JPS63212283A - Recording disk information reproducing device - Google Patents

Abstract

PURPOSE:To easily reproduce the video signal of two screens from a recording disk on which the video signals different for every field by adding a field memory and a switch circuit. CONSTITUTION:A CPU 20 controls the writing and the reading of the field memories 21, 22, the field memories 21, 22 store the one field of the video signal. The FM modulation signal of the disk recorded for every one field is picked up by a photodetector 1 and outputted to an MIX circuit 7 as the video signal and the switch circuit 23 is switched for every field by the CPU 20. Thereby, when the A, B video signals are displayed on the same television and viewed by the use of glasses different in a phase difference, for instance if the phase difference of the pictures of the A, B is made different and recorded on the disk, a stereoscopic picture can be observed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a recording disc information reproducing device, and particularly to a reproducing device that can double the reproduced information by reproducing from a disc on which two different screens are recorded. . BACKGROUND ART Recently, disks with a diameter of about 12 inches on which FM modulated signals of video signals and audio signals are recorded have been commercially available. In each of these FM modulation signals, the audio signal is converted into two channels, 2, 3M11z and 2.8
Each of the M 11 z audio carriers is FM modulated by two audio channel signals. Also, the video signal has a sync chip of 7.6M II Z
, the frequency is converted so that the pedestal level is 8.1 MHz and the white peak is 9.3 MHz. Each of these FM modulated signals is recorded on the disk.

This disc contains a 30 minute CAV disc (Co
nstant Angular Velocity; standard disc) and CLV disc (Con5
There are two types: tant Linear Velocity (Long Time Disc). FIG. 3 shows an outline of this recorded disc.

The disc shown in Figure 3 has a lead intra track on the inner circumference that indicates the start of the disc rotation, a play track that is an FM modulation signal of a video signal or audio signal, and a lead out track on the outer circumference that indicates the end of the disc rotation. It is recorded. I showed the third prisoner how the CAV disk was recorded, and! 1 frame per revolution, 1 frame per half revolution
The frame number code and chapter number code of the sync and digital code are recorded during the vertical (V) blanking period. Figure 3B
shows the state of recording on a CLV disc. Since it is read out at a constant linear velocity, the recording length of the I frame and I field are the same, and the V sync and frame number code are recorded during the vertical blanking period. , V sync, chapter number code, etc. are recorded in the next vertical blanking period. In addition, writing to this disc,
The reading speed is 1800 rpm for CAV discs.
The rotation is constant, but with a CLV disk, the rotation is 180 at the innermost circumference.
From 0 rotation/rotation, the rotation speed is slowed down toward the outer circumference, and the rotation speed becomes about 600 rotations/minute, about 1/3 of the rotation speed, at the outermost circumference. Therefore, on a CLV disc, 1 frame per revolution is recorded on the innermost circumference, and 3 frames per revolution are recorded on the outermost circumference, allowing playback of 60 minutes on one side of the disc, making it suitable for software such as movies.

Next, the above-mentioned recording disk reproducing apparatus will be explained. The configuration up to the video signal output, which is the output of the MIX circuit 7 in FIG. 1, is a conventional playback device.

When the modulated FM modulation signal that is optically diffracted by the pits recorded on the recording disk and returned by light reflection is photoelectrically converted using the photodetector I, an FM modulation signal is obtained as a reproduced RF electric signal. This RF electric signal is passed through a preamplifier 2, corrected by an FM collector 3 using fluctuations in spatial frequency characteristics depending on the disc playback position as pickup position information, and then processed by a band pass filter (BPF) 4 with a band of 3.5 to 15 MHz to output the video F. Only 'M carrier waves are separated and demodulated into a video signal by the FM detector 5. In this case RF1! If a dropout occurs due to scratches, dirt, etc. on the air signal raw signal, switch! 8 is activated, and only during the dropout period, the video signal from 1 Iit earlier is replaced and the appearance of noise on the TV screen is prevented. The pre-IH signal is obtained by passing the demodulated video signal through a delay circuit 6 using COD or the like. From the dropout-corrected video signal, various types of information (frame number, chapter number, control signal, etc.) contained in a predetermined scanning line in the vertical blanking section are detected by the code extraction circuit 9 and subjected to logical processing. The signal is converted into a display signal such as a frame number or chapter number in the circuit (CPU) 20, and is also introduced into other control signals and used for the operation and timing of the servo system of this playback device. Furthermore, a signal is added to this video signal by the MIX circuit 7 according to a control signal from the CPU 20 in order to display a frame number, chapter number, etc. on the screen, and the signal is output as a video signal.

On the other hand, the r''M modulated signal has a BPF' of 2.3Ml-1z.
11 and 2.8M [Iz BPF l 2 separates the audio FM modulation signal, and respectively FM detector 1
3°14, and dropout (DO) detection W15.16 and switch 17 are used to detect if there is a scratch on the disc and a dropout occurs in the playback signal. It prevents this and outputs it as an L, * audio signal.

In addition, the mechanical control system of the disk includes focus servo, tracking servo, slider servo, tangential servo, etc., but the former three are logically processed by the CPU 20 based on the output of the photodetector l, and the servo is effectively controlled along with various controls. It takes.

[Problems to be Solved by the Invention] The playback device described above does not take into consideration discs on which different information such as stereoscopic images is recorded.

Therefore, while singing the same song in a karaoke system, etc., there is a recording disk that is recorded so that it can be projected to the left and right eyes in one field FI so that it can be projected as a three-dimensional image by effectively utilizing the phase difference of the human eye. There is a need for a playback device that can create a recording disk on which different video signals are recorded for each field so as to display different images depending on the mood, etc., and that can effectively play back the disk.

[Means for Solving the Problems] The present invention was made in view of the need for an apparatus that can effectively reproduce the above-mentioned recording disk. The object of the present invention is to provide a recording disc information reproducing apparatus that outputs two-screen video signals by obtaining a control signal for switching to a video signal.

[Example 1] Hereinafter, an example of the present invention will be described in detail based on the drawings.

In FIG. 1, 20 converts the code signal from the code extraction circuit 9 into an image signal and generates a control signal to be mixed in the MIX circuit 7, controls the readout of the field memories 21 and 22, and adjusts the timing. Further, a CPU generates various control signals, 21.22 is a field memory that stores one field of a video signal, 23 is Δ,
This is a switch circuit that switches and outputs the B video signal. Note that the same parts as in the conventional example are indicated by the same reference numerals, and the explanation of these parts will be omitted.

As described above, the FM modulated signal of the disc recorded every l field is picked up by the photodetector 1 and outputted to the MIX circuit 7 as a video signal. This video signal is supplied to the terminals a and d of the switch circuit 23, to the terminals A and C via the field memory 21, and to the terminal C via the field memory 22, and is output as an A video signal and a B video signal. That is, the field memory and the switch are connected in parallel. A switching control signal for the switch circuit 23 is generated by the CPU 20 using a synchronization signal from a video signal synchronization separation circuit, and the switch circuit 23 is switched field by field.

Furthermore, the writing and reading timing and address designation of the field memories 21 and 22 are controlled by the CPU 20. Therefore, for example, if there are output signals of A, Bt, At, Bt, ... from the MIX circuit 7 for each field of a video signal, the field memory 21 has A +, A *.
, ~ are stored, and A1. is stored in the A video signal output. A
In At, At, ~ are output in sequence. Similarly, Bt is stored in the field memory 22.

Bt, ~ are stored, and B is output as the B video signal.

B,, nt, By, . . . are sequentially output.

-M A Q +/ 5-J-795Me day-/7"l Knee 1- L'out-'i
If you use I-display and watch using glasses with different phase differences,
For example, if images A and I3 are recorded on a disk with different phase differences, a three-dimensional image can be observed. Similarly, Δ, which has common audio but is unrelated to images,
If the B video signals are displayed separately or only on one of the televisions, the A or B video signals can be viewed on two screens or depending on the usage environment.

In the above embodiment, an example is shown in which two field memories are provided, but as shown in FIG. The signal provides a signal equivalent to that described above.

Further, in the above embodiment, an example of an optical recording disk and its reproducing device was explained, but if it is a video disk, other types of recording disk and its reproducing means can also be used.
It goes without saying that similar effects can be achieved by applying this invention.

E. Effects of the Invention As described above, according to the present invention, field memories 21, 22 or frame memory 24 and a switch circuit are added to the conventional playback device, and by controlling with the control signal of the CPU, the playback can be performed every field. It is possible to easily reproduce video signals from a recording disc on which different video signals have been recorded.

In addition, the generation of control signals for the CPU is not significantly different from the control signals generated from conventional synchronization signals, and requires only pulses for each field and control pulses for writing and reading. The invention can be easily applied.

Furthermore, since it is possible to play back a recording disk on which different video signals are recorded for each field, it is possible to obtain an image with twice the playback time compared to a conventional recording disk. This can be easily obtained by reproducing the B video signal.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a recording disk information reproducing apparatus according to one embodiment of the present invention, FIG. 2 is a block diagram showing a part of another embodiment of the present invention, and FIG. 3 shows the recording state of the recording disk. FIG. 1--Photodetector 4, Il, 12--nPF 5.13.14--FM detector 9--Code extraction circuit

Claims (2)

[Claims] (1) A recording disc information reproducing device capable of reproducing a recording disc on which an FM modulated signal frequency-modulated with an audio signal and a video signal different for each field is recorded, which outputs the video signal of the field and the video signal of the field. 1. A recording disk information reproducing device characterized in that it is equipped with a switching means for switching between a signal and a video signal via a one-field memory or a frame memory, and has two outputs. (2) A patent claim characterized in that there are at least two one-field memories, the switching means are connected in two stages in parallel, and the video signal output and the video signal of the field memory are connected in parallel across the middle. A recording disc information reproducing apparatus according to item 1.