JPH0720272B2 - Monaural video playback system - Google Patents

Description

The present invention relates to a monaural image reproducing system for reproducing a stereoscopic video disc record by a one-beam video disc player.

(B) Conventional technology A video disk for recording three-dimensional image information on a spiral track is introduced, for example, in the magazine "TV Technology", January 1986, pages 20 to 23, published by Electronic Technology Publishing.

In this conventional technique, right-eye video information and left-eye video information are alternately combined and recorded on one spiral recording track in field units, and left and right video information at the same timing are recorded on adjacent tracks. It proposes a VHD format video disc record.

In addition, the applicant previously proposed in Japanese Patent Application No. 61-262294 a video disk record in which video signals for the right eye and the left eye are separately recorded on a double spiral recording track.

In the above-mentioned conventional techniques, the same FM stereo audio information is frequency-multiplexed and recorded on the video signal at the same timing. Therefore, even if one of the right-eye and left-eye image information is reproduced, stereo reproduction of audio becomes possible.

(C) Problems to be Solved by the Invention However, in the above-mentioned conventional example, only the same stereo audio information is reproduced even if the right-eye video signal is reproduced or the left-eye video signal is reproduced, and the monaural video is reproduced. There was no merit when doing.

Therefore, the present invention multiplexes different stereo audio signals on the FM video signals for the right eye and the left eye, and enables selection of the stereo audio signals.

(D) Means for Solving the Problems The present invention provides a one-beam video disc player for reproducing a stereoscopic video disc record in which different stereo audio signals are separately recorded on the right-eye video signal and the left-eye video signal. It is characterized in that a means for designating audio information and a means for reproducing a recording track corresponding to the designated audio information are provided.

(E) Thus, according to the present invention, when the stereoscopic video disc is reproduced by the one-beam video disc player, the recording track corresponding to the designated stereo sound is reproduced.

(F) Example Hereinafter, the present invention will be described in accordance with an example.

In the embodiment shown in FIG. 1, a first video tape is formed by FM-modulating the right-eye video (signal) information and the first stereophonic audio (signal) information of the original language and frequency-multiplex-recording using a video head. A video tape that is played back on a high-fidelity VTR (V1), FM-modulates the left-eye video (signal) information and the second stereo audio (signal) information of the translated word, and frequency-multiplex-stores them using a video head. Hifi VT
By reproducing at R (V2), two types of stereo audio information are recorded on different recording tracks. In FIG. 1, the synchronous oscillation circuit (1) is a first and second high-fidelity VTR.
It is synchronously driven by (V1) and (V2), and video information and stereo audio information at the same timing are simultaneously derived.
The right-eye video information derived from the first hi-fi VTR (V1) is input to the identification data multiplexing circuit (2). This identification data multiplexing circuit (2) multiplexes identification data in the vertical blanking period of video information. The output of the identification data multiplex circuit (2) is frequency-modulated by the first FM modulation circuit (3) at the next stage. On the other hand, the first stereo audio information is the first P
It is input to the CM encoder (4). This 1st PCM encoder (4) is a well-known
It is a PCM encoder and is converted into PCM audio data in CD format. This PCM audio data has a frequency of 2 MHz or less, and is frequency-multiplexed with the first FM modulation output in the first mixer (5) and input to the first optical modulation means (6). On the other hand, the left-eye video information derived from the second high-fidelity VTR (V2) is directly input to the second FM modulation circuit (7), and the second stereo audio information is input to the second PCM encoder (8).
The outputs of both circuits (7) and (8) are frequency-multiplexed in the second mixer (9) and used as the modulation input of the second optical modulation means (10). Laser beams emitted from the first argon laser (11) and the second argon laser (12) are optically modulated by the first and second light modulating means (6) and (10). The first modulated beam is reflected by the reflection mirror (13) and is irradiated onto the stereoscopic video disc (D) via the beam splitter (14). As a result, the outer first track is formed.
Further, the second modulated beam is irradiated onto the video disk (D) via the beam splitter, and the second track inside is formed.

FIG. 4 shows a double spiral recording track formed on the stereoscopic video disc (D) recorded by the above-mentioned video disc recorder. As is clear from this figure, the first recording track (T1) for recording the right-eye image information is on the outside as shown by the broken line, and the second recording track (T2) for recording the left-eye image information is as shown by the solid line. Are formed inside. Each recording track complies with the standard of the current optical video disc and can be individually reproduced by a general-purpose optical video disc player.

FIG. 2 is a circuit block diagram of a one-beam video disc player having a particularly significant meaning by reproducing the stereoscopic video disc (D) recorded as described above. 15) is provided.
This audio information designating means (15) enables reproduction of any stereo audio. This voice information designation means (15)
Emits a high level output when selecting the first stereo audio information, and emits a low level output when selecting the second stereo audio signal. On the other hand, the reproduction information reproduced by the reproduction pickup (18) scanning one recording track is the high-pass filter (19) and the low-pass filter (20).
Entered in. FM obtained from high-pass filter (19)
The video information is input to the FM demodulation circuit (21) and demodulated and derived. The PCM audio data obtained from the low pass filter (20) is input to the PCM decoder (22) and decoded to derive stereo audio information. Part of the FM demodulation output is input to the identification data detection circuit (16). The identification data detection circuit (16) outputs a high level output when there is identification data and a low level output when there is no identification data. The comparison circuit (17) reproduces the track jump pulse when the output of the audio information designating means (15) and the output of the identification data detection circuit (16) do not match.
The playback pickup (18) plays back the opposite track by making a track jump. Therefore, when the stereo audio information to be reproduced is different from the designated stereo audio information, the track jump is performed to reproduce the recording track on the opposite side, and the desired stereo audio information can be reproduced. The stereoscopic video disc (D) described above is also characterized in that it can be reproduced in monaural by using a general-purpose video disc player and a television receiver as described above, but it should be reproduced by a two-beam stereoscopic video disc player. It is a thing. Figure 3 shows
The block diagram of this 2 beam video disc player is shown. In FIG. 3, adjacent recording tracks are reproduced and scanned by a two-beam pickup (23) which emits two laser beams. One of the two outputs obtained from the two-beam pickup (23), that is, the reproduction output of the first recording track, is input to the first high-pass filter (24) and the first low-pass filter (25), and the other one, that is, the second output.
The playback output of the recording track is the second high-pass filter (2
6) and the second low pass filter (27). Therefore, the output of each high-pass filter (24) (26) is an output obtained by FM-modulating the video information for the right eye and the video information for the left eye, respectively, and is output to the first and second FM demodulation circuits (29) (30). FM
Demodulated. Identification data should be multiplexed in the right-eye video information obtained from the first FM demodulation circuit (29). An identification data detection circuit (31) which receives the output of the first FM demodulation circuit (29) detects the identification data and generates a detection output. When this detection output does not occur, the track jump circuit (32) issues a track jump pulse. When this track jump pulse is input to the 2-beam big-up (23), the two reproduction beams perform track jump for one track, and the reproduction information of the first recording track is the first high-pass filter (24). Control to enter.

On the other hand, the PCM audio data obtained from the first and second low pass filters (25) and (27) is input to the switching circuit (28).
This switching circuit (28) can arbitrarily switch control according to the output of the audio information designating means (15), and inputs desired PCM audio data to a PCM decoder (22) to convert it into a stereo signal. 2 of 3D video disc (D) on the stick mentioned above
The PCM audio data should be multiplexed on all the recording tracks of the book, but in some cases, it is expected that the PCM audio data is multiplexed only on one track. Therefore, the first and second low-pass filters (25) (27)
Each output of is also input to the first and second output detection circuits (33) (34). Each output detection circuit (33) (34) outputs an output when the input level is equal to or higher than a predetermined level. The priority switching circuit control circuit (35) which inputs the output of each detection circuit (33) (34) issues an output when PCM audio data is multiplexed only on one side, and audio information designating means (15). It controls the selection state of the switching circuit (28) in preference to the output of.

The image information for the right eye and the image for the left eye thus derived is
It is input to two projection television receivers whose polarization planes are orthogonal to each other and projected on a common screen. If this screen is monitored by well-known deflecting glasses having filters for making the planes of polarization orthogonal to each other, it is possible to monitor a stereoscopic image.

In the above-described embodiment, the identification data is multiplexed in the vertical blanking period of the right-eye video information in order to identify the first recording track and the second recording track.
You can change the modulation carrier slightly depending on the track,
It goes without saying that the constant frequency pilot signal may be multiplex-recorded on only one track.

(G) According to the present invention, according to the present invention, a stereoscopic video disc having a double spiral stereoscopic video disc is different for each recording track. When playing a disc, two types of stereo sound can be selected and played, and the effect is great.

[Brief description of drawings]

1 shows an embodiment of the present invention, FIG. 1 is a circuit block diagram of a stereoscopic video disc recorder, FIG. 2 is a circuit block diagram of a 1-beam video disc player, and FIG. 3 is a 2-beam video disc player. The circuit block diagram and FIG. 4 respectively show schematic explanatory diagrams of a stereoscopic video disc. (D) ... stereoscopic video disk, (15) ... audio information designating means, (17) ... comparing means.

Claims (1)

[Claims] 1. A double spiral recording track is formed by simultaneously recording right-eye video information and first stereo audio information, and left-eye video information and second stereo audio information with two beams. In a one-beam video disc player for reproducing a stereoscopic video disc, an audio information designating unit for designating one stereo audio information and a unit for selectively reproducing a recording track corresponding to the designated output of the audio information designating unit. , A monaural video playback system that is arranged separately.