JPS6221431B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a playback method in which a video signal and an audio signal are recorded on a stereo audio tape, and the video signal is read out and the video is played back while the audio signal is read out and the audio is played back. Regarding the method.

In the conventional device of this kind, as shown in FIG. 1, the left track 2L of the stereo audio tape 1 is used as a video-only track and a video signal 3 is recorded on this track, and the right track 2R is used as an audio-only track and the video signal 3 is recorded on this track. The audio signal 4 is recorded on the track, the video signal is read out from the left playback head 5L, the video signal is once recorded in the memory and read out to play back on the cathode ray tube, and the audio signal is read out from the right playback head 5R. The audio was amplified before being played back through speakers, etc. However,
These conventional methods have the drawback that the length of the tape for recording video signals with a large amount of information is long, and it takes time to play back the tape, and furthermore, the audio can only be played back in monaural. In addition, since the video signal is always recorded on the left track of such audio tapes, it is said that using an ordinary audio tape player will not be able to reproduce only the audio, resulting in a lack of compatibility. There were also drawbacks.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a video and audio reproduction system using an audio tape that eliminates the above-mentioned drawbacks of the prior art.

An embodiment of the present invention will be described below with reference to FIGS. 2 and 3. FIG. 2 shows the recording format of signals on the stereo audio tape 6 in this system. First, video signals 8L and 8R are recorded on both the left track 7L and right track 7R. These video signals 8L and 8R are for displaying the lyrics of a popular song as a video, for example, and are divided into two by an appropriate method and recorded in half on a left track 7L and a right track 7R. do. For example, if the video screen is divided into dots and the video signal is expressed as a binary signal of "1" or "0", the signal is recorded bit by bit alternately on the left track 7L and the right track 7R. Just do it. If the video signals 8L and 8R are recorded using both tracks 7L and 7R in this way,
It is possible to record to one-half the length compared to the conventional method, and the time required to read out the video signal can also be reduced to one-half.

Note that control signals 9L, 9R, 10L, and 10R indicating the start and end of the video signals are preferably recorded before and after the video signals 8L and 8R, respectively. Further, video control signals such as a signal indicating the type of video (program) and a signal for synchronization may also be recorded.

Following these video signals 8L and 8R,
A left audio signal 11L and a right audio signal 11R are recorded on the left track 7L and right track 7R, respectively, as normal stereo signals. Therefore, by using the portions of both audio signals 11L and 11R, stereo audio can be reproduced on a normal stereo tape player, and compatibility can be established.

These recorded signals are reproduced by the left reproduction head 12L and the right reproduction head 12R.

Next, the configuration of an apparatus for reproducing video and audio using the stereo audio tape 6 will be described with reference to FIG. First, the left and right playback heads 12L,
12R reads out recording signals from left and right tracks 7L and 7R of the audio tape 6, and amplifies them by left and right preamplifiers 13L and 13R, respectively. The read signal is applied to the changeover switches 14L and 14R as well as to the changeover circuit 15. In the switching circuit 15, the control signals 9L, 9R, 10 in the recording signal
Detect when L and 10R are read,
During the reading period of the video signals 8L and 8R, the changeover switches 14L and 14R are switched to the terminal V side, and during the reading period of the audio signals 11L and 11R, the switching switches 14L and 14R are switched to the terminal A side.
Switch to the side.

Therefore, when the video signals 8L and 8R are being read, they are added to the interface 16 via the changeover switches 14L and 14R, and after performing necessary signal processing there, are written into the memory 17 in a predetermined order. This memory 17 is, for example, a high-speed RAM
etc., has a storage capacity for one screen of video, and stores video signals 8 in an order suitable for display.
The video signal in L and 8R or the video signal generated by the interface 16 based on it is stored. Thereafter, the video signal is read out repeatedly from the memory 17, subjected to necessary signal processing such as amplification at the interface 18, and then supplied to the cathode ray tube 19, thereby displaying video such as lyrics on the screen. . Therefore, this video can be displayed continuously by using the memory 17 even during the reading period of the audio signals 11L and 11R after the video signals 8L and 8R have been read out from the audio tape 6. I can do it. of course,
The interfaces 16 and 18 include all the video control signal identification circuits, control circuits, synchronization circuits, clock circuits, signal conversion circuits, etc. necessary for recording and reproducing signals in the memory 17.

In this way, the video is displayed, and when the reading of the video signals 8L and 8R from the audio tape 6 is finished, the control signals 10L and 10 are
R is detected by the switching circuit 15 and the switching switch 14
Switch L and 14R to the terminal A side, and then the left
The left and right audio signals 11L and 11R read from the right tracks 7L and 7R are sent to the left and right audio amplifiers 20L,
In addition to the signal 20R, stereo sound is reproduced by adding the signal from the amplification 12 to the left and right speakers 21L and 21R.

In this way, in this device, while images such as lyrics are projected on the cathode ray tube 19, the speakers 2
Stereo audio can be played from 1L and 21R. Therefore, if the stereo audio is made into a so-called karaoke version, it is possible to sing the song with the karaoke in the background while watching the displayed lyrics video, which can be used very effectively.

Furthermore, if this audio tape is used in an ordinary stereo tape player, the stereo audio can be reproduced as is by simply muting only the recorded portion of the video signal or reducing the volume.

As described above, according to the present invention, when playing back both video and audio using a stereo audio tape, it is possible to shorten the time required to play back the video signal, and to display the video while displaying the video. Sound can be played back in stereo, and the audio tape can also be played back on a normal stereo tape player, thus establishing compatibility.
This makes it possible to obtain a useful video/audio reproduction method.

[Brief explanation of the drawing]

FIG. 1 is a front view of a tape showing the recording state of the tape used in the conventional video/audio playback system, and FIG. 2 is a front view of the tape showing an example of the recording state of the tape used in the video/audio playback system of the present invention. The front view and FIG. 3 are block diagrams of an embodiment of a reproducing apparatus implementing the same method. 6...Stereo audio tape, 7L, 7
R...Left/right track, 8L, 8R...Video signal, 9L, 9R, 10L, 10R...Control signal,
11L, 11R...Left/right audio signal, 12L, 1
2R...Left/right playback head, 13L, 13R...
Preamplifier, 14L, 14R...switch switch,
15...Switching circuit, 16...Interface,
17...Memory, 18...Interface,
19...Cathode ray tube, 20L, 20R...Left/right audio amplifier, 21L, 21R...Left/right speaker.

Claims (1)

[Claims] 1 Record video signals in advance on both the left and right tracks of a stereo audio tape, then record the left and right audio signals on the left and right tracks, and then record the left and right audio signals on the left and right tracks. The video signal is read out by the playback head and written into the memory in a predetermined order, and the video signal is read out from the memory and displayed during the playback period of the audio signal, and the video signal is read out from the memory and displayed on the stereo. A video/audio playback system characterized in that, after reading out a stereo audio tape, the left audio signal and the right audio signal are read out by the left playback head and the right playback head to reproduce stereo sound.