JPH03154594A - Transmission system for television signal and receiver - Google Patents

Abstract

PURPOSE:To avoid crosstalk between a luminance signal and a chrominance signal while keeping the compatibility with a current television system by sending separately a composite transmission signal resulting from frequency multiplex of a luminance signal and a color signal in parallel with the luminance signal or the color signal. CONSTITUTION:A luminance signal Y and a chrominance signal C are subject to frequency multiplex as conventionally to form a main signal (Y+C) and a signal (alphaY+betaC) [alpha, beta are an optional coefficients with a relation of (alphanot equal to beta)] is used as an auxiliary signal H, which is sent in parallel with the main signal. A receiver reproduces the color signal from the auxiliary signal and the color signal C is subtracted from the main signal (Y+C) to reproduce the luminance signal Y. Thus, the luminance signal Y and the chrominance signal C are separated independently of a moving picture and a still picture and crosstalk between the luminance signal Y and the chrominance signal C and the reduction in the resolution attended with the YC separation are prevented while keeping compatibility with the current television system.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a television signal transmission system and a receiver, and particularly to crosstalk between a luminance signal and a color signal,
The present invention relates to a television signal transmission system and a receiver that do not reduce resolution due to separation of luminance signals and color signals.

[Conventional technology]

In the current television system (NTSC system), brightness signals and color signals are frequency-multiplexed and transmitted.

Figure 5 shows the configuration diagram of the transmitting side of the current television system.
Shown in a simplified manner. First, red, green, and blue signals (hereinafter abbreviated as R, G, and B signals) from the camera 1 are converted into a luminance signal Y using the matrix circuit 2.

Broadband color signal converter converts to narrowband color signal Q. Color signal I
and Q are generated by the C signal generation circuit 100 in predetermined horizontal frequency bands (1, 5M, Hz and 0.5MHz).
) and then performs orthogonal modulation using a single color subcarrier fsc to produce a C signal. The adder 9 is used to add the Y signal and the C signal, the filter 10 is used to limit the band to 4.2 MHz, and the multiplier 16 is used to modulate the signal with an RF carrier wave to obtain a transmission signal.

(Reference: "Broadcasting Technology Book, Color Television"
, Chapter 3 1 edited by Japan Broadcasting Corporation, June 1963).

FIG. 6 shows the frequency spectrum of a conventional television transmission signal. The horizontal axis in FIG. 12A represents horizontal frequency and the vertical axis represents level, and the horizontal axis in FIG. 6B represents temporal frequency and the vertical axis represents vertical frequency. As shown in (a) and (b) of the figure, the luminance signal Y and the color signal C (=I+Q) are frequency multiplexed.

FIG. 7 shows a configuration diagram of a conventional television receiver.
After the transmission signal is demodulated by the RF demodulation circuit 2o, the YC
A separation circuit 104 is used to separate the luminance signal Y and the color signal C. The YC separation circuit 104 is a band pass filter (BPF).
), a two-dimensional filter using calculations between scanning lines within the same field, a three-dimensional filter using calculations between fields or frames, etc. This figure shows the case of a three-dimensional filter using a motion detection circuit 30 and a motion adaptive YC separation circuit 31. This YC separation characteristic will be described later. The separated C signal is further separated into an engineering signal and a Q signal by an orthogonal demodulation circuit 27. The matrix circuit 28 converts the Y, I, and Q signals into R, G, and B signals, and the monitor 2
Enter 9.

FIG. 8 shows the YC separation characteristics of the three-dimensional YC separation circuit 104 shown in FIG. Figure (a) shows Y in still image mode.
The C separation characteristics are shown on the time-vertical frequency plane. In the case of a still image, the luminance signal Y is distributed around the origin, and the color signal C is distributed around the color subcarrier fsc without spread in the time-frequency direction. For this reason, a temporal filter (for example, 1
By using the frame sum and one frame difference), the luminance signal Y and the color signal C can be completely separated. FIG. 6B shows the YC separation characteristics in the moving image mode on a time-vertical frequency plane.

In the case of a moving image, generally both the luminance signal Y and the color signal C spread in the time direction. For this reason, a vertical filter (for example,
The luminance signal Y and the color signal C are separated using the sum of one line and the difference of one line within the same field. As shown in FIG. 7 above, the motion detection circuit 30 detects motion from the transmitted signal to create a parameter k, and the motion adaptive YC separation circuit 31 selects a still image mode according to the parameter k. (References: Baka Hirano, "Characteristics of EDTV encoders using current interlaced scanning camera signals", Journal of the Society of Television Engineers, Vo Q 43 r Nα5 (1989), pp.
505-512).

[Problem to be solved by the invention]

There is a limit to the yc (luminance signal-chrominance signal) separation characteristics achieved by frequency separation. For example, in the case of a one-dimensional filter using BPF, a luminance signal with a high horizontal frequency (such as vertical stripes) is regarded as a color signal, and crosstalk occurs. In the case of a two-dimensional filter that performs calculations between scanning lines, a luminance signal (referred to as a semi-diagonal component) having high horizontal and vertical frequencies becomes a crosstalk component.

Even with three-dimensional YC separation, which has the best YC separation characteristics, perfect YC separation characteristics can be obtained for still images, but crosstalk similar to a two-dimensional filter occurs for moving images. In other words, the luminance signal Y that protrudes from the dot part shown in Figure 8(b) is processed as the color signal C, resulting in a rainbow-colored disturbance called cross color, and conversely, the luminance signal Y that protrudes from the dot part in the figure is processed as a color signal C. Since the signal C is processed as a luminance signal Y, it becomes a spot-like disturbance called a hanging dot. Also, if motion detection is performed using only the receiver,
Crosstalk components occur when motion is incorrectly detected.

Furthermore, the part where the luminance signal Y and the color signal C overlap (the same figure (
The shaded area in b) is essentially impossible to separate.

In addition to crosstalk, resolution degradation is another issue. For example, in the case of a one-dimensional filter, the horizontal high frequency component of the luminance signal is not reproduced as a luminance signal, so the horizontal resolution is reduced. In the case of a two-dimensional filter, the semi-diagonal component of the luminance signal is not reproduced, resulting in a decrease in diagonal resolution.

In the case of a motion-adaptive three-dimensional filter, there is a reduction in resolution in video mode similar to that of a two-dimensional filter, and the difference in resolution between a still image and a video may appear unnatural.

Furthermore, even when the transmission side removes crosstalk components (brief filter processing) and transmits the image, the resolution of the reproduced image decreases.

In order to prevent the above-mentioned crosstalk and resolution reduction, if component transmission (or time axis multiplexing) is performed without frequency multiplexing the luminance signal and color signal, it will not be compatible with current television systems, so current TV receivers In this case, color images cannot be played back.

Therefore, an object of the present invention is to provide a television signal transmission system that is compatible with current television systems, eliminates crosstalk between luminance signals and color signals, and eliminates resolution degradation for both moving images and still images. and to provide receivers.

[Means to solve the problem]

The above object is achieved by separately transmitting a composite transmission signal obtained by frequency multiplexing a luminance signal and a chrominance signal, and the luminance signal or the chrominance signal in parallel.

[Effect]

First, in order to maintain compatibility with conventional television systems, i
The color signal Y and the color signal C are frequency-multiplexed as before to form a main signal (Y+C). At the same time, the color signal C is transmitted as an auxiliary signal H in parallel with the main signal. The receiver reproduces the color signal C from the auxiliary signal H, and reproduces the main signal (y
), the luminance signal Y is reproduced by subtracting this color signal C from the chrominance signal C. Therefore, regardless of whether the image is a moving image or a still image, the luminance signal Y and color signal C can be completely separated, and the above object can be achieved. Also, as the auxiliary signal H, instead of the color signal C, the signal (αY+βC) [where α and β are (α≠β
Even if an arbitrary coefficient of ) is transmitted, the receiving side can completely separate the luminance signal Y and the color signal C, and the same effect can be obtained.

The methods of transmitting the auxiliary signal H include: ■ Using a channel different from the main signal; ■ Using a horizontal/vertical overscan area or cutting off a part of the screen (image by the main signal) to create an auxiliary signal transmission area. Possible ways to use this method include time axis multiplexing, and (2) a method using RF orthogonal modulation.

〔Example〕

Hereinafter, the present invention will be explained in detail using the drawings.

FIG. 1 shows a configuration diagram of an embodiment of the transmitting side of the present invention.

Here, a case will be described in which the main signal and the auxiliary signal are time-domain multiplexed.

R, G, and B signals from the camera 1 are converted into a luminance signal Y, color signal signal, and Q by a matrix circuit 2. Filters 3 and 4 are used to convert the color signal into a predetermined horizontal frequency band (
1.5 MHz and 0.5 MHz), and then orthogonally modulated using a color subcarrier fsc by an orthogonal modulation circuit 101 to obtain a C signal.

The orthogonal modulation circuit 101 includes a phase shifter 62, multipliers 5 and 7,
It is composed of an adder 8. After adding the Y signal and the C signal using an adder 9, a predetermined band limit is applied using a filter 10.
Create the main signal (y+c).

Up to this point, the configuration is the same as the conventional example shown in FIG.

Separately from the main signal, the C signal is converted into an auxiliary signal H using a compression circuit 11, a frequency shift circuit 12, and a space shift circuit 13, which will be described later. A switch 14 is controlled by a signal generated by a control circuit 15 based on the synchronization signal to switch between a main signal and an auxiliary signal, and a multiplier 16 modulates the signal with an RF carrier wave to produce a transmission signal.

If the auxiliary signal can be transmitted using a separate channel,
There is little need to compress or frequency/spatial shift the auxiliary signal H. However, when transmitting the main signal and auxiliary signal in one channel, the transmission capacity is limited.
It is necessary to convert the signal into a signal format suitable for transmission.

A case where a part of the screen (display area) is removed and used as an auxiliary signal transmission area will be described with reference to FIG. The aspect ratio of the display area of the screen in the current system (the ratio of the width to the height of the screen) is 4:3. Mask the top and bottom of this display area with a black tint, and change the aspect ratio of the display area to, for example, 16:
9 (this method is called the letterbox method or the upper and lower mask method and is well known). The main signal (Y+C) is arranged on the main panel at the center of the screen, and the auxiliary signal H is multiplexed inconspicuously on the upper panel 18 and lower panel 19 at the top and bottom of the screen. When the aspect ratio of the main panel is 16:9, the total area of the upper and lower panels 18 and 19 is 1/3 of the area of the main panel, so
The upper and lower panels have only 1/3 the transmission capacity of the main panel.

As shown in FIG. 6(a) above, the color signal C (=I+Q
) are multiplexed, so horizontally 2.1~4,2M
This is the Hz band. This C signal is compressed to 1/3 by the compression circuit 11 and frequency shift circuit 12 shown in FIG. 1 so that it becomes equal to the transmission capacity of the upper and lower panels. The signal is moved to that part and becomes the auxiliary signal H.

FIG. 3 shows an example of a signal format when the auxiliary signal H is multiplexed on the upper and lower panels. Originally horizontal 2.1~4.2MH
Compress the color signal C of z to 172 in the horizontal direction,
Frequency shift from 0 to 4,2 MHz. This signal is further compressed by 2/3 in the vertical direction, resulting in a total compression of 1/3. At this time, if the auxiliary signal H (=I'+Q') is shown in the time-vertical frequency plane, it will be as shown in FIG. 3(b), for example. The time-vertical frequency of the modulated carrier fsc' of the auxiliary signal H is converted to the color subcarrier f
By selecting the same value as sc, the polarity is reversed between lines and frames, making it less noticeable. The method of compressing the auxiliary signal H to 1/3 of the total is not limited to the above method, and various other modifications can be considered, including horizontal and vertical 2-time compression and frequency band limiting methods. It will be done.

FIG. 4 shows a configuration diagram of an embodiment of the receiving side of the present invention.

The transmission signal is demodulated by the RF demodulation circuit 20, and the main signal (Y+C) and the auxiliary signal H are separated by the switch 21. Here, the switch 21 is controlled by a signal generated by a control circuit 22 based on a synchronization signal. Auxiliary signal H
is the opposite process to that on the transmitting side, that is, the spatial shift circuit 23
1 frequency shift circuit 24 and expansion circuit 25 to reproduce C signals and V signals. By subtracting the reproduced C signal from the main signal (y+c) using the subtraction circuit 26, the luminance signal Y is reproduced. Further, the orthogonal demodulation circuit 27 is used to reproduce the C signal and the C signal. The Y, I, and C signals are converted into R, G, and B signals by the matrix circuit 28 and then input to the monitor 29 .

FIG. 9 shows a configuration diagram of a modified example of an embodiment of the receiving side of the present invention. Here, the frequency band of the auxiliary signal H is limited with respect to the C signal multiplexed with the main signal. An example of the configuration of the receiving side in this case will be explained. For example, auxiliary signal H
As, both I and C signals (0=0, 5 MHz
), or when transmitting with vertical and time-frequency band limitations. The present invention is applied to the band in which the color signal C is transmitted as the auxiliary signal H, and YC separation by conventional frequency division is used for the other bands. In the figure, a separation circuit 103 having the same configuration as that shown in FIG. 4 performs RF demodulation on the transmission signal and separates it into a main signal (y+c) and an auxiliary signal H. The C signal is reproduced by processing, and the Y signal is created by subtracting it from the main signal (y+c). When the frequency band of the auxiliary signal H is limited, crosstalk remains in the reproduced Y signal, and the C signal reproduced from the auxiliary signal H lacks a band. By using the filter 34 and the filter 35, the Y signal and the C signal in the frequency band without crosstalk are
Pass through each signal. On the other hand, for the main signal (Y+C), the luminance signal Y
The color signal C is separated from the color signal C. The filters 34 and 3
Filters 32 and 3 each have complementary characteristics to 5.
After band-limiting the output of the conventional yc separation circuit 104 using 3, the Y signal and the C signal are added to each other using adders 36 and 37, respectively. The C signal is demodulated into an R, G, and C signal using an orthogonal demodulation circuit 27, and is then demodulated into R, G, and C signals by a matrix circuit 28 along with a Y signal.
It is converted into a B signal and input to the monitor 29.

Another multiplex transmission method for auxiliary signals will be explained. The main signal (y+c) is vestigial sideband modulation (VS) as in the current system.
B) Therefore, a double-sided band portion exists near the RF carrier. The color signal signal and Q are multiplexed to form an auxiliary signal H. The auxiliary signal H is subjected to RF orthogonal modulation using a carrier wave (orthogonal carrier wave) that is 90'' different in phase from the RF carrier wave of the main signal (Y+C), and multiplexed onto both side band portions of the main signal (y+c).

FIG. 10 shows an example of a frequency spectrum of a transmission signal. In the same figure, one color signal and Q are frequency multiplexed.
An auxiliary signal H consisting of ' and Q' multiplied signals is RF orthogonally modulated and multiplexed with the main signal.

The spectral distribution of the auxiliary signal H is not limited to this, and may be modified, for example, by exchanging the positions of Q' and Q'.

FIG. 11 shows another example of the frequency spectrum of the transmission signal. In the figure, color signals I and Q are time-axis multiplexed, for example, line-sequentially and field-sequentially, to obtain an auxiliary signal H consisting of the multiplied signals H' and Q', which is RF orthogonally modulated and multiplexed with the main signal.

However, in the method shown in FIG. 11 above.

Rather than time axis multiplexing,
z), and C signal (e.g. O~0, 5 MHz
) is orthogonally modulated by a subcarrier (e.g. 3.58 MHz), and a signal (e.g. 2.1 to 5 MHz, 1 MHz) is down-converted to direct current (e.g. -1, 5 MHz to 1 MHz).
．． 5M, Hz) It is possible to simply replace the above ``signal'', but it is not possible in practice.In other words, the main signal and C signal are orthogonally multiplexed as an auxiliary signal using the same RF carrier wave. Furthermore, it is impossible to orthogonally multiplex the main signal and the auxiliary signal, and the receiving side has three signals (
Engineering signal, Q signal.

main signal) cannot be separated.

FIG. 12 shows an example of a frequency spectrum of a transmission signal that solves this problem. In the figure, color signals I and Q
is orthogonally modulated by the subcarrier fsc'' to produce
The auxiliary signal H, which is a doubled signal, is further RF orthogonally modulated and multiplexed with the main signal.

FIG. 13 shows an example of the configuration of the transmitting side of the present invention for creating the transmission signal shown in FIG. 10 above.

A matrix circuit 2 converts R, G, and B signals from a camera 1 into Y, I, and C signals. A C signal is created from the C signal and the C signal using a C signal creation circuit 100 having the same configuration as that shown in FIG. Using adder 9,
The Y signal and the C signal are added and limited to a predetermined horizontal band using a filter 10 to obtain a main signal (Y+C). Also,
The main signal and the main signal, which have been subjected to a predetermined band limit, are passed through compression circuits 38 and 39, respectively, and after a frequency shift circuit 40 prevents the frequency bands of the C signal and the main signal from overlapping, an adder 41 is used to auxiliary signal. Let the signal be H. The main signal (y+c) is modulated with an RF carrier using a multiplier 42,
The auxiliary signal H is modulated by the multiplier 43 with an RF carrier wave whose phase has been rotated by 90 degrees by the phase shifter 43. Both signals are added by an adder 45 to form a transmission signal. In addition, by appropriately changing the configuration of the multiplex circuit 105 shown in the figure,
The transmission signals shown in FIGS. 11 and 12 above can be easily created. Although omitted in Fig. 13, in order to compensate for the frequency characteristics of the Nyquist filter normally provided in the IF stage of the receiver, after performing inverse Nyquist filter processing on the auxiliary signal H, the main signal It may be multiplexed with

In FIG. 14, corresponding to the sending side shown in FIG. 13 above,
An example of the configuration of the receiving side of the present invention is shown. In the same figure, first 1
The separation circuit 106 performs the inverse processing of the multiplex circuit 105 shown in FIG. 13, and separates and reproduces the main signal (y+c) and the color signals (2) and (Q). The separation circuit 106 includes an RF quadrature demodulation circuit 46, a frequency separation circuit 472, a frequency shift circuit 48, and expansion circuits 49 and 50.

The separated and reproduced signal and C signal are once made into a C signal using an orthogonal modulation circuit 101 having the same configuration as that shown in FIG. , and reproduce the Y signal. Regenerated Y, I
, C signals are converted into R, G, and B signals by a matrix circuit 28 and input to a monitor 29. Here, as in the case shown in FIG. 9, the frequency band of the auxiliary signal H is limited with respect to the C signal multiplexed with the main signal.

The present invention can be applied to the band in which the color signal C is transmitted as an auxiliary signal, and YC separation by conventional frequency division can be used for other bands.

In the above description, a case has been described in which the color signal C is transmitted as the auxiliary signal H, but the same effect can be obtained even if the luminance signal Y is transmitted as the auxiliary signal H.

FIG. 15 shows a configuration diagram of still another embodiment of the transmitting side of the present invention. Here, in order to remove the crosstalk between the luminance signal and the color signal on the current receiver, we will introduce the present invention in contrast to the transmission method in which the crosstalk component is subjected to brisfilter processing on the transmitting side. A case in which this is applied will be explained. In the same figure, R, G, and B signals from camera 1 are
The matrix circuit 2 converts it into Y, I, and Q signals. ■
After the C signal generation circuit 100 converts the C signal and the Q signal into a C signal, a filter 52 is used to remove components that cause crosstalk on current receivers.

This filter 52 has the following characteristics in horizontal-vertical-time frequency (μm sea f) space: (U, sea, f) = rOMHz, 0
It is a horizontal (one-dimensional), horizontal/vertical (two-dimensional), or horizontal/vertical/temporal (three-dimensional) filter whose zero point is cph, 0 Hz). On the other hand, for the Y signal as well, a filter 51 is used to remove components that cause crosstalk on current receivers. This filter 51 has a function of (μ
,V,'! >= (3,58MHz, 525/4cp
, h, 15 Hz) is a horizontal (one-dimensional), horizontal/vertical (two-dimensional), or horizontal/vertical/temporal (three-dimensional) filter whose zero point is zero. The outputs of filters 51 and 52 are used as a main signal (y+c) using adder 9. If this continues, the resolution of the image reproduced by the receiver will decrease, so a subtracter 53 is used to calculate the difference between the input and output signals of the filter 51 to create and transmit the auxiliary signal H. The main signal (y+c) and the auxiliary signal H are multiplexed using a multiplexing circuit 102 having the same configuration as that shown in FIG. 1 to produce a transmission signal.

In FIG. 16, corresponding to the sending side shown in FIG. 15 above,
An example of the configuration of the receiving side of the present invention is shown. In the same figure, a separation circuit 10 having the same configuration as that shown in FIG.
3, after separating and reproducing the main signal (Y+C) and the auxiliary signal H, the main signal (y+c) is transferred to the conventional YC separation circuit 104.
The signal is separated into a luminance signal Y and a color signal C. The brightness signal Y and the auxiliary signal H are added using the adder 54 and inputted as a new brightness signal Y to the matrix circuit 28. On the other hand, the color signal C separated by one is further processed by the orthogonal demodulation circuit 27.
Separate into Q signal and power the matrix circuit 28 times. The R, G, and B signals output from the matrix circuit are sent to the monitor 29.
Enter.

FIG. 17 shows a configuration diagram of still another embodiment of the transmitting side of the present invention. This figure is almost the same as the configuration shown in FIG. 15 above, and the method of creating the main signal (Y+C) is the same, but the method of creating the auxiliary signal H is different. That is, in the figure, from the main signal (y+c) which is the output of the adder 9,
- YC separation circuit 104, which is the same as that used on the receiving side.
The Y signal is separated by A subtracter 55 creates a difference between this separated Y signal and the Y signal before input to the filter 51, and transmits this as an auxiliary signal H. When this transmission signal is received by a receiver having the configuration shown in FIG. 16, if the characteristics of the YC separation circuit 104 are the same for transmission and reception, the original luminance signal Y can be completely reproduced.

In addition to the above, various modifications are possible.

For example, by attaching an identification signal to the auxiliary signal and switching it with other signals (or by frequency multiplexing or time axis multiplexing)
The present invention may be applied only to the case of this auxiliary signal on the receiving side. Other signals include horizontal, to improve brightness and color resolution.

A vertical one-time frequency high frequency component, a [vertical ■-time T] component, etc. can be considered (see Japanese Patent Application No. 1-180322).

Furthermore, the same effect can be obtained by using (Y-C) as the auxiliary signal. In general, if the auxiliary signal is (αY + βC) [where α and β are arbitrary coefficients of (α≠β) and the receiving side performs appropriate calculations with the main signal (y + c), it will be completely equal to the Y signal and C
Can separate signals.

Further, even when the main signal is transmitted by multiplexing the color signal C with the number of waves of another signal by X, it can be easily applied by using the (C+X) signal instead of the C signal described above. For example, this is the case when a horizontal high frequency component of a luminance signal is also multiplexed onto a vertical high frequency component of a color signal (at a position conjugate to a color subcarrier in the time-vertical frequency plane).

Note that the present invention applies not only to the NTSC system but also to the PAL system.

It can be used in various composite signal format television systems such as SECAM, and is also suitable for use not only for transmitting television signals but also for recording television signals on VTRs, video discs, etc. It is.

[Effects of the invention] By applying the present invention, it is possible to create a television signal that is compatible with current television systems and that does not have crosstalk between luminance signals and chrominance signals or decrease in resolution due to YC separation. Since it is possible to realize a transmission method of

Furthermore, according to the present invention, since the separated luminance signal and color signal do not include crosstalk, by using these separated signals for motion detection, etc., detection sensitivity is improved and motion detection is reduced. can be done.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of an embodiment of the transmitting side of the present invention, FIGS. 2 and 3 are operation explanatory diagrams of an embodiment of the present invention, and FIG. 4 is a diagram of an embodiment of the receiving side of the present invention. 5 is a configuration diagram of the transmitting side of the conventional example, FIGS. 6 and 8 are explanatory diagrams of the operation of the conventional example, FIG. 7 is a configuration diagram of the receiving side of the conventional example, and FIG. 9 is the configuration of the present invention. Fig. 10 is a block diagram of another embodiment of the transmitting side of the present invention, Figs. 11 to 1
14 is a diagram illustrating the operation of another embodiment of the present invention, FIG. 14 is a block diagram of another embodiment of the receiving side of the present invention, FIG.
FIG. 7 is a block diagram of still another embodiment of the transmitting side of the present invention, the first
FIG. 6 is a block diagram of still another embodiment of the receiving side of the present invention. 1... Camera, 2, 28... Matrix circuit, 3,
4゜10.32, 34, 35, 51.52... Filter, 5.7, 16, 42.44... Multiplier, 6, 43
・Phase shifter, 8, 9, 36, 37, 41, 45.54...
・Adder, 11, 38.39... Compression circuit, 12゜2
4.40,48...Frequency shift circuit, 13°23.
...Space shift circuit, 14.21...Switcher, 1
5.22... Control circuit, 17... Main panel, 1
8...Top panel, 19...Bottom panel, 20...R
F demodulation circuit, 25, 49, 50... expansion circuit, 26° 53.55... subtraction circuit, 27... orthogonal demodulation circuit. 29...Monitor, 30...Motion detection circuit, 31...
- Motion adaptive YC separation circuit, 46...RF orthogonal demodulation circuit. 47... Frequency separation circuit, 100... C signal creation circuit, 101... Orthogonal modulation circuit, 102, 105...
Multiplex circuit, 103, 106... Separation circuit, 104...
・YC separation circuit. More 7 Fuzu (kuun (ν)

Claims (1)

[Claims] 1. Frequency multiplexing of signal A and signal B, main signal (A+B
), the signal (αA+βB) [where α, β are arbitrary coefficients of (α≠β)] is transmitted as an auxiliary signal H in parallel with the main signal. A television signal transmission method. 2. The television signal transmission system according to claim 1, wherein the signal A is a luminance signal and the signal B is a color signal. 3. In the television receiver used in the television signal transmission system according to claim 1, the signal A and the signal B are separated by calculating the main signal (A+B) and the auxiliary signal H. A television receiver characterized by: