JPS58101580A - Video disc reproducer - Google Patents

Abstract

PURPOSE:To improve the effect of slow motion or the like, by providing a sound information recorder and reproducer for a video disc reproducer, and outputting sound in synchronizing with video via a sound changeover switch at the special reproduction such as still and slow motion. CONSTITUTION:A disc recording signal is detected at a pickup device 1, given to a video processing circuit 2 and a tracking servo circuit 3, converted into the standard TV signal at the circuit 2 and outputted to a video output terminal 11. The sound signal from the circuit 2 is outputted from a sound output terminal 12 via a sound processing circuit 4. A sound changeover switch 6 is porvided between the circuit 4 and the terminal 12, and the switch 6 is changed over with a switching signal from a control device 5. The device 5 is controlled with the output of a data read circuit 7 when the output of the terminal 12 is a special reproduction, and outputted to the terminal 12 through the changeover with the sound from a tape recorder 9 operated as a sound information recorder and reproducer. The sound is outputted in synchronizing with the video to improve the effect of special reproduction.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to audio playback in a video disc playback device, particularly during still mode playback or slow motion mode playback.

Some video disc playback devices allow still mode playback or slow motion mode playback. In other words, still mode playback is a period during which video information and audio information are simultaneously recorded along the spiral recording groove of the video disc, during each rotation, without affecting the reproduced video.
For example, by returning the signal detection stylus or light beam to the original groove one rotation before during the vertical retrace period of a television signal, the same groove can be played back seemingly continuously, and the same video signal can be reproduced. This is a method of continuously and repeatedly playing back.

You can also play in slow motion mode, which in principle is the same as the still mode playback described above. For example, by playing the same groove twice, it becomes slow motion playback at 1/2 speed, 3 times, 4 times, etc.・By playing back 1 at a time, slow motion playback at speeds of /3, /4, etc. is possible.

The still mode playback or slow motion playback described above is effective when it comes to video information by playing back a certain screen as a still image or in slow motion, but when it comes to audio information, it is effective to play back a screen as a still image or in slow motion. This results in almost meaningless information. Therefore, in general, the audio during still or slow motion mode playback is muted so that it is not played back.

However, when audio information is required even during still or slow motion mode playback, for example, it may be desirable to have explanatory text for a still playback screen or audio information that matches slow motion video.

Therefore, in the present invention, by using an audio recording/playback device such as an audio tape recorder, the audio information during playback in still or slow motion mode is removed from the video disk by a control signal from the control device of the video disk playback device. This allows playback from an attached audio recording/playback device.

Hereinafter, as one specific embodiment, a case where an audio tape recorder is used as the audio recording/reproducing device will be described in detail.

The problem with this device is how to synchronize the playback positions of the disk and tape, that is, how to synchronize the reproduced video and audio. Generally, the tape feeding speed of an audio tape recorder is constant during normal playback, but during fast forwarding and fast reversing, the speed changes depending on the tape position and the tape winding state.

Therefore, in this embodiment, during tape fast forwarding, the rotation speed of the tape feed motor is controlled by a vertical synchronization signal separated from the reproduced video signal to keep the tape feed speed constant, and one channel of the tape is used to detect the tape position. The tape position detection code, which is similar to the track number recorded in the six grooves of the disc, is converted to a recordable frequency on the tape and recorded, making it possible to synchronize the playback positions of the disc and tape. ing.

The following will explain based on the block diagram shown in the drawings.A disc recording signal is detected by a pickup device II and supplied to a video processing circuit 2 and a tracking servo circuit 3.

The video processing circuit 2 is composed of an FM demodulation circuit, a luminance/color signal separation circuit, a color signal frequency conversion circuit, a dropout correction circuit, a time pace servo circuit, etc.
Conversion to V signal is performed.

The tracking servo circuit 3 is used to control the stylus or light beam so that it moves along a track, and to kick and control the stylus or light beam in a desired direction and number of times in response to an operation during special playback.

Next, the audio signal passes through the audio processing circuit 4, which normally includes a demodulation circuit, a noise suppression circuit, etc., and is output from the terminal 21. In particular, the audio signal reproduced from the tape during special playback according to the present invention is In step 6, this is done by a switching signal from the control device 5.

On the other hand, the track number recorded at a predetermined position during the vertical blanking period is separated by a data read circuit 7, inputted to the control device 5, and compared with a code reproduced from the tape, which will be described later, to track the reproduced track of the disc. Compare the position with the tape playback position.

Further, the vertical synchronizing signal separated in the data read circuit 7 is supplied to the tape recorder 9 to control the tape feeding speed at a constant level during fast forwarding. Furthermore, the track number is generally a code consisting of several dozen pits and is recorded within a specific horizontal scanning period. Therefore, it is difficult to record the frequency directly on the tape, so the modulation circuit 8 converts it to a recordable frequency and records it on the tape, and conversely, the demodulation circuit 1o converts the frequency and controls the reproduction code from the tape. Processed by device 5.

According to the video display and playback device of the present invention, as described above, since it is equipped with an audio information recording and playback device such as a tape recorder, it is possible to record audio synchronized with video during special playback of stills, slow motion, etc. Playback becomes possible.

[Brief explanation of drawings]

The drawing is a block diagram of one embodiment of the invention. L pickup device 2. Video processing circuit a Tracking servo circuit Raw audio processing circuit 5, control device a Audio selection switch 7 Data read circuit
a Modulation circuit p, tape recorder 1α demodulation circuit 1L video output terminal 12. Audio output terminal agent Patent attorney Aihiko Fukushi

Claims (1)

[Scope of Claims] L: An audio information recording and reproducing device is attached, so that during special playback of stills, slow motion, etc., audio synchronized with the video can be obtained from the reproducing device via an audio changeover switch to an audio output terminal. video disc playback device. 2. The video disc playback device according to Patent No. 1, characterized in that a tape recorder is used as the audio information recording and playback device.