JPH01231486A - Multiplex signal processor - Google Patents

Abstract

PURPOSE:To attain the transmission of a video signal with high definition and magnified aspect ratio by separating a video signal into multiplex signals including information and applying frequency multiplexing as a satellite broadcast signal. CONSTITUTION:A main video signal separated by a main sub video signal separation means 8 is inputted to a frequency multiplex means 4, the sub video signal is converted into a signal proper to frequency multiplex by utilizing a voice subcarrier signal of a voice subcarrier modulation means 3, enters a multiplex modulation signal generation means 7 applying frequency conversion to a higher frequency band than that of the voice subcarrier and the result is outputted as a multiplex modulation signal. Then the signal is inputted to the frequency multiplex means 4, where the signal is subjected to frequency multiplex with the main video signal and the voice subcarrier to generate a modulation signal, and after a frequency multiplex main carrier angular modulation means 5 modulates the main carrier, the result is outputted from a terminal 6 as a satellite broadcast signal. Thus, the video signal with high definition and magnified aspect ratio is transmitted.

Description

[Detailed description of the invention] Industrial applications The present invention can be used for satellite broadcasting and satellite communications.

The present invention relates to a multiplex signal processing device.

Conventional technology In conventional satellite broadcasting, the audio subcarrier is placed at 5.73 MHz, so the video signal is approximately 4.5 MHz, and the video signal and audio subcarrier are frequency multiplexed and used as the main modulation signal. The carrier wave was transmitted by angle modulating it. Regarding this, please refer to Satellite Broadcast Receiver (Part 1 Target Rating) Satellite Broadcast Receiving Technology Survey Report, Part 1, Foundation, Radio Technology Association (
(June 1982).

Hereinafter, with reference to the drawings, the process from generation to reproduction of the conventional satellite broadcasting modulation signal described above will be described.

FIG. 36 is a diagram showing transmission and reception of conventional satellite broadcasting. An audio signal is input from terminal 1, and a video signal is input from terminal 9, and the audio signal is converted from an analog signal to a digital signal by audio modulation signal converter 2, and is supplied to audio subcarrier modulator 3 as a PCM signal. 4-phase PSK
After modulation, it enters the frequency multiplexing section 154. The frequency of the audio subcarrier is 5.73MHz, and its occupied frequency bandwidth is 1.73MHz.
The 0 frequency multiplexer 154, which is 3 MHz, uses 4-phase PSK.
The modulated audio subcarrier and the video signal are frequency multiplexed to become a modulated signal, which enters the main carrier angle modulator 5.

The angle-modulated main carrier wave is output from the terminal 6.

The angle-modulated main carrier wave enters the main carrier wave terminal 10 and is demodulated by the main carrier wave demodulator 11 to reproduce a modulated signal. The reproduced modulated signal is frequency-separated into a video signal and an audio subcarrier by a modulated signal separation section 153, and the video signal is outputted from a terminal 18. On the other hand, the audio subcarrier demodulator 13
After demodulation, the audio signal is converted from a digital signal to an analog signal by an audio signal reproducing section, and then taken out from a terminal 17.

FIG. 37 is a diagram showing the spectrum of a conventional modulation signal, and the video signal exists up to 4.5M)tz.
The audio subcarrier has a bandwidth of 1 centered at 5.73 MHz.
．． 3 Ml (has a z distribution.

Problems to be Solved by the Invention However, in the above modulation method, the video signal is
．． It can only transmit up to 5 MHz, and if it is extended beyond that, the sidebands of the audio subcarrier exist in the range of approximately 5 MHz to 6.4 MHz, so the spectrum overlaps and causes significant interference. Recently, however, with the development of high image quality technology, improvements in resolution and expansion of aspect ratio are being considered, and for this purpose it is necessary to expand the frequency band and increase the amount of information in the video signal. For this purpose, band compression methods MUSE and MAC have been developed as methods for transmitting high-definition signals. Regarding this, please refer to NIKKEI [!LECTRONIC3] 1
987.11.2 (Nα433) p p 189
-212, Nirakei Electronics (N[KE
I ELECTRONIC3) 1987.8.10 (
427) pp. 97-112. However, since these systems cannot be received by conventional satellite broadcasting receivers, it is not possible to enjoy the images while these broadcasts are being performed. Therefore, there was a need for a signal transmission device that would allow conventional reception without interfering with conventional receivers, and would also be able to achieve higher definition and larger aspect ratios.

SUMMARY OF THE INVENTION An object of the present invention is to provide a multiplex signal processing device that can transmit video signals of high definition and enlarged aspect ratio without interfering with conventional satellite broadcast receivers.

! Means for Solving Problem i In order to solve the above problem, the multiplex signal processing device of the present invention combines a video signal with the same video signal as in the conventional transmission system and a multiplex signal containing information on high definition or enlarged aspect ratio. The multiplexed signal is frequency-multiplexed with the video signal and audio subcarrier as in the conventional method.

At this time, the multiplexed signal is placed in a higher frequency band than the audio subcarrier as a multiplexed modulation signal by frequency conversion.

The modulated signal thus generated is transmitted as a satellite broadcast signal by angle modulating the main carrier wave. During reception, the main carrier of the satellite broadcast signal is demodulated to extract the modulated signal, which is frequency-separated into a video signal, an audio subcarrier, and a multiplex modulated signal. The multiplexed signal reproduced from the multiplexed modulated signal is combined with the video signal to produce a high-definition or enlarged aspect ratio video signal and output. With the above configuration, it is possible to transmit a video signal with higher definition and an enlarged aspect ratio than the conventional video signal using the conventional transmission method.

Operation: By using the above-described method, the present invention does not cause interference that poses a practical problem to conventional receivers, and has good compatibility with conventional receivers. Furthermore, it is effective as a new transmission path that can carry not only a part of the video signal but also image information, such as motion information, as a multiplexed signal.

Embodiment Hereinafter, a multiplex signal processing apparatus according to an embodiment of the present invention will be described with reference to the drawings.

In FIG. 1, an audio signal enters from a terminal 1 and is encoded by audio modulation signal converting means 2 into digital audio to be transmitted as a satellite broadcasting signal. Furthermore, the audio subcarrier is PSK modulated by digital audio by the audio subcarrier modulation means 3 and input to the frequency multiplexing means 4 . On the other hand, the video signal is manually inputted from the terminal 9 and input to the main/sub video signal separation means 8 which separates the main video signal having the same bandwidth and aspect ratio as the conventional signal and the other sub video signals. The signal is manually inputted to the frequency multiplexing means 4, and the sub-video signal is frequency-multiplexed using the reference frequency signal that creates the sampling frequency of the audio modulation signal conversion means 4 and the audio subcarrier signal of the audio subcarrier modulation means 3. The received signal enters the multiplex modulation signal generating means 7 which converts the frequency into a signal suitable for the audio subcarrier and converts the frequency to a higher frequency band than the audio subcarrier, and outputs it as a multiplex modulation signal. Thereafter, the modulated signal is inputted to the frequency multiplexing means 4 and is frequency multiplexed with the aforementioned main video signal and audio subcarrier to generate a modulated signal. Thereafter, it is output from terminal 6 as a satellite broadcast signal. Furthermore, at the time of reception, this satellite broadcasting signal enters the terminal 10, where the modulated signal is taken out by the main carrier demodulating means 11, and enters the modulated signal separating means 12 which frequency-separates the main video signal, the multiplex modulated signal, and the audio subcarrier. The main video signal enters the main and sub-video signal synthesizing means 16, and the multiplex modulated signal enters the audio subcarrier of the audio subcarrier demodulating means 13 and the audio signal reproducing means 1.
The signal enters multiple modulation signal demodulation means 15 which takes out the sub-picture signal using the PCM bit clock signal of 4. Thereafter, the sub-picture signal enters the main and sub-picture signal combining means 16. The main and sub-video signal synthesis means 16 synthesizes the main and sub-video signals and reproduces the video signal with high definition and enlarged aspect ratio.
Output from Further, the audio subcarrier enters the audio subcarrier demodulating means 13 and reproduces the audio modulated signal.
In this embodiment, the main video signal and the audio signal have the same frequency arrangement as the conventional one, as shown in 0 or more, which is reproduced as an audio signal at 4 and output from the terminal 17, and only the multiplex modulation signal has a higher frequency band than the audio subcarrier. Since the spectrum is arranged in , the multiplex modulation signal and the conventional signal can be separated by a filter, simplifying the circuit configuration. Furthermore, conventional receivers can play conventional video and audio, making them compatible.

FIG. 3 shows a block diagram of the audio modulation signal conversion means 2 and the audio carrier modulation means 3. The audio signal input from terminal 1 is A
It is encoded by the D conversion circuit 19.

For encoding, a reference frequency generated by a reference frequency generation circuit 20 that generates a frequency that is an integral multiple of the sampling frequency is divided by a frequency conversion circuit signal 41 to obtain a sampling frequency of 32 KHz.
Or get 48KHz. The encoded digital audio signal is multiplexed with additional signals such as independent data, control codes, and frame synchronization signals in a signal multiplexing circuit 21, and the audio subcarrier from an audio subcarrier generation circuit 23 is modulated in a 4-phase PSK modulation circuit 22. The signal is supplied to frequency multiplexing means 4 at the next stage. At this time,
The reference frequency and the audio subcarrier signal are supplied to the multiplex modulation signal generating means 7.

Furthermore, the audio modulation signal may be time-division multiplexed within the conventional video signal and transmitted.

FIG. 4 shows the audio subcarrier demodulation means 13 and the audio reproduction means 14.
The audio subcarrier modulated by the digital audio signal from the modulated signal separation means 12 enters the 4-phase PSK demodulation circuit 24, and is demodulated into a PCM signal by the signal supplied from the audio subcarrier regeneration circuit 25, and is demodulated into a PCM signal by the PCM signal processing circuit. Enter 26. Pit clock regeneration circuit 27 for PCM signal processing
The PCM signal is decoded by the clock generated by the DA
The conversion circuit 28 converts it into an analog audio signal and outputs it from the terminal 17. At this time, the audio subcarrier is supplied to the multiplexed signal demodulating means 15 from the audio subcarrier reproducing circuit 25, and the pit clock is supplied from the PCM signal processing pit clock reproducing circuit 27.

FIG. 5 shows a block diagram of the main and sub-video signal separating means 8 when the video signal includes a signal with higher definition than before. Since the video signal input from the terminal 9 includes a high-definition signal, it is a signal 34 with a band of 5.5 MHz in FIG. 7(a).
Among these, the main video signal of 4.5 MHz, which is the same band as the video signal of conventional satellite broadcasting, is extracted by the low-pass filter 29 shown in FIG. A bandpass filter 30 extracts it as a sub-picture signal. Signal 35 in FIG. 7(b) is a main video signal, and signal 36 is a sub-video signal. After being separated into main and sub-picture signals, the main picture signal is supplied to the frequency multiplexing means 4, and the sub-picture signal is supplied to the multiplex modulation signal generating means 7, respectively. Furthermore, an audio modulation signal may be time-division multiplexed within the main video signal. FIG. 6 shows a block diagram of the main and sub-video signal separating means 8 when the video signal has an aspect ratio of 5:3, which is higher than the conventional one. The video signal input from the terminal 9 is a signal 34 with a band of 5.5 MHz shown in FIG. 7(a), which enters the enlarged signal separation circuit 31 and is separated from the signal with an aspect ratio of 4:3 shown in FIG. 8(a). It is separated into other signals. A signal with an aspect ratio of 4:3 is the same as a conventional video signal and is used as a main video signal. Other signals are defined as sub-picture signals. The main video signal is input to the 5/4 time expansion circuit 32 and the time axis is expanded by 574 times, resulting in a frequency band of 41
This results in a main video signal with a bandwidth of 4.5M7, which is 5 times as large as the conventional signal. When the other signals are input to the 5-fold time expansion circuit 33 and subjected to 5-fold time axis expansion, the frequency band is increased by 115 times, resulting in a sub-picture signal with a band of 1.1 MHz as shown in FIG. 8(d). Signal 37 in Figure 8) is the main video signal.
(v) Signal 38 in the figure is a sub-picture signal. After separating the video signal into main and sub-video signals, the main video signal is sent to the frequency multiplexing means 4, and the sub-picture signal is sent to the multiplex modulation signal generation means 7.
is supplied to

FIG. 9 shows a first embodiment for generating multiplex modulated signals.

In order to convert the sub-picture signal, which is a high-definition signal, as explained in FIG. The frequency is converted by the reference signal which is the audio signal sampling frequency generated from the reference frequency generation circuit 20 constituting the audio signal. As shown in FIG. 10(a), the reference frequency is 12.288 MHz, so that the sub-video signal is converted from the audio subcarrier from 6.79 MHz to 7.79 MHz as shown in FIG. 10(b). The signal is also converted to a high frequency band, and after removing unnecessary signals by a filter 40, it is supplied to the frequency multiplexing means 4 as a multiplex modulated signal.

The multiple modulated signal is frequency multiplexed with the main video signal and the audio subcarrier by a frequency multiplexing means to generate a modulated signal having the frequency arrangement shown in FIG. 10(C).

In addition, in order to convert the sub-picture signal, which is the aspect ratio enlargement signal explained in FIG.
0 (d) As shown in the figure, for example, the audio subcarrier 5.73MH
z or 1/2 of that frequency, 2.87M7, and convert the frequency from 4.63MHz to 5.z as shown in FIG. 10(e).
73MH2 sub-picture signal, and performs similar frequency conversion using the reference frequency as explained below in FIG.
0(f) Figure multiplex modulation signal, 6.56M7 to 7.66
M7 band, which does not overlap with the audio subcarrier (can be converted to a higher frequency band).Then, the frequency multiplexing means 4 generates a modulated signal with the frequency arrangement shown in Figure 1'O(g). .

Also, in video signals with a larger aspect ratio than usual, only the high-frequency components of the side panel may be transmitted.
In that case, as in the above case, the high-frequency components within the side panel are extracted and transmitted as a sub-picture signal.

FIG. 11 shows a configuration for demodulating the multiplex modulated signal explained in FIG. 9. The multiplex modulated signal extracted from the modulated signal separation means 12 that separates the main video signal, audio subcarrier, and multiplexed modulated signal is the clock of the pit clock reproducing circuit 27 constituting the audio signal reproducing means 14, e.g.
．． The frequency is converted to 288MHz by the frequency conversion circuit 42, and the frequency is converted to 288MHz.

(e) Converted to the signal shown in the figure. After eliminating unnecessary signals by the filter 41, if the sub-picture signal is a high-definition signal, it is supplied as is to the main/sub-picture signal synthesizing means 16 to reproduce the video signal. However, if the aspect ratio is enlarged, the signal is first frequency-converted using the audio subcarrier or a signal of 1/2 of its frequency to convert it into a signal of 1.1 MHz or less, and then is supplied to the main and sub-video signal synthesis means 16. . As described above, according to this embodiment, a sub-video signal is converted into a frequency band higher than the audio sub-carrier to generate a multiplex modulated signal, and furthermore, in order to reproduce the sub-video signal from the signal, a sample of the audio signal is required. Because it uses the reference frequency used for conversion, it is highly accurate without adding a new oscillator for conversion, and the pit clock signal used in conventional audio signal reproduction circuits can be used as is during demodulation. It has the characteristic that it does not grow in size.

FIG. 12 shows a second embodiment for generating multiplex modulated signals. In order to convert the sub-picture signal, which is a high-definition signal, as explained in FIG.
The frequency is once converted to a lower frequency band by a frequency conversion circuit 44 using a carrier wave generated for transmitting an audio signal.

FIG. 13(a) shows the frequency relationship among the main video signal, sub-video signal, and audio subcarrier. Furthermore, the 13th (
b) The figure shows the frequency spectrum of the sub-video signal frequency-converted by the audio sub-carrier.

Thereafter, the signal is supplied to a frequency conversion circuit 46 through a filter 45 that eliminates unnecessary signals. On the other hand, the reference frequency generated from the reference frequency generation circuit 20 is converted to the reference frequency conversion circuit 43.
Then, by dividing and multiplying the frequency by -1, it is converted to a frequency that is an integral multiple of the audio sampling frequency, for example, 8, 19 MHz, 6.14 MHz.
) (Z, supplied to the frequency conversion circuit 46. 13th (b)
fsv shown in the figure is the signal supplied from the reference frequency conversion circuit 43, and 1. The sub-picture signal is converted into a frequency band of f2 to become a multiplex modulation signal. r
When 5v = 8.19 MHz, f = 6.96M)
lz, f2 = 7.96 MI &, fsv = 6.1
．． At 6 MHz, f 1 = 6.39 MHz.

f, = -7.39 MHz, which is converted into a frequency band higher than the audio subcarrier.The multiplex modulated signal output from the frequency conversion circuit 46 is filtered by a filter 47 to eliminate unnecessary signals, and then sent to the frequency multiplexing means 4. is supplied to The frequency-multiplexed modulated signal has the spectrum shown in FIG. 13(d).

Furthermore, in order to convert the sub-picture signal, which is the aspect ratio enlargement signal explained in FIG. Since the signal is already below 1.1 M) (z), there is no need for frequency conversion using the audio subcarrier in FIG. 13(a), and it is sufficient to input it from the filter 45 in FIG. In a video signal that is larger than usual, only the high-frequency components of the side panel may be transmitted, and in that case as well, the high-frequency components within the side panel are extracted and transmitted as a sub-picture signal, as described above and recursively.

FIG. 14 shows a configuration for demodulating the multiplex modulated signal explained in FIG. 12. The multiplex modulated signal extracted from the modulated signal separation means 12 for separating the main video signal, audio subcarrier, and multiplex modulated signal enters the frequency conversion circuit 49. On the other hand, the bit clock (2,0
The output signal from the bit clock frequency conversion circuit 48 that converts the frequency to fsv, which is an integral multiple of the audio sampling frequency, is supplied to the frequency conversion circuit 49 from the bit clock reproduction circuit 27 that reproduces the frequency (48 MHz). Thereby, the multiplex modulated signal is frequency converted to a lower frequency band. It is the 13th (
b) Diagram. After that, when the multiplex modulated signal includes a high-definition signal, the frequency is converted by the audio subcarrier of the audio subcarrier generation circuit 25 in the frequency conversion circuit 51, and the sub video signal is obtained via the filter 52, and the main and sub video signal is synthesized. Means 16 is supplied. However, in the embodiment of 0 or more in which when the multiplex modulation signal includes a signal with an enlarged aspect ratio, it is supplied as is to the main and sub-video signal combining means 16, the frequency of the signal used for frequency conversion during reproduction can be accurately reproduced. ,
Since the audio subcarrier and bit clock signals that are reproduced by a conventional receiver are used, there is an advantage that no new reproduction circuit is required.

FIG. 15 shows a third embodiment for generating multiplex modulated signals. In order to convert the sub-picture signal, which is a high-definition signal, as explained in FIG. The signal is converted into the frequency band shown in FIGS. 16(a) to 16° C. by the audio subcarrier supplied from the subcarrier. This is similar to the second embodiment described in FIG.

As a result, the sub-video signal changes from 0.23MHz to 1.23M.
converted to Hz. Thereafter, unnecessary signals are removed by a filter 55, and then the signal is supplied to an amplitude modulation circuit 56 as a modulation signal. On the other hand, the video subcarrier of the amplitude modulation circuit 56 is
Using the color subcarrier forming the video signal, the color subcarrier output from the color subcarrier generation circuit 58 is converted to the multiplier circuit 5.
A signal multiplied by 3 is supplied. At this time, the frequency of the video subcarrier is doubled to 7.16M1 (z. Only the multiplex modulated signal is filtered from the output of the amplitude modulation circuit 56 to the filter 5.
7 and supplied to the frequency multiplexing means 4. 16th (
b) fsv in the figure is the video subcarrier supplied to the amplitude modulation circuit 56, and the multiplex modulated signal generated by amplitude modulating this video subcarrier with the subvideo signal is shown in FIG. 16(C). This signal is DSB and the frequency band is 5.93 MHz
The frequency becomes 8.39MHz. In this case, the lower sideband may overlap the spectrum of the audio subcarrier and cause interference. In addition, if there is a restriction on the transmission band of satellite broadcasting, the 16th
@Raise the passband of the filter 57 so that it becomes a VSB or SSB spectrum as shown in the figure. In this way, as shown in FIG. 16(e), the multiple modulation signal is frequency-multiplexed in a frequency band higher than the voice subcarrier. For example, f1=6.4MHz so as not to overlap the spectrum of the voice subcarrier. , f2=8.39MHz VSB
It can be done. When converting the sub-picture signal, which is the aspect ratio enlargement signal explained in FIG. Since the frequency is converted to a low frequency of 1.1 MHz, it is sufficient to immediately supply the signal to the amplitude modulation circuit 56 via the filter 55 without frequency conversion using the audio subcarrier. The highest frequency f2 of the multiplex modulation signal at that time is 8.26M1 (z.In addition, in a video signal with a larger aspect ratio than usual, only the high frequency components of the side panel may be transmitted, and in that case, the same as above is applied. Then, the high-frequency components in the side panel are extracted and transmitted as a sub-video signal.

FIG. 17 shows a configuration for demodulating the multiple modulated signal explained in FIG. 15. The multiple modulated signal extracted from the modulated signal separation means 12 for separating the main video signal, audio subcarrier, and multiple modulated signal is supplied to the amplitude modulated signal demodulation circuit 60. On the other hand, the multiplex modulated signal is simultaneously output by the amplitude limiting circuit 64.
After suppressing the amplitude modulation component, the signal is supplied to the video subcarrier reproducing circuit 59. Video subcarrier regeneration circuit 59
Then, the video subcarrier having the same frequency as the carrier included in the multiplex modulated signal is regenerated to demodulate the amplitude modulated signal - Circuit 6
0. The amplitude modulated signal demodulation circuit 60 reproduces the multiplexed signal contained in the video subcarrier by synchronous detection, eliminates unnecessary signals by the filter 61, and then supplies the signal to the frequency conversion circuit 62. The demodulated signal is filtered by the filter 61
After removing unnecessary signals, the signal is converted into a frequency band from 0.23 MHz to 1.23 MHz as shown in FIG. 16(b).

The audio subcarrier reproduced by the audio subcarrier reproducing circuit 25 is supplied to the frequency conversion circuit 62 .

Thereby the multiplexed signal is from 4.5 MHz to 5.5 MHz.
The signal is frequency-converted to the frequency band z, resulting in a sub-picture signal in the frequency band shown in FIG. 16(a). The filter 63 is for eliminating unnecessary signals generated during frequency conversion.

If the multiplex modulation signal is a high-definition signal, it is supplied as is to the main and sub-video signal combining means 16 to reproduce the video signal. However, in the case of a signal with an enlarged aspect ratio, the output of the filter 61 is supplied to the main and sub-video signal synthesis means 16. According to this embodiment, the sub-picture signal is amplitude-modulated into a video sub-carrier, and By converting the video subcarrier, which is the amplitude modulation of the video signal, into a higher frequency band than the audio subcarrier and generating a multiplex modulated signal, it is possible to transmit multiplexed signals without disturbing the audio subcarrier. By using twice the frequency of the color subcarrier for the carrier wave, harmonic interference of the color subcarrier caused by secondary distortion in video circuits is less likely to occur.
Furthermore, since the signal is transmitted in both sidebands, the S/N ratio can be improved.

Furthermore, since the video subcarrier is reproduced from the multiplex modulated signal during demodulation, it is possible to easily reproduce a carrier wave with reduced orthogonal distortion during demodulation, so that the demodulation circuit can be simplified.

FIG. 18 shows a fourth embodiment for generating multiplex modulated signals. In order to convert the sub-picture signal, which is a high-definition signal, as explained in FIG. Since the operation is the same as in FIG. 15 until the frequency is converted by the audio subcarrier supplied from the subcarrier, a detailed explanation will be omitted.

Thereafter, unnecessary signals are removed by a filter 55, and then the signal is supplied to an amplitude modulation circuit 56 as a modulation signal.

On the other hand, the video subcarrier of the amplitude modulation circuit 56 is frequency-divided and multiplied by the reference frequency conversion circuit 66 using the signal of the reference frequency generation circuit 20 constituting the audio modulation signal conversion means 2, and then supplied to the amplitude modulation circuit 56. do.

When the reference frequency is 12.288M)tz, it is multiplied by 7712 to become 7.14M7. The amplitude modulated multiplicity i1 signal is supplied to the frequency multiplexing means 4 in the same manner as described in FIG. As described above, according to this embodiment, the video subcarrier of the multiplex modulated signal is generated from the reference frequency of the audio modulated signal conversion means. Since the reference frequency is a signal for generating a sampling frequency used for PCM encoding an audio signal, a divided frequency already exists. Therefore, to generate the video subcarrier of the multiplex modulation signal, it is sufficient to use a part of the fixed frequency division, for example, by dividing the frequency by 12, and then multiplying the signal by a fixed frequency, for example, by 8, and the scale of the circuit can be greatly expanded. In addition, the receiving circuit in the case of the fourth embodiment may be the circuit shown in FIG.

FIG. 19 is a diagram showing a specific example of the amplitude modulation signal demodulation circuit 60 and the video subcarrier regeneration circuit 59 shown in FIG. 17. The multiple modulated signal input from the modulated signal separation means 12 is sent to the amplitude limiting circuit 64 to suppress the amplitude modulation component and make the amplitude constant.
The video subcarrier reproducing circuit 59 is entered. The video subcarrier regeneration circuit 59 includes a phase synchronization circuit consisting of a phase comparison circuit 67, an oscillation circuit 69, and a loop filter 68, and a π/2 phase box path 7.
The oscillation circuit 69 operates in frequency and phase synchronization with the output signal of the amplitude limiting circuit 64. Its oscillation output is π/2
It is input to the phase circuit 70 and phase-shifted, and the double-balanced mixer 7!
Enter. Further, the oscillation signal from the oscillation circuit 69 is input to the double balanced mixer 72 . Double balanced mixer 71.
Since the oscillation signals supplied to the mixers 72 are orthogonal to each other, the outputs from the respective mixers are orthogonal outputs of the multiplexed modulated signals. The output signals are combined by a combining circuit 73 and supplied to a filter 61. According to this embodiment, a phase synchronization circuit is used to reproduce a video subcarrier from a video modulation signal, and the video subcarrier is Since a circuit for demodulating at right angles to the phase synchronization circuit is also added, the demodulated output can be kept constant even if the phase of the phase synchronization circuit or the π/2 phase circuit changes.

FIG. 20 shows a fifth embodiment for generating multiplex modulated signals. In order to convert the sub-picture signal, which is a high-definition signal explained in FIG. The frequency is converted in the same manner as in FIG. 15.

Thereby, the frequency band of FIG. 21(a) is converted into the frequency band of FIG. 21(b). As a result, the sub video signal is 0.23M
Hz to 1.23MHz. Thereafter, after eliminating unnecessary signals with a filter 75, an angle modulation circuit 76
is supplied as a modulation signal to On the other hand, the angle modulation circuit 76
The video subcarrier uses the color subcarrier forming the video signal to supply a signal obtained by multiplying the color subcarrier output from the color subcarrier generation circuit 79 by a multiplier circuit 78. At this time, the frequency of the video subcarrier is 7.16 M when multiplied by 2.
Hz, and when multiplied by 3 it becomes 10.74M)tz.

A filter 77 selects only the multiplexed modulated signal from the output of the angle modulation circuit 76 and supplies it to the frequency multiplexing means 4.

fsv in FIG. 21(C) is the video subcarrier supplied to the angle modulation circuit 76, and the multiplex modulation signal generated by angle-modulating this video subcarrier with the subvideo signal is shown in FIG. 21(C1). The frequency band of the signal becomes a spectrum centered on the video subcarrier.The multiplex modulated signal is frequency multiplexed with the main video signal and the audio subcarrier by the frequency multiplexing means 4, and the second
1 It will look like the same figure. On the other hand, the angle modulation signal has a carrier-to-noise ratio (C/N) that is higher than a signal-to-noise ratio (
There is a degree of FM improvement that improves S/N. F of angle modulation
The M improvement degree is expressed as follows. Assuming the maximum frequency deviation Δf, the maximum frequency of the modulation signal fm, and the occupied bandwidth B, (the following is a margin) S/N improvement degree = ...... (11 B =, 1 f + 2 ・fm - (2) becomes.

In order to avoid overlapping the spectrum of the audio subcarrier, the video carrier must have a frequency of 7 or 16 MHz during doubling.
Therefore, the difference is 0.76 MHz, and since it is 10.74 MHz when the frequency is multiplied by 3 weeks, the difference becomes 4.34 MHz.

On the other hand, the occupied bandwidth fB and the allowable value when the main carrier wave is angle-modulated with a modulated signal obtained by angle-modulating and multiplexing the video signal can be expressed by the following formula. 1/2 of the occupied bandwidth of only the video signal is fb,
If the modulation index of the video subcarrier is m, and the frequency shift of the main carrier by the video subcarrier is fsd, then... (3) The above is the 1981 Electrical Engineering Council Report, Volume 5 "Space Communication System "Technical conditions necessary for effective use and management of radio waves".

[8 is 27 MHz for satellite broadcasting, and may be 36 MHz for communication satellites 0 For example, when the video subcarrier is 7.16 MHz, the frequency shift of the video subcarrier is 0.52 MHz, and the sub video signal is If is 0.5MHz, S
/N improvement is 7 dB from equation (1), and the main carrier occupied bandwidth at that time is about 26 MHz from equation (3). Also, the amplitude value of the video subcarrier is 0.44v from the frequency deviation of the main carrier, and the S/N is degraded by about 7dB, so
When the sub-picture signal is reproduced, the deterioration is offset by the degree of FM improvement. When the video subcarrier is 10.74MHz, the subvideo signal is 1.23MHz, and the frequency shift of the video subcarrier is 1.5MHz, the FM improvement level is 8 if multiplexed without overlapping with the audio subcarrier. The result is .6dB. Therefore, the frequency shift of the main carrier wave can be reduced accordingly, and truncation interference to the main video signal can be suppressed. When converting the sub-picture signal, which is the aspect ratio enlargement signal explained in FIG.
d) As shown in the figure, since the frequency has been converted to a low frequency of 1.1 MHz, it is sufficient to immediately supply it to the angle modulation circuit 76 via the filter 75 without converting the frequency with the audio subcarrier. Since the frequency bandwidth of the multiplex modulation signal is narrower than that of the high-definition signal, the degree of FM improvement is slightly better.

Also, in video signals with a larger aspect ratio than usual, only the high-frequency components of the side panel may be transmitted.
In that case as well, the high-frequency components within the side panel are extracted and transmitted as a sub-picture signal, as described above.

As described above, according to this embodiment, the amplitude of the subcarrier is lowered to suppress the frequency shift of the main carrier, thereby reducing interference to the main video signal, and angle-modulating the S/N deteriorated video signal. It has been improved by doing so.

Furthermore, although the video subcarrier is used by multiplying the color printing carrier used when generating the video signal, a video subcarrier with an independent frequency may be generated depending on the frequency band of the subvideo signal and the setting of the FM improvement degree.

FIG. 22 is a diagram showing the sixth embodiment. In order to convert the sub-picture signal, which is a high-definition signal, as explained in FIG. The frequency is converted in the same manner as in FIG. 15.

Thereby, the frequency band is converted into the frequency bands shown in FIGS. 21(a) to 21(a). As a result, the sub video signal is 0.23MH
z to 1.23M) (converted to z. After that, unnecessary signals are removed by the filter 81, and then the angle modulation circuit 82
is supplied as a modulation signal to On the other hand, the angle modulation circuit 82
The video subcarrier is generated by dividing and multiplying the reference frequency of the reference frequency generation circuit 20 that generates the reference frequency of the audio modulation signal conversion means 2 by the reference frequency conversion circuit 84 and then converting the reference frequency to the angle modulation circuit 8.
Supply to 2. At this time, the reference frequency is 12.288MH
If it is z, multiply it by 2/3 and it will be 8.19M) [It is in z. At this time, as explained in FIG. 20, according to equation (1), if the frequency deviation of the video subcarrier is 1.12 MHz and the band of the sub video signal is 1.23 MHz, the FM improvement degree is 5.6 d.
It becomes B. Thereafter, only the multiplexed modulated signal from the angle modulation circuit 82 is selected by the filter 83 and supplied to the frequency multiplexing means 4.

rsv in FIG. 21(b) is a video subcarrier supplied to the angle modulation circuit 82, and FIG. 21(C) shows a multiplex modulation signal generated by angle-modulating this video subcarrier with a subvideo signal. The frequency band of this signal becomes a spectrum centered on the video subcarrier. The multiple modulated signal is frequency multiplexed with the main video signal and the audio subcarrier by frequency multiplexing means 4, and then
1(6) It becomes as shown in the figure.

When converting the sub-picture signal, which is the aspect ratio expansion signal explained in FIG. Since the frequency is converted to a low frequency of 1.1 MHz, the frequency band of the multiplex modulated signal at that time can be immediately supplied to the angle modulation circuit 82 via the filter 81 without frequency conversion using the audio subcarrier. Since the band width is narrower than that for high-definition signals, the degree of FM improvement is slightly better.

Also, in video signals with a larger aspect ratio than usual, only the high-frequency components of the side panel may be transmitted.
In that case, as in the above case, the high-frequency components within the side panel are extracted and transmitted as a sub-picture signal.

As described above, according to this embodiment, the amplitude of the subcarrier is lowered to suppress the frequency shift of the main carrier, thereby reducing interference to the main video signal, and angle-modulating the S/N deteriorated video signal. It has been improved by doing so.

Furthermore, although the video subcarrier is used by frequency converting the basic frequency used for PCM encoding of the audio signal, a video subcarrier with an independent frequency may be generated depending on the frequency band of the subvideo signal and the setting of the FM improvement degree. Sometimes.

FIG. 23 shows a configuration for demodulating the multiplex modulated signal explained in FIGS. 20 and 22. The multiple modulated signal extracted from the modulated signal separation means 12 that separates the main video signal, audio subcarrier, and multiple modulated signal is supplied to the angle modulated signal demodulation circuit 85 .

The angle modulation signal demodulation circuit 85 reproduces the multiplexed signal contained in the video subcarrier, removes unnecessary signals with the filter 86, and then supplies the signal to the frequency conversion circuit 87. After removing unnecessary signals from the demodulated signal in the filter 88, the demodulated signal is sent to the 21st
(b) 0.23MHz to 1.23M as shown in the figure
The audio subcarrier reproduced by the audio subcarrier reproducing circuit 25 is supplied to the zero frequency conversion circuit 87 which converts the frequency band into the Hz frequency band. Thereby, the multiplexed signal is frequency converted to a frequency band of 4.5MHz to 5.5MHz, and the second
1 (a) The sub-video signal is in the frequency band shown in the figure. Filter 88 is for eliminating unnecessary signals generated during frequency conversion. If the multiplex modulation signal is a high-definition signal, it is supplied as is to the main and sub-video signal combining means 16 to reproduce the video signal. However, if the signal has an enlarged aspect ratio, the output of the filter 86 is transferred to the main/sub video signal synthesizing means 16.
supply to. As described above, according to this embodiment, the sub-picture signal is angle-modulated into a video sub-carrier, and the video sub-carrier obtained by angle-modulating the sub-picture signal is further converted into a frequency band higher than that of the audio sub-carrier, thereby producing a multiplex modulated signal. By generating this, multiplexed signals can be transmitted without interfering with the audio subcarrier. Furthermore, by angularly modulating the video subcarrier, the S/N deterioration of the subvideo signal can be improved even if the frequency shift of the main carrier due to the multiple modulation signal of the main carrier is lowered.

FIG. 24 shows an embodiment of the angle modulation signal demodulation circuit 85 shown in FIG. 23. The multiplexed modulated signal input from the modulated signal separation means 12 enters the phase comparator 89 and is compared in frequency and phase with the oscillation signal of the oscillator 92. The result is then sent to the loop filter 90 and the DC
The signal is supplied to the amplifier 91 and fed back to the oscillator 91 again after eliminating high-frequency signals. Therefore, they constitute a phase-locked circuit. Therefore, since the oscillator 91 follows the instantaneous frequency of the multiplex modulated signal, the output of the DC amplifier 92 becomes the demodulated signal. Therefore, the output of the DC amplifier 92 is supplied to the filter 88. As described above, in this embodiment, since the angle modulation signal demodulation circuit is constituted by a phase synchronization circuit, semiconductor integration is easy. However, similar performance can be achieved by using an alternative pulse counting circuit.

FIG. 25 is a diagram showing the seventh embodiment. The sub-picture signal inputted from the main sub-picture signal separating means 8 is passed through the frequency converting circuit 93 to which the audio sub-carrier from the audio sub-carrier generating circuit 25 is supplied, and the sub-picture signal input from the main sub-picture signal separating means 8 passes through the frequency conversion circuit 93 shown in FIGS. 26(a) to 26(b). 23
It becomes a multiplexed signal converted from MHz to 1.23MHz band. Furthermore, the multiplexed signal is separated into two bands by filters 94 and 95. Among them, the lower band signal is supplied to an amplitude modulation circuit 96.

Further, the high band signal is supplied to the frequency conversion circuit 97, and the reference frequency from the reference frequency generation circuit 20 is divided and multiplied by the reference frequency conversion circuit 104.
7 to convert the frequency of the multiplexed signal.1 For example, multiplying the reference frequency by 15/128 yields 1.44 MHz, resulting in the frequency arrangement shown in Figure 26 (C), and as a result of frequency conversion, the signal is (d) Converted to low frequency as shown in the figure. Thereafter, unnecessary signals are removed by a filter 98 and the signal is then supplied to an amplitude modulation circuit 99. Amplitude modulation circuit 9
6.99 is supplied with a signal obtained by multiplying the color subcarrier generated by the color carrier generation circuit 59 by the multiplier circuit 103,
The amplitude modulation circuit 99 transfers the signal to a π/2 phase shift circuit 102.
The amplitude modulation circuits 96 and 99 perform modulation orthogonally to each other.Then, the outputs of the amplitude modulation circuits 96 and 99 are combined in a synthesis circuit 100, and unnecessary signals are filtered through the filter 1 (1
1 and is converted from FIG. 26(d) to FIG. 26 (FIG. 61).
(A modulation signal as shown in FIG. f1 is obtained.) Furthermore, if the signal has an enlarged aspect ratio, the sub-picture signal from the main and sub-picture signal separation means 8 may be directly supplied to the filters 94 and 95.

Furthermore, in a video signal having a larger aspect ratio than usual, only the high-frequency components of the side panel may be transmitted as a sub-video signal.

FIG. 27 shows a configuration for demodulating multiplex modulated signals in the seventh embodiment. The multiplexed modulated signal is separated by the modulated signal separation means 12 and supplied to the amplitude modulated signal demodulation circuit 105 . On the other hand, the video subcarrier of the multiplex modulated signal is regenerated by the amplitude limiting circuit 117 and the video subcarrier reproducing circuit 114, and is supplied to the amplitude modulated signal demodulating circuit 105 for synchronous detection.

Further, the multiplex modulated signal is supplied to the amplitude modulated signal demodulation circuit 106, and the output of the video subcarrier regeneration circuit 114 is
The signal phase-shifted by the phase shift circuit 107 performs orthogonal synchronous detection. The output of the amplitude modulation signal demodulation circuit 105 is supplied to the frequency conversion circuit 115 after removing unnecessary signals by the filter 1 (15).

In the frequency conversion circuit 115, the pit crotter regeneration circuit 27
The signal is divided by the focus clock frequency conversion circuit 116,
After being multiplied, it is applied and the multiplexed signal is frequency converted. As a result, the spectrum shown in FIG. 26(C) is obtained. The frequency-converted multiplexed signal is supplied to a frequency multiplexing circuit 110 via a filter 111. On the other hand, the multiplexed signal which is the demodulated signal of the amplitude modulation signal demodulation circuit 106 is fed to the frequency multiplexing circuit 110 via the filter 10B. The frequency multiplexing circuit 110 reproduces the multiplexed signal as shown in FIG. 26(b), converts it to the frequency shown in FIG. 26(a) by a frequency converter 112, and obtains a demodulated signal via a filter 113. At this time, frequency conversion is performed using the audio subcarrier. Since the amplitude modulation demodulation circuit performs synchronous detection, orthogonal signals can be eliminated and only the signals on the detection axis are reproduced. but,
If the signal has an enlarged aspect ratio, the frequency multiplexing circuit 110
The output is supplied to the main and sub-video signal combining means 16.

As described above, according to this embodiment, each of the two separated sub-picture signals undergoes orthogonal amplitude modulation on the video sub-carrier, so the two signals are independent.

Furthermore, compared to the embodiment shown in FIG. 15, when the video subcarriers have the same frequency, twice the transmission band is secured, and the frequency can be used effectively. Furthermore, even if the same sub-picture signal is transmitted, the frequency of the video sub-carrier can be lowered, so that the occupied bandwidth of the main carrier can be narrowed.

FIG. 28 is a diagram showing the eighth embodiment. Here, the reference frequency of the reference frequency generation circuit 2° explained in FIG. 25 is frequency-converted and used as a video subcarrier for the amplitude modulation circuit 99°96. Reference frequency conversion circuit 119, frequency conversion circuit 97, amplitude modulation circuit 96.99, and π/2 phase shift circuit 1
02 performs the same operation as in FIG. 25, so a detailed explanation will be omitted. The reference frequency is turned into a video subcarrier signal by the reference frequency conversion circuit 118 and supplied to the amplitude modulation circuit 96 and the π/2 phase shift circuit 102, and then supplied to the amplitude modulation circuit 99. It is multiplied by 12 times or 8/12 times. In the above embodiment, part of the conventional circuit configuration can be used by using a reference frequency that uses the frequency conversion of a part of the band of the sub-video signal and the video sub-carrier of the amplitude modulation circuit for the same audio sampling. It has the feature of simplifying the circuit.

FIG. 29 is a diagram showing the ninth embodiment. The sub-picture signal inputted from the main sub-picture signal separating means 8 is passed through the frequency converting circuit 120 to which the audio sub-carrier from the audio sub-carrier generating circuit 25 is supplied, and the sub-picture signal input from the main sub-picture signal separating means 8 passes through the frequency converting circuit 120 to which the audio sub-carrier is supplied. 2
It becomes a multiplexed signal converted from 3 MHz to 1.23 MHz band. Furthermore, the multiplexed signal is separated into two bands by filters 121 and 122. The division frequency at this time is assumed to be f3. Among them, the lower band signal is supplied to the angle modulation circuit 124. Also, for high band signals, the frequency conversion circuit 1
23, the reference frequency from the reference frequency generation circuit 20 is divided and multiplied by the reference frequency conversion circuit 127, and then supplied to the frequency conversion circuit 123 to frequency convert the multiplexed signal. For example, if you multiply the reference frequency by 15/128, it will be 1.4.
4 MHz, resulting in the frequency arrangement shown in FIG. 30(C), and as a result of frequency conversion, the signal is converted to a lower frequency band as shown in FIG. 30(d). Thereafter, unnecessary signals are removed by a filter 125 and then the signal is supplied to an amplitude modulation circuit 126. The amplitude modulation circuit 126 is supplied with the angle-modulated video subcarrier, which is amplitude-modulated by the multiplexed signal that is the output signal from the filter 125, and then sent to the frequency multiplexing means 4 via 129 to eliminate unnecessary signals. is supplied to This results in a spectrum centered at fsv in FIG. 30(e), which is frequency multiplexed with the main video signal and the audio subcarrier by the frequency multiplexing means 4, resulting in the frequency arrangement shown in FIG. 3o(f). The division frequency of the sub-picture signal is divided so that the occupied bandwidth is the same for angle modulation and amplitude modulation.

For example, when the video subcarrier fsv is 7.17M7, and the division frequency f3 is 0.53M7, the bandwidth during amplitude modulation is 1.4M7, and the frequency deviation of angle modulation is 0.5MHz. Then, the bandwidth is 1.1 MHz. The bandwidth of amplitude modulation increases due to angle modulation, but since it is 0.25MHz above and below, it does not overlap with the audio subcarrier.
The FM improvement degree at this time is 6.6 dB, which is 20th above 0.
According to formulas (1), (2), and (3) used in the explanation of the figure, if the signal is an aspect ratio enlargement signal, the sub-picture signal from the main and sub-picture signal separation means 8 is directly passed through the filter 94.95.
It is good to be supplied with.

Also, in video signals with a larger aspect ratio than usual, only the high-frequency components of the side panel may be transmitted.
In that case as well, the high-frequency components within the side panel are extracted and transmitted as a sub-picture signal, as described above.

FIG. 31 shows a configuration for demodulating multiplex modulated signals in the ninth embodiment. The multiplexed modulated signal is separated by the modulated signal separation means 12 and supplied to the angle modulated signal demodulation circuit 130. Here, the multiplex modulated signal is demodulated and supplied to a frequency conversion circuit 138 via a filter 137. The angle modulation signal demodulation circuit 130 is the phase shift synchronization circuit explained in FIG. Since the oscillation signal of the oscillator 92 is frequency phase-shift synchronized with the video subcarrier, it is supplied to the amplitude modulation signal demodulation circuit 131 after being brought into phase with the video subcarrier via the π/2 phase shift circuit 140 .

The amplitude modulation signal demodulation circuit 131 is supplied with multiple modulation signals and performs synchronous detection. Amplitude modulation signal demodulation circuit 131
After removing unnecessary signals from the filter 132, the output is supplied to the frequency multiplexing circuit 133.
At B, the signal from the pit clock regeneration circuit 27 is frequency-divided and multiplied by the bit clock frequency conversion circuit 139 and then supplied to convert the frequency of the multiplexed signal. As a result, the 30th (C
) The 6-frequency converted multiplexed signal having the spectrum shown in the figure is supplied to a frequency multiplexing circuit 133 via a filter 136. In the frequency multiplexing circuit 133, the multiplexed signal as shown in FIG. 30(b) is regenerated and converted into the frequency shown in FIG.
5 to obtain a demodulated signal. At this time, frequency conversion is performed using the audio subcarrier.

If the aspect ratio is enlarged, the output of the frequency multiplexing circuit 133 is supplied to the main and sub-video signal combining means 16.
As described above, according to this embodiment, each of the two separated sub-video signals undergoes amplitude modulation and angle modulation on the video sub-carrier, so the two signals are independent. Also, compared to the embodiment of FIG. 15, when the video subcarriers have the same frequency, 2
Since twice the transmission band is secured, the frequency can be used effectively. Furthermore, even if the same sub-video signal is transmitted, the frequency of the video sub-carrier can be lowered, so the occupied bandwidth of the main carrier becomes narrower, and when angle modulated,
It can be expected to improve the FM and has the characteristics of being able to transmit even at a low carrier wave level. Furthermore, it can be applied to QAM etc. in the case of digital transmission.

FIG. 32 is a diagram showing the tenth embodiment.

Here, the reference frequency of the reference frequency generation circuit 20 explained in FIG. 29 is frequency-converted and used as the video subcarrier of the angle modulation circuit 124. The reference frequency conversion circuit 141, the frequency conversion circuit 123, and the angle modulation circuit 124 operate in the same manner as in FIG. 29, so detailed explanations will be omitted. The reference frequency is turned into a video subcarrier signal by the reference frequency conversion circuit 142 and is supplied to the angle modulation circuit 124 . For example, in embodiments of 0 or more in which the reference frequency conversion circuit 142 multiplies the frequency by 7712 or 8/12, the frequency conversion of a part of the sub-video signal band and the video sub-carrier of the angle modulation circuit are used for the same audio sampling. By using a reference frequency, a part of the conventional circuit configuration can be used, and the circuit can be simplified.

FIG. 33 is a diagram showing an embodiment of the modulated signal separating means 12. The modulated signal output from the main and subcarrier demodulation means 11 is distributed into three by a power distribution circuit 143. The first modulation signal has a cut-off frequency of 4.5MH to obtain the main video signal.
z low-pass filter 144. The second modulated signal is supplied to a bandpass filter 145 having the same bandwidth as the multiplexed modulated signal to obtain a multiplexed modulated signal.

The third modulated signal is fed to a bandpass filter 146 with a center frequency of 5.73 MHz and a bandwidth of 1.3 MHz to obtain the audio subcarrier. Thereafter, the modulated signals are sent to the main video signal combining means 16 for the main video signal, and the multiple modulated signal to the multiplex modulated signal demodulation means 15 to obtain the sub video signal.
, the audio subcarrier is supplied to audio subcarrier demodulation means 13 to obtain an audio signal. Here, the power distribution circuit includes, for example, a resistor distribution circuit.

FIG. 34 is a diagram of an embodiment of the main and sub-video signal combining means 16 when the multiplexed signal is a high-definition signal.

The sub-picture signal supplied from the multiple modulation signal demodulation means 15 is supplied to a power combining circuit 147. On the other hand, the main video signal is supplied from the modulated signal separating means 12 to the power combining circuit 147. Since the high-definition signal was originally frequency-divided, power synthesis is sufficient.After that, unnecessary signals are removed by a filter 148, and then a video signal is output from the terminal 18. Here, the power combining circuit includes a resistance combining circuit and an adder using an operational amplifier.

FIG. 35 is a diagram of an embodiment of the main and sub-video signal combining means 16 when the multiplexed signal is a signal with an enlarged aspect ratio. The sub-picture signal supplied from the multiple modulation signal demodulation means 15 is 5
The signal is supplied to a double time compression circuit 149. On the other hand, the main video signal is sent from the modulation signal separation means 12 to the 5/4 time compression circuit 150.
is supplied to

Since the aspect ratio enlargement signal was originally divided into time bases, these signals are inserted into both sides of the screen by the video time base synthesis circuit 151. Thereafter, unnecessary signals are removed by a filter 152, and then a video signal is output from the terminal 18. Here, the video time axis synthesis circuit is a circuit that synthesizes screens using memory.

Effects of the Invention As is clear from the above description, the multiplex signal processing device of the present invention separates a video signal into the same video signal as in the conventional transmission method and a multiplex signal containing information on high definition or enlarged aspect ratio. The multiplexed signal is frequency-multiplexed with the video signal and audio subcarrier as in the conventional method.

At this time, the multiplexed signal is placed in a higher frequency band than the audio subcarrier as a multiplexed modulation signal by frequency conversion.

The modulated signal thus generated is transmitted as a satellite broadcast signal by angle modulating the main carrier wave. During reception, the main carrier of the satellite broadcast signal is demodulated to extract the modulated signal, which is frequency-separated into a video signal, an audio subcarrier, and a multiplex modulated signal. The multiplexed signal reproduced from the multiplexed modulated signal is combined with the video signal to produce a high-definition or enlarged aspect ratio video signal and output. With the above configuration, it is possible to transmit a video signal with higher definition and an enlarged aspect ratio than the conventional video signal using the conventional transmission method, and it does not cause any interference that would pose a practical problem to the conventional receiver. It also improves compatibility with conventional receivers. Furthermore, it is effective as a new transmission path that can carry not only a part of the video signal but also image information such as motion information and text information as a multiplexed signal.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a multiplex signal processing device showing the steps from generation to reproduction of a satellite broadcasting signal common to all embodiments of the present invention, and FIG. 2 is a block diagram of a satellite broadcasting signal common to all embodiments of the present invention. FIG. 3 is a block diagram of the audio modulation signal conversion means and the audio subcarrier modulation means of the multiplex signal processing device common to all embodiments of the present invention.
FIG. 4 is a block diagram of the audio subcarrier demodulation means and audio signal reproducing means of the multiplex signal processing device common to all embodiments of the present invention, and FIG. 5 shows the main and sub-video signals when the video signal includes a high-definition signal. Separation is frequency separation.The block diagram of the main and sub-video signal separation means of the multiplex signal processing device represents the absolute truth that separation is frequency separation.
FIG. 6 is a block diagram of the main and sub-video signal separation means of a multiplex signal processing device showing an embodiment in which the sub-video signal is separated by time axis expansion when the video signal includes a signal with an enlarged aspect ratio. When the video signal includes a high-definition signal, the main and sub video signal separation is frequency separation.A frequency spectrum diagram showing an embodiment of a multiplex signal processing device. A frequency spectrum diagram showing an embodiment of a multiplex signal processing device that separates video signals by time axis expansion. FIG. FIG. 10 is a block diagram of a multiplex modulation signal generation means of a multiplex signal processing device that generates a multiplex modulation signal by frequency conversion. FIG. 11 is a frequency spectrum diagram when frequency conversion is performed to generate a multiplex modulated signal.
FIG. 12 is a block diagram of a multiple modulated signal demodulating means of a multiplex signal processing device that reproduces a sub-picture signal by converting the frequency of a multiple modulated signal using a pit clock of an audio signal reproducing means in the embodiment of FIG.
The figure shows a second embodiment of the present invention, and shows multiple modulation signal generating means of a multiplex signal processing device which generates a multiplex modulation signal by converting the frequency of a sub-video signal using an audio subcarrier and a reference frequency signal of the audio modulation signal converting means. FIG. 13 is a frequency spectrum diagram when a sub-video signal is frequency-converted using the audio sub-carrier and the reference frequency signal of the audio modulation signal converting means to generate a multiplex modulation signal in the second embodiment of the present invention. , FIG. 14 shows a second embodiment of the present invention of a multiplex modulated signal demodulating means of a multiplex signal processing device which reproduces a sub-picture signal by converting the frequency of a multiplex modulated signal using an audio subcarrier and a pit cropper of the audio signal reproducing means. FIG. 15 is a block diagram of a third embodiment of the present invention, in which a sub-video signal is frequency-converted using an audio sub-carrier, and then amplitude-modulated into a color sub-carrier to generate a multiple modulated signal. FIG. 16 is a block diagram of a signal generating means, in which a sub-video signal is frequency-converted 1 using an audio sub-carrier and then amplitude-modulated into a color sub-carrier to generate a multiplex modulated signal in the third embodiment of the present invention. The spectrum diagram, FIG. 17, shows a multiplexed signal in which a multiplexed modulation signal generated by amplitude modulating a color subcarrier is demodulated and frequency-converted using an audio subcarrier to reproduce a subvideo signal in the third embodiment of the present invention. FIG. 18, a block diagram of the multiple modulated signal demodulating means of the processing device, is the fourth embodiment of the present invention.
1 is a block diagram of a multiplex modulation signal generating means of a multiplex signal processing device that frequency-converts a sub-video signal using an audio subcarrier and then amplitude-modulates it to a reference frequency signal of an audio modulation signal converting means to generate a multiplex modulation signal in the embodiment of FIG. , FIG. 19 shows the fourth embodiment of the present invention.
In this embodiment, the multiple modulated signal of the multiplex signal processing device demodulates the multiple modulated signal generated by amplitude modulating the reference frequency signal of the audio modulation signal converting means, and then performs frequency conversion using the audio subcarrier to reproduce the sub video signal. Block diagram of demodulation means, 20th
The figure shows a block diagram of a multiplex modulation signal generating means of a multiplex signal processing device according to a fifth embodiment of the present invention, which frequency-converts a sub-video signal using an audio subcarrier and then angle-modulates the sub-video signal into a color subcarrier to generate a multiplex modulation signal. 21 is a frequency spectrum diagram when a sub-video signal is frequency-converted using an audio sub-carrier and then angularly modulated to a color sub-carrier to generate a multiplex modulated signal in the fifth embodiment of the present invention; FIG. The figure shows a sixth embodiment of the present invention in which a sub-video signal is frequency-converted using an audio sub-carrier and then angularly modulated into a reference frequency signal of an audio modulation signal converting means to generate a multiplex modulated signal. FIG. 23 is a block diagram of the modulation signal generation means, in which the multiple modulation signal generated by angle modulating the color subcarrier or the reference frequency signal of the audio modulation signal conversion means is demodulated in the fifth to sixth embodiments of the present invention. rear,
A block diagram of a multiplex modulation signal demodulation means of a multiplex signal processing device that reproduces a sub-video signal by frequency converting an audio subcarrier;
FIG. 24 is a diagram showing an embodiment of the angle modulation signal demodulation circuit of FIG. 23, and FIG. 25 is a diagram showing a seventh embodiment of the present invention. FIG. 26 is a block diagram of a multiplex modulation signal generating means of a multiplex signal processing device that divides the band and performs amplitude modulation on color subcarriers orthogonally to generate a multiplex modulation signal, which is a seventh embodiment of the present invention. Figure 27 is a frequency spectrum diagram when a sub-video signal is frequency-converted using an audio sub-carrier and then divided into two bands, each of which is orthogonally amplitude-modulated onto a color sub-carrier to generate a multiplex modulated signal. A multiplex modulated signal of a multiplex signal processing device that demodulates a multiplex modulated signal generated by orthogonal amplitude modulation to a color subcarrier in a seventh embodiment of the invention, and then performs frequency conversion using an audio subcarrier to reproduce a subvideo signal. A block diagram of the demodulation means, FIG. 28 is a diagram of the eighth embodiment in which the video subcarrier shown in FIG. 25 is generated from the reference frequency, and FIG. Multiplex modulation using a multiplex signal processing device that performs frequency conversion using a carrier wave, then further divides into two bands, one of which is angularly modulated to a color subcarrier, and then amplitude modulated using the other signal to generate a multiplex modulated signal. FIG. 30 is a block diagram of a signal generating means in a ninth embodiment of the present invention, in which a sub-video signal is frequency-converted using an audio sub-carrier, and then further divided into two bands, one of which is angularly modulated into a color sub-carrier. 31 is a frequency spectrum diagram when the other signal is amplitude-modulated to generate a multiplex modulated signal. In the ninth embodiment of the present invention, the color subcarrier is angle-modulated and then amplitude-modulated. A block diagram of a multiplex modulation signal demodulation means of a multiplex signal processing device that demodulates a multiplex modulation signal and then performs frequency conversion using an audio subcarrier to reproduce a subvideo signal. FIG. 32 is based on the video subcarrier in FIG. 29. A diagram of the tenth embodiment generated from the frequency, FIG. 33 is a block diagram showing an embodiment of the modulated signal separation means of the present invention,
FIG. 34 is a block diagram showing an embodiment of the main and sub-video signal synthesis means when the multiple modulation signal of the present invention is a high-definition signal, and FIG. 35 is a block diagram showing an embodiment of the multiple modulation signal of the present invention having an enlarged aspect ratio. FIG. 36 is a block diagram showing an embodiment of the main and sub-video signal synthesis means when the signal is a signal of
FIG. 2 is a spectrum diagram of a modulated signal of conventional satellite broadcasting. 1.6,9,10.17...Audio signal, 2...
...Audio modulation signal conversion unit, 3...Audio subcarrier modulation unit, 4...Frequency multiplexing unit, 5...
...Main carrier angle modulation unit, 7...Multiple modulation signal generation unit, 8...Main and sub-video signal separation unit, 11...
... Main carrier demodulation section, 12 ... Modulated signal separation section, 13 ... Audio subcarrier modulation section, 14 ...
. . . Audio signal reproducing section, 15 . . . Multiple modulation signal demodulation section, 16 . . . Main/sub video signal synthesis section, 1
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Claims (1)

[Scope of Claims] (1) Audio modulation signal converting means for converting an audio signal into an audio modulation signal; audio subcarrier modulation means for modulating an audio subcarrier with the audio modulation signal; main and sub-picture signal separating means for separating into video signals; multi-modulated signal generating means for converting the sub-picture signal into a multiple modulated signal having a higher frequency than the audio sub-carrier; A multiplex signal processing device comprising frequency multiplexing means for frequency multiplexing audio subcarriers to generate a modulated signal, and main carrier modulation means for generating a signal in which a main carrier is modulated with the modulated signal. (2) The multiplex signal processing device according to claim (1), wherein the video signal has a wider frequency band than a normal NTSC signal. (3) The multiplex signal processing device according to claim (1), wherein the video signal has a larger aspect ratio than a normal NTSC signal. (4) The multiplex signal processing device according to claim (1), wherein the sub-picture signal is a signal for high definition. (5) The multiplex signal processing apparatus according to claim (1), wherein the sub-picture signal is a signal for expanding an aspect ratio. (6) The multiplex modulation signal processing device according to claim 1, wherein the multiplex modulation signal generating means includes means for frequency converting the sub-picture signal with a predetermined signal to generate the multiplex modulation signal. (7) The multiplexed signal processing apparatus according to claim 6, wherein the multiplexed modulated signal generating means comprises means for frequency converting a reference frequency used during audio signal processing to obtain a predetermined signal. (8) The multiplex signal processing device according to claim (7), wherein the sub-picture signal is a signal for high definition. (9) The multiplex modulated signal generating means comprises means for frequency converting the sub-picture signal using the first predetermined signal and the second predetermined signal to generate the multiplex modulated signal. Processing equipment. (10) According to claim (9), the multiplex modulation signal generating means comprises means for converting the audio subcarrier into the first predetermined signal, and means converting the frequency of the color subcarrier into the second predetermined signal. multiple signal processing device. (11) The multiplex modulation signal generation means includes means for converting an audio subcarrier into a first predetermined signal, and means for converting a reference frequency used during audio signal processing into a second predetermined signal. The multiple signal processing device according to item (9). (12) The multiplex signal processing device according to claim 1, wherein the multiplex modulation signal generating means comprises means for modulating the video subcarrier with the subvideo signal. (13) The multiplexed signal processing device according to claim 12, wherein the multiplexed modulated signal generating means comprises means for amplitude modulating the video subcarrier with the subvideo signal. (14) The multiplex signal processing device according to claim 12, wherein the multiplex modulation signal generating means comprises means for angle modulating the video subcarrier with the subvideo signal. (15) The multiplex signal processing device according to claim 12, wherein the multiplex modulation signal generating means comprises means for amplitude modulating and angle modulating the video subcarrier with the subvideo signal. (16) The multiplexed signal processing device according to claim 15, wherein the multiplexed modulated signal generating means comprises means for separating the sub-picture signal into two signals. (17) The multiplexed signal processing apparatus according to claim 16, wherein the multiplexed modulated signal generating means comprises means for amplitude modulating and angle modulating the video subcarrier with the subvideo signal separated into two signals, respectively. (18) The multiplex signal processing device according to claim 12, wherein the multiplex modulation signal generating means comprises means for frequency converting the color subcarrier to obtain a video subcarrier. (19) The multiplexed signal processing apparatus according to claim 12, wherein the multiplexed modulated signal generating means includes means for frequency converting a reference frequency used during audio signal processing to obtain a video subcarrier. (20) The multiplexed signal processing apparatus according to claim 12, wherein the multiplexed modulated signal generating means comprises means for once converting the frequency of the sub-picture signal into a lower frequency band using a predetermined signal. (21) The multiplex signal processing device according to claim (20), wherein the predetermined signal is an audio subcarrier. (22) The main and sub-video signal separating means is characterized in that among the video signals having a frequency band wider than that of the normal NTSC signal, the same band as the normal NTSC signal is used as the main video signal, and the other bands are used as the sub-picture signal. The multiple signal processing device according to claim (1). (23) The main and sub-video signal separation means selects the normal NTSC signal from among the video signals with a wider aspect ratio than the normal NTSC signal.
2. The multiplex signal processing apparatus according to claim 1, further comprising means for separating and time-axis expanding a signal having the same aspect ratio as that of the signal as a main video signal and other signals as sub-picture signals. (24) main carrier demodulation means for demodulating the input signal to obtain a modulated signal; modulation signal separation means for separating the modulated signal into a main video signal, an audio subcarrier, and a multiplexed modulation signal; audio subcarrier demodulation means for reproducing;
Equipped with audio signal reproduction means for reproducing an audio signal from an audio modulation signal, multiple modulation signal demodulation means for reproducing a sub-picture signal from a multiplex modulation signal, and main and sub-picture signal synthesis means for synthesizing a main video signal and a sub-picture signal. A multiplex signal processing device that regenerates signals. (25) The multiplex signal processing device according to claim 24, wherein the video signal has a wider frequency band than a normal NTSC signal. (26) The multiple signal processing device according to claim 24, wherein the video signal has a larger aspect ratio than a normal NTSC signal. (27) The multiplex signal processing device according to claim (24), wherein the sub-picture signal is a signal for high definition. (28) The multiplex signal processing device according to claim (24), wherein the sub-picture signal is a signal for expanding an aspect ratio. (29) The multiplexed signal processing device according to claim 24, wherein the multiplexed modulated signal demodulation means comprises means for converting the frequency of the multiplexed modulated signal using a predetermined signal to reproduce the sub-picture signal. (30) The multiplex modulated signal processing apparatus according to claim 29, wherein the multiplex modulated signal demodulation means comprises means for frequency converting a reference frequency used during audio signal processing to obtain a predetermined signal. (31) The multiplex signal processing device according to claim (29), wherein the sub-picture signal is a signal for high definition. (32) The multiplex modulated signal demodulating means comprises means for converting the frequency of the multiplex modulated signal using the first predetermined signal and the second predetermined signal to reproduce the sub-picture signal. Processing equipment. (33) A claim in which the multiplex modulation signal demodulation means includes means for converting the reference frequency used during audio signal processing into a first predetermined signal, and means for converting an audio subcarrier into a second predetermined signal. The multiplex signal processing device according to item (32). (34) Claim (32) wherein the multiple modulation signal demodulation means comprises means for converting the frequency of the color subcarrier into a first predetermined signal and means for converting the audio subcarrier into a second predetermined signal.
The multiple signal processing device described above. (35) The multiplexed signal processing apparatus according to claim 24, wherein the multiplexed modulated signal demodulation means comprises means for demodulating the multiplexed modulated signal consisting of the modulated video subcarrier to reproduce the subpicture signal. (36) The multiplexed signal processing device according to claim 35, wherein the multiplexed modulated signal demodulation means comprises means for demodulating the multiplexed modulated signal consisting of the amplitude modulated video subcarrier to reproduce the sub-picture signal. (37) The multiplexed signal processing apparatus according to claim 35, wherein the multiplexed modulated signal demodulation means comprises means for demodulating the multiplexed modulated signal consisting of angle-modulated video subcarriers and reproduces the sub-picture signal. (38) The multiplexed signal processing apparatus according to claim 35, wherein the multiplexed modulated signal demodulation means comprises means for demodulating the multiplexed modulated signal consisting of the amplitude-modulated and angle-modulated video subcarrier to reproduce the sub-picture signal. (39) The multiplexed signal processing apparatus according to claim 35, wherein the multiplex modulated signal demodulation means comprises means for reproducing a sub-picture signal modulating a video subcarrier obtained by frequency converting a color subcarrier. (40) The multiplex modulated signal demodulating means comprises means for reproducing a sub-picture signal modulating a video subcarrier obtained by frequency converting a reference frequency used during audio signal processing. Signal processing device. (41) The multiplexed signal processing apparatus according to claim 35, wherein the multiplexed modulated signal demodulation means includes means for reproducing the sub-picture signal whose frequency has been once frequency-converted to a lower frequency band using a predetermined signal. (42) The multiplex signal processing device according to claim (41), wherein the predetermined signal is an audio subcarrier. (43) The main and sub video signal synthesis means is a means for frequency multiplexing the main video signal in the same band as the normal NTSC signal and the sub video signal in other bands to reproduce a video signal in a wider frequency band than the normal NTSC signal. 25. The multiplex signal processing device according to claim 24, comprising: (44) The main and sub-video signal synthesis means compresses the time axis of the main video signal having the same aspect ratio as the normal NTSC signal and the sub-picture signals of other signals, and synthesizes them to form the normal NTSC signal.
25. The multiplex signal processing apparatus according to claim 24, further comprising means for reproducing a video signal having a wider aspect ratio than the video signal.