JPS6243394B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a video and audio recording and reproducing apparatus that is capable of reproducing both a disc on which video signals are recorded and a disc on which audio signals are recorded as PCM.

Recently, a video recording and reproducing method called a video disc was announced, making it possible to reproduce television video and audio signals from a single disc.
Further, by applying this technology, an audio recording and reproducing device using a PCM (pulse code modulation) disk has been developed.

Conventionally, in such playback devices, separate dedicated playback devices have been used for video discs and audio PCM discs, but there are many common parts, and one player can play both. It would be convenient if playback could be performed simply by installing a disk, and although the cost per device is high, it would be much cheaper than having two dedicated machines, so it would be convenient.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, it is an object of the present invention to provide a video/audio recording and reproducing apparatus which can reproduce a video disk and an audio PCM disk by simply attaching them to the single reproducing apparatus.

Hereinafter, the present invention will be described with reference to illustrated embodiments. First, the recording device section A that records an identification signal for identifying whether it is a video disc or an audio PCM disc will be described.

That is, as shown in FIG. 1, the clock generator 1 is used to quantize the audio signal P (the audio signal P is an audio signal for PCM recording, and the audio signal V is an audio signal to be recorded simultaneously with the video signal). Clock pulses are supplied to the sampling pulse generator 4 and the synchronizing signal generator 2. The synchronization signal generated by the synchronization signal generator 2 is used to add a synchronization signal to a PCM signal as described later, or to synchronize a camera, VTR, etc. that supplies a video signal from the terminal 17. Ru. Further, the audio signal P enters from the terminal 14, is sampled inside the PCM encoder 9 using pulses generated by the sampling pulse generator 4, and converted into PCM by an A/D (analog/digital) converter or the like. At this time, since the sampling pulses are generated at regular intervals, they cannot be inserted into something that has a blanking period, such as a television signal. Therefore, the time axis conversion pulse generator 5 generates a pulse for time axis conversion using the clock from the clock generator 1 and the synchronization signal from the synchronization signal generator 2. ...Horizontal period) The time axis is compressed by the time axis converter 10 so that the PCM audio signal generated during the period falls within the scanning period of one horizontal period. and,
This compressed signal enters the switching circuit 11 and terminal 1
Record PCM according to the switching signal from 5 or
It switches whether or not to record the video signal supplied from the terminal 16 through the video amplifier 12. The audio PCM signal or video signal output from the switching circuit 11 enters the synthesizer 6, and the audio PCM signal or video signal output from the switching circuit 11 is input to the synthesizer 6, and the audio PCM signal or the video signal is input to the synthesizer 6, and the audio PCM signal or the video signal is input to the synthesizer 6, and the audio PCM signal or the video signal is input to the synthesizer 6, and the audio PCM signal or the video signal is input to the synthesizer 6, and the audio PCM signal or the video signal is input to the synthesizer 6. A code signal indicating whether the signal is a video signal or a video signal is added. The output signal of this synthesizer 6 is amplified by an output amplifier 7 and is normally input to an FM modulator 8 to output an audio signal V from a terminal 18.
The signal is combined with the FM modulated signal by the FM modulator 13, outputted to the terminal 19, and recorded on a disk (not shown). Although the recorder is not particularly shown here,
There are various methods, such as laser, electron beam, and mechanical cutting, which differ depending on the video disc method.

Next, the reproducing device section B for reproducing the disc recorded in this manner will be described.

That is, as shown in FIG. 2, the signal recorded on the disk 20 is detected by the signal detection device 21.
The signal is converted into an electrical signal, and there are optical, piezoelectric, capacitive, etc. methods depending on the disk type. The electric signal thus obtained is sent to the amplifier 22.
is amplified by and enters the filter circuit 23,
The audio signal V recorded by FM modulation is separated along with the video information. This audio signal V is transmitted to the FM demodulator 3
2, the signal is converted into a low frequency signal by the signal switch 33.
to go into. On the other hand, the video portion and the audio PCM portion are demodulated by the FM demodulator 24, and a video signal or audio PCM signal containing a synchronization signal is obtained, respectively. This signal is extracted by the synchronization separation circuit 25 and represents a specific horizontal period within the vertical retrace period containing the code signal (e.g.
19H) signal is produced by the 19H pulse generator 26. Furthermore, the timing pulse generator 2 generates various timing pulses using this signal and the synchronization pulse.
8, one of which enters the code detector 27 and detects a code signal representative of video or PCM inserted within the vertical retrace period;
An identification signal indicating either one is output. This identification signal is used to switch the audio signal between PCM and video.

On the other hand, a part of the signal demodulated by the FM demodulator 24 enters the video signal processing circuit 29, where it is converted back to its original state after band-converting color signals etc. when recording on the video disc, and is converted back to the original signal for normal television. It is converted into a video signal that can be received by the receiver and sent to the video output terminal 34.
is derived. Furthermore, a part of the FM demodulated signal simultaneously enters the time base converter 30, and the PCM code inserted in the signal is extracted by the signal generated by the timing pulse generation circuit 28, and the PCM code inserted into the signal is extracted by the signal generated by the timing pulse generation circuit 28, and is interrupted at the retrace time such as the synchronization signal period. The signal is converted to a continuous PCM signal. Then, from the time axis converter 30 to the PCM
The signal entering the decoder 31 is converted from a PCM code to an audio signal. The PCM audio signal P and the audio signal V are selected by the switching circuit 33 and output to the audio output terminal 35. Here, the audio output terminal 35 and the video output terminal 34 are connected to a television receiver (not shown) (an audio device in the case of audio only), and the video and audio are actually reproduced.

As described above, according to the present invention, the identification signal inserted in advance in the vertical retrace period is used to
By identifying whether it is a PCM disk or a video disk, a single playback device can automatically play and perform, but since the circuits and costs required for each device are common, many of the components are It is possible to provide an extremely good video/audio recording/playback device that can greatly reduce the amount of noise compared to the above and eliminate the troublesome manual switching.

[Brief explanation of the drawing]

FIGS. 1 and 2 are block diagrams showing a recording device section and a playback device section, respectively, in an embodiment of the video/audio recording and reproducing apparatus according to the present invention. A...Recording device section, B...Reproducing device section.

Claims (1)

[Scope of Claims] 1. A video/audio recording/playback device capable of playing back a PCM disk or a video disk, which converts the audio signal for the PCM disk into PCM and enters the scanning period of one horizontal period of a television signal. A first signal whose time axis is compressed and a video signal for a video disk are selectively derived, a synchronization signal is added to the derived signal, and a PCM signal is added to a specific horizontal period within the vertical retrace period. A recording device unit adds an identification signal to identify whether it is a disc or a video disc and records it on the disc, and the recording unit detects a signal from the disc on which the signal is recorded, and detects the identification signal included in the detection signal. A video/audio recording/playback device comprising a playback unit that extracts a signal and automatically switches and derives an audio playback system between a PCM disk and a video disk. 2. The recording device unit converts the audio signal for the PCM disk into PCM, and compresses the time axis of the PCM audio signal so that it falls within the scanning period of one horizontal period of the television signal; Therefore, the compressed PCM signal and the video signal for the video disc are selectively switched and derived, and audio is output in a portion corresponding to a specific horizontal period within the vertical retrace period for the derived PCM signal and video signal. A means for adding an identification signal and a synchronization signal to identify whether it is a PCM or a video signal, and selecting each FM modulation component of the signal to which the identification signal is added and the audio signal for the video disc by this means. a means for deriving the signal by synthesizing it, and a signal derived by this means.
2. The video and audio recording and reproducing apparatus according to claim 1, further comprising means for recording on a PCM disk or a video disk. 3. The reproducing device section includes means for reproducing the PCM disc or video disc to which the identification has been added to obtain an electrical signal, and a video signal and an audio PCM for the video disc from the electrical signal obtained by this means. a first FM demodulation means capable of demodulating the signal, a second demodulation means for demodulating the audio signal for the video disc, and a first FM demodulation means capable of demodulating the video signal and the audio PCM signal from the output of the first FM demodulation means. a means for generating a signal for extracting the identification signal by extracting a synchronization signal from the sample; a means for generating first, second, and third timing signals based on the sampled signal and the synchronization signal; means for extracting an identification signal added to each signal demodulated by the first demodulating means using a timing signal of 1, and a means for extracting an identification signal added to each signal demodulated by the first demodulating means; means for converting into a receivable video signal;
means for extracting the audio PCM signal component inserted into the signal demodulated by the demodulation means using the second timing signal and converting it into a continuous PCM signal; means for converting the signal into a normal audio signal, and a means for converting the signal into a normal audio signal;
Claim 1, further comprising means for identifying and deriving the PCM audio signal and the video disc audio signal demodulated by the second demodulating means using the identification signal. The video/audio recording/playback device described above.