KR910004291B1 - Multi-television signal processing apparatus - Google Patents

Abstract

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Description

Multi-TV Signal Processing Equipment

2, 12a, 16a and 18a are block diagrams each showing a multiple signal processor in the transmission side embodying the present invention.

4C, 12B, 18B and 16B are each a block diagram showing a multiple signal processor in a receiving axis embodying the present invention.

1A-1C and 11F-11J are spectral diagrams illustrating a processing method of a multiple signal processor in a transmission side according to the present invention.

4a is a spectrum diagram showing a processing method of a multiple signal processor at a receiving side according to the present invention;

4b is a vector diagram illustrating the principle of a multiple signal processor at a receiving side according to the present invention.

3A, 3B and 3C or a block diagram, spectrum diagram and vector diagram showing a conventional television receiver when receiving a composite signal generated by a multiple signal processor.

5 is a waveform diagram illustrating the function of a signal separator.

6 is a block diagram of a signal separator.

11A-11E are signal waveform diagrams illustrating the signal processing step of FIG. 6 according to the present invention.

7 is a block diagram of a signal synthesizer.

8 is an example of time-base representation of a display screen and a composite video signal of an existing television.

9 is an example of a display screen with aspect ratio 5: 3 and time axis representation of a composite video signal.

10 is image synthesis at different aspect ratios.

Internal circuit synthesis of the signal generator 125 of FIG. 13a or 12a.

13B is an exemplary diagram of a reference identification signal.

14 is the internal circuit synthesis of the signal separator 131 of FIG.

FIG. 15 shows the internal circuit synthesis of the signal selector 137 of FIG.

17a and 17c block diagrams of two embodiments of a scrambler.

Fig. 17B is a diagram explaining a scrambled screen.

The present invention relates to an apparatus for multiplexing a specific signal with an amplitude modulated television signal, transmitting and receiving multiple signals, and extracting a specific signal from the multiple signals.

It is almost 30 years since the color television broadcast of the current NTSC (National Television System Commitee) system began in 1960. Recently, high-precision and high-performance television methods have been proposed, including several new methods including HDTV (high definition television) methods developed by NHK (Japan Broadcasting Corporation). At the same time, the content of programs offered to viewers is shifting from simple studio programs to higher-quality images and more realistic programs, such as a cinema-size movie.

The current NTSC broadcast is 525 lines, 2: 1 interl-aced, luminance signal bandwidth 4.2MHZ and standardized as aspect ratio 4: 3 (prichard, "US Color Television Fundamentals-"). AReview @ "IEEE Trans. Consumer Electron., Vol. CE-23, pp. 467-478, Nov. 1977).

Against this backdrop, several methods of constructing television signals have been proposed in pursuit of harmony with current broadcasting methods. One such example is described by Fukinuki and Hirano, "High Definition TV Fully Compatible with Current Standards." IEEE Trans. Commun. Vol. COM-32, pp. 948-953, aug. Presented in 1984. Considering the NTSC television signal appearing on the two-dimensional plane of the temporal frequency f ₁ and the vertical frequency f ₂ , the color signal C is present in the second and fourth quadrants because of the correlation to the Chrominance Subcarrier fsc. . In the example of Fukinuki et al., Empty first and third upper limits are used to multiplex high-frequency components of the luminance signal. The color signal and multiple high frequency components are separated and reproduced at the receiving end to enhance horizontal resolution.

In this example, conventional NTSC receivers are interfered by multiple signals because they lack the ability to separate color signals from multiple high frequency components.

Current television broadcasts, as mentioned above, are limited in signal bandwidth and difficult to add new information of good quality. For example, other methods to increase horizontal resolution have been proposed (M. Isnr et al. LR "A single Channel NTSC Compatible Widescreen EDTV System", HDTV Colloquium in OttaWA, 1987, 10). Many problems remain unresolved in terms of compatibility with deregulation.

On the other hand, the transmission band cannot be easily extended in view of the effective use of radio resources.

We invented a method of superimposing a signal using quadrature modulation of an image carrier (US Patent Application No. 76804). In this way, the newly set orthogonal channel can be used to transmit various signals, and the interference to the conventional NTSC receiver is fundamentally small. In practice, however, interference is detected because the filter characteristics at the receiver and transmitter are incomplete.

The present invention is one solution to this practical problem when quadrature modulation is performed in practical use. If such a circuit occurs and the filter is incomplete, the disturbance to the conventional NTSC receiver can be reduced to a desirable level. In this sense, the present invention is very useful when there is orthogonal modulation of an image carrier.

It is a first object of the present invention to provide a multi-signal processing apparatus capable of multi-transmitting a large amount of information within a limited bandwidth without disturbing the current receiver.

According to the present invention, the multi-signal processor at the transmitter side includes a hidden portion of the main NTSC signal (a portion which is not displayed on the screen by overscanning of the receiver) and a front inlet of the horizontal synchronization signal of the first specific multiple signal and the main NTSC signal. porch), amplitude-modulated main video carrier according to the main signal to obtain a residual side band (VSB) signal, amplitude-modulated carriers having the same frequency, and phase shifted from the main carrier 90 degrees by the second specific multiplex signal Obtain the waveband signal. The modulated multiple signal is passed through an inverse Nyquist filter to obtain a residual sideband (VSB) signal and then multiplexed over the modulated main signal.

The multiple signal processor on the receiver side has a synchronization detector and an orthogonal distortion reduction filter for detecting multiple signals from the main and received multiple signals.

By this arrangement, by generating a television signal capable of multiplexing other information in the standard band of existing television broadcasts, the receiver can obtain multiple information as well as conventional television broadcasts.

For example, if the side panel of a wider aspect screen than the conventional 4: 3 is transmitted as the first and second multiple signals, the wider aspect screen is the main signal (4: 3 NTSC) and the multiple signal ( From the side panel). In this case, the low and high frequency components of the side panel may be transmitted as the first and second multiple signals, respectively. The DC component of the first multiple signal is easily transmitted to maintain continuity between the side panel and the center panel (a signal corresponding to 4: 3 aspect ratio). On the other hand, the second multiple signal can be easily scrambled in order to reduce interference to the conventional receiver.

Using this technique, when multiple signals are received by existing television receivers, there is little interference by the multiple signals. In other words, compatibility with existing television receivers can be maintained. It is also very advantageous from the point of view of efficient use of radio resources that multiple transmissions of different information are possible in the frequency band measured by the standard. 1A-1C are spectral diagrams showing a television signal processing method on the transmission side. In particular, Fig. 1A is a spectral diagram of the amplitude-modulated television signal residual side band of the NTSC television system in which the low side band of the image carrier P ₁ is the residual side band. In this case the signal can be modulated in any television signal amplitude and thus this does not limit the NTSC television signal. The 1b turning "inverse Nyquist filter" is also called the spectrum of the modulated signal and the video carrier signal equals the frequency obtained by the 90-degree phase-amplitude modulation multiple signals by different carrier P ₂ from P ₁ to pass through a special filter called to be. The propagation characteristics of the inverse Nyquist filter are infinite attenuation at the frequency P ₂ -6dB, P ₂ + 1.25MHZ, and no attenuation at P ₂ -1.25MHZ. Preferably, the P ₂ carrier is removed in the blanking period of the main television signal.

The signal shown in FIG. 1B is multiplexed together with the main television signal of FIG. 1A to obtain a composite signal shown in FIG. 1C. The multiple signal may be an analog signal or a digital signal.

2 is a block diagram showing a television multiple signal processor at the transmission side as an embodiment of the present invention. The main signal generator 601 generates a main signal such as an image basic band signal. The multiple signal generator 602 generates multiple signals, which are analog or digital signals. The main and multiple signals are supplied to the multiple signal redundancy circuit 13 via input terminals 10 and 11, respectively. In the multiple signal redundancy circuit 13, the multiple signals are separated into two parts in the signal separator 6, one of which is multiplexed with the main signal in the time multiplexer 1, and the other in the amplitude modulator 7 Is modulated.

5 shows the function of the time multiplexer 1 when the main signal is a video basic band signal. In FIG. 5, the waveform (a) shows the composite video basic band signal between the horizontal synchronization signal and the burst signal of the color carrier, (b) shows the multiple signal from the signal separator 6, and (c) Denotes a time multiplexing signal output from the time multiplexer 1. In this case, the multiple signal from the signal separator 6 is multiplexed at the front entrance of the horizontal synchronization signal of the main video basic band signal and the hidden part of the overscan. By the main signal coming from the time multiplexer 1, the video baseband signal is multiplexed with the multiple signal parts, and the carrier P ₁ generated by the oscillator 4 is amplitude modulated in the amplitude modulator. The obtained modulation signal is filtered by the VSB filter 3 into a residual sideband inverse signal and supplied to the adder 9. The VSB filter 3 is a filter for converting both sideband signals into residual sideband signals. The carrier P ₁ from the oscillator 4 is phase shifted by 90 degrees by the phase converter 5 to become the carrier P ₂ . 6 shows an embodiment of the signal separator 6. In FIG. 6, the multiple signal generated by the multiple signal generator 602 is supplied to the low pass filter 610 and the subtractor 611. The low frequency components are time compressed in the time compression circuit 612 and supplied to the time multiplexer 1. On the other hand, the high frequency component of the multiple signal is obtained by the subtractor 611 and time extended by the time extension circuit 613 to be a narrower bandwidth signal and supplied to the amplitude modulator 7. In this embodiment the input multiple signals are separated by their frequency. In other words, other attributes, such as the amplitude and time of the input signal, can be factored into the signal splitter. Returning to the first road, the carrier P ₂ is amplitude-modulated in both side bands in the amplitude modulator 7 by one of the two parts of the multiple signals separated by the signal separator 6, and the carrier within the attribution period is preferably suppressed. The phase shift direction of the phase shifter 5 is fixed or varied in the interval, field or frame of the horizontal scanning period. The modulated multiple signal is in-band limited by an inverse Nyquist filter 8 and then fed to the adder 9. The amplitude frequency characteristic of the inverse Nyquist filter 8 is symmetrical with respect to the amplitude frequency characteristic associated with the image carrier just before the image detection at the receiver.

The output of the adder 9 is a composite signal. That is, the modulated multiple signal is superimposed on the modulated video baseband signal by the adder 9 to obtain a composite signal. The composite signal appearing at the output terminal 12 of the multiple signal duplication circuit 13 is transmitted from the transmitter 58 to the antenna 59. The transmission path is not limited to the wireless method but may be a wired method. In this embodiment, the composite signal is obtained by being applied to the output of the VSB filter 3 and the inverse Nyquist filter 8, but also sums the outputs of the amplitude modulator 2 and the inverse Nyquist filter 8. May be supplied to the VSB filter 3 to obtain a composite signal.

On the other hand, the TV multiplex processor at the receiving side is as follows. The following example relates to, but is not intended to limit, NTSC television terrestrial broadcasting. 3a is a block diagram of an existing television receiver with a synchronous video detector. The transmission signal at the transmitting side is received by the antenna 21, frequency-converted by the tuner 22 to the intermediate frequency band, and restricted by the Nyquist filter 23 in the band. The band limit signal is supplied to the image detector 24 and the carrier reproducer 25. The image carrier I ₁ for synchronous detection is reproduced in the carrier regenerator 25. The band limit signal is synchronously detected by the carrier I ₁ by the image detector 24 to obtain a main signal, that is, an image basic band signal, by the output terminal 26.

The frequency characteristics of the Nyquist filter 23 are as follows. Figure 3b the amplitude of the picture carrier ₍₁ I) attenuated by 6dB, and the Nyquist filter characteristic in showing the frequency characteristic of the Nyquist filter 23 has a substantially symmetrical amplitude oejjak property with respect to the image carrier ₍₁ I).

On the other hand, in FIG. 1B, the multi-signal is a multi-signal in the oblique portion of FIG. 3B when limited in band by an inverse Nyquist filter 8 in the transmitter having an inverse characteristic with respect to the frequency characteristic of the Nyquist filter 23 of the receiver. The component is almost bilateral. In FIG. 3c, I1 represents a vector carrier of a main signal, that is, a vector baseband signal, and I ₂ is a carrier of a multi-signal in which the carrier is the same frequency but is 90 degrees out of phase with I ₁ . . Since the image baseband signal becomes the residual sideband with respect to the carrier I ₁ , the upper and lower sidebands become the vectors au and the vector aL, respectively, and when decomposed into the orthogonal vectors, the vector a1 and the vector a2 are respectively. Since the upper and lower bands of the multiple signal are represented by the vectors bu and bL, respectively, the composite vector having only the components orthogonal to the vector I ₁ becomes b2.

That is, when the main signal is synchronously detected by the carrier I ₁ , orthogonal distortion by the vector (a2) and vector (b2) components does not occur, and interference by multiple signals to the existing television receiver performing image synchronous detection does not occur in principle. Do not.

Detection of multiple signals at the next receiver is as follows. The signal of the image intermediate frequency band, which is the output of the tuner 22, is band-limited by the band filter as shown in FIG. 4A, and the main signal, i.e., the image baseband signal, becomes a bilateral wave band. The vector diagram is shown in FIG. 4B. Since the multiple signal is a residual sideband, the upper and lower bands are the vector bu and the vector bL, respectively, and the composite vector is only a1 orthogonal to the vector I ₂ .

That is, when the multiple signals are synchronously detected by the carrier wave I ₂ , orthogonal distortion by the vector a1 and vector b1 components does not occur. Thus, only multiple signal components are demodulated.

4C is an example of a television multiple signal processor which demodulates (demodulates) a multiple signal like the main signal. The multiple signal transmitted from the transmitting side is received by the antenna 31, the frequency is converted into the intermediate frequency by the tuner 32, and is supplied to the multiple signal separator 44 through the input terminal 41. The supply signal is band-limited by the Nyquist filter 33. The band limit signal is supplied to the image detector 34 and the carrier reproducer 35. The carrier carrier 35 reproduces the image carrier I ₁ for synchronous detection. The band limit signal is synchronously detected by the carrier I ₁ in the image detector 34 and supplied to the time canceller 36. In the time multiplexer 36, the main signal and the first multiplexed signal are separated. This processing is the reverse of that of the time multiplexer 1 of the multiple signal duplication circuit 13 on the transmitting side. The first multiplexed signal is supplied to the signal synthesizer 40, and the main signal and the baseband video signal go to the output terminal 42 of the multiplexed signal separator 44. The main signal is converted to, for example, R, G, and B signals by the main signal processor 603 and displayed on the CRT screen 1000.

In addition, the output of the tuner 32 is band-limited by the band filter 37 as in the fourth degree. Band-limited signal by carrier I ₂ (i.e., by carrier I ₂ in the same phase as a carrier for multiple signal modulation used on the transmitting side) obtained by carrier I ₁ , which is phase shifted by phase converter 38 by 90 degrees. Is detected synchronously by the multiple signal detector 39 to obtain a second multiplexed signal. The second multiple signal is synthesized in the signal polymerizer 40 together with the first multiple signal into the original multiple signal.

7 shows an example of the signal synthesizer 40. In this figure, the first multiplexed signal from the time multiplexer 36 is time-extended in the time extension circuit 401. The second multiple signal from the multiple signal detector 39 is added to the time extension first multiple signal in the adder 402. The synthesized multiple signal output of the adder 402 is supplied to the output terminal 43 of the multiple signal separator 44. In the multiple signal generator 604, the synthesized multiple signal is reversely processed by the multiple signal generator 602 at the transmitting side.

As described above, in the existing receiver, the multiple signals are synchronously detected by the image carrier I ₁ and virtually disappeared. Therefore, the main signal is not disturbed by the multiple signals. In addition, in the receiver capable of multiple signal demodulation, not only the main signal, that is, the image baseband signal, but also the multiple signal demodulation can be obtained in the same manner as described above. In addition, the multiple signal has no orthogonal distortion and filtering and synchronous detection by the carrier I ₂ . Can get by. This is not limited to the NTSC television system and can be applied to any system that can modulate the main signal in the residual sidebands.

8 and 9 are conceptual diagrams of a widescreen television system. In this figure, the aspect ratio of the widescreen television system is 5: 3, but is not limited to this ratio. Figure 8 depicts the current NTSC screen (a) and its corresponding waveform (b). The circle and its arc appear in the 4: 3 frame. 9 shows a 5: 3 screen (a) and its corresponding waveform (b), and three circles are displayed. When we see only the 5: 3 screen in Fig. 9, three circles are recognized. Side panels must be transmitted as multiple signals for clear recognition of this purpose.

10 shows the difference between the aspect ratio of the conventional NTSC system and the widescreen TV system. In this figure, (S) means the side panel treated as one signal and transmitted as multiple signals and (M) means the center panel corresponding to the current 4: 3 frame (main signal).

These side panels and the center panel have the same frequency, but the bandwidth of the multiple signal should be approximately 1.25MHZ according to the above expression.

11A-11J show waveforms and power spectra of various points of the signal separator 6 of FIG. 11A shows multiple signals corresponding to two parts of the side panel. Figure 11f shows a representative output spectrum of the multiple signal. Firstly, the input multiple signal (Fig. 11a) is supplied to the low pass filter 610, where a low frequency component (Fig. 11b shows its waveform and (g) shows the output spectrum) is obtained. This signal is time compressed in the time compression circuit 612 up to the bandwidth of the original signal. Fig. 11C shows a time compression signal and (h) shows its output spectrum. On the other hand, a high frequency component (Fig. 11D shows its waveform and (i) shows its output spectrum) is obtained by the subtractor 611. This signal is time-extended at the time extension signal 613. FIG. 11E shows the waveform of the time extension signal and FIG. 11J shows the bandwidth which is almost 1.25MHZ.

Thus, the multi-signal is time-base processed and separated into two parts, one of which is transmitted through the main channel for repositioning the hidden portion of the overscan and the forward inlet of the synchronization signal, and the other is transmitted through the orthogonal modulation of the image carrier.

12 is a block diagram showing a television multiple signal processor having a wide aspect ratio at the transmitting side. In FIG. 12A, the signal supplied to the input terminal 111 is a luminance signal Y obtained from a signal picked up by a camera having a wider aspect ratio (for example, 16: 9) than the existing one. The signal supplied to 114 is the wideband color difference signal I obtained from the same pickup signal, and the signal supplied to the input terminal 117 is the narrowband color difference signal Q.

The luminance signal Y is returned to the signal divider 112 and distributed into the time axis extension circuit 113 and the adder 123. Similarly, the wideband color difference signal (I) and narrowband color signal (Q) enter signal dividers 115 and 118, respectively, and are distributed to new axis extension circuits 116 and 119, respectively, and to balance modulator 122. . Each time axis extension circuit e.g. time-extends the signal that the write and read clocks of the memory provided therein have changed.

When the original screen is stretched to the side and picked up in aspect ratio m: 3 (m is a real number of 4 or more), the pick-up signal corresponding to the portion produced on the screen of the existing television receiver is obtained by the time-base extension circuits 113, 116, At 119 it is stretched m / 4 times on the time axis.

The remaining color difference signal different from that extended by the time axis extension circuits 116 and 119 of the color difference signal distributed by the next signal divider 115 and 118 is modulated by the balance modulator 122 and added to the adder 123. Thereby combining the luminance signal extended by the time axis extension circuit 113 with other residual luminance components. The output of the adder 123 is supplied as a multiple signal to the multiple signal redundancy circuit 13 via the multiple signal input terminal 11.

The output signals of the time-scale extension circuits 116 and 119 are modulated by the balance modulator 120, and the output of the balance modulator 120 is output by the adder 121 from the time-axis extension circuit 113 and the synchronization signal. And a branch signal and an identification signal are generated by the signal generator 125. The identification signal is for discriminating the composite television signal of this processor from the conventional television signal. The identification signal may overlap, for example, in the vertical blanking period.

The output of the adder 121 is supplied as a main signal to the multiple signal duplication circuit 13 via the main signal input terminal 10. The output of the multiple signal redundancy circuit 13 appearing at the terminal 12 is a demodulated signal in which multiple signals are duplicated on the video base bend main signal. This demodulated signal is transmitted via the transmitter 58 and the antenna 59.

FIG. 13A is a block diagram of the signal generator 125 of FIG. 12A in which the synchronous signal generator 126 and the branch signal generator 127, as in the conventional broadcasting method, generate the synchronous signal and the branch signal, respectively.

The identification signal transmitter 128 generates an identification signal for discriminating whether or not a screen having a wide aspect ratio has been sent. The identification signal is, for example, a pilot signal in the retrace period or duplicated as in FIG. 13B. The sum of the outputs of these three generators 126, 127, 128 is directed as the output from the signal generator 125.

12B is a block diagram of a television multiple signal processor having a wide aspect ratio on the receiving side. The demodulation signal received at the tuner 32 via the antenna 31 and transmitted at the transmitting side as in FIG. 12A is the main signal output terminal 42 of the multiple signal separator 44 at the multiple signal separator 44. And the main signal and the multiple signal guided from the multiple signal output terminal 43, respectively.

The video base bend signal, which is the main signal, is separated into the luminance signal Y and the color signal C by the YC separator 132. The signal Y is compressed in the time axis by the time axis compression circuit 134 to become the signal Y ₁ . The signal C is separated into color difference signals I and Q by the I and Q demodulators 133. The signal I is compressed on the time axis by the time axis compression circuit 135 to become the signal I ₁ . The signal Q is time-compressed by the time-base compression circuit 136 to become the signal Q ₁ . The multiple signals are time compressed by the time compression circuit 138 and then separated into signals Y ₂ , I ₁ and Q ₂ by the YC separator 139 and the I, Q demodulator 140. Signals Y ₁ , I ₁ , Q ₁ , Y ₂ , I ₂ and Q ₂ are fed to a signal selector 137 where signals Y ₁ , I ₁ and Q ₁ are conventional television receivers of aspect ratio 4: 3. It is selected for the part corresponding to the center panel of. For the remainder of one horizontal scanning period, a attribution signal or the like is generated and selected when receiving a conventional television signal, and signals Y2, I2 and Q2 are selected when receiving the wide television signal. The matrix circuit 141 generates R, G, and B signals from the selected signal output from the signal selector 137. R, G, and B signals are supplied to the CRT 1000.

Incidentally, the time-base compression circuits 134, 135, 136, and 138 receive the conventional television signal without any problem, and compress the television signal by compressing the time-base extension portion of the wide television signal having the laterally stretched aspect ratio. Play it. That is, it is necessary to compress the time axis of the conventional television signal in order to receive the screen of the existing broadcast without changing the aspect ratio as is apparent from the comparison between FIGS. 8B and 9B. The compression ratio is determined by the aspect ratio.

The signal separator 131 separates an identification signal, a color splitter signal, and a widescreen signal for distinguishing the television signal of the existing broadcast from the synchronization signal from the video baseband signal. The signal selector 137 is controlled by this identification signal.

FIG. 14 is a block diagram of the signal separator 131 of FIG. 12B constituting the gate circuit 144. The image baseband signal is supplied to the gate circuit 144 as a main signal. The identification signal is separated from the video baseband signal by the gate circuit 144. For example, the identification signal is duplicated in the attribution period of the video baseband signal, so the separation thereof is easy.

FIG. 15 is a block diagram of the signal selector 137 of FIG. 12B. If it is determined that the received signal is not the screen of the wide aspect ratio by the identification signal, the signals Y1, I1 and Q1 are selected in the selectors 146 and 147 and the attribution signal generated in the attribution signal generator 148 is attributable. It is chosen from the period. If the received signal is determined by the identification signal to be for a wide aspect ratio screen, the signals Y2, I2 and Q2 are selected by the selector 146 (147).

Since the signal extended on the time side is widened in the band when the time base is compressed on the receiver side, the resolution (resolution) does not decrease even when the aspect ratio is increased. Multiple signals that do not appear on the screen with aspect ratio 4: 3 are almost lost in conventional receivers by synchronous detection using image carriers, and therefore, interference by multiple signals is difficult to occur. In a widescreen receiver, multiple signals including the image signal to be displayed on the side of the wide aspect ratio screen are reproduced by the aftermath of synchronous detection using a phase controlled carrier without orthogonal distortion. When a television signal having a conventional aspect ratio 4: 3 is received, it is displayed near the middle of the screen of aspect ratio 5: 3 and both sides of the screen are for example attributed.

16A is a block diagram of another multi-signal processor at the transmitting side. The difference between the second and the sixteenth (a) degrees is the presence of the scrambler 51. The main function of this scrambler is to reduce interference with conventional television receivers and quasi-synchronous video detectors due to quadrature modulation by multiple signals. The scrambler is also used as a pay television to use widescreen television. The method of scrambling (overlapping) is the frequency inversion, the time axis inversion, the exchange of the line S with the line S, the change of the left and right panels, the change of the polarity of the multiple signal lines by the line, and the field. There are many ways, such as changing the polarity of multiple sign systems.

The multiple signal generated by the multiple signal generator 602 is supplied to the signal separator 6 and separated into two parts, for example, by frequency. In the first part, the low frequency component of the multiple signal is supplied to the time multiplexer 1 and processed as described above. The second part, the high frequency component of the multiple signal, is supplied to the scrambler 51.

17A is a block diagram of the first embodiment of the scrambler 51. In this embodiment the input multiple signal is stored in the frame memory and compensated therefrom by the control signal from the timing generator 514. The multiple signals, which are normal high frequency components, come to the two frame store buffers 511 and 512 and are compensated by the control signals from the time regenerator 514. Control signals overlap, for example, in the vertical attribution period of multiple signals.

17B shows a display screen of overlapping multiple signals. If the left screen is the original multiple signal at the input of this nester, the right screen is the output of the nester. In this embodiment, the original multiplex signal is divided into three parts and transposed in a system or frame. As shown in FIG. 17A, other overlapping methods such as change of polarity of the line by the left and right exchange lines are possible only when the address for the frame buffer is changed. FIG. 17C is another example of the overlapper of FIG. 16A. In this example, the input multiplex signal is fed to modulator 515 and modulated by subcarrier fs from subcarrier generator 517. This modulator may be an amplitude modulator and fs may be fsc / 3 (fsc: color signal subcarrier, 3.579545M HZ). The modulated multiple signal is supplied to a band filter 516. In this case, if fs is about 1.2MHZ, the passband frequency of the bandpass filter 516 is 0.16MHZ to 1.2MHZ at -6dB point, and the output signal from the bandpass filter is directly converted into the original multiple signal. The power spectrum of the original multiple signal is as shown in FIG. 11J, and the switching multiple signal has a low output in the low frequency component and a high output in the high frequency component.

From the spectral diagram of FIG. 3b, the output of a right angle multiplex signal in an existing television receiver is low at high components and high at low components. For this reason, the influence of this embodiment is capable of interfering with the existing receiver from multiple channels, and is less affected than the original redundant circuit of FIG.

In the embodiment of FIG. 17C, the subcarrier fs is duplicated on the multiple signals in the repeater 513 within the reverse synchronization period, for example, to release the overlap at the receiving side.

16B is a block diagram of a receiving side multiple signal processor for receiving multiplexed signals transmitted from the transmitting side as in FIG. 16A. Multiple signals transmitted from the transmitting side are received by the antenna 31, the frequency is switched by the tuner 32 into the intermediate frequency band, and is limited in band by the Nyquist filter 33. The band limited signal is supplied to the image detector 34 and the carrier reproducer 35. The carrier regenerator 35 reproduces the image carrier I1 for synchronous detection. The band limit signal is detected by the carrier I1 in the image detector 34 and supplied to the time multiplexer 36.

In this multiplexer, the main signal and the first multiplexed signal are separated. The first multiple signal is for example overlapped in the overscan sound section of the front porch of the television receiver and / or the horizontal synchronization signal. This process is the reverse of the role of the time multiplexer 1 of the transmission-side multiple signal duplication circuit 13 in FIG. 16A. The second multiplexed signal enters the de-overlator 52 and is de-superimposed. This processing is performed in accordance with the overlapping control signal, which is the opposite of that in the overlapping device 51 on the transmitting side, for example, a signal showing that the line S has been switched to being the line S. FIG. The multiple signals are descrambled in the de-laminator 52 and then supplied to the time synthesizer 40 and synthesized with the first multiple signals. Finally, the synthesized multiple signal goes to the output terminal 43.

18A is a block diagram of another multi-signal processor at the transmitting side. This figure shows another variation of the multiple signal redundancy circuit 13 performing alternating quadrature amplitude modulation. The change in polarity of the amplitude modulation of the system relative to the line or system by the line reduces, or at least is less noticeable to the viewer, the disturbance to the existing television receiver. In FIG. 18A the amplitude modulator 55 is added and the selector 56 converts the modulation signal from the amplitude modulator 7 and the amplitude modulator 2 in the prescribed order.

18B is a block diagram of a receiving side multi-signal processor for receiving multiple signals generated by a processor as in FIG. 18A. This figure shows another variation of multiple signal separator 44, including alternating detectors. Alternately, the amplitude modulation signal as positive or sub modulation is detected to successfully demodulate multiple signals. The modulated signal from the band pass filter 37 is supplied to both the multiple signal detector 39 and the multiple signal detector 57 and detected.

The generated carrier I2 is supplied to both of the two multiple signal detectors 39 and 57. The detected multiple signal is one positive and the other negative and supplied to the selector 58 and selected in the prescribed order. This sequence is transmitted as a control signal or generated on the receiving side.

The original multiplex signal from the selector 58 is output and processed as above. When multiple signals do not have a DC component, negative and positive modulation are performed by changing the polarity of the original multiple signals. The exchange of multisignal polarity and the carrier polarity exchange are understood to be equivalent.

Claims (19)

Main signal generating means 601 for generating a television signal as a main signal; Multiple signal generating means (602) for generating multiple signals; Signal separating means (6) for separating the multiple signals from the first and second multiple signals; Time multiplexing means (1) for time multiplexing the second multiplexed signal and the main signal to obtain a time multiplexed main signal; Carrier generation means (4) for generating a first carrier; First amplitude modulating means (2) for amplitude-modulating the carrier according to the time modulated main signal to obtain a first residual sideband amplitude modulated signal; Phase shifting means (5) for phase shifting the first carrier by 90 degrees to obtain a second carrier; Second amplitude modulating means (7) for amplitude-modulating the carrier wave by a first multiplexed signal to obtain bilateral band amplitude modulated signals; An inverse Nyquist filter (8) having a Nyquist characteristic for filtering the two sideband amplitude modulated signals to obtain a second residual sideband and amplitude modulated signal; Adding means (9) for adding the first and second residual sideband amplitude modulated signals to obtain multiple signals; A multi-television signal processing apparatus in a television signal transmission system configured as transmission means (58) (59) for transmitting the multiple signals. 2. A multi-television television as claimed in claim 1, wherein said second amplitude modulating means (7) has means for removing said second carrier from both sidebands and amplitude modulating signals within a period corresponding to the retrace interval of said television signal. Signal processing device. 2. The apparatus of claim 1, further comprising means (125) for generating an identification signal for signal discrimination and means (129) for overlapping the identification signal within a vertical retrace interval of the first multiple signal. A Nyquist filter 33 for filtering multiple signals; Filter means (37) for filtering said multiple signal to eliminate crosstalk from a main signal to the multiple signal; Carrier reproducing means (35) for reproducing the first carrier from multiple signals; Main signal detecting means (34) for detecting the main signal from the multiple signals passed through the Nyquist filter by synchronous detection using the reproduced first carrier; Phase converting means (38) for converting a phase of the reproduced first carrier by 90 degrees to obtain the second carrier; First multiple signal detection means (39) for detecting a first multiple signal by a synchronous detector using a second carrier from said phase conversion means; And time release means 36 for time release of the main signal into the original main signal and the second multiplexed signal; A first signal obtained by amplitude-modulating a first carrier by a television signal as a main signal in a residual side band composed of a signal synthesizing means 40 for synthesizing the second multi-signal and the first multi-signal to obtain a multi-signal; Multiplexing with the first signal, filtering both sidebands and amplitude modulation signals by multiple signals in both sidebands and an inverse Nyquist filter to form a residual sideband signal and having the same frequency and 90 degrees phase difference as that of the first carrier; 2. A signal processing apparatus in a television signal receiving system for receiving a multiple signal comprising a second signal obtained by amplitude modulating a carrier. 5. The apparatus of claim 4, wherein the multiplexed signal comprises an identification signal for distinguishing the type of the multiple signal within the vertical retrace interval, and the apparatus includes means for extracting the identification signal (131), and selection means for selecting the main and multiple signals ( 137) and means (148) for controlling said selection means in accordance with said identification signal. Main signal generating means (601) for generating a television signal as a main signal at the transmitting side; Multiple signal generating means 602 for generating multiple signals; Signal separation means (6) for separating the multiple signals into first and second multiple signals; Time multiplexing means (1) for time multiplexing the second multi-signal and the main signal to obtain a time-multiple main signal; Carrier generating means (4) for generating a first carrier; First amplitude modulating means (2) for amplitude-modulating the carrier wave by means of a time multiplexing main signal to obtain a first residual side band and an amplitude modulated signal; Phase shifting means (5) for phase shifting the first carrier by 90 degrees to obtain a second carrier; Second amplitude modulating means (7) for amplitude-modulating the second carrier by a first multiple signal to obtain both sidebands and amplitude modulated signals; An inverse Nyquist filter (8) having Nyquist characteristics for filtration of both sideband amplitude modulation signals to obtain a second residual sideband, amplitude modulation signal; Adding means (9) for adding the first and second residual side bands and amplitude modulated signals to obtain multiple signals; Transmission means (58) (59) for transmitting the multiple signal, and a Nyquist filter (33) for filtering the multiple signal at the receiving side; Filtering means (37) for filtering the multiple signals to eliminate interference from the main signal to the multiple signals; Carrier reproducing means (35) for reproducing a first carrier from multiple signals; Main signal detecting means (34) for detecting a main signal from the multiple signals passing through the Nyquist filter by synchronous detection using a reproduced first carrier; Phase shifting means (38) for converting a phase of a regenerated first carrier by 90 degrees to obtain said second carrier; First multi-signal detection means (39) for detecting a first multiple signal from a phase shifting means with a synchronous detector using said second carrier; Time multiplexing means (36) for time multiplexing the main signal into the original main signal and the second multiplexing signal; And a signal synthesizing means (40) for synthesizing the first multiple signal and the second multiple signal to obtain one multiple signal. 7. The apparatus of claim 6, wherein the frequency characteristics of the inverse Nyquist filter (8) and Nyquist filter (33) are substantially symmetrical with respect to the frequency of the first carrier. Means (125) for generating an identification signal for identifying the type of the multiple signal at the transmitting side, means (129) for overlapping the identification signal in a vertical retrace period of the multiple signal, and at the receiving side And a means (148) for extracting said identification signal from said received multiple signal and means (148) for controlling said main and multiple signal processing means (137) in accordance with the extracted identification signal. First time axis decompressing means 113 for expanding in time axis a first portion of the wide aspect ratio television signal corresponding to an aspect ratio of 4: 3 to obtain a first television signal; Second time extension means (116) (119) for stretching other than the first portion of the wide aspect ratio television signal to obtain a second television signal; Frequency axis multiplexing means (13) for multiplexing said first and second television signals on a frequency axis to obtain a multiple television signal; And an apparatus for transmitting a wide aspect ratio television signal equivalent to an image displayed on a television screen having an aspect ratio wider than 4: 3 comprising multiple television signal transmitting means (58) (59). 10. The apparatus of claim 9, further comprising: carrier generating means (4) (5) for generating first and second carriers having the same frequency and having a phase difference of 90 degrees; Signal separating means (6) for separating the second television signal into first and second multiple television signals; Time multiplexing means (1) for time multiplexing the first television signal and the second multiplex signal to obtain a main signal; First amplitude modulating means (2) for amplitude modulating a first carrier with the main television signal to obtain a first residual side band, amplitude modulated television signal; Second amplitude modulating means (7) for amplitude-modulating the second carrier by means of a second multi-television signal to obtain both side-wave, amplitude-modulated television signals; An inverse Nyquist filter (8) having Nyquist characteristics for filtering the both sideband and amplitude modulated television signals to obtain a second residual sideband amplitude modulated television signal; And addition means (9) for adding first and second residual sideband amplitude modulated television signals to obtain said multiple television signal. Means (31) (32) for receiving the multi-television signal in claim 9; Signal separation means (44) for separating the received multi-TV signal into first and second television signals; First time base compression means (134, 135, 136) for temporally compressing a first television signal to obtain the first portion of the wide aspect ratio television signal; Second time base compression means (138) for time-base compression of a second television signal to obtain the wide aspect ratio television signal; And means (137) for combining into a first portion and a second portion. 12. The apparatus of claim 11, further comprising: a Nyquist filter (33) for filtering multiple television signals; Filtering means (37) for filtering the multi-TV signal to remove interference from a main signal to the multi-signal; Carrier reproducing means (35) (38) for reproducing first and second carriers of the multi-television signal having the same frequency and having a phase difference of 90 degrees; First detecting means (34) for detecting a main television signal from the multiple television signal passed through the Nyquist filter using the reproduced first carrier; Second detection means (39) for detecting a first multiple signal by using the reproduced second carrier; Time multiple canceling means (36) for time multiplexing the main television signal into a first television signal and a second multiplexed signal; And a signal separation means (40) comprising signal synthesizing means (40) for synthesizing the first multiple signal and the second multiple signal to obtain the second television signal. First time axis extension means (113) for extending a time axis first portion of said wide aspect ratio television signal corresponding to aspect ratio 4: 3 to obtain a first television signal; Second time extension means (116) (119) for extending a portion other than the first portion of the wide aspect ratio television signal to obtain a second television signal; Carrier generating means (4) (5) for generating first and second carriers having the same frequency and 90 degree difference in phase from each other (6) Signal separation means (6) for separating the second television signal into first and second multi-TV signals ; Superimposing means (51) for superposing a second multi-TV signal on the first television signal; Time multiplexing means (1) for obtaining a main signal by time multiplexing the first television signal and the second multiplex signal; First amplitude modulating means (2) for amplitude modulating a first carrier wave by means of said main television signal to obtain a first residual side band amplitude modulated television signal; Second amplitude modulating means (7) for amplitude-modulating a second carrier according to said second multi-television signal to obtain a double sideband amplitude modulated television signal; An inverse Nyquist filter (8) having Nyquist characteristics for filtering the two sideband amplitude modulated television signals to obtain a second residual sideband amplitude modulated television signal; And adding means (9) for adding said first and second residual sideband amplitude modulated television signals to obtain said multi-TV signal; And a wide aspect ratio television signal processing apparatus corresponding to an image displayed on a television screen having a wide aspect ratio of 4: 3 or more, comprising means (58) (59) for transmitting the multiple television signal. A signal buffer (buffer) means (511) (512) for causing a scrambler (overlapped) (51) to exchange a line by means of the second multiple signal line; A timing generator (514) for controlling said buffer means; And an overlapping means (513) for overlapping control signals for overlapping resolution at a receiving side. 14. The apparatus of claim 13, further comprising: signal buffer means (511, 512) for exchanging left and right half lines of said second multiplexed signal; A timing generator (514) for controlling said buffer means; And a redundancy means (513) for overlapping control signals for overlapping at the fisheries side. 14. The apparatus of claim 13, further comprising: signal buffer means (511, 512) for exchanging polarities of the multiple signals by lines; A timing generator (514) for controlling said buffer means; And a redundancy means (513) for overlapping control signals for overlapping at the receiving side. Means (31) (32) for receiving the multi-television signal in claim 13; A Nyquist filter 33 for filtering multiple television signals; Filter means 37 for filtering a multi-television signal to remove interference from the main signal to the multiple signal; Carrier regeneration means (35) (38) for reproducing the first and second carrier signals of the multi-television signal having the same frequency and 90 degrees out of phase with each other; First detecting means (34) for detecting a main television signal from the multi-television signal passing through the Nyquist filter using the reproduced first carrier; Second detecting means (39) for detecting a first multiple signal by using the reproduced second carrier; Time multiplexing means (36) for time multiplexing the main television signal into a first television signal and a second multiplex signal; Descrambling means (52) for de-overlapping the first multiplexed signal to obtain a demultiplexed first multiplexed signal (52); Signal synthesizing means (40) for synthesizing the first multiplex signal and the second multiplex signal to obtain a second television signal; 14. An apparatus for receiving a multi-television signal transmitted from the apparatus of claim 13, comprising means (121) for synthesizing said wired compact ratio television signal from a first television signal and a second television signal. First time base extending means 113 for stretching the first portion on the time axis of the wide aspect ratio television signal corresponding to aspect ratio 4: 3 to obtain the first television signal; Second time base stretching means (116) (119) for stretching a portion other than the first portion of the wide aspect ratio television signal to obtain a second television signal; Carrier generating means (4) (5) for generating first and second carriers having the same frequency and different phase differences from each other by 90 degrees; Signal separating means (6) for separating the second television signal into first and second multiple television signals; Time multiplexing means (1) for time multiplexing the first television signal and the second multiplex signal to obtain a main signal; First amplitude modulating means (2) for amplitude modulating a first carrier wave according to said main television signal to obtain a first residual side band, amplitude modulated television signal; Second amplitude modulating means (7) for amplitude-modulating a second carrier in response to said second multiple television signal to obtain a first bilateral band amplitude modulated television signal; Third amplitude modulating means (55) for amplitude modulating the second carrier according to the second multi-television signal to obtain a second bilateral band amplitude modulated television signal; Signal selecting means 56 for selecting a first bilateral band amplitude modulated television signal and a second bilateral band amplitude modulated television signal to obtain a bilateral band signal; An inverse Nyquist filter (8) having a Nyquist characteristic for filtering the two sideband signals to obtain a second residual sideband, amplitude modulated television signal; And adding means (9) for adding first and second residual sideband amplitude modulated television signals to obtain a multi-television signal; A device for transmitting a wide aspect ratio television signal corresponding to a display image on a television screen having a wide aspect ratio of 4: 3 or more, comprising means (58) (59) for transmitting a multiple television signal. Means (31) (32) for receiving the multi-TV signal; A Nyquist filter (33) for filtering the multi-TV signal; Filtering means (37) for filtering said multiple television signal to remove interference for multiple signals from a main signal; Carrier reproducing means (35) (38) for reproducing from the multi-television signal first and second carriers having the same frequency and a phase difference of 90 degrees; First detecting means (34) for detecting a main television signal from the multiple television signal passing through the Nyquist filter using the reproduced first carrier; Filtering means (37) for filtering the multi-television signal for removing interference to obtain a modulated first multi-signal; Second detecting means (39) for detecting a multi-signal A from the modulated first multi-signal using a reproduced second carrier; Third detecting means (57) for detecting a multiple signal B from said modulated first multiple signal using said reproduced second carrier; Signal selecting means (58) for selecting a first multiple signal from both of the multiple signals A and B; Time multiplexing means (36) for time multiplexing the main television signal into a first television signal and a second multiplexed signal; Signal synthesizing means (40) for synthesizing the first multiplex signal and the second multiplex signal to obtain a second television signal; 19. An apparatus for receiving a multi-television signal transmitted from the apparatus of claim 18, comprising means (121) for synthesizing said wide-adapt ratio television from a first television signal and a second television signal.

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