JPH03289796A - Television video and sound signal transmission/reception equipment - Google Patents

Abstract

PURPOSE:To reduce the number of video and sound transmission lines, to narrow the band area of a transmission line, to facilitate signal processing, and to suppress signal deterioration by providing a first transmission means to transmit the luminance signal of a video signal, and a second transmission means to transmit the multiplex signal of a color difference signal and a sound signal. CONSTITUTION:A signal processing part 1 performs the signal processing of a transmission side, and applies the luminance signal to a first transmission line 10, and the color difference signal to a two-phase modulator 3, and the sound signal to frequency modulators 4-7 at every channel, and a sound control signal to an amplitude modulator 8. The amplitude modulator 8 performs the amplitude modulation of the sound control signal, and performs frequency multiplex by applying those signals to a mixer 9, and transmits it to a second transmission line 11. The luminance signal received from the first transmission line 10 is applied to a signal processing part B2, and a frequency multiplex signal received from the second transmission line B11 is applied to demodulators 12-17, and it is restored to the color difference signal, the sound signal, or the sound control signal, and is applied to the signal processing part B2, then, the signal processing of a reception side is performed. Thereby, it is possible to narrow the band area of the transmission line, to suppress the deterioration of the signal, to facilitate the signal processing, and to reduce the number of video and sound transmission lines.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to television equipment that transmits and receives television video and audio signals to and from other television equipment.

2. Description of the Related Art Conventionally, video signals and audio signals are transmitted and received between television devices using (1) a luminance signal Y and a color difference signal Pb.

Pr (or two-phase modulation color difference signal), audio signal, (2) R
, G, B, audio signals, (3) video multiplexed signals, audio signals, and (4) video/audio multiplexed signals.

For example, the case where the transmitted/received signal is (1) will be explained based on FIGS. 3 and 4. FIG. 3 is a block diagram showing a conventional television video/audio signal receiving apparatus and a receiving apparatus, and FIG. 4 is a spectrum diagram of a conventional transmitting/receiving signal. The signal processing C31 performs signal processing of the video and audio signal transmitting device of the transmitting television equipment, and transmits the luminance signal Y to the first transmission path C33.
, the color difference signal Pb is transmitted to the second transmission path D34, and the color difference signal Pb is transmitted to the second transmission path D34.
r to the third transmission path E35, and the two channels of audio signals to the fourth transmission path F36 and the fifth transmission path G3 for each channel.
Send to 7. Signal processing D32 receives the luminance signal Y from the first transmission path C33 and the color difference signal Pb from the second transmission path D34.
, the color difference signal Pr is received from the third transmission path E35, and the two-channel audio signal is received from the fourth transmission path F36 and the fifth transmission path G37, and the signal of the video and audio signal receiving device of the receiving side television equipment is received. Perform processing.

FIG. 4 (Shin represents the spectrum 41 of the luminance signal Y, the frequency band is fyS (b), and (C) represents the spectrum 42 of the color difference signal pb, and the spectrum 43 of Pr, respectively, the frequency band is fb .

It is fr. Further, (d) and (e) each represent the spectrum 44.45 of each channel of the two-channel audio signal, and the frequency band is fa.

Problems to be Solved by the Invention When the number of transmitted and received signals as described above is (1), the number of transmission paths is five. Furthermore, when a two-phase modulated color difference signal is used as the color difference signal, the number of transmission paths is four.

When the transmitted/received signal is (2), the number of transmission paths is 4 or more, similar to the case (1). This large number of transmission paths means that connections between devices are complicated. This becomes even more complicated as the number of audio signal channels increases and the number of transmission paths increases.

If the transmitted/received signal is (3) or (4), the transmitted/received signal is a video multiplexed signal, so the signal band is wide, and the transmission line must have a wide band.If the transmission line band is wide, transmission line loss etc. cause problems. This is particularly a problem when the video signal is originally a wide band signal, such as a high-vigilance signal. If the band of this video multiplexed signal is narrowed, signal processing will become complicated, such as in the case of an NTSC signal, and signal deterioration will occur when restoring the multiplexed signal.

The present invention eliminates the above-mentioned drawbacks by reducing the number of video and audio transmission paths between television equipment compared to the conventional method, narrowing the bandwidth of the transmission path, and making signal processing relatively easy. The present invention provides a device that can also reduce signal deterioration.

Means for Solving the Problems A video and audio signal transmitting device of a transmitting television device includes: a first transmitting means for transmitting a luminance signal of a video signal; a multiplexing means for multiplexing a color difference signal of a video signal and an audio signal; The video/audio signal receiving device of the receiving television equipment has a second transmitting means for transmitting the output signal of the multiplexing means, and a first receiving means for receiving the luminance signal of the video signal, and a color difference between the video signals. It has second receiving means for receiving a multiplexed signal in which a signal and an audio signal are multiplexed, and a restoring means for restoring this multiplexed signal into a color difference signal of a video signal and an audio signal.

According to the above-described configuration, the present invention includes a circuit for generating a multiplexed signal, a circuit for modulating a color difference signal, a circuit for modulating a plurality of channels of audio signals for each channel, and an audio control signal for identifying the format of transmitted audio. The band of a multiplexed signal obtained by frequency-multiplexing a signal obtained by modulating a color difference signal and an audio signal can be made smaller than the band of a luminance signal. Furthermore, the number of transmitted and received signals is two, and the number of transmission paths between television devices is two.

Embodiment Hereinafter, a television video and audio signal transmission system according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing a television video and audio signal transmitter and receiver according to an embodiment of the present invention, and FIG. 2 is a spectrum diagram of a transmitted and received signal according to an embodiment of the present invention. Signal processing A1 performs signal processing of the video and audio signal transmitting device of the transmitting television equipment, and transmits the luminance signal Y to the first transmission path AIO.
are transmitted through the output circuit A1B to the color difference signals Pb, Pr
to the two-phase modulator 3, and the audio signals of four channels to the FM modulator A4. FM modulator B5. FM modulator C6,
An audio control signal is applied to the FM modulator D7 and an AM modulator 8. The audio control signal identifies the format of the 4-channel audio signal. For example, it indicates the audio channel or audio format used, and indicates whether it is 2-channel stereo, 4-channel stereo, 2-channel stereo 2nd channel, 1 mono channel, 2 mono channels, or Represents n audio formats (n is an integer) such as a combination of stereo and mono.

In the two-phase modulator 3, the color difference signals Pb and Pr are two-phase modulated,
FM modulator A4. FM modulator B5. FM modulator C6,F
The M modulator D7 FM modulates the four channels of audio signals using different carrier waves for each channel, and the AM modulator 8
Then, the audio control signals are AM modulated, and these signals are applied to the mixer 9 and frequency multiplexed. This frequency multiplexed signal is transmitted to the transmission path Bll via the output circuit B19.

The spectra of the signals transmitted to the transmission path AIO and the transmission path Bll are as shown in Fig. 2 (a) and (b), respectively.The band of the spectrum 21 of the luminance signal is the spectrum of the fy1FM modulated 4-channel audio signal. are 23 to 26, and the carrier wave frequencies are f1 to f4. Further, the spectrum of the two-phase modulated color difference signal is 22, and the carrier wave is fc.

The band ry of the luminance signal Y is 20M7, and the color difference signals Pb and Pr
If both bands are 4 MHz, the band of the signal in which the color difference signal and the audio signal are frequency-multiplexed will be 20 Mtz or less.

The luminance signal Y is received from the first transmission line AIO via the input circuit A2B and applied to the signal processing B2. The frequency multiplexed signal received from the second transmission line Bll through the input circuit B29 is transmitted to the demodulators A13, B14. Demodulator C1
5, demodulator D16. Demodulator E17. The signal is applied to the demodulator F12, restored to the color difference signal Pb, color difference signal Pr, 4-channel audio signal, and audio control signal, and applied to the signal processing B2. Signal processing B2 performs signal processing of the video/audio signal receiving device of the receiving television equipment, and the output circuits A and B and the input circuits A and B are configured to correspond to the transmission paths A and H.

In addition to the above-described embodiments of the present invention, various methods can be considered for multiplexing the color difference signal and the audio signal. For example, it is also possible to independently modulate the color difference signals Pb and Pr.

Furthermore, it is also possible to perform FM modulation on the audio control signal, and it is also possible to perform AM modulation on the audio signals of multiple channels. Also, assuming that the audio control signal represents n types of audio signals, m unmodulated waves with different frequencies (m≦n) are set, and the audio control signal is expressed depending on the presence or absence of the unmodulated waves. , it is also possible to transmit and receive the unmodulated wave as the modulated voice control signal of this embodiment. Also,
The number of multiple channel audio signals may be less than or greater than four, and the number of carrier waves for modulating the multiple channel audio signals may be less than four or greater than four.

It is also conceivable to time-axis multiplex the color difference signal and the audio signal.

Effects of the Invention As described above, according to the present invention, the bandwidth of the transmission path is narrower than in the past, there is less signal deterioration when restoring multiplexed signals, and signal processing for this purpose is relatively easy. in,
Since the number of video and audio signal transmission paths between television devices can be reduced, there is an effect that connection between television devices can be easily performed.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a television video and audio signal transmitting device and a receiving device according to an embodiment of the present invention, FIG. 2 is a spectrum diagram of transmitted and received signals in the same device, and FIG. 3 is a conventional example of a television video signal transmitting device and a receiving device. FIG. 4 is a block diagram showing an audio signal transmitting device and a receiving device, and a spectrum diagram of a conventional example of transmitted and received signals. 1.31...Signal processing section of the video and audio signal transmitting device of the transmitting side television device 57 equipment, 2,32......Signal processing section of the video and audio signal receiving device of the receiving side television device, 21.41... Spectrum of luminance signal,
22...Spectrum of two-phase modulation color difference signal, 23
~26...FM audio signal spectrum, 27.
...Spectrum of voice control signal, 42...
- Spectrum of color difference signal Pb, 43... Spectrum of color difference signal Pr, 44.45... Spectrum of audio signal.

Claims (6)

[Claims] (1) It has a first transmitting means for transmitting a luminance signal of a video signal, a multiplexing means for multiplexing a color difference signal of a video signal and an audio signal, and a second transmitting means for transmitting an output signal of this multiplexing means. A television video and audio signal transmitting device characterized by: (2) a first receiving means for receiving a luminance signal of a video signal; a second receiving means for receiving a multiplexed signal in which a color difference signal of a video signal and an audio signal are multiplexed; 1. A television video and audio signal receiving device comprising a signal and a restoring means for restoring to an audio signal. (3) a first transmitting means for receiving the luminance signal of the video signal; a multiplexing means for multiplexing the color difference signal of the video signal and the audio signal; a second transmitting means for transmitting the output signal of the multiplexing means; a first receiving means for receiving a luminance signal of the signal; a second receiving means for receiving a multiplexed signal in which a color difference signal of a video signal and an audio signal are multiplexed; 1. A television video/audio signal transmitting/receiving device comprising a restoring means for restoring. (4) The multiplexing means includes a color difference signal modulator that modulates the color difference signal, a plurality of audio signal modulators that modulate the audio signals of multiple channels, an audio control signal modulator that modulates the audio control signal, and the color difference signal. Claim (1) characterized in that it is comprised of a mixer that frequency multiplexes the output of the modulator, the output of the audio signal modulator, and the output of the audio control signal modulator.
The television video and audio signal transmitting device described above. (5) The restoring means is composed of a color difference signal demodulator that demodulates the color difference signal, a plurality of audio signal demodulators that demodulates audio signals of multiple channels, and an audio control signal demodulator that demodulates the audio control signal. 3. The television video and audio signal receiving apparatus according to claim 2. (6) The multiplexing means includes a color difference signal modulator that modulates the color difference signal, a plurality of audio signal modulators that modulate the audio signals of multiple channels, an audio control signal modulator that modulates the audio control signal, and the color difference signal. The restoring means includes a mixer for frequency multiplexing the output of the modulator, the output of the audio signal modulator, and the output of the audio control signal modulator, and the restoring means includes a color difference signal demodulator for demodulating the color difference signal, and a mixer for frequency multiplexing the output of the audio signal modulator and the output of the audio control signal modulator. 4. The television video/audio signal transmitting/receiving apparatus according to claim 3, comprising a plurality of audio signal demodulators that demodulate audio signals and an audio control signal demodulator that demodulates audio control signals.