JPH0564236A - How to construct a television signal - Google Patents

Abstract

PURPOSE:To provide the constitution method and device for a television signal in which the complete separation of a multiple signal on a reception side is possible and a resolution characteristic is excellent. CONSTITUTION:When the frequency multiplexing of a color signal C and high definition information YH' is performed for a luminance signal medium band component Ym, a signal multiplexing is performed for the luminance signal medium band component Ym by the signal component of a field line pair whose cycle is one frame, and for the color signal C and the high definition information YH' by the signal component of a field line pair whose cycle are two frames. Therefore, the separation of a multiple signal without a crosstalk on a reception side can be performed and the reproduction of high picture quality television picture in which a resolution characteristic is excellent becomes possible.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for constructing a television signal, and more particularly to a method and apparatus for constructing a television signal suitable for transmitting an image having excellent resolution characteristics.

[0002]

2. Description of the Related Art Research on an EDTV for transmitting high-definition and high-definition images while maintaining compatibility with the current television system has been advanced. EDTV superimposes high-definition information on vacant frequency bands that are not used in the current television system and transmits it. The receiving side uses these high-definition information to achieve high image quality and high definition. To do.

There are various forms of superimposing the high-definition information in the frequency band of the current television system, and in any of these methods, the receiving side must separate and extract the high-definition information. If the separation / extraction operation is incomplete, crosstalk occurs, resulting in deterioration of image quality. Therefore, superposition of high-definition information in the form of field line pairs has been devised as a method capable of complete separation without crosstalk in the operation of separation and extraction on the receiving side. In the signal multiplexing according to this mode, the scanning lines forming the field line pair are multiplexed by using the signal composed of the same component, and on the receiving side, the multiplexed signal is calculated by the operation between the signals of the scanning lines of the field line pair. Achieve complete separation of.

[0004]

In the superimposition of high-definition information by the above field line pairs, one field line pair is formed by a plurality of frames, and signals of the same component are assigned to the scanning lines of these plurality of frames.
There is a problem that the resolution characteristic in the time direction is impaired.

An object of the present invention is to provide a method and an apparatus for constructing a television signal by signal multiplexing of field line pairs, which matches human visual characteristics and has little deterioration in resolution characteristics in the time direction.

[0006]

According to the present invention, the middle range component (2) of a luminance signal having a high visual resolution characteristic in the time direction is used.
˜4.2 MHz band component), field line pairs are formed with one frame as a cycle. On the other hand, for color signals and high-definition information, which have poor visual resolution characteristics in the time direction, a field line pair having a cycle of two frames is formed. Therefore, in the present invention, the resolution characteristic in the time direction of the luminance signal middle frequency component is improved twice as compared with the characteristic of the color signal and the high definition information, and the television signal is configured in a form matched with the visual characteristic. Will be possible.

Further, since the signal is multiplexed by the field line pair, the color signal and the high-definition information can be completely separated on the receiving side by the arithmetic operation between fields and frames.

[0008]

The principle of the present invention will be described with reference to the case of a television signal in which the high luminance component Yh is superimposed as the high definition information YH 'as shown in FIG. As shown in FIG.
In this television signal, in the region of the middle luminance component Ym,
The color signal C and the high definition information YH 'are multiplexed.

FIG. 1B shows a mode of signal multiplexing of field line pairs according to the present invention. In the present invention, the luminance mid-range component has one frame cycle, the color signal, and the high-definition information are two.
A field line pair is constructed with a frame cycle. That is, the luminance mid-range components are the scan lines A and B and the scan lines C and
By assigning the same signal components of Ym ₁ and Ym _{2 in} D, respectively, a field line pair having one frame as a cycle is constructed. On the other hand, for color signals and high-definition information, the same signal components C and YH 'are assigned to the scanning lines A, B, C, and D to form a field line pair with a period of two frames. It should be noted that the polarities of the color signals are inverted for each scanning line, as in the current television system. Further, the high-definition information is multiplexed in such a manner that its polarity is inverted for each field.

On the receiving side, these signal components can be completely separated by the arithmetic operation between scanning lines A, B, C and D described below.

Regarding the middle luminance component, the scanning lines A, B,
And (A + B) / 2 between scan lines C and D, and (C +
By performing the operation D) / 2, the components Ym ₁ and Ym ₂ can be completely separated and extracted.

Regarding the color signal, the scanning lines A, B,
By performing an arithmetic operation of (A-B-C + D) / 4 on the C and D signals, the components of the color signal C can be completely separated and extracted.

For high-definition information, scanning lines A,
The YH 'component can be completely separated and extracted by the operation of (A-B + C-D) / 4 for the B, C and D signals.

As described above, according to the present invention, a complete separation / extraction process without crosstalk can be realized by a calculation operation between scanning lines on the receiving side. Also, since the middle luminance component forms a field line pair with one frame as a cycle, deterioration of resolution characteristics in the time direction is small, and an image can be reproduced in a form more consistent with visual characteristics.

[0015]

FIG. 2 shows the overall block configuration of the first embodiment of the present invention. In the present embodiment, a television signal is formed by superimposing a luminance high-frequency component as high-definition information in the form shown in FIG. 1 on an image signal sequence obtained by interlaced scanning in the same form as the current television system. It is a thing.

The image signal series V _I of the three primary colors R, G, B obtained by scanning in the same format as the current television system in the interlaced scanning image pickup circuit 1 is a YIQ conversion circuit 2.
In step 1, a predetermined matrix calculation operation is performed to convert into a signal series of luminance signal Y and color difference signals I and Q.

Luminance component field line pair generation circuit 3
Then, as shown in FIG. 1B, the signal component Y1 assigned to the luminance mid-range component of the field line pair having a period of 1 frame and the signal component assigned to the high-definition information of the field line pair having a period of 2 frames. Generate component Y2. In addition, the color component field line pair generation circuit 6
Then, for the color difference signals I and Q, signal components I _P and Q _P to be assigned to the color signal C of the field line pair having a cycle of two frames are generated.

The luminance signal whose delay is adjusted by the delay circuit 11 is L
The PF circuit 12 extracts a component of 2 MHz or less to generate a luminance low band component YL. Further, in the BPF circuit 4, 2 of Y1
The component of .about.4.2 MHz is extracted to generate the middle luminance component Ym of the field line pair. In the HPF circuit 5, Y2
The above-mentioned component of 4.2 MHz or higher is extracted to generate the high luminance component Yh of the field line pair. Then, in the frequency shift circuit 9, the subcarrier μ ₀ (for example, 1 of the color subcarrier f _SC
(6/7 times), carrier suppression amplitude modulation is performed, and the lower sideband component is extracted to generate high-definition information YH '. It should be noted that the subcarrier μ ₀ is phase-inverted for each field so that the polarity of the high-definition information is inverted for each field as shown in FIG. 1B.

On the other hand, in the LPF circuits 7 and 8, the signals Q _P and I _P
Components of 0.5 MHz or less and 1.5 MHz or less are extracted, and the color modulation circuit 10 performs a quadrature modulation operation by the color subcarrier f _SC to generate the color signal C of the field line pair.

In the adder circuit 13, the signals YL, Ym, Y
H'and C are added, and the process circuit 14 adds a synchronization signal, a burst signal, phase information of the subcarrier μ ₀ , and the like,
A television signal having the signal spectrum shown in FIG. 1A is generated.

Next, an embodiment of the luminance component field line pair generating circuit 3 will be described with reference to FIG. In the present embodiment, the signal components of the field line pair to be assigned to the middle luminance component are assigned to the scanning line A and B shown in FIG. The signal components of the pair are scanned lines A, B,
It is generated by the average value of the C and D signals.

The luminance signal Y and the signal delayed by the 263 line delay circuit 15 for the 263 scanning line period are weighted with a coefficient value of 1/2 by the coefficient weighting circuit 16 and added by the adding circuit 17, and the scanning line is added. A signal a corresponding to the average value of the A and B signals is generated. Then, the switch circuit 18 alternately selects the signal B and the signal B delayed by the 263 line delay circuit 15 for each field period, and the scanning lines A and B or the scanning lines C and D have the same signal component. Generate a signal sequence.

This signal series and the signal series delayed by 525 line delay circuit 19 for 525 scanning line periods (corresponding to one frame period) are weighted with a coefficient value of 1/2 by a coefficient weighting circuit 16, and an addition circuit is added. The two are added at 17 to generate a signal α corresponding to the average value of the signals of the scanning lines A, B, C and D. Then, the switch circuit 20 alternately selects the signal α and the signal β of the 525 line delay circuit 19 for each frame cycle, and the scanning lines A, B, C, and D have the same signal component and a high-definition field line pair. A signal Y2 to be assigned to information is generated.

The output signal of the 525 line delay circuit 19 is a signal Y1 which is the same signal component of the scanning lines A and B or the scanning lines C and D and is assigned to the middle luminance component of the field line pair.

Next, an embodiment of the color component field line pair generation circuit 6 is shown in FIG. In this embodiment, the signal component assigned to the color signal of the field line pair is generated by the average value of the signals of the scanning lines A, B, C and D, and is realized in the same form as the signal Y2 shown in FIG.

Due to the combination of the 263 line delay circuit 15, the coefficient weighting circuit 16, the adder circuit 17 and the switch circuit 18, the signal components of the scanning lines A and B and the scanning lines C and D are averaged between the respective scanning lines. Generate a signal sequence that serves as a value. The combination of the 525 line delay circuit 19, the coefficient weighting circuit 16, the addition circuit 17, and the switch circuit 20 causes the signal I _P to be assigned to the color signal of the field line pair with the same signal components on the scanning lines A, B, C, and D. ,
Or generate Q _P.

As described above, according to the first embodiment of the present invention, the time resolution characteristic of the middle luminance component is not impaired, and
On the receiving side, it is possible to generate a television signal capable of completely separating and extracting the multiplexed signal.

Next, a second embodiment of the present invention will be described with reference to FIG. In this embodiment, the television signal is generated from the image signal sequence of the image pickup system of the progressive scanning mode, so that the vertical resolution characteristic can be improved as compared with the current television system.

The image signal series V _P of the three primary colors R, G, B obtained from the progressive scanning image pickup circuit 21 in the form of progressive scanning at 525 scanning lines and 60 frames / sec, for example, is inputted to the scan conversion circuit 22. , An interlaced scanning conversion is performed to generate an image signal sequence V _I in the form of interlaced scanning.

The same signal processing as in the first embodiment is applied to this image signal series V _I to generate the television signal V _S of the form shown in FIG.

FIG. 6 shows the operation of sequential-interlaced scan conversion by the scanning line thinning operation in this embodiment. In this scan conversion, a scanning line image signal series for every two scanning line periods is extracted by performing a 2: 1 scanning line thinning operation on the progressive scanning image signal series, and a time axis double expansion operation is performed. , Generate an image signal sequence for interlaced scanning.

FIG. 7 shows a scan conversion circuit 2 which realizes this function.
2 is an example. The progressive scanning image signal is input to the aliasing distortion removing filter 23, and a signal V _PP from which the aliasing distortion component is removed by interlaced scanning is generated. This aliasing distortion removal filter can be realized by a vertical or time / vertical two-dimensional filter.

The scanning line thinning-out operation is performed by writing to the memory constituted by the memory circuit 24 and the memory control circuit 25 (hereinafter referred to as W
It is realized by controlling the T operation and the read (hereinafter abbreviated as RD operation) operation.

In the memory circuit 24, the signal component (1, 3 in FIG. 3) corresponding to the scanning line of the signal V _PP for every two scanning line periods.
..) are written by the WT operation. On the other hand, the reading from the memory circuit 24 is performed by the interlace scanning system 1 by the operation speed of 1/2 of the WT operation.
RD operation with a period of the scanning line period is performed to
A signal sequence V _I for interlaced scanning that has been double-expanded is generated. The memory control circuit 25 generates control signals necessary for WT and RD operations.

In this scan conversion, it is desirable that the aliasing distortion removing filter removes the aliasing distortion component in the interlaced scanning, but it is not always necessary.
In some cases, this may be omitted.

As described above, according to the second embodiment, it is possible to generate a television signal having a vertical resolution characteristic superior to that of the current television system.

The scan conversion from the progressive scan to the interlaced scan can be realized in a form different from the scan line thinning operation according to the second embodiment. FIG. 8 shows the sequential-interlaced scan by the frame completion scan conversion. Indicates conversion. This generates an interlaced scanning image signal by rearranging the image signals of one frame of progressive scanning.
That is, the image signal of the odd-numbered scanning line of one frame of the sequential scanning is the image signal of the scanning line of the first field of the interlaced scanning, and the image signal of the scanning line of the even number is the scanning of the second field of the interlaced scanning. Sequential to interlaced scan conversion is realized by generating the line image signal.

FIG. 9 shows a third embodiment of the present invention in which the sequential to interlaced scan conversion is performed by this frame completion scan conversion. That is, the progressive scan imaging circuit 21
For the progressive scanning image signal series V _P of the three primary colors R, G, B obtained by the frame completion scanning conversion circuit 26 shown in FIG.
An image signal series V _I in the form of interlaced scanning is generated by rearranging the image signals of one frame as shown in FIG.

The same signal processing as in the first embodiment is performed on this image signal series to generate a television signal as shown in FIG.

An embodiment of the frame completion scan conversion circuit 26 used in this embodiment is shown in FIG. Memory circuit 27
The image signal series of one frame for every two frames is written into the frame by the WT operation of the progressive scanning system with a cycle of two frames. On the other hand, the RD operation is performed at a speed half that of the WT operation, with one frame of the interlaced scanning system as a cycle. Then, the signal series corresponding to the odd-numbered scanning lines is read in the period of the first field, and the signal series corresponding to the even-numbered scanning lines is read in the period of the second field to obtain the image signal series V _I of the interlaced scanning. To generate.

In the memory control circuit 28, these WT, R
The control signal necessary for the D operation is generated.

As described above, according to the third embodiment, it is possible to generate a television signal having an excellent vertical resolution characteristic as compared with the current television system. Further, when performing scan conversion from interlace to sequential on the receiving side, scan conversion can be realized without performing motion adaptive signal processing by rearrangement processing of interlaced scanning signal series and frame interpolation processing. ..

The present invention can also be applied to an HDTV image signal sequence, and a fourth embodiment corresponding to this is shown in FIG. The image signal series V _H of the three primary colors R, G, B having 1125 scanning lines, which is obtained from the HDTV image pickup circuit 29, is inputted to the down conversion circuit 30. In the down-convert circuit 30, the number of scanning lines from 1125 to 5
Scanning line number conversion processing to 25 lines and aspect ratio 1
An image signal series V _I for interlaced scanning similar to that of the current television system is generated by conversion processing from 6: 9 to 4: 3 or the like. Signal processing similar to that of the first embodiment is performed on this signal series V _I to generate a television signal of the form shown in FIG. In some cases, the down converter circuit 30 can be realized in a form in which the aspect ratio conversion process is omitted.

As described above in the first to fourth embodiments,
According to the present invention, it is possible to completely separate multiple signals on the receiving side,
In addition, it is possible to generate a television signal with excellent resolution characteristics.

In this embodiment, as the high-definition information, the high-frequency component of the luminance signal shifted to the low frequency band by the frequency shift has been described as an example, but the high-definition information is not limited to this. It is possible to use various significant information such as a high frequency component of a signal or an auxiliary signal for widening a screen for high definition information.

[0046]

As described above, according to the present invention, it is possible to completely separate and extract a multiple signal without crosstalk on the receiving side, and it is possible to generate a television signal having excellent resolution characteristics. It is effective for high image quality and high definition.

The television signal according to the present invention is
It can also be applied to the side panel technique, the letterbox technique, the intermediate mode technique, the portrait mode technique, etc., which realizes widening of the screen.

[Brief description of drawings]

FIG. 1 is an explanatory view of the principle of the present invention.

FIG. 2 is an overall block configuration diagram of a first embodiment of the present invention.

FIG. 3 is a diagram showing an embodiment of a luminance component field line pair generation circuit.

FIG. 4 is a diagram showing an embodiment of a color component field line pair generation circuit.

FIG. 5 is an overall block configuration diagram of a second embodiment of the present invention.

FIG. 6 is an operation explanatory diagram of scan conversion by a scan line thinning operation.

FIG. 7 is a diagram showing an embodiment of a scan conversion circuit.

FIG. 8 is an operation explanatory diagram of frame completion scan conversion.

FIG. 9 is an overall block configuration diagram of a third embodiment of the present invention.

FIG. 10 is a diagram showing an embodiment of a frame completion scan conversion circuit.

FIG. 11 is an overall block configuration diagram of a fourth embodiment of the present invention.

[Explanation of symbols]

1 ... Interlaced scanning image pickup circuit, 2 ... YIQ conversion circuit,
3 ... Luminance component field line pair generation circuit, 4 ... BP
F circuit, 5 ... HPF circuit, 6 ... Color component field line pair generation circuit, 7 ... LPF circuit, 8 ... LPF circuit, 9 ...
Frequency shift circuit, 10 ... Color modulation circuit, 11 ... Delay circuit, 12 ... LPF circuit, 13 ... Addition circuit, 14 ... Process circuit, 15 ... 263 line delay circuit, 16 ... Coefficient weighting circuit, 17 ... Addition circuit, 18 ... Switch circuit, 19 ... 5
25 line delay circuit, 20 ... Switch circuit, 21 ... Sequential scanning imaging circuit, 22 ... Scan conversion circuit, 23 ... Folding distortion eliminating filter, 24 ... Memory circuit, 25 ... Memory control circuit, 26 ... Frame completion scan conversion circuit, 27 ... memory circuit, 28 ... memory control circuit, 29 ... HDTV image pickup circuit,
30 ... Down conversion circuit.

Claims (5)

[Claims] 1. A means for frequency-multiplexing a color signal and high-definition information to a luminance signal middle frequency component of an interlaced scanning image signal, the luminance signal middle frequency component being a field line pair and a color whose cycle is one frame. A signal and high-definition information are composed of a signal component of a field line pair having a cycle of two frames. 2. The television according to claim 1, wherein the high-definition information is a luminance signal high frequency component converted to a low frequency component by a frequency shift operation, a color difference signal high frequency component, or a combination of both. John signal construction method. 3. The structure of a television signal according to claim 1, wherein the interlaced scanning image signal is generated by sequential to interlaced scanning conversion by scanning line thinning operation of the progressive scanning image signal. Method. 4. The television signal according to claim 1, wherein the interlaced scanning image signal is generated by sequential to interlaced scanning conversion by a frame completion scanning conversion operation of the progressive scanning image signal. How to configure. 5. An interlaced scanning image signal is an HDTV.
4. The method for constructing a television signal according to claim 1, wherein the television signal is generated by a down conversion operation of the image signal.