing circuit 206 and the color difference signal processing circuit 207, respectively, and then the synchronization signal input terminal 204. According to the timing of the synchronizing signal input from
The combination is performed in step 8 to obtain a video signal. With this video signal, the carrier wave from the video signal carrier wave generator 212 is transferred to the video modulator 209.
, And the transmission VSB filter 210 band-limits it to the television broadcasting band. After that, the adder 218 adds the voice-modulated wave, the up-converter 219 selects the channel, and the signal is transmitted from the antenna 220.

On the other hand, the signal processing circuit 215 performs addition of error correction codes, scrambling, baseband modulation, etc. on the multiplexed signal to be orthogonally multiplexed input from the orthogonal multiplexed signal input terminal 211. Then, this signal processing circuit 215
The video signal carrier, which is 90 degrees phase-shifted via the phase shifter 213, is modulated by the modulator 214 by the output signal of 1 to obtain a quadrature modulation signal. The output signal of the modulator 214 has an equalizer 216 having a characteristic opposite to that of the Nyquist filter of the video signal IF in the transmission signal reproducing apparatus described later.
Then, the frequency characteristic is corrected, and then the adder 217 adds the carrier wave modulated with the video signal. As a result, the image carrier wave is modulated in the orthogonal relationship with the image signal and the multiplex signal.

FIG. 3 is a block diagram showing an example of a transmission signal reproducing apparatus having the two-dimensional waveform equalizing circuit of FIG. Figure 3
The transmission signal reproducing device of 1 receives the signal transmitted from the multiple signal generating device of FIG.

In FIG. 3, 301 is an antenna and 302 is
Is a high frequency amplifier circuit, 303 is a frequency conversion circuit, 304 is a local oscillation circuit, 305 is a channel selection control circuit, 306 is a Nyquist filter, 307 is a video signal detection circuit, 308 is an audio FM detection circuit, and 309 is an audio signal output terminal, 310 is a video signal output terminal, 311, 326 is a band pass filter, 312 is a local oscillation circuit, 313, 314 is a frequency conversion circuit, 315, 316 is a synchronous detection circuit, 317 is a two-dimensional waveform equalization circuit, 318 is a multiple signal. Output terminals, 319,
320 is a frequency converter, 321 and 325 are multiplication circuits, 322 is a low-pass filter, 323 is a quadrature carrier wave oscillation circuit, and 324 is a phase shift circuit.

A television signal input from the antenna 301 is amplified by a high frequency amplifier circuit 302 and converted by a frequency conversion circuit 303 into an intermediate frequency for demodulation. The tuning of the television signal is performed by controlling the frequency of the local oscillation circuit 304 added to the frequency conversion circuit 303 by the tuning control circuit 305. After that, in a Nyquist filter 306 that has a Nyquist characteristic centered on a video signal carrier and extracts a video signal band as described below,
A video signal band signal is obtained from the frequency-converted intermediate frequency signal, amplified and detected by the video signal detection circuit 307, and a video signal is obtained at the video signal output terminal 310.

On the other hand, for the audio signal band, the output signal of the video signal detection circuit 307 is amplified and detected by the audio FM detection circuit 308 to obtain an audio signal at the audio signal output terminal 309. In addition to the above, in order to demodulate the multiplexed signal, the frequency conversion circuit 3 is used in the band pass filter 311 having a symmetrical amplitude characteristic with respect to the video signal carrier as described later.
A multiplex signal band is extracted from the output signal of No. 03, and the frequency conversion circuit 313 sets it to an intermediate frequency lower than the intermediate frequency for video signal demodulation. After that, the output signal of the frequency conversion circuit 313 is detected by the synchronous detection circuit 315 to obtain a multiplexed signal.

The Nyquist filter 30 is used in the bandpass filter 326 having the characteristic of limiting the multiplexed signal band symmetrical about the video signal carrier as described later.
The multiplex signal band is extracted from the output signal of No. 6, and the frequency conversion circuit 314 sets it to an intermediate frequency lower than the intermediate frequency for video signal demodulation. In the synchronous detection circuit 316, the output signal of the frequency conversion circuit 314 is detected by the carrier wave having a phase difference of 90 degrees from that of the synchronous detection circuit 315, and the video signal within the multiple signal band is obtained.

After that, the output signals of the synchronous detection circuit 315 and the synchronous detection circuit 316 are passed through a two-dimensional waveform equalization circuit 317 for waveform equalization, and a multiplexed signal is obtained at a multiplexed signal output terminal 318. Since the frequency conversion circuit 313 and the frequency conversion circuit 314 can operate the synchronous detection circuit 315 and the synchronous detection circuit 316 at an intermediate frequency lower than the intermediate frequency for video signal demodulation, the delay time of the synchronous detection circuit and the delay of the signal line. You can reduce the error due to time,
It enables stable detection and demodulation operation.

The frequency conversion circuit 313 and the frequency conversion circuit 314 are composed of a frequency converter 319 and a frequency converter 320, respectively, and the same local oscillator circuit 31 is used.
By operating at 2, the synchronous detection circuit 315 and the synchronous detection circuit 316 have the same operating frequency.

Further, in the synchronous detection circuit 315 and the synchronous detection circuit 316, since the multiplication circuit 321 corresponds to the phase detection circuit of the carrier wave recovery PLL circuit, its output is fed back to the orthogonal carrier wave oscillation circuit 323 through the low-pass 322. As a result, orthogonal carrier waves are reproduced. The orthogonal carrier wave is obtained through the phase shift circuit 324 to obtain the in-phase carrier wave, and the multiplication circuit 3
In addition to 25.

FIG. 4 is a characteristic diagram showing the characteristic of each filter in FIG. 3 and the frequency spectrum of the signal before and after the filter input / output. In FIG. 4, reference numeral 401 is the frequency spectrum of the video signal before filter input, 402 is the frequency spectrum of the multiplexed signal before filter input, 403 is the filter characteristic of the Nyquist filter 306, 404 is the filter characteristic of the bandpass filters 311 and 326, and 405. , 407 is the frequency spectrum of the video signal after filter output, 406,
Reference numeral 408 is the frequency spectrum of the multiplexed signal after filter output. Further, f _C is a video signal carrier frequency, f _Q is a multiple signal band before modulation, and f _I is a video signal band before modulation.

Further, in FIG. 4, (a) is a signal path for demodulating a video signal in the multiple signal band of FIG. 3,
(B) is a signal path for demodulating the multiplexed signal of FIG. When demodulating a video signal within the multiple signal band, the frequency conversion circuit 30 having frequency spectra 401 and 402 is used.
Signals having frequency spectra 405 and 406 are obtained by passing the output signal of No. 3 through the Nyquist filter 306 having the filter characteristic 403 and further through the band filter 326 having the filter characteristic 404. That is, the Nyquist filter 306 has a Nyquist characteristic centered on the video signal carrier, and the bandpass filter 3
Since 26 has a symmetrical amplitude characteristic with respect to the video signal carrier, sidebands within the band of the multiplexed signal transmitted with the opposite characteristic with respect to the video signal carrier can be extracted symmetrically.

That is, when demodulating a video signal within the multiple signal band, the frequency spectrum 406 of the multiple signal has an amplitude characteristic symmetrical with respect to the carrier of the video signal, and the frequency spectrum 405 of the video signal and the multiple signal. Since the frequency spectrum 406 of 4 has an orthogonal relationship, it is possible to demodulate a video signal without crosstalk from a multiplex signal by synchronous detection.

When demodulating a multiplexed signal, a frequency conversion circuit 303 having frequency spectra 401 and 402 is provided.
Of the frequency spectrum 40 through the band filter 311 having the filter characteristic 404.
Obtain a signal with 7,408. That is, the bandpass filter 311 has symmetrical amplitude characteristics with respect to the video signal carrier, so that sidebands of the video signal within the band can be extracted symmetrically.

That is, when demodulating a multiplex signal, the frequency spectrum 407 of the video signal has symmetrical amplitude characteristics about the video signal carrier, and the frequency spectrum 407 of the video signal and the frequency spectrum 408 of the multiplex signal are Because of the orthogonal relationship, it is possible to demodulate a multiplexed signal without crosstalk from the video signal by synchronous detection.

On the other hand, due to a ghost or the like, the multiplexed signal output from the synchronous detection circuit 315 and the synchronous detection circuit 31.
Even if crosstalk between these signals occurs in the video signal in the band that is the output of 6, the crosstalk is detected with the reference signal sent from the transmission side as a reference, and those signals are input. By weighting the two-dimensional waveform equalization circuit 317, crosstalk between these signals can be reduced and a high-quality multiplexed signal can be obtained.

Now, the two-dimensional waveform equalizing circuit 317 of this embodiment will be described with reference to FIG. 1 and FIG. Figure 5
FIG. 4 is a waveform diagram showing an example of a reference signal in a video signal, a reference signal in a multiplexed signal, and a demodulated multiplexed signal. In FIG. 5, 501 to 506 represent positions on the time axis. Further, (a) is a waveform of a video signal in two horizontal scanning periods when there is no crosstalk, and
A black level signal is shown at 1 and a reference signal is shown at position 502. (B) is a waveform of a multiplexed signal in two horizontal scanning periods when there is no crosstalk, and a reference signal is shown at position 503 and no signal is shown at position 504. (C)
Is a waveform of a demodulated multiplexed signal (hereinafter referred to as a reproduced multiplexed signal), where position 505 shows a reference signal portion of the reproduced multiplexed signal and position 506 shows a no-signal portion of the reproduced multiplexed signal. It should be noted that this non-signal portion includes crosstalk from the video signal.

Generally, the crosstalk from the multiplexed signal to the video signal is at position 501, and the ghost of the video signal is at position 50.
2, the ghost of the multiplexed signal occurs at the position 503, and the crosstalk from the video signal to the multiplexed signal occurs at the position 504 independently. In FIG. 1, the waveform extraction unit 104 extracts the reference signal portion of the video signal at the position 502, and the position detection unit 105 detects the position of the reference signal. The position detection is performed, for example, by obtaining the maximum peak position by detecting the peak value and regarding that position as the position of the reference signal.

At the same time, the waveform extracting section 106 extracts the signal portion of the reproduction multiplex signal at the position 506 which is the same position as the position 502 where the reference signal of the video signal is inserted. At the position 506 of the reproduction multiplex signal, the reference signal of the video signal crosstalks due to a ghost, a shift of the detection axis of the demodulation synchronous detection, and the like. In the crosstalk alignment unit 107, based on the position of the reference signal of the detected video signal, the reference signal of the crosstalked video signal (that is, the crosstalk signal in the signal portion of the reproduction multiplex signal at the extracted position 506). ).

The tap coefficient setting unit 108 extracts the reference signal of the crosstalked video signal from the extracted signal portion of the reproduced multiplex signal at the position 506, and calculates the tap coefficient using a method such as the ZF method. Then, the tap coefficient of the two-dimensional transversal filter 103 is set. At this time, the tap position of the two-dimensional transversal filter 103 and the position of the reference signal of the crosstalked video signal are made to coincide with each other.

By repeating this operation, crosstalk from the video signal is removed. It should be noted that the signal delay due to the processing time generated in these block diagrams is omitted for convenience of explanation, but similar signals will be treated in the following explanation.

According to this embodiment, the position of the crosstalk from the video signal included in the reproduction multiplex signal can be obtained from the position of the reference signal of the video signal by the operation of the crosstalk alignment section 107 and the like. The normal tap position of the two-dimensional transversal filter 103 can be accurately controlled, and as a result, a stable crosstalk removing operation can be performed.

When the tap coefficient setting unit 108 uses a feedforward method such as a division method to calculate the tap coefficient, the input of the waveform extracting unit 106 is not the output of the two-dimensional transversal filter 103. , May be taken after the multiple signal input terminal 101.

FIG. 6 is a block diagram showing a two-dimensional waveform equalizing circuit which is a crosstalk removing device according to a second embodiment of the present invention. The two-dimensional waveform equalization circuit of FIG. 6 also removes crosstalk from the video signal to the multiplexed signal, as in FIG. 6, the same reference numerals as those in FIG. 1 indicate the same functions, and the other reference numeral 601 is a waveform extraction unit. Figure 1
The point different from is that the position of crosstalk from the video signal is obtained from the position of the reference signal of the multiplex signal. This will be described with reference to the waveform chart of FIG.

When transmitted, the reference signal of the multiplexed signal and the reference signal of the video signal are transmitted with a fixed relative positional relationship. This relative positional relationship (that is, the time gap) is T
And In FIG. 6, the position 503 in the waveform extraction unit 601
The reference signal portion of the multiplex signal of
The position of the reference signal is detected by. The position detection is performed, for example, by obtaining the maximum peak position by detecting the peak value and regarding that position as the position of the reference signal.

At the same time, the waveform extracting section 106 extracts the signal portion of the reproduced multiplex signal at the position 506 which is the same position as the position 502 where the reference signal of the video signal is inserted. At the position 506 of the reproduction multiplex signal, the reference signal of the video signal crosstalks due to a ghost, a shift of the detection axis of the demodulation synchronous detection, and the like.

In the crosstalk alignment section 107, based on the position of the reference signal of the detected multiplex signal, the reference signal of the crosstalked video signal in the signal portion of the reproduced multiplex signal at the extracted position 506 (ie, The position of the crosstalk signal) is derived. That is, the position of the reference signal of the crosstalked video signal located at a position separated from the position of the reference signal of the detected multiplex signal by the relative positional relationship T is obtained.

The tap coefficient setting unit 108 extracts the reference signal of the crosstalked video signal from the extracted signal portion of the reproduced multiplex signal at the position 506, and calculates the tap coefficient using a method such as the ZF method. Then, the tap coefficient of the two-dimensional transversal filter 103 is set. At this time, the tap position of the two-dimensional transversal filter 103 and the position of the reference signal of the crosstalked video signal are made to coincide with each other. This operation is repeated to remove the crosstalk from the video signal.

According to this embodiment, as in the case of FIG.
Since the crosstalk position can be obtained, the normal tap position of the two-dimensional transversal filter can be accurately controlled, and as a result, a stable crosstalk removal operation can be performed.

In this embodiment, the input of the waveform extracting section 601 may be taken not from the output of the two-dimensional transversal filter 103 but from the back of the multiplex signal input terminal 101. Further, in the embodiment of FIG. 1 or FIG. 6, the crosstalk from the video signal to the multiple signal is removed, but the crosstalk from the multiple signal to the video signal can be removed with a similar circuit configuration.

FIG. 7 is a block diagram showing a two-dimensional waveform equalizing circuit which is a crosstalk removing device as a third embodiment of the present invention. The two-dimensional waveform equalizing circuit of FIG. 7 also removes crosstalk from the video signal to the multiplexed signal, as in FIG. 7, the same reference numerals as those in FIG. 1 indicate the same functions, and 701 is a multiple signal input terminal, and 70
2 is a video signal input terminal, 703 is a two-dimensional waveform equalization unit, 7
Reference numeral 04 is a waveform extraction unit, 705 is a multiple signal output terminal, 706
Is a video signal output terminal.

First, a description will be given of how the multiplexed signal input to the multiplexed signal input terminal 701 and the video signal input to the video signal input terminal 702 are reproduced. FIG. 8 is a block diagram showing an example of a transmission signal reproducing apparatus having the two-dimensional waveform equalizing circuit of FIG. The transmission signal reproducing device in FIG. 8 receives the signal transmitted from the multiple signal generating device in FIG. 2, as in FIG.

In FIG. 8, the same reference numerals as those in FIG. 3 indicate the same functions. In addition, 801 is a carrier recovery circuit, 802 is a synchronous detection circuit, 803 is a phase shift circuit, 804 is a two-dimensional waveform equalization circuit, and 805 is an image. A signal output terminal 806 is a multiplex signal output terminal. 8 is different from FIG. 3 in that the two-dimensional waveform equalized output is only a multiplexed signal, but in FIG. 8 it is both a video signal and a multiplexed signal. Further, in FIG. 3, the video signal detection circuit 307 and the synchronous detection circuit 315 for multiplex signal demodulation are operated at different frequencies, but in FIG. 8 they are operated at the same frequency.

That is, the carrier wave reproduction circuit 801 reproduces the carrier wave, and the synchronous detection circuit 802 demodulates the multiplexed signal using the reproduced carrier wave. On the other hand, the reproduced carrier wave is phase-shifted by 90 degrees in the phase shift circuit 803 and input to the video signal detection circuit 307, and the video signal is demodulated by utilizing this. The outputs of the video signal detection circuit 307 and the synchronous detection circuit 802 are passed through a two-dimensional waveform equalization circuit 804 to perform waveform equalization, and a video signal is output to a video signal output terminal 805 and a multiplexed signal is output to a multiplexed signal output terminal 806. obtain.

Now, the two-dimensional waveform equalizing circuit 804 of this embodiment will be described with reference to FIG. In FIG.
A two-dimensional waveform equalizer 703 removes crosstalk and ghost from the multiplexed signal to the video signal. The waveform extraction unit 704 extracts the reference signal portion of the video signal from the output signal of the two-dimensional waveform equalization unit 703, and the position detection unit 105 detects the position of the reference signal. At the same time, the waveform extracting unit 106 extracts the signal portion of the reproduction multiplexed signal that is at the same position as the position where the reference signal of the video signal is inserted.

In the crosstalk alignment section 107, based on the position of the reference signal of the detected video signal, the reference signal of the crosstalked video signal (ie, the crosstalk signal in the signal portion of the extracted reproduction multiplex signal). ). The tap coefficient setting unit 108 extracts the reference signal of the cross-talked video signal from the signal portion of the extracted reproduction multiplex signal, calculates the tap coefficient using a method such as the ZF method, and performs two-dimensional transversal. The tap coefficient of the filter 103 is set. At this time, the tap position of the two-dimensional transversal filter 103 and the position of the reference signal of the crosstalked video signal are made to coincide with each other. This operation is repeated to remove the crosstalk from the video signal.

According to this embodiment, since the reference signal of the video signal after removing the crosstalk or ghost from the video signal to the multiplexed signal can be used, the stable position of the reference signal of the video signal can be extracted. There is an effect that can be done.

FIG. 9 is a block diagram showing a two-dimensional waveform equalizing circuit which is a crosstalk removing device as a fourth embodiment of the present invention. The two-dimensional waveform equalization circuit of FIG. 9 also removes crosstalk from the video signal to the multiplexed signal, as in FIG.

In FIG. 9, the same reference numerals as those in FIG. 7 indicate the same functions. In addition, 901 is a two-dimensional waveform equalization unit, 902 is a two-dimensional transversal filter, 903 is a waveform extraction unit, 904 is a position detection unit, and 905. Is a waveform extraction unit, 906
Is a crosstalk position adjusting unit, 907 is a tap coefficient setting unit, and 908 is an arithmetic processing unit including a position detecting unit 904, a crosstalk position adjusting unit 906, and a tap coefficient setting unit 907.

The operation shown in FIG. 9 is the same as the operation shown in FIG. 7 except that the video signal and the multiplexed signal are exchanged. That is, in FIG.
The two-dimensional waveform equalization unit 901 removes crosstalk and ghost from the video signal to the multiplexed signal. The waveform extraction unit 903 extracts the reference signal portion of the multiplexed signal from the output signal of the two-dimensional waveform equalization unit 901, and the position detection unit 904 detects the position of the reference signal. At the same time, the waveform extraction unit 905 extracts the signal portion of the reproduced video signal at the same position as the position where the reference signal of the multiplex signal is inserted.

In the crosstalk alignment unit 906, based on the position of the reference signal of the detected multiplex signal, the reference signal of the crosstalked multiplex signal in the signal portion of the extracted reproduced video signal (that is, the crosstalk signal). ). The tap coefficient setting unit 907 extracts the reference signal of the crosstalk multiplex signal from the signal portion of the extracted reproduction video signal, calculates the tap coefficient using a method such as the ZF method, and performs two-dimensional transversal. The tap coefficient of the filter 902 is set. At this time, the tap position of the two-dimensional transversal filter 902 and the position of the reference signal of the crosstalk multiplex signal are matched. This operation is repeated to remove crosstalk from the multiplexed signal.

In this embodiment, since the reference signal of the multiplex signal after removing the crosstalk and the ghost from the multiplex signal to the video signal can be used, it is possible to extract the stable position of the reference signal of the multiplex signal. There is.

In this embodiment, the input of the waveform extraction unit 903 may be taken not from the output of the two-dimensional waveform equalization unit 901 but from the back of the multiple signal input terminal 701. Alternatively, the crosstalk position from the multiplex signal to the video signal may be obtained from the output of the two-dimensional transversal filter 902 or the back of the video signal input terminal 702, from the reference signal position of the video signal.

FIG. 10 is a block diagram showing a two-dimensional waveform equalizing circuit which is a crosstalk removing device as a fifth embodiment of the present invention. The two-dimensional waveform equalization circuit of FIG. 10 also removes crosstalk from the video signal to the multiplexed signal, as in FIG.

In FIG. 10, the same reference numerals as those in FIG. 1 indicate the same functions, and 1001 and 1002 are variable delay units.
1003 is a waveform extraction unit, 1004 is a position detection unit, 100
5 is a delay detection unit, 1006 is position detection units 105, 10
04, a crosstalk alignment unit 107, a tap coefficient setting unit 108, and a delay detection unit 1005.

The basic operation of FIG. 10 is the same as that of FIG.
In FIG. 10, consideration is given to the case where an unknown delay error exists in the multiplexed signal and the video signal input from the multiplexed signal input terminal 101 and the video signal input terminal 102.
The operation of FIG. 10 will be described with reference to FIG. FIG. 11 is a waveform diagram showing an example of the reference signal in the video signal, the reference signal in the multiplexed signal, and the demodulated multiplexed signal.

In FIG. 11, reference numerals 1101 to 1104 represent positions on the time axis. Also, (a)
Is a waveform of a video signal in two horizontal scanning periods when there is no crosstalk, and a black level signal at position 1101
A reference signal is shown at position 1102. (B) is a waveform of a multiplexed signal in two horizontal scanning periods when there is no crosstalk. The position 1103 is a reference signal and the position 110 is a reference signal.
No signal is shown at 4. (C) shows the waveform of the reproduced multiplexed signal, where position 1105 shows the reference signal portion of the reproduced multiplexed signal, and position 1106 shows the non-signal portion of the reproduced multiplexed signal. It should be noted that this non-signal portion includes crosstalk from the video signal.

Further, the relative positional relationship between the reference signal of the multiplexed signal and the reference signal of the video signal is constant, and this is referred to as T. In FIG. 10, the position 1102 in the waveform extraction unit 104
When the reference signal portion of the video signal is extracted, the waveform extraction unit 1003 outputs the reference signal portion of the reproduced multiplex signal at position 1105, and the waveform extraction unit 106 outputs the same position as the position 1102 where the reference signal of the video signal is inserted. Position 110
The signal parts of the reproduction multiplexed signal of 6 are extracted respectively. Then, the position detection units 105 and 1004 detect the positions of the respective reference signals and send them to the delay detection unit 1005.

The operation of the delay detector 1005 will be described below. First, the relative positional relationship of each reference signal is obtained. In FIG. 11, the obtained relative positional relationship is indicated by t. When an unknown delay error does not exist in the multiplex signal and the video signal input from the multiplex signal input terminal 101 and the video signal input terminal 102, T and t are equal, but an unknown delay error exists. In this case, a delay error D occurs as shown in FIG. Since T is known, if t is found, the delay error D is also found.

The delay detector 1005 determines the delay error D obtained.
The variable delay units 1001 and 1002 are controlled so as to cancel each of them, and each delay amount is determined. In the example of FIG. 11,
By setting the delay amount D in the variable delay unit 1002 on the video signal side, the delay error can be canceled. The operation after canceling the delay error is the same as in FIG.

According to this embodiment, even if an unknown delay error exists in the reproduced multiplex signal or video signal, the delay error can be canceled out, so that a stable crosstalk removing operation can be performed. There is an effect that can be.

FIG. 12 is a block diagram showing a two-dimensional waveform equalizing circuit which is a crosstalk removing device as a sixth embodiment of the present invention. The two-dimensional waveform equalization circuit of FIG. 12 is also shown in FIG.
Similarly to the above, the crosstalk from the video signal to the multiplexed signal is removed.

In FIG. 12, the same reference numerals as those in FIG. 10 indicate the same functions. In addition, 1201 is a crosstalk alignment unit, 1202 is position detection units 105 and 1004, crosstalk alignment unit 1201, and tap coefficient setting unit 10.
8 is a calculation processing unit including a delay detection unit 1005.

The operation of FIG. 12 is almost the same as that of FIG. 10, except that the output of the delay detection unit 1005 is input to the crosstalk alignment unit 1201. In the crosstalk alignment section 1201, based on the position of the reference signal of the detected video signal and the obtained delay error D, in the signal portion of the extracted reproduction multiplex signal,
The position of the reference signal (that is, the crosstalk signal) of the crosstalked video signal is derived.

The tap coefficient setting unit 108 extracts the reference signal of the crosstalked video signal from the signal portion of the extracted reproduction multiplexed signal, calculates the tap coefficient using a method such as the ZF method, and The tap coefficient of the dimensional transversal filter 103 is set. At this time, the tap position of the two-dimensional transversal filter 103 and the position of the reference signal of the crosstalked video signal are made to coincide with each other. This operation is repeated to remove the crosstalk from the video signal.

According to this embodiment, even if an unknown delay error exists in the reproduced multiplex signal or video signal, the delay error can be changed by changing the tap position reference of the two-dimensional transversal filter. Since they can be canceled, there is an effect that a stable crosstalk removing operation can be performed. Also, the embodiment of FIG. 10 or FIG. 12 can be used in combination with the embodiment of FIG.

FIG. 13 is a block diagram showing a two-dimensional waveform equalizing circuit which is a crosstalk removing device as a seventh embodiment of the present invention. The two-dimensional waveform equalization circuit of FIG. 13 also removes crosstalk from the video signal to the multiplexed signal.

In FIG. 13, FIG. 7, FIG. 9 and FIG.
The same reference numerals as those in FIG.
Reference numeral 02 denotes a crosstalk alignment unit, 1303 denotes position detection units 105 and 904, and crosstalk alignment unit 130.
1, 1302, tap coefficient setting units 108 and 907, and a delay detection unit 1005.

The operation of FIG. 13 is a combination of the operations of FIG. 7 and FIG. 9, and, similarly to FIG. 12, the output of the delay detecting unit 1005 is changed to the crosstalk position adjusting unit 1301.
Input to 1302. Crosstalk alignment unit 13
In 01, based on the position of the detected reference signal of the video signal and the calculated delay error D, the reference signal of the crosstalked video signal (that is, the crosstalk signal) in the signal portion of the extracted reproduction multiplex signal. Derive the position of. Also, in the crosstalk alignment unit 1302, based on the position of the reference signal of the detected multiplex signal and the obtained delay error D, in the signal portion of the extracted reproduction video signal,
The position of the reference signal (that is, the crosstalk signal) of the crosstalk multiplex signal is derived.

After that, the tap coefficient setting unit 108 extracts the reference signal of the crosstalked video signal from the signal portion of the extracted reproduction multiplex signal, and calculates the tap coefficient using a method such as the ZF method. , The tap coefficient of the two-dimensional transversal filter 103 is set. At this time, the tap position of the two-dimensional transversal filter 103 and the position of the reference signal of the crosstalked video signal are made to coincide with each other. Further, the tap coefficient setting unit 907 extracts the reference signal of the crosstalk multiplex signal from the signal portion of the extracted reproduced video signal, calculates the tap coefficient, and sets the tap coefficient of the two-dimensional transversal filter 902. . At this time, the tap position of the two-dimensional transversal filter 902 and the position of the reference signal of the crosstalk multiplex signal are matched.

According to this embodiment, even when an unknown delay error exists in the reproduced multiplex signal or video signal, the delay error can be changed by changing the tap position reference of the two-dimensional transversal filter. Since it can be canceled, crosstalk removal from video signals to multiple signals,
And, there is an effect that crosstalk can be stably removed from the multiplexed signal to the video signal. In this embodiment, the same method as in FIG. 12 is used to cancel the delay error.
A method similar to that of FIG. 10 can also be used.

FIG. 14 is a block diagram showing a two-dimensional waveform equalizing circuit which is a crosstalk removing device as an eighth embodiment of the present invention. The two-dimensional waveform equalization circuit of FIG. 14 also removes crosstalk from the video signal to the multiplexed signal, as in FIG.

In FIG. 14, the same reference numerals as those in FIG. 1 indicate the same functions, and 1401 is a waveform extracting unit, 1402,
1404 is a sequence processing unit, 1403 is a position detection unit,
1405 is a crosstalk alignment unit, 1406 is a sequence processing unit 1402, 1404, a position detection unit 140.
3, a crosstalk alignment unit 1405, and a tap coefficient setting unit 108.

In this embodiment, the present invention is applied to the 8-field sequence adopted in the current clear vision broadcasting. The 8-field sequence is a waveform serving as a reference signal for ghost detection (hereinafter referred to as GCR waveform)
Is transmitted in the form of a sequence which is completed in 8 fields of the video signal, and the receiving side processes this to extract the GCR waveform.

FIG. 15 shows an example of the reference signal of the 8-field sequence of the video signal and the reference signal of the corresponding multiplexed signal. S1 to S8 are reference signals for an 8-field sequence of video signals, and P1 to P8 are reference signals for multiplex signals. Items having the same S and P subscripts indicate that they are multiplexed at the same time.

In the NTSC system, the horizontal synchronizing signal and the luminance signal can have the same waveform in any field, but regarding the color burst and the color component,
The phase differs from field to field and frame to frame, and becomes the same phase in a 4-field cycle. In addition, in many cases, different signals are inserted in the first and second fields as the signal of the line before the GCR waveform insertion. From these relationships, the influence of the preceding line signal is canceled by inserting the GCR waveform over 8 fields as shown in FIG. 15 and performing the calculation of the following equation. That is, the reference signal Sgcr of the video signal is Sgcr = (1/4) · {(S1-S5) + (S6-S2) + (S3-S7) + (S8-S4)} (Equation 1). The 8-field sequence has 2 in 18H (the 18th line existing in the vertical blanking period) and 281H.
The GCR waveform / pedestal waveform is inserted between fields and even between two frames.

On the other hand, the reference signals of the multiplexed signal are from P1 to P
4, P5 to P8 are transmitted in the form of a sequence that is completed in 4 fields, and the receiving side processes this to take out the reference signal of the multiplexed signal. The same signal is inserted in the first and third fields, and the same signal is also inserted in the second and fourth fields as the signal on the line preceding the reference signal insertion of the multiplex signal. The reference signal of the multiplexed signal is the first,
A reference waveform of opposite polarity is inserted in the third field, and the second and
Also in the fourth field, the reference waveform of opposite polarity is inserted. Here, the reference waveform is considered as a sinX / X waveform, for example. The reference signal Pgcr of the multiplex signal is obtained by performing the calculation of the following equation. That is, Pgcr = (1/4) * {(P1-P3)-(P2-P4) + (P5-P7)-(P6-P8)} ... (Equation 2). Further, the crosstalk Pcross from the video signal to the multiplexed signal is Pcross = (1/4) · {(P1-P5) + (P6-P2) + (P3-P7) + (P8-P4)} ... (Equation 3) ), And the crosstalk Scross from the multiplexed signal to the video signal is Scross = (1/4) * {(S1-S3)-(S2-S4) + (S5-S7)-(S6-S8)} ... ( Equation 4).

The description of FIG. 14 will be given with reference to FIG. FIG. 16 is a waveform diagram showing an example of a reference signal in a video signal, a reference signal in a multiplexed signal, a demodulated multiplexed signal, and the like. In FIG. 16, (a) is the waveform of the reference signal (output of the sequence processing unit 1402) of the multiplex signal obtained by performing the operation of (Equation 2), and (b) is obtained by performing the operation of (Equation 1). Further, the waveform of the reference signal of the video signal, (c) is the waveform of the differential reference signal obtained by difference of the reference signal of the video signal (for example, the difference from the reference signal one clock before) is obtained, (d) is It was obtained by performing the operation of (Equation 3) on the demodulated multiplexed signal,
The waveform of the reproduction multiplex signal (output of the sequence processing unit 1404) that has received the crosstalk from the video signal, (e) shows the difference reproduction multiplex signal obtained by subtracting the reproduction multiplex signal that has received the crosstalk from the video signal. It is a waveform.

In FIG. 14, the waveform extracting section 1401 extracts the reference signal portion of the multiplexed signal of each field. The sequence processing unit 1402 performs the operation of (Equation 2) to obtain only the reference signal portion of the multiplexed signal as shown in (a) of FIG. After that, the position detector 1403 detects the position of the reference signal of the multiplex signal. The position detection is performed, for example, by obtaining the maximum peak position by detecting the peak value and regarding that position as the position of the reference signal.

On the other hand, at the same time, the sequence processing unit 14
In 04, the calculation of (Equation 3) is performed to obtain the crosstalk from the video signal to the multiplex signal as shown in (d) of FIG.

In the crosstalk alignment section 1405,
The tap position of the two-dimensional transversal filter 103 and the position of the reference signal of the detected multiplex signal are matched. According to this, the waveform positions of the reproduced multiplex signals are matched. Now, consider the position of the reference signal of the multiplexed signal and the position of the reference signal of the video signal.

The position of the reference signal of the video signal can be obtained from, for example, the peak position of the differential reference signal obtained by subtracting the reference signal of the video signal as shown in FIG. The positional relationship between the signal and the reference signal is always constant. In the example of FIG. 16, the reference signal of the multiplexed signal and the difference reference signal have the same positional relationship. The positional relationship between the reference signal of the video signal ((b) or (c) in FIG. 16) and the crosstalk from the video signal to the multiplexed signal ((d) or (e) in FIG. 16) is also constant. Therefore, if the position of the reference signal of the multiplex signal is known, the position of crosstalk from the video signal to the multiplex signal can be known.

Further, in the tap coefficient setting unit 108, the crosstalk component is extracted from the reproduced multiplex signal, the tap coefficient is calculated using a method such as the ZF method, and the two-dimensional transversal filter 103 is used, as in FIG. Set the tap coefficient of. This operation is repeated to remove the crosstalk from the video signal.

According to this embodiment, the position of the crosstalk from the video signal included in the reproduction multiplex signal can be obtained from the position of the reference signal of the multiplex signal, so that the normal tap position of the two-dimensional transversal filter is obtained. Can control
As a result, a stable crosstalk removing operation can be performed.

FIG. 17 is a block diagram showing a two-dimensional waveform equalizing circuit which is a crosstalk removing device as a ninth embodiment of the present invention. The two-dimensional waveform equalization circuit of FIG. 17 also removes crosstalk from the video signal to the multiplexed signal.

17, the same reference numerals as those in FIGS. 1, 10 and 14 indicate the same functions. In addition, 1701 is a waveform extraction section, 1702 is a sequence processing section, 1703 is a position detection section, and 1704 is crosstalk position adjustment. Part, 1705
Are sequence processing units 1402, 1404, 1702,
Position detecting units 1403 and 1703, crosstalk position adjusting unit 1704, tap coefficient setting unit 108, delay detecting unit 1
005 is an arithmetic processing unit.

The basic operation of FIG. 17 is the same as that of FIG. 14, but in FIG. 17, an unknown delay error exists in the multiplexed signal and the image signal input from the multiplexed signal input terminal 101 and the image signal input terminal 102. The case is taken into consideration.

In FIG. 17, the waveform extraction unit 1401 extracts the reference signal portion of the multiplex signal of each field, and the sequence processing unit 1402 performs the operation of (Equation 2) to obtain the reference signal portion of the multiplex signal. After this, the position detector 14
At 03, the position of the reference signal of the multiplexed signal is detected. On the other hand, at the same time, the sequence processing unit 1404 calculates (Equation 3) to obtain the crosstalk from the video signal to the multiplexed signal.

Further, the waveform extraction unit 1701 extracts the GCR waveform portion of the video signal of each field, and the sequence processing unit 1702 performs the operation of (Equation 1) to obtain the reference signal portion of the video signal. After that, the position detection unit 1703 determines the position of the reference signal of the video signal, for example, as shown in FIG.
As shown in, the difference is taken, and the peak position is detected.

The outputs of the position detectors 1403 and 1703 are
It is sent to the delay detection unit 1005. In the delay detection unit 1005, the multiplexed signal input terminal 101 and the video signal input terminal 102
The unknown delay error existing in the multiplexed signal and the video signal input from is detected. Crosstalk alignment unit 1704
Then, first, the reference of the tap position of the two-dimensional transversal filter 103 is changed so as to cancel the delay error obtained by the delay detection unit 1005, and then the tap position of the two-dimensional transversal filter 103 and the position detection unit 140.
The positions of the reference signals of the multiplex signals detected in 3 are matched.
According to this, the waveform positions of the reproduced multiplex signals are matched.

The tap coefficient setting unit 108 extracts the crosstalk component from the reproduced multiplexed signal, calculates the tap coefficient using a method such as the ZF method, and sets the tap coefficient of the two-dimensional transversal filter 103. This operation is repeated to remove the crosstalk from the video signal.

According to the present embodiment, even when an unknown delay error exists in the reproduced multiplex signal or video signal, the delay error is canceled by changing the tap position reference of the two-dimensional transversal filter. Therefore, there is an effect that a stable crosstalk removing operation can be performed. Although the method similar to that of FIG. 12 is used for canceling the delay error in the present embodiment, a method similar to that of FIG. 10 can also be used.

FIG. 18 is a block diagram showing a two-dimensional waveform equalizing circuit which is a crosstalk removing device as a tenth embodiment of the present invention. The two-dimensional waveform equalization circuit shown in FIG. 18 also removes crosstalk from the video signal to the multiplexed signal.

18, FIG. 10, FIG. 14,
The same reference numerals as those in FIG.
Is a crosstalk alignment unit, 1802 is a sequence processing unit 1402, 1404, 1702, position detecting unit 14
03, 1703, crosstalk alignment unit 1801,
This is an arithmetic processing unit including a tap coefficient setting unit 108 and a delay detection unit 1005.

FIG. 18 is an embodiment in which the reference of the tap position of the two-dimensional transversal filter is obtained from the reference position of the video signal. Further, the multiplex signal input from the multiplex signal input terminal 101 and the video signal input terminal 102, the image This is a consideration when a signal has an unknown delay error.

In FIG. 18, the waveform extraction unit 1401 extracts the reference signal portion of the multiplex signal of each field, and the sequence processing unit 1402 performs the operation of (Equation 2) to obtain the reference signal portion of the multiplex signal. After this, the position detector 14
At 03, the position of the reference signal of the multiplexed signal is detected. On the other hand, at the same time, the sequence processing unit 1404 calculates (Equation 3) to obtain the crosstalk from the video signal to the multiplexed signal.

Further, the waveform extraction unit 1701 extracts the GCR waveform portion of the video signal of each field, and the sequence processing unit 1702 performs the operation of (Equation 1) to obtain the reference signal portion of the video signal. After that, the position detection unit 1703 determines the position of the reference signal of the video signal, for example, as shown in FIG.
As shown in, the difference is taken, and the peak position is detected.

The outputs of the position detectors 1403 and 1703 are
It is sent to the delay detection unit 1005. In the delay detection unit 1005, the multiplexed signal input terminal 101 and the video signal input terminal 102
The unknown delay error existing in the multiplexed signal and the video signal input from is detected. Crosstalk alignment unit 1801
Then, first, the reference of the tap position of the two-dimensional transversal filter 103 is changed so as to cancel the delay error obtained by the delay detection unit 1005, and then the tap position of the two-dimensional transversal filter 103 and the position detection unit 170.
The positions of the reference signals of the video signals detected in 3 are matched.
According to this, the waveform positions of the reproduced multiplex signals are matched.

The tap coefficient setting unit 108 extracts the crosstalk component from the reproduced multiplexed signal, calculates the tap coefficient using a method such as the ZF method, and sets the tap coefficient of the two-dimensional transversal filter 103. This operation is repeated to remove the crosstalk from the video signal.

According to this embodiment, even if an unknown delay error exists in the reproduced multiplex signal or video signal, the delay error can be changed by changing the tap position reference of the two-dimensional transversal filter. Since they can be canceled, there is an effect that a stable crosstalk removing operation can be performed. Although the method similar to that of FIG. 12 is used for canceling the delay error in the present embodiment, a method similar to that of FIG. 10 can also be used.

Although the embodiments of FIGS. 14, 17 and 18 are examples of removing crosstalk from the video signal to the multiplex signal, when removing crosstalk from the multiplex signal to the multiplex signal. Can also be used.

Furthermore, FIG. 1, FIG. 6, FIG. 7, FIG.
0, FIG. 12, FIG. 13, FIG. 14, FIG. 17, and each of the arithmetic processing units 110, 908, 1006, 1202 of FIG.
1303, 1406, 1705, 1802 can be operated and executed by software processing by a microcomputer or the like.

[0107]

According to the present invention, when crosstalk is removed, the positional relationship between the reference signal and the crosstalk signal is unclear, or a delay error occurs between two demodulated signals separated and demodulated. Even if there is such a problem, the crosstalk removing operation can be normally performed, so that the crosstalk generated between the reproduced multiplex signal and the video signal can be reliably removed.

[Brief description of drawings]

FIG. 1 is a block diagram showing a two-dimensional waveform equalizing circuit which is a crosstalk removing device as a first embodiment of the present invention.

FIG. 2 is a block diagram showing an example of a general multiplex signal generator.

3 is a block diagram showing an example of a transmission signal reproducing apparatus having the two-dimensional waveform equalizing circuit of FIG.

FIG. 4 is a characteristic diagram showing characteristics of each filter in FIG. 3 and frequency spectra of signals before and after filter input / output.

FIG. 5 is a waveform diagram showing an example of a reference signal in a video signal, a reference signal in a multiplexed signal, and a demodulated multiplexed signal.

FIG. 6 is a block diagram showing a two-dimensional waveform equalizing circuit which is a crosstalk removing device as a second embodiment of the present invention.

FIG. 7 is a block diagram showing a two-dimensional waveform equalization circuit which is a crosstalk removing device as a third embodiment of the present invention.

8 is a block diagram showing an example of a transmission signal reproducing apparatus having the two-dimensional waveform equalizing circuit of FIG.

FIG. 9 is a block diagram showing a two-dimensional waveform equalization circuit which is a crosstalk removing device as a fourth embodiment of the present invention.

FIG. 10 is a block diagram showing a two-dimensional waveform equalizing circuit which is a crosstalk removing device as a fifth embodiment of the present invention.

FIG. 11 is a waveform diagram showing an example of a reference signal in a video signal, a reference signal in a multiplexed signal, and a demodulated multiplexed signal.

FIG. 12 is a block diagram showing a two-dimensional waveform equalization circuit which is a crosstalk removing device according to a sixth embodiment of the present invention.

FIG. 13 is a block diagram showing a two-dimensional waveform equalizing circuit which is a crosstalk removing device as a seventh embodiment of the present invention.

FIG. 14 is a block diagram showing a two-dimensional waveform equalizing circuit which is a crosstalk removing device as an eighth embodiment of the present invention.

FIG. 15 is a waveform diagram showing an example of a reference signal of an 8-field sequence of a video signal and a reference signal of a multiplexed signal corresponding thereto.

FIG. 16 is a waveform diagram showing an example of a reference signal in a video signal, a reference signal in a multiplexed signal, a demodulated multiplexed signal, and the like.

FIG. 17 is a block diagram showing a two-dimensional waveform equalizing circuit which is a crosstalk removing device as a ninth embodiment of the present invention.

FIG. 18 is a block diagram showing a two-dimensional waveform equalization circuit which is a crosstalk removing device as a tenth embodiment of the present invention.

[Explanation of symbols]

103 ... Two-dimensional transversal filter, 104 ... Waveform extraction unit, 105 ... Position detection unit, 106 ... Waveform extraction unit,
107 ... Crosstalk alignment section, 108 ... Tap coefficient setting section, 110 ... Arithmetic processing section, 601 ... Waveform extraction section,
704 ... Waveform extraction unit, 902 ... Two-dimensional transversal filter, 903 ... Waveform extraction unit, 904 ... Position detection unit,
905 ... Waveform extraction unit, 906 ... Crosstalk alignment unit, 907 ... Tap coefficient setting unit, 908 ... Arithmetic processing unit,
1001 ... Variable delay unit, 1002 ... Variable delay unit, 100
3 ... Waveform extraction section, 1004 ... Position detection section, 1005 ... Delay detection section, 1006 ... Arithmetic processing section, 1201 ... Crosstalk alignment section, 1202 ... Arithmetic processing section, 1301 ...
Crosstalk position aligning unit 1302 ... Crosstalk position aligning unit, 1303 ... Arithmetic processing unit, 1401 ... Waveform extracting unit, 1402 ... Sequence processing unit, 1403 ... Position detecting unit, 1404 ... Sequence processing unit, 1405 ... Crosstalk position aligning unit Unit, 1406 ... Arithmetic processing unit, 1701
... Waveform extraction unit, 1702 ... Sequence processing unit, 1703
... position detection unit, 1704 ... crosstalk alignment unit,
1705 ... Arithmetic processing unit, 1801 ... Crosstalk alignment unit, 1802 ... Arithmetic processing unit.

Claims (18)

[Claims] 1. A first carrier modulated with a first signal having a first reference signal inserted therein, and a first carrier having a second reference signal inserted in a quadrature relationship with the first carrier. In the transmission signal reproducing device for reproducing the first signal and the second signal from the multiplex-transmitted transmission signal, which is formed by synthesizing the second carrier wave modulated by the second signal, two systems are provided. The first reproduced with a tapped delay line of
Signal and the second signal are input, respectively, delayed by the delay line with taps, and then added with desired weights to be combined, and the second signal is included in the second signal. A two-dimensional transversal filter that removes crosstalk from the first signal and outputs the extracted signal portion in which the first reference signal is present is output from the regenerated first signal. The first reference signal extracting means and the second signal reproduced from the second signal or the second signal output from the two-dimensional transversal filter, and included in the second signal as the crosstalk, Crosstalk extracting means for extracting and outputting a signal portion in which a crosstalk signal is present according to the first reference signal, the signal portion output from the first reference signal extracting means, and the crosstalk extracting means Enter an et outputted the signal portion, the cross-talk removing apparatus characterized by comprising and a control means for setting the tap coefficients of the two-dimensional transversal filter based on these signal portions. 2. The crosstalk removing apparatus according to claim 1, wherein the control unit detects the position of the first reference signal from the signal portion output from the first reference signal extraction unit. A first reference signal position detecting means for outputting the detection result, and in the reproduced second signal or the two-dimensional shape based on the detection result output from the first reference signal position detecting means Crosstalk signal position deriving means for deriving the position of the crosstalk signal included in the second signal output from the transversal filter; derivation result of the crosstalk signal position deriving means and output from the crosstalk extracting means. And a tap coefficient setting means for setting a tap coefficient of the two-dimensional transversal filter based on the generated signal portion. Crosstalk removing device to. 3. A first carrier modulated with a first signal having a first reference signal inserted therein, and a first carrier having an orthogonal relationship with the first carrier and having a second reference signal inserted therein. In the transmission signal reproducing device for reproducing the first signal and the second signal from the multiplex-transmitted transmission signal, which is formed by synthesizing the second carrier wave modulated by the second signal, two systems are provided. The first reproduced with a tapped delay line of
Signal and the second signal are input, respectively, delayed by the delay line with taps, and then added with desired weights to be combined, and the second signal is included in the second signal. A two-dimensional transversal filter that removes crosstalk from the first signal and outputs the second signal, and a second signal that is reproduced from the second signal or the second signal output from the two-dimensional transversal filter, A first reference signal extracting means for extracting and outputting a signal portion in which a second reference signal exists, and a second signal reproduced from the second signal or the second signal output from the two-dimensional transversal filter. Crosstalk extracting means for extracting and outputting a signal portion, which is included in the second signal as the crosstalk, in which the crosstalk signal by the first reference signal exists, and the first crosstalk extracting means. Control means for inputting the signal portion output from the quasi-signal extraction means and the signal portion output from the crosstalk extraction means, and setting tap coefficients of the two-dimensional transversal filter based on these signal portions; And a crosstalk removing device. 4. The crosstalk removing apparatus according to claim 3, wherein the control unit detects the position of the second reference signal from the signal portion output from the first reference signal extraction unit. A first reference signal position detecting means for outputting the detection result, and in the reproduced second signal or the two-dimensional shape based on the detection result output from the first reference signal position detecting means Crosstalk signal position deriving means for deriving the position of the crosstalk signal included in the second signal output from the transversal filter; derivation result of the crosstalk signal position deriving means and output from the crosstalk extracting means. And a tap coefficient setting means for setting a tap coefficient of the two-dimensional transversal filter based on the generated signal portion. Crosstalk removing device to. 5. A first carrier modulated with a first signal having a first reference signal inserted therein, and a first carrier having an orthogonal relationship with the first carrier and having a second reference signal inserted therein. In the transmission signal reproducing device for reproducing the first signal and the second signal from the multiplex-transmitted transmission signal, which is formed by synthesizing the second carrier wave modulated by the second signal, two systems are provided. The first reproduced with a tapped delay line of
Signal and the second signal are input, delayed by the tapped delay line, respectively, and then combined with a desired weight, and the first signal is included in the first signal. A first two-dimensional transversal filter for removing crosstalk from the second signal and outputting the crosstalk, and a delay line with two taps are provided, and the reproduced first signal is provided.
Signal and the second signal are input, respectively, delayed by the delay line with taps, and then added with desired weights to be combined, and the second signal is included in the second signal. A second two-dimensional transversal filter that removes crosstalk from the first signal and outputs the first two-dimensional transversal filter, and the first signal that is reproduced or the first two-dimensional transversal filter that is output. From a first signal, a first reference signal extracting means for extracting and outputting a signal portion in which the first reference signal exists, and a reproduced second signal or a second two-dimensional transversal filter. Crosstalk extraction for extracting and outputting, from the output second signal, a signal portion in which the crosstalk signal based on the first reference signal, which is included as the crosstalk in the second signal, is present and output. Stage, the signal portion output from the first reference signal extraction means and the signal portion output from the crosstalk extraction means are input, and the second two-dimensional transversal based on these signal portions is input. A crosstalk removing device comprising: a control unit that sets a tap coefficient of a filter. 6. The crosstalk removing apparatus according to claim 5, wherein the control unit detects the position of the first reference signal from the signal portion output from the first reference signal extraction unit. A first reference signal position detecting means for outputting the detection result, and a second reference signal in the reproduced second signal or the second reference signal based on the detection result output from the first reference signal position detecting means. Crosstalk signal position deriving means for deriving the position of the crosstalk signal included in the second signal output from the two-dimensional transversal filter, and derivation results of the crosstalk signal position deriving means and the crosstalk extraction. Tap coefficient setting means for setting a tap coefficient of the second two-dimensional transversal filter based on the signal portion output from the means. Crosstalk removing device according to claim Rukoto. 7. A first carrier modulated with a first signal having a first reference signal inserted therein and an orthogonal relationship with the first carrier, wherein the first reference signal has been inserted. A second signal in which a second reference signal is inserted at substantially the same position as the position, and a second carrier modulated by the second signal are combined, The second
In the transmission signal reproducing device for reproducing the signal of
Signal and the second signal are input, respectively, delayed by the delay line with taps, and then added with desired weights to be combined, and the second signal is included in the second signal. A two-dimensional transversal filter that removes crosstalk from the first signal and outputs the second signal, and a second signal that is reproduced from the second signal or the second signal output from the two-dimensional transversal filter, A first portion for extracting and outputting a signal portion in which a second reference signal exists and a crosstalk signal according to the first reference signal, which is included in the second signal as the crosstalk, exists. A reference signal extracting means, a control means for inputting the signal portion output from the first reference signal extracting means, and setting a tap coefficient of the two-dimensional transversal filter based on the signal portion. Crosstalk removing apparatus characterized by comprising a. 8. The crosstalk removing apparatus according to claim 7, wherein the control means includes a signal portion in which only the second reference signal exists from the signal portion output from the first reference signal extracting means. And a crosstalk signal for separating and outputting a signal portion where only the crosstalk signal exists from the signal portion output from the first reference signal extracting means. Separation means, first reference signal position detection means for detecting the position of the second reference signal from the signal portion output from the first reference signal separation means, and outputting the detection result, The position of the crosstalk signal existing in the signal portion output from the crosstalk signal separating means is derived based on the detection result output from the first reference signal position detecting means. Crosstalk signal position deriving means for outputting, and a tap for setting the tap coefficient of the two-dimensional transversal filter based on the derivation result of the crosstalk signal position deriving means and the signal portion output from the crosstalk extracting means. A crosstalk removing device comprising: coefficient setting means. 9. The crosstalk removing apparatus according to claim 2, wherein the reproduced second signal or the second signal output from the two-dimensional transversal filter is used to convert the second reference signal from the second signal. Second reference signal extracting means for extracting and outputting an existing signal portion, and detecting the position of the second reference signal from the signal portion output from the second reference signal extracting means, and detecting the position. From a second reference signal position detecting means for outputting a result, the detection result output from the first reference signal position detecting means, and the detection result output from the second reference signal position detecting means, Delay for detecting a relative positional relationship between the first reference signal and the second reference signal, and detecting a delay error between the reproduced first signal and the second signal from the relative positional relationship. Error detection means, A crosstalk removing device characterized by being provided with. 10. The crosstalk removing apparatus according to claim 4, wherein the first signal is reproduced from the first signal reproduced.
Second for extracting and outputting the signal part in which the reference signal of
Second reference signal position detecting means for detecting the position of the first reference signal from the signal portion output from the second reference signal extracting means and outputting the detection result. From the detection result output from the first reference signal position detection means and the detection result output from the second reference signal position detection means, the first reference signal and the second reference signal And a delay error detecting means for detecting a delay error between the reproduced first signal and the reproduced second signal based on the relative position relationship between the first and second reproduced signals. Crosstalk removing device. 11. The crosstalk removing apparatus according to claim 6, wherein the reproduced second signal or the second signal is reproduced.
Second reference signal extraction means for extracting and outputting a signal portion in which the second reference signal exists from the second signal output from the two-dimensional transversal filter, and the second reference signal extraction Second reference signal position detecting means for detecting the position of the second reference signal from the signal portion output from the means and outputting the detection result; and output from the first reference signal position detecting means. The relative position relationship between the first reference signal and the second reference signal is obtained from the detection result and the detection result output from the second reference signal position detection means, and the relative position is obtained. From the relationship, there is provided a delay error detecting means for detecting a delay error between the reproduced first signal and the reproduced second signal, and a crosstalk removing device. 12. The crosstalk removing apparatus according to claim 8, wherein the first signal is reproduced from the first signal reproduced.
Second reference signal for extracting and outputting a signal portion in which the reference signal is present and the crosstalk signal by the second reference signal included in the first signal as the crosstalk is present. Extracting means; second reference signal separating means for separating and outputting a signal portion in which only the first reference signal exists from the signal portion output from the second reference signal extracting means; Second reference signal position detecting means for detecting the position of the first reference signal from the signal portion output from the reference signal separating means, and outputting the detection result, and the first reference signal position detecting means. From the detection result output from the means and the detection result output from the second reference signal position detection means, a relative positional relationship between the first reference signal and the second reference signal is obtained, Is that relative position Crosstalk removing device being characterized in that the delay error detection means for detecting a delay error between the first signal reproduced and a second signal, the provided. 13. The crosstalk removing apparatus according to claim 9, 10, 11 or 12, wherein the reproduced first signal is delayed and the delay error is detected according to the delay error detected by the delay error detecting means. And delays the reproduced second signal by the first variable delay means whose delay amount changes, and according to the delay error detected by the delay error detection means,
A crosstalk removing device, characterized in that both or either of the second variable delay means whose delay amount changes is provided. 14. The crosstalk removing apparatus according to claim 9, 10, 11 or 12, wherein the crosstalk signal position deriving means outputs from the reference signal position detecting means when deriving the position of the crosstalk signal. A crosstalk removing device, wherein the position of the crosstalk signal is derived based on the delay error detected by the delay error detecting means in addition to the detected result. 15. A first carrier modulated with a first signal having a first reference signal inserted therein and a first carrier having an orthogonal relationship with the first carrier and having a second reference signal inserted therein. When the first signal and the second signal are reproduced from a multiplex-transmitted transmission signal obtained by synthesizing a second carrier wave modulated with a second signal, the reproduced first signal The first signal and the second signal are input to the two-dimensional transversal filter, delayed by the delay lines with taps in the two-dimensional transversal filter, and then combined with desired weights, The second
In the crosstalk removing method for removing the crosstalk from the first signal included in the second signal by outputting the first signal, the first reference signal is reproduced from the reproduced first signal. A reference signal extraction process for extracting a signal portion in which a signal exists, and the crosstalk in the second signal from the reproduced second signal or the second signal passed through the two-dimensional transversal filter. A crosstalk extraction step of extracting a signal portion in which a crosstalk signal exists according to the first reference signal, and a position of the first reference signal from the signal portion extracted in the reference signal extraction step. Detecting a reference signal position, and the second reproduced signal based on the position of the first reference signal detected in the reference signal position detecting process. A crosstalk signal position deriving step of deriving a position of the crosstalk signal included in the signal or of the second signal through the two-dimensional transversal filter; and the cross derived in the crosstalk signal position deriving step. A tap coefficient setting step of setting a tap coefficient of the two-dimensional transversal filter based on a position of a talk signal and the signal portion extracted in the crosstalk extracting step, and Crosstalk removal method. 16. A first carrier modulated with a first signal having a first reference signal inserted therein and a first carrier having an orthogonal relationship with the first carrier and having a second reference signal inserted therein. When the first signal and the second signal are reproduced from a multiplex-transmitted transmission signal obtained by synthesizing a second carrier wave modulated with a second signal, the reproduced first signal The first signal and the second signal are input to the two-dimensional transversal filter, delayed by the delay lines with taps in the two-dimensional transversal filter, and then combined with desired weights, The second
In the crosstalk removing method for removing the crosstalk from the first signal included in the second signal by outputting the second signal, the reproduced second signal or the two-dimensional transversal filter From the second signal via
A reference signal extracting step of extracting a signal portion in which the reference signal exists, and the second signal reproduced or the second signal passed through the two-dimensional transversal filter, in the second signal. A crosstalk extraction step of extracting a signal portion in which a crosstalk signal based on the first reference signal exists, which is included as crosstalk, and the second reference signal from the signal portion extracted in the reference signal extraction step. Position detecting step for detecting the position of the second signal and the two-dimensional transversal filter in the reproduced second signal based on the position of the second reference signal detected in the reference signal position detecting step. Crosstalk signal position deriving process for deriving the position of the crosstalk signal included in the second signal via the crosstalk signal, Based on the position of the crosstalk signal derived in the signal position deriving step and the signal portion extracted in the crosstalk extraction step, a tap coefficient setting step of setting the tap coefficient of the two-dimensional transversal filter, A method for removing crosstalk, comprising: 17. A first carrier modulated with a first signal having a first reference signal inserted therein, and a first carrier having an orthogonal relationship with the first carrier and having a second reference signal inserted therein. When the first signal and the second signal are reproduced from a multiplex-transmitted transmission signal obtained by synthesizing a second carrier wave modulated with a second signal, the reproduced first signal The first signal and the second signal are input to the first two-dimensional transversal filter, delayed by tapped delay lines in the first two-dimensional transversal filter, and then the desired weights are set. By adding and combining and outputting the first signal, crosstalk from the second signal included in the first signal is removed, and the reproduced first signal and the first signal are reproduced. 2 signals to the second 2D transversal filter And delaying them with a tapped delay line in the second two-dimensional transversal filter, combining them with desired weights, and outputting the second signal to output the second signal. A crosstalk removing method for removing crosstalk from the first signal included in the second signal, the first signal being regenerated through the first signal or the first two-dimensional transversal filter. A reference signal extraction step of extracting a signal portion in which the first reference signal exists from the signal, and the reproduced second signal or the second signal through the second two-dimensional transversal filter. A crosstalk extracting step of extracting a signal portion in which the crosstalk signal according to the first reference signal exists, which is included as the crosstalk in the second signal, A reference signal position detecting step of detecting the position of the first reference signal from the signal portion extracted in the reference signal extracting step, and a position of the first reference signal detected in the reference signal position detecting step. A crosstalk signal position deriving step of deriving a position of the crosstalk signal contained in the reproduced second signal or in the second signal through the second two-dimensional transversal filter based on the A tap coefficient of the second two-dimensional transversal filter is set based on the position of the crosstalk signal derived in the crosstalk signal position derivation process and the signal portion extracted in the crosstalk extraction process. A crosstalk removing method, comprising: a tap coefficient setting process. 18. A first carrier modulated with a first signal having a first reference signal inserted therein, and a first carrier having an orthogonal relationship with the first carrier and having a second reference signal inserted therein. When the first signal and the second signal are reproduced from a multiplex-transmitted transmission signal obtained by synthesizing a second carrier wave modulated with a second signal, the reproduced first signal The 1st signal and the 2nd signal are input to the two-dimensional transversal filter, delayed by the tapped delay lines in the two-dimensional transversal filter, and then combined with desired weights, The second
In the crosstalk removing method for removing the crosstalk from the first signal included in the second signal by outputting the first signal, the first reference signal is reproduced from the reproduced first signal. A first reference signal extraction step of extracting a signal portion in which a signal exists, and a second reference signal reproduced from the second signal or the second signal passed through the two-dimensional transversal filter.
Second reference signal extraction step of extracting the existing signal portion of the second reference signal, and the second signal from the reproduced second signal or the second signal passed through the two-dimensional transversal filter. A crosstalk extraction step of extracting a signal portion in which a crosstalk signal by the first reference signal exists, which is included as the crosstalk therein, and from the signal portion extracted in the first reference signal extraction step, A first for detecting the position of the first reference signal
Second step of detecting the position of the second reference signal from the signal portion extracted in the second reference signal extracting step.
Of the reference signal position detection step, the position of the first reference signal detected in the first reference signal position detection step, and the second reference signal detected in the second reference signal position detection step. A crosstalk signal position deriving step of deriving a position of the crosstalk signal included in the reproduced second signal or in the second signal through the two-dimensional transversal filter based on the position; A tap coefficient setting step of setting a tap coefficient of the two-dimensional transversal filter based on the position of the crosstalk signal derived in the crosstalk signal position deriving step and the signal portion extracted in the crosstalk extraction step. And a crosstalk removing method comprising: