JPH01164181A - Information recording disk and its reproducing device - Google Patents

Abstract

PURPOSE:To reduce the running cost of a disk by intermittently extracting video signals, in which the movies of two kinds of movie films are 2-3 pulled down, in the range of a field period of 2 fields or below, arranging the video signals alternately, and recording them. CONSTITUTION:A one-kind field video signals to compose one frame of each of the movie films of video signal program which are obtained by video- converting the images of the two kinds of the image films by a 2-3 pulling down, are extracted intermittently in the range of the field period of 2 fields or below so that the signals can be reproduced in the same time as the reproducing time of the video films, and the two kinds of the video signal programs are alternately arranged and recorded. Thus, information twice as much as that of a conventional one can be recorded, and consequently, the running cost of the disk can be reduced.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an information recording disc and a reproducing device thereof, and in particular to an information recording disc on which two types of video signals from a movie film are time-division multiplexed, and the information recording disc. The present invention relates to an information recording disc reproducing device c (hereinafter also referred to as a "player J") that reproduces video and audio signals recorded on an information recording disc (hereinafter also referred to as a "disc").

[Conventional technology]

Video discs have been known as information signal recording discs on which video and audio signals are recorded, but the present applicant first published Japanese Patent Publication No. 59-46066,
VHD (
(registered trademark) system (capacitance change detection type), video signals and audio signals are recorded at a rate of, for example, 4 fields per revolution. Furthermore, on an optical video disk that is read and reproduced using a laser beam, video signals and audio signals are recorded at a rate of, for example, two fields per rotation. Such a constant angular velocity (CAV
) format video discs, due to recording density limitations,
The recording and playback time per side is 1 for the former disc.
I only had time, and the latter was even shorter at 30 minutes.

On the other hand, in the case of movie film, 24 frames/second is converted into a 60 field/second video signal at the same time.
A technique is well known in which one frame of a movie film is enlarged and recorded into two or three fields of video signals in order to provide temporal correspondence using a so-called 2-3 pull-down method. In such a conversion method, almost the same video signal information is recorded on every two or three tracks of the video disc (although the odd and even fields are slightly different), and the degree of redundancy increases accordingly. The playback time is shortened. Therefore, if one frame of a movie film is recorded on a disk in correspondence with one field, the recording density can be increased, and the playback device is equipped with a field memory device to record one track (playback track in one rotation). If one frame of a series of movie films is expanded into two or three fields by repeated playback, the recording and playback time on the disk will be increased by 2.5 times. Based on this idea, the present applicant previously filed patent application No. 61-282588.
In the issue, we proposed a new information recording disk and its reproducing device.

A specific recording and reproducing method in such an information recording disc and its reproducing apparatus will be explained with reference to FIG. Figure 3 (8) The frame ■ of the movie film 30 shown in the figure (B) is converted into an odd field ■ and an even field [present] in the video signal (video image f 40), and the frame ■ is converted into the video signal. Convert frame ■ to odd field ■, ■ and even field ■, convert frame ■ to even field ■ of the video signal
and an odd field ■, and the frame ■ is converted into an even field [with], ■, and an odd field in the video signal (hereinafter the same M return).The solid line in each screen of the video image 40 is Odd fields and dashed lines indicate even fields. Figure 4 shows these images (video signals for each field) arranged in chronological order (
A). As is clear from both figures, odd-numbered frames are converted into two fields, and even-numbered frames are converted into three fields. When recording to the disk, there is one odd (or even) field for each frame.
Select each one and record them in the arrangement shown in FIG. 4(B). When playing a disc recorded in this way on a dedicated player, the same track on the disc can be played twice (see figure (C)), and it can also be written to a field memory device, as shown in figure (D). Each image is returned to its original order, and the video signal from the field memory device is read out and interpolated for reproduction.

It is displayed.

On the other hand, for audio signals, as shown in Figures (E) to (G), both the left and right channels are recorded separately, and during playback, the left or right channel is switched each time the disc rotates. By outputting in a time-division manner, the timing with the video signal is maintained.

[Problems to be solved by the present invention]

However, the above-mentioned conventional information recording disks and their playback devices use a special and complicated playback technology that plays back the same track twice, which makes the arrangement when recording on the disk complicated, making it difficult to record in real time. The disadvantage was that it was not possible to edit or record. Also, due to recording signal band restrictions, recording of one channel and one video program,
It also had the disadvantage that it could only be played. Note that the technology using the time division multiplex transmission method is
There is a technology, as typified by No. 4375 and Special Publication No. 8635 of 1983, which transmits and receives multiple images by time division multiplexing the video signal at specific intervals, but this is a 24-frame/second movie. It is not based on the technical content of converting film to NTSC video signals.

[Means for solving problems]

On the information recording disc of the present invention, one type of field video signal constituting one frame of each movie film of a video signal program obtained by converting the images of two types of movie films into video by 2-3 pulldown is used to reproduce the movie film. so that it is played at the same time as the time.

Two types of video signal programs are intermittently sampled within a field period of two fields or less and are alternately arranged and recorded, and the playback device is capable of recording the audio signal in the signal played back by the signal pickup circuit. an audio signal demodulation circuit that demodulates the video signal, a video signal demodulation circuit that also demodulates the video signal, a code decoding circuit that also demodulates the control signal, and an A/D that converts the above two types of video signals into digital signals.
a converter, and a first one that temporarily stores two types of video signals converted into digital signals. A by a control signal from the second field memory device and the code decoding circuit.
/D converter directly reproduced video signal or the first .
The first one selects and outputs one of the video signals temporarily stored in the second field memory device. a second switching circuit; The first switching circuit converts the digital video signal from the second switching circuit into an analog video signal. A second D/A converter and a control signal from the code decoding circuit control the multiplexed audio signal from the audio signal demodulation circuit to generate two types of audio signals corresponding to the first and second video signals, respectively. By configuring the device to include an audio signal control circuit that outputs an audio signal, the above-mentioned drawbacks can be solved.

〔Example〕

Regarding the information recording disc and its reproducing device of the present invention, the first
This will be explained with reference to the figures and FIG.

FIG. 1 is an explanatory diagram of the mode of recording and reproducing signals on an information recording disk (player), and FIG.
(2 frames per rotation in case of VIID method), same figure (B
) is the field period, “1” is an odd field, “2
'' and underlines in (C) to (G) represent even fields. In the same figure, (C) and (0) are the first and second video signals (programs) that are time-division multiplexed and synchronized with each other, respectively.
Each number indicates the frame number of the movie film, and fields consisting of the same frame have the same number.Both signals are images that have already been converted from 24 frames/second movie film to 60 frames/second. It's a signal.

Note that in consideration of audio lip sync during playback, the pulldown period of the second video signal is delayed by one field with respect to the first video signal. If the pulldown cycles are the same, the first video signal program will pick up the first field of the same frame number, and the second video signal program will pick up the second field of the same frame number. Although the same time-division multiplexed signal is obtained, during playback, which will be described later, the first field of the frame number of the second video signal program and the real-time audio are shifted by one field (sound comes first), and the lip synchronization does not match. In this case, this problem can be solved by recording the audio signal with a delay of one field.

In addition, the multiple marks drawn in (C) and (D) in the same figure indicate the fields to be picked up. In this way, the first field of the same frame number is picked up, and the intermittent field for time division multiplexing is This is a signal.

As a result, the first. Both second video signals can be sufficiently recorded on the same disc. The figure ([) is a video signal obtained by time-division multiplexing the first program and the second program, and a master disc is created in this signal form.

That is, two different programs are alternately recorded on the disc of the present invention. When reproducing signals recorded in this way, (F) and (G) in the same figure
As shown in FIG. 2, the first and second video signals are separated, and the signals of the same field are interpolated one or two at a time to restore and reproduce the original video signal. In addition, the same figure (F).

Fields marked with 0 in (G) are video signals read from a field memory device to be described later.

Next, the specific configuration and operation of the player that performs such reproduction will be explained with reference to FIG. In Figure 1, 2
3 is the pickup reproducing element, and 3 is the signal pickup circuit (
4 is an audio signal demodulation circuit (＾dio Denodulator), 5 is a video signal demodulation circuit (Video DeIlodulator)
), 6 is a code decoding circuit (Code Signal D
7 is a control signal generator (Contro
l Signal Generator), 8 is A/D
The converters 9 and 10 are the first . 2nd field memory device, 11.12 is a switching circuit, 13, 14 is a D/A
Converter, 15.16 is a video signal output terminal, 17 is an audio signal control circuit, and 18.19 is an audio signal output terminal. Note that the A/D converter 8 is inserted and connected between the connection points P1 and P2, and the D/A converters 13 and 14 are inserted between the field memory device 9 and the switching circuit 11, and between the field memory device 10 and the switching circuit, respectively. It may be configured by inserting it between 12 and 12.

Disc 1 not detected by pickup reproducing element 2
The recorded signal is taken out as a reproduction signal by the signal pickup circuit 3, and is sent to the audio signal control circuit 4, the video signal demodulation circuit 5. and is supplied to the code decoding circuit 6. The video signal demodulated by the video signal demodulation circuit 5 is converted into a digital signal by an A/D converter, and then sent to a field memory device 9,
10 and switching circuits 11.12. The disk 1 includes control signals for selecting a reproduced video signal and a video signal to be read out from the field memory devices 9 and 10, as well as for writing, reading, and operation timing in the field memory devices 9 and 10, for example. The command signal and code are recorded at a specific position within the vertical blanking period, and the code decoding circuit 6 demodulates the command signal and code. Each of these command signals is transmitted to the field memory devices 9, 10.
are supplied to the switching circuits 11 and 12 to control (instruct) writing and reading of each video signal, and are supplied to the switching circuits 11 and 12 to output the direct playback video signal or the field memory devices 9 and 10.
This is controlled to select one of the video signals written to. Due to this operation, Fig. 2 (F) and (G)
The two types of video signals shown respectively in the switching circuit 11
．． 12 and converted back to analog signals by D/A converters 13 and 14, respectively, and then sent to video signal output terminals 1, 5 .
16.

The command signal from the code decoding circuit 6 is sent to the audio signal control circuit 1.
7, where it controls the multiplexed (two-channel) audio signal from the audio signal demodulation circuit 4, and controls the multiplexed (two-channel) audio signal from the audio signal demodulation circuit 4.
Two types of audio signals respectively corresponding to the second video signal are outputted from output terminals 18 and 19. The audio and video signals from the output terminals 18 and 19 and the video signal output terminals 15 and 16 are desirably configured to be output to separate display devices by providing two display devices. If there is only one device, the control signal generator 7 can be used to input the signal and output the signal to the display device. In this case, the field memory device, switching circuit, D/A converter, and video signal output terminal are
In this case, for example, the first half of a movie is recorded as the first video signal program, and the second half of the same movie is recorded as the second video signal program. A video disc can record 4 hours of feature-length movies on both sides, and with LV (laser vision), CAM (constant angular velocity) can record up to 1 hour on each side, and CLV (constant angular velocity) can record up to 2 hours on each side. Of course, the present invention can also be applied to recording media such as CD-V (registered trademark; compact disc containing video signals). Alternatively, by recording a movie with subtitles, such as a foreign movie, as the first video signal program and recording the same movie without subtitles as the second video signal program, by operating the control signal generator 7, The configuration may be such that one program is selectively displayed.

In addition, the usage format when two display devices are provided is as follows.
For example, a karaoke image with lyrics is recorded as the first video signal program, a karaoke image without lyrics is recorded as the second video signal program, the former display screen is shown to the singer, and the listener is shown the karaoke image. By setting the latter display screen to be shown, the listener has the advantage of being able to enjoy viewing the image without being bothered by the text of the lyrics.

The control signal generator 7 is composed of an operation switch, a remote control device, or the like, and when the user operates the control signal generator 7, a signal is supplied to the code decoding circuit 6 to change the reproduction state. The operation includes, for example, switching of video signals (and audio signals) to be displayed on a display screen (not shown) such as a CRT. Further, the control signal generator 7 may be configured to instruct operations similar to operations based on various instruction code signals recorded on the disk.

In the above explanation, it is assumed that a 24 frame/second movie film is converted into a 60 field/second video signal, but multiple video signals that are time-division multiplexed as shown in Figure 2 (E) are , it is not limited to movie film, and may be one (odd or even) field signal of a 60 field/second video signal. Naturally, the signal is an alternating array of direct reproduced video signals and video signals written in the field memory devices 9 and 10.Movie film and 60 fields/second video signals are 1. The second video signal may be recorded on one disc, and not only two video signals but also many more video signals may be time-division multiplexed and recorded on the disc and played back on a player. In addition, even if there are two video signal systems, the audio signals of each system can be multiplexed into three or more channels and recorded on a disc, making it possible to record digital audio contained in the same channel as analog audio. It can also be used.Furthermore,
In addition to the two types of time-division multiplexed video and audio signals, a normal signal area may be provided on one side of the disc to record conventional video signals.

Note that as the information recording medium of the present invention, a disk (disk) is used.
Although the description has been made assuming that a magnetic tape is used, the present invention is not limited to this, and a belt-shaped recording medium such as a magnetic tape and a reproducing device thereof may also be used.

〔effect〕

Since the information recording disk and its reproducing device of the present invention are configured as described above, the information recording disk can record twice as much information as the conventional one in recording and reproducing time, and therefore the running cost of the disk is reduced, and the reproducing device It has the feature that multiple different video signals can be played back and displayed simultaneously or at different times without using complicated I/O systems for special playback, and furthermore, various usage forms can be realized by combining the two. .

[Brief explanation of the drawing]

FIG. 1 is a block system diagram of the information recording disc reproducing apparatus of the present invention, and FIGS. FIG. 3 is a principle diagram for explaining the method of signal reproduction by the apparatus of the present invention, FIG. (
E) to (G) are principle diagrams for explaining how to record and reproduce a video signal and an audio signal on a disk, respectively. DESCRIPTION OF SYMBOLS 1... Information recording disk (disc), 2... Big-ass reproducing element, 3... Signal pickup circuit, 4...
・Audio signal demodulation circuit, 5...Video signal demodulation circuit, 6.
...Code decoding circuit, 7...Control signal generator, 8...
- A/D converter, 9, 10... 1st. Second field memory device, 11.12... switching circuit, 1
3゜14...D/A converter, 15.16...Video signal output terminal, 17...Audio signal control circuit, 18.19
...Audio signal output terminal. Patent applicant: Victor Company of Japan (A) (Sayama 7 Nrem) (β) (
B;U-Saihi (Irregular diagram 3 Procedural amendment (method) 1. Indication of the case 1988 Patent Application No. 219095 2. Name of the invention Information recording disc and its reproducing device 3. Person making the amendment Relationship to the incident Patent applicant address 3-12-4 Moriyamachi, Kanayō-ku, Yokohama-shi, Kanagawa Prefecture
, Date of amendment order: January 31, 1989 (dispatch) 5. Brief description of drawings in the specification subject to amendment, and drawing 6. Contents of amendment (1) Page 18 of the specification, No. 12 Line “(E) and (F)
〜(G)'' is corrected as ``(D), (E), (F) J.

Claims (2)

[Claims] (1) An information recording disk in which two types of video signals are time-division multiplexed field by field in an arbitrary arrangement on the same video channel, and the images of two types of movie films are converted into video by 2-3 pulldown. One type of field video signal constituting one frame of each movie film of the video signal program is intermittently sampled within a field period of 2 fields or less so that it is played back in the same time as the playback time of the movie film, An information recording disc characterized in that the two types of video signal programs described above are alternately arranged and recorded. (2) Each movie of a video signal program in which two types of video signals are time-division multiplexed recorded in an arbitrary arrangement field by field on the same video channel, and images of two types of movie films are converted to video by 2-3 pulldown. One type of field video signal constituting one frame of film is intermittently sampled within a field period of 2 fields or less so that it is played back in the same time as the playback time of the movie film, and the above two types of video signals are An information recording disc playback device that plays back recorded signals on an information recording disc on which signal programs are alternately arranged and recorded, and an audio signal demodulation circuit that demodulates an audio signal in the signal reproduced by a signal pickup circuit. , a video signal demodulation circuit that also demodulates the video signal, a code decoding circuit that also demodulates the control signal, and an A/D converter that converts the above two types of video signals into digital signals.
The first and second field memory devices each temporarily store the two types of video signals converted into the digital signals, and the control signal from the code decoding circuit allows the A/
Directly reproduced video signal from the D converter or the first
, first and second switching circuits that select and output one of the video signals temporarily stored in the second field memory device, respectively; and digital video signals from the first and second switching circuits. The multiplexed audio signal from the audio signal demodulation circuit is controlled by the first and second D/A converters that return the analog video signal, respectively, and the control signal from the code decoding circuit. It is equipped with an audio signal control circuit that outputs two types of audio signals corresponding to the video signals, and outputs a series of video signals based on a pull-down method in outputting both of the video signals, and outputs a selected one type of video signal program. What is claimed is: 1. An information recording disc playback device characterized in that it is capable of playing back two types of video signal programs or simultaneously playing back two types of video signal programs.