JPH01109989A - Monaural video reproducing system - Google Patents

Abstract

PURPOSE:To select a different stereo audio signal multiplexed on a right/left eye FM video signal by providing an audio information designation means to a 1-beam video disk player so as to change over the means. CONSTITUTION:A PCM audio data through an LPF 20 is decoded by a PCM decoder and stereo audio information is outputted. Part of the FM demodulation output through an HPF 19 is given to an identification data detection circuit 16. Then the right eye or left eye track of the stereoscopic video disk is selected via a comparator circuit 17 according to an output of the audio information designation means 15. Thus, when the stereo audio information to be reproduced differs from the designated information, track jump is applied to reproduce the opposite recording track and the desired PCM data is given to a PCM decoder 22 and converted into a stereo signal. Thus, the audio signal can be selected optionally.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a monaural video playback system for playing back stereoscopic video disc records on a 1-beam video disc player.

(b) Conventional technology Regarding video discs that record 3D image information on spiral tracks, for example, there is a magazine published by Denshi Gijutsu Publishing.
It is introduced in "TV Technology" January 1986 issue, pages 20-23.

This conventional technology records video information for the right eye and left eye in combination on a field-by-field basis alternately on a single spiral recording track, and records left and right video information at the same timing on adjacent tracks. This paper proposes a VHD format video disc record.

The applicant previously proposed in Japanese Patent Application No. 61-262294 a video disc record in which video signals for the right eye and for the left eye are recorded separately on double spiral recording tracks.

In all of the above-mentioned conventional techniques, video 4 of the same timing is used.
The same FM stereo audio information is frequency-multiplexed into No. 6. Therefore, stereo reproduction of audio is possible even if either the right eye or left eye video information is reproduced.

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

Therefore, the present invention multiplex-records different stereo audio signals on the FM video signals for the right eye and the left eye, thereby making it possible to select the stereo audio signal.

(d) Means for Solving the Problems The present invention provides a one-beam video disc player for playing back a stereoscopic video disc record in which different stereo audio signals are multiplexed onto a right-eye video signal and a left-eye video signal. The present invention is characterized by providing means for specifying audio information and means for reproducing a recording track corresponding to the specified audio information.

(e) According to the present invention, when a stereoscopic video disc is played back by a one-beam video disc player, a recording track corresponding to designated stereo audio is played back.

(f) Examples The present invention will be described below according to an illustrative embodiment.

In the embodiment shown in FIG. 1, the right eye video (signal) information and the first stereo audio (signal) information of the original language are
A videotape that is modulated and frequency-multiplexed recorded using a video head is played back by a first high-speed VTR (Vl), and left-eye video (signal) information and translated second stereophonic voice (signal) information are respectively reproduced. Two types of stereo audio information are recorded on different recording tracks by playing back a videotape obtained by FM modulation and frequency multiplex recording using a videotape on a second high-fidelity VTR (V2). In FIG. 1, the synchronous oscillation circuit (1) is synchronously driven by the first and second high-speed VTRs (Vl) (V2), and video information and stereo audio information at the same timing are simultaneously derived. The right eye video information that can be derived from the If Eye VTR (Vl) is the identification data multiplexing circuit (2
) is entered. This identification data multiplexing circuit (2) multiplexes identification data during the vertical blanking period of video information.

The output of the identification data multiplexing circuit (2) is frequency modulated by the first FM modulation circuit (3) at the next stage. - The younger brother's 1st stereo conference information can be input to the 1st PCM encoder (4). This first PCM enfuder (4) is a well-known PCM enfueder necessary for recording on a funbact disc.
It is converted to D format PCM audio data. The PCM audio data of B has a frequency of 2 MHz or less, is frequency multiplexed together with the first FM modulation output in the first mixer (5), and is input to the first optical modulation means (6). - 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). ) (8) is frequency multiplexed in a second mixer (9) and is used as a modulation input of a second optical modulation means (10). The laser beams emitted from the first argon laser (11) and the second argon laser (12) are
The light is optically modulated by the second light modulation means (6) and (10). The first modulated beam is reflected by a reflecting mirror (13) and directed onto a stereoscopic video disk (D) via a beam splitter (14). As a result, an outer first F rack is formed. Further, the second modulated beam is irradiated onto the video disk (D) via the beam splitter to form a second inner track.

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

FIG. 2 is a circuit block diagram of a one-beam video disc player which is particularly meaningful for playing back a stereoscopic video disc (D) recorded as described above. 15). This audio information specifying means (15) allows reproduction of arbitrary stereo audio. This audio information specifying means (1
5) 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) that scans one recording track is filtered by a bypass filter (19) and a low-pass filter (
20) can be entered. FM video information obtained from the bypass filter (19) is input to an FM demodulation circuit (21) and demodulated. Further, the PCM audio data obtained from the low-pass filter (20) is input to the PCM decoder (22) and de-hooded to derive stereo audio information. A part of the FM demodulation output is sent to the identification data detection circuit (16)
is input. The identification data detection circuit (16) outputs a high level output when there is identification data, and outputs a low level output when there is no identification data. The comparison circuit (17) is
When the output of the audio information specifying means (15) and the output of the identification data detection circuit (16) do not match, a track jump pulse is input to the reproducing pickup (18), and the reproducing pickup (18) performs a track jump. to play the opposite track. Therefore, when the stereo audio information to be reproduced is different from the designated stereo audio information, a track jump is performed to reproduce the recording track on the opposite side, thereby making it possible to reproduce the desired stereo audio information. The above-mentioned stereoscopic video disc (D) is characterized in that it can be played back in monaural using a general-purpose video disc player and a television receiver, as mentioned above, but it should originally be played back on a 2-beam stereoscopic video disc player. It is something. FIG. 3 shows a block diagram of this two-beam video disc player.

In FIG. 3, adjacent recording tracks are reproduced and scanned by a two-beam pickup (23) that emits two laser beams. One of the two outputs obtained from this two-beam pickup (23), that is, the reproduction output of the first recording track, is input to the first bypass filter (24) and the tenth-pass filter (25), and the other, that is, the reproduction output of the second recording track. The reproduction output of the 2nd bypass filter (26) and the 20th
- input to the pass filter (27); Therefore, the output of each bypass filter (24) (26) is an output consisting of right eye video information and left eye video information F Mill L, respectively, and the first and second FM demodulation circuits (29) (30
) is FM demodulated. The first FM demodulation circuit (29
), identification data should be multiplexed in the right-eye video information obtained. An identification data detection circuit (31) inputting the output of the first FM demodulation circuit (29) detects identification data and generates a detection output. If this detection output is not generated, the track jump circuit (32) issues a track jump pulse. When this track jump pulse is input to the 2-beam pickup (23), the two playback beams perform a track jump of one track, and the playback information of the first recording track enters the first bypass filter (24). control.

On the other hand, PCM audio data obtained from the first and 20th pass filters (25) and (27) is input to the switching circuit (28). This switching circuit (2B) is connected to the audio information specifying means (1
The desired PCM audio data is input to the PCM decoder (22) and converted into a stereo signal. As mentioned above, both of the two recording tracks of the stereoscopic video disc (D) are PCM.
Although audio data is supposed to be multiplexed, it is expected that in some cases, PCM audio data may be multiplexed onto only one track. Therefore, the outputs of the first and 20th pass filters (25) and (27) can also be input to the first and second output detection circuits (33) and (34). Each output detection circuit (33) (34) emits an output when the input level is above a predetermined level. Each detection circuit (33) (34)
The priority switching circuit control circuit (35), which inputs the output of 28).

The image information for the right eye and left eye derived in this way is
The light is input to two projection television receivers whose planes of polarization are perpendicular to each other, and projected onto a common screen. If this screen is monitored using well-known polarizing glasses equipped with filters that make the plane of polarization orthogonal, it becomes possible to monitor stereoscopic images.

In the embodiment described above, 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.
It goes without saying that the M modulation carrier may be slightly changed depending on the track, or a constant frequency pilot signal may be multiplexed and recorded only on one track.

(g) According to the present invention, a double-spiral stereoscopic video disc can be produced by simply adding an audio information specifying means and a recording track selecting means to a stereo video disc player in which each recording track is different. When playing a disc, two types of stereo audio can be selected and played, which is very effective.

[Brief explanation of the drawing]

Each of the figures shows an embodiment of the present invention; FIG. 1 is a circuit block diagram of a stereoscopic video disc recorder;
Circuit block diagram of beam video disc player, 3rd
The figure shows a circuit block diagram of a two-beam video disk player, and FIG. 4 shows a schematic diagram of a stereoscopic video disk. (D)...Stereoscopic video disc, (15)...Audio information specifying means, (17)...Comparing means.

Claims (1)

[Claims] (1) A stereoscopic video formed by forming a double spiral recording track by simultaneously recording right-eye video information and first stereo audio information, and left-eye video information and second stereo audio information using two beams. In a one-beam video disc player for playing a disc, audio information specifying means for specifying stereo audio information on one side, and means for selectively reproducing a recording track corresponding to the designated output of the audio information specifying means, respectively. A monaural video playback system consisting of