JPS59177709A - Voice recording system of video disc - Google Patents

Abstract

PURPOSE:To reproduce voice such as the explanation of a specific picture at the time of still reproduction by recording codes indicating the starting end and final end of digitized voice information in a vertical blanking period of specific video information. CONSTITUTION:The video information of the specific screen is provided with the vertical blanking section in its prescribed position and code signals indicating the starting position AS and end position S of the digital voice information D in the 1st voice channel 2 are recorded in the vertical blanking period of the video information V similarly to a code signal. To reproduce a video disc in which digitized voice information (PCM signal) is recorded, a still reproducing mode is set up at first. when a static picture of the specific picture is displayed, a digitized voice recording starting code is simultaneously detected by a code processing circuit. The read-out digital signal is converted into an analog signal by a D/A converter 23 and outputted from the 1st voice channel terminal 31 through a voice switching circuit 24.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to an audio recording system for videodinuk.

(Technical background) Certain types of video discs and their player systems allow playback of still images (hereinafter referred to as "null playback").
J: 1 along the track of the recorded video Dinuk
Once per rotation, the needle tip (light beam in the optical system)'il
) By moving the rack back, the same track can be played continuously, and the same video information can be played repeatedly. Conventionally, when playing back this still image, i-1 regarding video information
: 6 specific screens can be played back as still images, but the audio information is discontinuous and has almost no meaning. Therefore, in general, audio during still playback is muted so that it is not output.

However, even during this still playback, it may be desirable to record audio information such as an explanation or description of the particular screen.

(Object of the Invention) Therefore, it is an object of the present invention to provide an audio recording method for a video recording system that enables reproduction of audio such as explanation of a specific screen at the time of natural reproduction.

(Summary of the Invention) Audio information necessary for still playback of a specific screen is digitally encoded and recorded in a part of one of the two audio channels of a video dinuke.

Then, a code indicating the start and end of the digitally encoded audio information is recorded in the blanking period of the first page of the video information of the specific screen. This makes it possible to extract the digitally encoded audio information during still playback of the specific screen, and by adding audio information to the visual information even during still playback, the functionality of the video disc system can be further improved. becomes.

(×Example) Hereinafter, the present invention will be specifically explained based on the entire V I-I D method using examples.

FIG. 1 is a conceptual diagram showing the recording positional relationship of video and audio information in a portion where a specific screen on which audio information can be output during still playback is recorded. 1 is the recording channel of the video information of the specific IQ plane, 2 is the first audio channel, 3 is the second
In the audio channel, the video disc rotates in the direction of arrow R. The position AS is the playback start position of the audio information when playing the video information vl still of the specific screen of channel 1, and when the time required to play this audio information is - iT seconds, the position is 91 seconds before the position AS. S is the playback end position of the audio information. In this example, audio information necessary for explaining a still image is recorded in the form of a PCM signal from position AS to position S of the first audio channel 2. In addition, the entire area of the second audio channel 3 and the area other than the digital audio information of the first audio channel 2 are provided with the same video information V/V as before.
Analog audio information regarding A2. A□ is recorded.

The video information V[ of a specific screen has a vertical blanking section at a predetermined position, and a specific H position of this section contains a time code, track number code, chapter number code, and whether the two audio channels are bilingual, stereo, or monaural. Contains the audio code f. Similar to these code signals, during the vertical blanking period of the video information V, the start position AS of the digital audio information of the first audio channel 2 is
Code signals DS and DE indicating the end position sl are recorded. Digital audio information @1Df in this format
f: When all stills of a recorded video disc are played back, it is possible to hear an audio explanation regarding a specific screen (still image) of the video/picture report V.

Next, the player system for reproducing the video disc will be explained based on the block diagram of FIG. 2. 10 is a pickup device, 11 is an FM demodulation circuit, 12 is a video signal processing circuit, 13 is a tracking servo circuit, 14 is a bandpass filter for the first audio channel, 15 is a demodulation circuit for the first audio signal, and 16 is a demodulation circuit for the first audio signal. 2 audio channel bandpass filters, 17 a demodulation circuit for the second audio signal, 20 a code processing circuit for reading and processing the code signal during the vertical blanking period, 21 a decoder for the PCM digital signal, 22 a digital memory, 23 is a digital/analog switching circuit, 24 is an audio switching circuit for switching between the first and second rear door channels, 31 is an output terminal for the first audio channel, 32 is an output terminal for the second audio channel, etc. 230
is a video signal output terminal.

For parts where video and audio information are recorded on the video disc in the same way as before (for example, parts other than positions As to S in FIG. 1), signal processing is the same as before, and the disc recording signal detected by the pickup device 10 is The video signal (FM demodulation circuit 11 and dropout correction 2)
The signal is reproduced into a standard color television signal by a video processing circuit 12 including a color frequency conversion circuit and the like, and outputted from a terminal 30. On the other hand, the back door signal is filtered through different bandpass filters 14, 16 (3, 43Ml-1) depending on the channel.
z, 3.73 MHz) and reproduced by the FM demodulation circuits 15 and 17, respectively, and then passed through the audio switching circuit 24 and output from the terminals 31 and 32.

Next, in order to reproduce the video recording in which digitally encoded audio information (PCM signal) is recorded, the still reproduction mode is first set. At the same time that a still image of a specific screen is displayed, a digitally encoded audio recording start code DS is detected by the code processing circuit. The PCM (7J) 7' digital signal is read from the start position As specified by the code signal, rearranged in the digital iodine 21, or after any errors are removed, it begins to be stored in the digital memory 22. Then, at the same time as the end code signal D1'' is detected, the writing boundary is ended and the PGM signal written in the digital memo 'J22Vc' is read out.

The read digital signal is converted into an analog signal by the digital/analog conversion circuit 23 and outputted from the first audio channel terminal 31 via the audio switching circuit 24.

2. If this particular screen is played in normal mode instead of full still playback =U, as shown in Figure 1, at position AS-i, the audio information A□ of the first audio channel and the audio information A□ of the second audio channel are
While playing the audio information A2 of the audio channel, the position A
From S to Sl, the muting applied to the first audio channel is suppressed, and after this period, the first and second audio channels are played back (as in normal playback).
Make bilingual or Nuteleono wart.

This control can also be easily performed using the digitally encoded audio information start position code DS and end position knee FDE recorded during the vertical blanking period.

In addition, although the above embodiment t4 V is related to the HD system, the technical idea disclosed herein is applicable to other systems such as CED.
It can also be used individually for IVI CA optical system video disc systems.

(Effects) As described above, according to the audio recording method of the present invention, it is possible to output audio information regarding a specific screen during still reproduction during still reproduction.

[Brief explanation of drawings]

FIG. 1 is a conceptual diagram of an embodiment of the present invention, and FIG. 2 is a schematic block diagram of a video disc player implementing the method of the present invention. l...Video information channel, 2...1st audio channel, 3...M2 audio channel, D...
- Digitally encoded audio information, As... recording start position of digitally encoded audio information, S... recording end position of the same. Patent applicant: Sharp Corporation Representative: Patent attorney: Hajime Aoyama and 2 others 43

Claims (1)

[Claims] (1) Audio information related to specific video information is digitally encoded and recorded in a part of one audio channel of a two-channel audio video disc, and a code indicating the start and end of the digitally encoded audio information. All of the above specific video information is recorded during the vertical blanking period,
An audio recording system for a video disc, characterized in that the digitally encoded audio information can be extracted when the specific primary image information is still reproduced. (2) The video disk audio recording system according to claim (1), wherein the digitally encoded audio information is a PCM signal.