JPH0350475B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for multiplexing and transmitting another signal onto a current television broadcast signal to provide a television signal processing method that enables rich television information services. It is.

Conventional technology Japan's current NTSC (National Television System Committee)
More than 25 years have passed since color television broadcasting using the ``System Committee'' system began in 1960. In the meantime, various new television systems have been proposed in response to demands for high-definition screens and improvements in the performance of television receivers. Furthermore, the content of the programs provided is changing from simple studio programs and relay programs to programs with higher quality and more realistic images, such as cinema-sized movie broadcasts.

Current broadcasting has specifications such as 525 scanning lines, 2:1 interlaced scanning, and 4.2 MHz horizontal luminance signal bandwidth and 4:3 aspect ratio (for example, Documents on Broadcasting Technology, Color Television Edited by Japan Broadcasting Corporation, Nippon Broadcasting Publishing) Association, 1961). Against this background, methods for configuring television signals have been proposed that are compatible with current broadcasting and improve horizontal resolution. How would you describe an example?

NTSC television signal at time frequency ₁
When illustrated on a two-dimensional plane with a vertical frequency of ₂ , the 16th
It will look like the figure. The color signal C exists in the second and fourth quadrants from the phase relationship of the color subcarrier Fsc. The high frequency component of the luminance signal is multiplexed into the vacant first and third quadrants, and the receiving side uses field calculations to separate the color signal and the multiplexed high frequency component to improve horizontal resolution. (Unexamined Japanese Patent Publication 1983)
(Refer to Publication No. 171387) Furthermore, as a method of transmitting independent small screens, a method of transmitting using a narrow transmission band has been proposed. (Refer to Japanese Unexamined Patent Publication No. 49-84727) Problems to be Solved by the Invention As mentioned above, in current television broadcasting, the signal band is limited by the standard, and a large amount of information is also added. It's not easy to do. For example, methods for improving horizontal resolution have been proposed, but problems remain in terms of compatibility with current television broadcasting and deterioration of demodulation characteristics of high-frequency components during moving images. In addition, the proposal to transmit small screens had practical problems, such as the transmission speed being too slow to send moving images. Also, these identifications are not considered.

From the perspective of effective use of radio wave resources, it is not possible to expand the transmission band unnecessarily to solve the problem.

The present invention has been made in view of these problems, and is a television signal that is compatible with the current television system and that enables multiplex transmission of a large amount of information within the band defined by the standard and a wide variety of services. The purpose is to provide a processing method.

Means for Solving the Problems In order to solve the above-mentioned problems, the television signal processing method of the present invention provides a method for processing a television signal in which a predetermined carrier wave is modulated in vestigial sideband amplitude by a television signal.
A carrier wave having the same frequency as the carrier wave and having a phase different by ±90 degrees is carrier-suppressing double-sided band amplitude modulation using a multiplexed signal different from the television signal, and is attenuated to half at the carrier frequency, so that the amplitude characteristics are symmetrical with respect to the carrier frequency. A digital control signal is multiplexed into a vestigial sideband using a Nyquist file having a Nyquist file, and a digital control signal is superimposed on a vertical retrace period of at least one of the television signal and the multiplexed signal, and the multiplexed signal supplements the television signal. The digital control signal is characterized in that the type is transmitted by the digital control signal.

Effect The present invention uses the method described above to generate a television signal that enables multiplex transmission of different information within the band of the current television broadcast standard. High-quality images, not only images, but also multiplexed information.
You can also get a wealth of services such as high-quality audio, wide aspect television, program supplementary screens (sign language, memos, etc.), and small-screen special news, and you can also enjoy conventional television broadcasting images with current television receivers. It can be received with almost no problems.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram illustrating a television signal processing method on the transmitting side according to an embodiment of the present invention. 1 is a vertical blanking period data superimposition circuit, 2
3 is a control signal generation circuit, 3 is a multiplex signal selection circuit, and 4 is a control signal generation circuit.
5 is a quadrature modulation circuit, 5 is a mode selection signal, 6 is a video high frequency auxiliary signal circuit, 7 is a wide aspect video auxiliary signal circuit, 8 is an audio multiplex signal circuit, 9 is a multiplex signal circuit for small screen television, 10 1 is a scramble processing circuit, 11 is a digital data multiplex signal circuit, 12 is a video signal selection circuit, and 13 is a normal video signal. 30 is a composite television signal;
43 is a wideband video signal, 54 is a wide aspect video signal, 61 is an additional audio signal, 62 is a small screen video signal, 63 is digital data for multiplexing, and 73 is a pay video signal.

First, the mode selection signal 5 determines which auxiliary signal is to be transmitted. In accordance with this, the control signal generating circuit 2 performs error detection and error correction encoding on the data indicating the mode, and converts the data into digital data to be transmitted. Vertical retrace period data superimposition circuit 1
Then, it is superimposed on a normal video signal selected by the video signal selection circuit 12 depending on the type of auxiliary signal, and is input to the video baseband signal input terminal of the orthogonal modulation circuit 4. Further, the multiplex signal selection circuit 3 selects a necessary multiplex signal according to the determined type of auxiliary signal and inputs it to the multiplex signal input terminal of the orthogonal modulation circuit 4. Needless to say, digital data can be superimposed on the vertical retrace period of the multiplexed signal if necessary. The two types of signals input to the orthogonal modulation circuit 4 are orthogonally modulated and output from the orthogonal modulation circuit 4 as a composite television signal. Each block will be explained below.

First, the orthogonal modulation circuit 4 shown in FIG. 1 will be explained. FIG. 2 is a spectrum diagram showing a method of modulating a television signal modulated by the orthogonal modulation circuit 4 of FIG. FIG. 2a is a spectral diagram of a television signal subjected to vestigial sideband amplitude modulation in the current television system. Here, video carrier wave P1
This shows the case where the lower sideband of is the residual sideband. FIG. 2b shows a multiplexed signal different from the television signal shown in FIG. and residual sideband amplitude modulation. FIG. 2c shows a signal in which the signal in FIG. 2b is multiplexed with the television signal in FIG. 2a, and becomes the television signal synthesized according to the present invention. The multiplexed signal is not limited to analog signals, but may also be digital signals. FIG. 3 is a block diagram showing details of the orthogonal modulation circuit 4 of FIG. 1. 21
is a video baseband signal input terminal, 22 is an amplitude modulator, 23 is a first filter, 24 is an oscillator, 25
26 is a phase shifter, 26 is a multiplexed signal input terminal, 27 is a modulator, 28 is a second filter, 29 is an adder, and 30 is a composite television signal output terminal. A carrier wave P1 obtained from an oscillator 24 is amplitude-modulated by an amplitude modulator 22 using a video baseband signal input from a video baseband signal input terminal 21. The obtained amplitude modulated wave is band-limited by a first filter 23 to form a residual sideband, and then added to an adder 29. The carrier wave P1 obtained from the oscillator 24 is phase-shifted by 90 degrees by the phase shifter 25, and a carrier wave P2 is obtained. The carrier wave P2 is amplitude modulated in both sidebands by the multiplexed signal inputted from the multiplexed signal input terminal 26, and the carrier wave is removed and amplitude modulated in both sidebands during the synchronization signal period. Note that the phase shift direction of the phase shifter 25 may be fixed, but
For example, the phase shift direction may be changed every horizontal scanning period. The modulated signal is band-limited by a second filter 28 and then added to an adder 29 . The output of adder 29 becomes a composite television signal.
That is, a multiplexed signal is superimposed and synthesized on a video baseband signal to form a television signal. Furthermore, the second
Due to the frequency characteristics of the filter 28, the multiplexed signal becomes a signal having a band as shown in FIG. 2b.

Next, the video high frequency auxiliary signal circuit 6 shown in FIG. 1 will be explained. FIG. 4 is a block diagram of the video high frequency auxiliary signal circuit 6 of FIG. 1. 41 is a low-pass filter (hereinafter referred to as
LPF) (approximately 4.2MHz), 42 is a bandpass filter (BPF) (approximately 4.2 to 5.2MHz), 43 is a wideband video signal, 44 is a normal video signal, 45 is a high-frequency video signal, and 46 is a frequency conversion circuit. be. A wideband video signal 43 created by a camera etc. is LPF 41
The normal video signal 44 is limited to the same band as the current television signal, and is selected by the video signal selection circuit 12 in FIG. Further, the signal band-limited by the BPF 42 is converted into a signal in a low frequency band of about 1 MHz by a frequency conversion circuit 46, and becomes a high frequency video signal 45, which is selected by the multiplex signal selection circuit 3 in FIG. In addition
It goes without saying that the higher frequency portion of the high frequency video signal, for example 5.2 to 6.2 MHz, can be frequency converted and multiplexed to 4.2 to 5.2 MHz before the BPF.

Next, the wide aspect video auxiliary signal circuit 7 shown in FIG. 1 will be explained. FIG. 5 is a block diagram of the wide aspect video auxiliary signal circuit 7 of FIG. 51 is a time axis video signal extraction circuit;
52 is a first time axis expansion circuit; 53 is a second time axis expansion circuit; 54 is a wide aspect video signal;
5 is a normal video signal, and 56 is a wide aspect auxiliary video signal. Wide aspect video signal 54
is a video signal of a screen with an aspect ratio of 5:3, which is longer than usual, and the horizontal frequency is the same as that of a normal television signal. (FIG. 6a) This signal is divided into a central portion with an aspect ratio of 4:3 (FIG. 6b) and portions on both sides thereof (FIG. 6c) by a time-axis video signal cutting circuit 51. The central portion is expanded by about 5/4 times to become a normal television signal in a first time axis expansion circuit 52, and becomes a normal video signal 55. This signal is selected by the video signal selection circuit 12 shown in FIG. Both side portions are expanded approximately four times by a second time axis expansion circuit 53 to form a wide aspect auxiliary video signal 56. Broadband signals are converted to narrowband signals and then transmitted. This signal is selected by the multiple signal selection circuit 3 shown in FIG. The widths on both sides of the screen do not need to be the same, and if necessary, the values can be sent as control data during the vertical retrace period.

Next, the audio multiplex signal circuit 8 shown in FIG. 1 will be explained. Here, digitally coded audio data will be explained. For example, approximately 44K audio
By sampling at Hz and performing linear quantization at 16 bits, it is possible to transmit high quality audio in the 1.25MHz band, including error correction codes.
If data compression methods such as ADPCM are used, high-quality audio from an even larger number of channels can be digitally transmitted, making stereo audio and multilingual audio broadcasting possible. That is, the audio multiplex signal circuit 8 is a circuit that performs format conversion so that digitally coded audio data is transmitted during the video signal period of the television signal. Further, format conversion in accordance with the small screen signal, which will be explained later, is also performed as necessary. The additional audio signal 61 shown in FIG. 1 is converted into a video signal period signal by the audio multiplex signal circuit 8, and is selected by the multiplex signal selection circuit 3 as required. It goes without saying that narrowband analog audio signals can be compressed on the time axis, frequency multiplexed, and sent over multiple channels. Furthermore, it goes without saying that the transmission capacity can be easily increased by superimposing not only the video signal period but also other than the synchronization signal period.

Next, the multiplex signal circuit 9 for small screen television shown in FIG. 1 will be explained. The small screen video signal 62 in FIG. 1 is a video signal with a band of 1.25 MHz. The multiplex signal circuit 9 for small screen television converts this signal into a signal synchronized with the normal video signal 13, and the converted signal is selected by the multiplex signal selection circuit as required. The band of the multiplexed signal is 1.25MHz, so if it has the same horizontal and vertical frequency as a normal video signal and the same resolution, the aspect ratio (1:3) of a television screen will be 4:3. screen can be transmitted. For example, if this is divided into three, three screens with an aspect ratio (1:3) can be used. It is also possible to allocate one screen of the screen to one audio transmission channel.

First, the amount of digital data transmitted will be explained. Bandwidth for multiplex signal transmission is approximately 1.25MHz
It is. During the horizontal retrace period of the television signal, it is better not to multiplex it to prevent interference with conventional receivers, so the usable period is approximately 50 μs. Therefore, the amount of data that can be transmitted is 125BIT per horizontal period.
However, considering the quality of the transmission path, it is necessary to perform error detection and correction, so approximately 80 BIT can be used in practice.
Considering that data common to multiplexed signals is sent during the vertical retrace period, data transmission of approximately 1.1 MBIT per second is possible.

Therefore, the amount of data that can be transmitted per second on one of the three screens is 80 BIT x 160 lines x 30.
384KBIT, but for example 44KHz sampling
If 8BITADPCM coding is performed, it is 352KBIT, which is enough to transmit one channel of audio.
It goes without saying that the audio signal and the small screen video signal can be switched by the multiplex signal selection circuit 3 as necessary.

Next, the scramble processing circuit 10 shown in FIG. 1 will be explained. FIG. 7 is a block diagram of the scramble processing circuit 10 of FIG. 1. 71 is a video scramble circuit, 72 is a descramble information generation circuit, 73 is a pay video signal, 74 is a scramble code, 75 is a descramble key code, 76 is a scrambled video signal, and 77 is descramble data. The pay video signal 73 is a normal video signal for charging for program content. This signal is used in a video scrambling circuit 71 to replace, for example, the position of the video on the screen in block units according to a scramble code 74 to make the screen meaningless and to generate a scrambled video signal 76. The descrambling information generating circuit 72 generates data for descrambling using a scrambling code 74 and a descrambling code 75, and uses the data as descrambling data 77. The scramble code 74 and the descramble code 75 are sent from, for example, a computer (not shown). Descrambling key codes are, for example, data about the codes of users who have subscribed to a paid contract, and because they can send a larger amount of information than before, it is possible to send key codes to individual users, change the form of the scramble over time, etc. Multiple scrambles are possible. At this time, if the program identification code is sent, processing such as automatic billing can be easily performed.

Next, the digital data multiplex signal circuit 1 shown in FIG.
1 will be explained. Since the data transmission amount and its method are the same as those described in the description of the audio multiplex signal circuit, a detailed explanation will be omitted. However, the signal does not need to be synchronized with the screen. The digital data for multiplexing 63 is a signal for data communication such as FAX, and is formatted by the digital data multiplex signal circuit 11 so as to be transmitted during the video signal period, and is selected by the multiplex signal selection circuit 3. When used for data communications, it is possible to transmit signals such as faxes faster than before.

Next, a television signal processing method on the receiving side in an embodiment of the present invention will be described. FIG. 8 is a block diagram illustrating a television signal processing method on the receiving side according to an embodiment of the present invention.
81 is a reception demodulation circuit; 82 is a vertical retrace period data extraction circuit; 83 is a decoding control signal generation circuit;
4 is a video signal selection circuit, 85 is a video high frequency addition circuit, 86 is a wide aspect video addition circuit, 87
88 is a scramble decoding circuit, 88 is a small screen video addition circuit, 89 is a multiplex audio signal decoding circuit, 90 is a multiplex digital data decoding circuit, 91 is an audio processing circuit, 92 is a display path, 93 is a sound generator, and 94 is a demodulated video signal , 95 is a demodulated multiplexed signal, and 96 is decoded digital data.

A new television signal synthesized as an embodiment of the present invention is subjected to orthogonal detection in a reception demodulation circuit 81 to obtain a demodulated video signal and a demodulated multiplex signal. First, from this signal, the vertical retrace period data extraction circuit 82
The superimposed control signal is taken out and sent to the decoding control signal generation circuit 83. The decoding control signal generation circuit 83 generates control signals for each circuit to control the entire receiver. The various decoded video signals are selected as necessary by the video signal selection circuit 84, and the time axis is compressed as necessary so that the width of the screen becomes 4/5, for example, a CRT with an aspect ratio of 5:4 is used. It is displayed on the display 92 as a television screen. The decoded audio signal undergoes necessary processing and is output as sound by a sound generator 93 such as a speaker. Each block will be explained in detail below.

First, the reception demodulation circuit 81 shown in FIG. 8 will be explained. In the following, we will take the case of terrestrial broadcasting as an example. FIG. 9a is a block diagram of a reception demodulation circuit of a current television receiver that performs video synchronous detection. 1
01 is an antenna, 102 is a tuner, 103 is a video intermediate frequency filter, 104 is a video detector, 10
5 is a carrier wave regeneration circuit, and 106 is a video baseband signal output terminal. A signal sent from the transmitting side is received by an antenna 101, frequency-converted to an intermediate frequency band by a tuner 102, and band-limited by a video intermediate frequency filter 103. The band-limited signal is transmitted to a video detector 104 and a carrier regeneration circuit 10.
5. The carrier wave regeneration circuit 105 regenerates the carrier wave I1 for synchronous detection. The band-limited signal is detected by the video detector 104 using the carrier wave I1, and becomes a video baseband signal. Here, the frequency characteristics of the video intermediate frequency filter 103 will be described. The 9th one shows the frequency characteristics.
Figure b. That is, the amplitude is attenuated by 6 dB at the video carrier wave I1, and the Nyquist filter characteristic has an amplitude characteristic that is almost symmetrical with respect to the video carrier wave I1. On the other hand, as shown in Fig. 2b, if the multiplexed signal is band-limited by a filter having a frequency characteristic opposite to that of the video intermediate frequency filter of the receiver, the multiplexed signal component in the shaded area in Fig. 9b is almost a double-sided band. If this is expressed as a vector, it will look like Figure 9c. Here, I1 is a video carrier wave of the video baseband, and I2 is a carrier wave of a multiplexed signal, which has the same frequency as I1 and a phase difference of 90 degrees. The video baseband signal is carrier wave I1
If we focus on , it becomes a residual sideband, so
The upper and lower sideband waves become vector au and vector a _L , and when decomposed into orthogonal vectors, they become vector a1 and vector a2. Furthermore, since the multiplexed signal has almost double sidebands, if the upper and lower sidebands are vector bu and vector b _L , their combined vector will be b2, which will consist of only the components orthogonal to vector I1. That is, when synchronously detecting the carrier wave I1, vectors a2, b
Orthogonal distortion due to two components does not occur, and in principle, interference due to multiplexed signals to current television receivers that perform video synchronous detection does not occur.

Next, a multiplexed signal demodulation method on the receiving side in an embodiment of the present invention will be described. The video intermediate frequency band signal output from the tuner is band-limited by a filter so that the video baseband signal becomes a double-sided band as shown in FIG. 10a. If this is expressed as a vector, it will look like Figure 10b. Since the multiplexed signal has vestigial sidebands when considering the carrier wave I2 as the center, the upper and lower sidebands become vectors bu and _bL , and when decomposed into orthogonal vectors, they become vectors b1 and b2. Also, since the video baseband signal becomes almost both sidebands due to the filter, the upper and lower sidebands are vectored.
If au and a _L are used, their combined vector will be a1, which will contain only the component orthogonal to vector I2.
That is, when synchronously detecting the carrier wave I2, the vector a1,
Orthogonal distortion due to the b1 component does not occur, and only the multiplexed signal component can be demodulated. Figure 10c is the 8th
This is an example of a block diagram of a reception demodulation circuit 81 of a television receiver that demodulates the multiplexed signal shown in the figure.
131 is an antenna, 132 is a tuner, 133 is a video intermediate frequency filter, 134 is a video detector, 1
35 is a carrier wave regeneration circuit, 137 is a filter, 13
8 is a phase shifter, and 139 is a multiple signal detector. A signal sent from the transmitting side is received by an antenna 131, frequency-converted to an intermediate frequency band by a tuner 132, and band-limited by a video intermediate frequency filter 33. The band-limited signal is processed by a video detector 13.
4, is supplied to the carrier wave regeneration circuit 135. The carrier wave regeneration circuit 135 regenerates the carrier wave I1 for synchronous detection. The band-limited signal is detected by the video detector 134 using the carrier wave I1, and becomes a video baseband signal. Further, the output of the tuner 132 is band-limited by a filter 137 as shown in FIG. 10a. Carrier wave I obtained from carrier wave regeneration circuit 135
The band-limited signal is synchronously detected in a multiplex signal detector 139 using a carrier wave I2 whose phase is shifted by 90 degrees from the carrier wave 1 by a phase shifter 138. The detection output becomes a multiplexed signal.

As described above, in the current receiving and demodulating circuit, the multiplexed signal is almost canceled by synchronous detection using the video carrier wave I1, so that almost no interference due to the multiplexed signal occurs. Further, in the receiving demodulation circuit 81 for multiplexed signal demodulation, not only the video baseband signal but also the multiplexed signal can be extracted without orthogonal distortion by filtering and synchronous detection using the video carrier wave I2, as in the above processing.

Next, the video high frequency addition circuit 85 shown in FIG. 8 will be explained. FIG. 11 is a block diagram of the video high frequency addition circuit 85, in which 150 is a frequency conversion circuit, 151
152 is a wideband signal synthesis circuit, and 152 is a decoded wideband signal. The decoded multiplexed signal 95 is sent to the frequency conversion circuit 15
0 to return to the original band and wideband signal synthesis circuit 15
1 and is added to the demodulated video signal 94 to obtain a decoded wideband signal 152. This signal is selected by a video signal selection circuit 84 shown in FIG. It goes without saying that if necessary, the superimposed high-frequency signal can be returned to its original state after frequency conversion.

Next, the wide aspect video addition circuit 8 in Fig. 8
6 will be explained. FIG. 12 is a block diagram of the wide aspect video adding circuit 86. 161
1 is a first time-base compression circuit, 162 is a second time-base compression circuit, 163 is a wide aspect signal synthesis circuit, and 164 is a decoded wide aspect video signal. The decoding is performed by performing the operation opposite to that on the transmitting side shown in FIGS. 5 and 6. The decoded signal is displayed on a screen that is wider than usual. It goes without saying that the left and right widths of the signals added to both sides can be controlled by control signals from the decoding control signal generation circuit as necessary.

Next, the scramble decoding circuit 87 shown in FIG. 8 will be explained. Figure 13 shows the scramble decoding circuit 8
7 is a block diagram of FIG. 171 is a scramble decoding circuit, 172 is a descramble control signal generation circuit 173 is a decoded pay video signal, and 174 is a user key code. A control signal for unscrambling is generated from the demodulated multiplexed signal 95 and a user key code 174 sent from, for example, a microcomputer (not shown), and a scramble decoding circuit 171 restores the normal screen to a decoded paid video signal 173.

Next, the small screen video adding circuit 88 shown in FIG. 8 will be explained. FIG. 14 is a block diagram of the small screen video addition circuit 88. 181 is a first time axis compression circuit, 182 is a second time axis compression circuit, 183 is a small screen signal synthesis circuit, and 184 is a decoded small screen video signal. This will be explained using FIG. 15. The demodulated video signal (a) in FIG.
15b is compressed by the second time-base compression circuit 182 so that it is located on the right side of the screen, and is synthesized by the small screen signal synthesis circuit 183 as shown in FIG. 15c, resulting in a decoded small screen video signal. It becomes 184. As explained at the right end of the screen, you can similarly place the small screen at any position on the screen.

In addition, in FIG. 8, the multiplex audio signal decoding circuit 8
9. The multiplex digital data decoding circuit 90 may perform the operation opposite to that of the transmitting side, so a detailed explanation will be omitted.

Effects of the Invention As is clear from the above explanation, a signal different from the television signal is superimposed within the band of the television signal subjected to vestigial sideband amplitude modulation, and its control signal is superimposed during the vertical retrace period. By doing so, it is possible to multiplex other signals within the band of the current television system and enable various information provision services. And it is compatible with current television receivers without causing any interference. In addition, a dedicated receiver can extract multiplexed signals without orthogonal distortion, allowing you to enjoy a variety of screens and sounds, which is extremely effective from the standpoint of effective use of radio wave resources.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a television signal processing method on the transmitting side in an embodiment of the present invention, and FIG. 2 is an explanation of a television signal subjected to vestigial sideband amplitude modulation in an embodiment of the present invention. Figure 3 is a block diagram of the orthogonal modulation circuit.
Figure 4 is a block diagram of the video high frequency auxiliary signal circuit, Figure 5 is a block diagram of the wide aspect video auxiliary circuit, Figure 6 is a waveform diagram explaining the operation of the wide aspect video auxiliary signal circuit, and Figure 7 is a block diagram of the wide aspect video auxiliary signal circuit. A block diagram of a scrambling processing circuit, FIG. 8 is a block diagram explaining a television signal processing method on the receiving side according to an embodiment of the present invention, and FIG. 9 is a block diagram of a current television receiver that performs video synchronized detection. Fig. 10 is a block diagram, spectrum diagram, and vector diagram of the reception demodulation circuit in one embodiment of the present invention, and Fig. 11 is a spectrum diagram and a vector diagram of the reception demodulation circuit in an embodiment of the present invention. A block diagram of the circuit. Figure 12 is a block diagram of a wide aspect video addition circuit, Figure 13 is a block diagram of a scramble decoding circuit, Figure 14 is a block diagram of a small screen video addition circuit, and Figure 15 is a block diagram of a small screen video addition circuit. FIG. 16, a waveform diagram for explaining the operation of the circuit, is a spectrum diagram showing an NTSC television signal on a two-dimensional plane with a temporal frequency of ₁ and a vertical frequency of ₂ . DESCRIPTION OF SYMBOLS 1...Vertical retrace period data superimposition circuit, 2...Control signal generation circuit, 3...Multiple signal selection circuit, 12
...Video signal selection circuit, 28...Second filter,
137...Filter.

Claims (1)

[Claims] 1. A carrier wave having the same frequency as the carrier wave and having a phase difference of ±90 degrees within the band of a signal obtained by modulating the vestigial sideband amplitude of a predetermined carrier wave with the television signal. Different multiplexed signals are carrier-suppressed double-sided band amplitude modulated, attenuated by half at the carrier frequency, and multiplexed into vestigial sidebands by a Nyquist filter having symmetrical amplitude characteristics with respect to the carrier frequency, thereby combining the television signal and the multiplexed signal. A digital control signal is superimposed on at least one vertical retrace interval, and the multiplexed signal is a variety of signals for supplementing the television signal or a variety of signals for transmitting independent information; A television signal processing method characterized by transmitting a type. 2. The television signal processing method according to claim 1, wherein the signal modulated by the multiplexed signal is a signal that is not multiplexed during a synchronization signal period. 3. For a multiplexed signal different from a television signal, the television signal on which the multiplexed signal is superimposed is band-limited with a filter that removes orthogonal distortion and subjected to synchronous detection, or after synchronous detection, band-limited with a filter that removes orthogonal distortion. 2. The television signal processing method according to claim 1, wherein the television signal processing method is performed by demodulating the signal. 4. The auxiliary signal is characterized by being a video high-frequency signal of a television signal, a video signal on both sides of the screen to make the screen aspect ratio horizontal, an auxiliary audio signal, a program identification code, or descrambling information. A television signal processing method according to claim 1. 5. The television signal according to claim 1, wherein the independent information is a digitally coded independent audio signal, an independent small screen television signal, or an independent data communication signal. Processing method. 6. The television according to claim 3, wherein the digital control signal is demodulated and the control data controls which type of screen assistance to perform or which type of independent information to provide. Signal processing method.