JPH04207489A - Moving picture recorder - Google Patents

Abstract

PURPOSE:To record and reproduce multiplexedly plural kinds of moving picture information consecutively on one and same storage medium simultaneously by providing a multiplex synthesis means and a demultiplex reproduction means to the recorder. CONSTITUTION:When plural kinds of moving picture information sets are simultaneously inputted at moving picture recording, a multiplex synthesis means (relating function to prisms 213, 214) outputs a multiplex recording signal multiplexed and synthesized based on each modulation signal subject to individual modulation processing resulting from plural kinds of moving picture information sets inputted simultaneously to a recording medium 1 via a head and the signal is consecutively recorded multiplexedly on a same recording area. On the other hand, at reproduction of a moving picture, a demultiplex means (relating function to prisms 213, 214) reproduces demultiplexedly each modulation signal from a multiplex recording signal read from a storage medium via a head, and demodulation means (optical modulation/demodulation devices) 207, 211 demodulate each modulation signal reproduced demultiplexedly simultaneously into each individual picture information to reproduce plural sets of moving picture information. Thus, plural moving pictures are simultaneously recorded and reproduced.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a moving image recording device that manages input moving image information in a rewritable manner on a storage medium, and in particular reads/writes moving image information multiplexed. The present invention relates to a video recording device.

[Prior Art] Conventionally, in order to continuously rewrite moving image information in this type of device, a method using a voice recorder or an endless tape has been adopted.

Furthermore, the apparatus is configured to continuously capture moving image information by connecting a plurality of recording apparatuses having the same function and processing the input moving image information.

[Problem to be solved by the invention 1 However, in the above conventional example, the following (1) to (
There was the problem shown in 3).

(1) A recording device that employs the endless method has a problem in that the amount of information to be written is extremely small.

(2) When recording by scanning in one direction using magnetic tape (excluding endless format) as a recording medium, rewinding is required to rewrite the information from the recording start point after recording has finished. Na .

Therefore, there was a problem that continuous recording was not possible with a single magnetic tape.

(3) One type of moving image information is recorded on a single recording medium, and when multiple types of moving images are recorded, recording is performed in time division, which reduces the amount of information that can be allocated. was there.

The present invention was made to solve the above problems, and involves multiplexing and combining signals that are individually modulated based on multiple types of video information from different input systems and recording them in parallel on the same recording medium. Alternatively, it is an object of the present invention to obtain a moving image recording device capable of simultaneously recording and reproducing a plurality of moving images by individually extracting modulated signals from multiplexed and synthesized multiple recording signals and individually demodulating them.

[Means for Solving the Problems] A moving image recording device according to the present invention uses a head to multiplex recording signals that are multiplexed and synthesized based on each modulation signal obtained by individually modulating a plurality of types of moving image information input simultaneously. a multiplexing/synthesizing means for outputting the modulated signals to the recording medium via the head; a separating/reproducing means for separating and reproducing each modulated signal from the multiplexed recording signal read from the storage medium via the head; A demodulating means for demodulating the modulated signal into individual moving image information is provided.

[Function] In the present invention, when multiple types of video information are simultaneously input during video recording, the multiplexing means modulates the multiple types of video information input simultaneously based on each modulation signal individually modulated. The multiple recording signals that are multiplexed and combined are applied to the recording medium via the head to continuously multiplex record in the same storage area.

On the other hand, during video playback, the separation and playback means separates and plays back each modulated signal from the multiplexed recording signal read out from the storage medium via the head, and the demodulation means simultaneously separates and plays back each modulated signal into individual video information. It is possible to demodulate and play multiple pieces of video information at the same time.

[Embodiment] FIG. 1 is a block diagram illustrating the configuration of a moving image recording device showing an embodiment of the present invention. Reference numeral 1 denotes an optical disk serving as a storage medium, and is configured to be able to rewrite a plurality of pieces of information at the same time. and is rotated at a predetermined speed by a drive motor of the optical disk driver 2, which will be described later. Reference numeral 3 indicates an optical head, which is scanned back and forth in a scanning direction 7 or a scanning direction 9 by a head motor (scanning means) not shown. Reference numeral 4 indicates the innermost circumference of the recordable area of the optical disc 1, and a light beam or a readout light beam is synthesized, multiplexed, and modulated based on a plurality of moving image information input between the innermost circumference 4 and the outermost circumference 5. A modulated beam is emitted from the optical head 3 to the optical disk 1, and a plurality of pieces of moving image information are recorded and reproduced.

8 is a controller, and a control program (including each procedure of the flowchart described later) stored in ROM 8a
The optical disk driver 2 is comprehensively controlled based on the following.

A RAM 8b functions as a work area and stores seek jump information instructed from an input means (not shown) as well as work information.

Note that when a plurality of pieces of moving image information are input to the controller 8, a converting means (for example, an optical modulator/demodulator 207 to be described later) converts the moving image information into, for example, an optical signal. This converted optical signal is written from the optical head 3 onto a recording medium (for example, an optical disk) rotating at a constant speed while being scanned by a scanning means.

In the video recording apparatus configured as described above, when multiple types of video information are simultaneously input during video recording, multiple combining means (in this embodiment, prisms 213 and 214, which will be described later as optical combining or separating means), are used. (Achieved by the association function of) multiplexed recording signals that are multiplexed and synthesized based on each modulation signal obtained by individually modulating multiple types of moving image information that are simultaneously input are output to the recording medium via the head and stored in the same storage area. Perform multiplex recording.

On the other hand, during video playback, the separation and playback means (in this embodiment, by a function linked to the prisms 213 and 214) separates and plays back each modulation signal from the multiplexed recording signal read out from the storage medium via the head, and demodulates the signal. The stage (in this embodiment, optical modulators/demodulators 207 and 210, which will be described later) demodulates the simultaneously separated and reproduced modulated signals into individual video information, making it possible to simultaneously reproduce a plurality of video information. do.

FIG. 2 is a block diagram showing an example of a drive circuit for recording the optical head 3 shown in FIG.
It is FM modulated by. 202 is an audio input port, into which an audio signal is input, and the FM modulator 204 at the subsequent stage outputs an FM signal.
Modulated.

205 is an adder that outputs the sum of the FM-modulated video signal and the audio signal to the limiter 206 at the subsequent stage. The limiter 206 shapes the addition output, converts it into a rectangular wave, and outputs the rectangular wave to the optical modulator/demodulator 207. The optical modulator/demodulator 207 receives the wavelength λ from the laser 208. The laser beam (light beam) is modulated based on the input rectangular wave, and a laser beam 209 is output. By similar means, a laser beam (light beam) with a wavelength λ (≠E) from a laser 210 is modulated by an optical modulator/demodulator 211, and other video signals and audio signals are output as a laser beam 212. . Laser light 2
09 and the laser beam 2124i are combined and multiplexed by the nosms 213 and 214, and a recording beam is emitted onto the optical disk 1. A spindle motor 215 rotates the optical disc 1 at a predetermined speed.

FIG. 3 is a block diagram illustrating the configuration of an imaging device that generates a video signal to be input to the video human-powered boat 201 shown in FIG.
A moving image 302 captured by 01 is processed into three primary colors (for example, RED) by a three primary color separation unit 303 composed of a prism, a mirror, a filter, etc.

GREEN, BLUE) and photoelectrically converted into three primary color video signals by image pickup tubes 304 to 306 corresponding to each color component. 307 to 309 are amplifiers, which amplify the three primary color video signals while transmitting them to the color encoder 31 in the subsequent stage.
0, and a composite color video signal 311 is output to the video manual boat 201 shown in FIG.

FIG. 4 is a block diagram showing an example of a drive circuit for the optical head 3 shown in FIG. 1 during reproduction. A D/A converter 401 converts the demodulated signal demodulated by the optical modulator/demodulator 207 into an analog signal. A band pass filter 402 separates the demodulated analog signal into an audio signal and a video signal, and outputs the signals from a video output port 403 or an audio output port 4.4.

As can be seen from this figure, when reading multiple pieces of information registered on the optical disc 1 at the same time, the optical disc 1 is irradiated with a light beam 405 emitted from the laser 208 that has written the desired information, and the reflected light is optically modulated. /Demodulator 20
It is demodulated at 7. The demodulated signal is converted into a frequency modulated signal by a D/A converter 401, and is supplied to a bandpass filter 402 where it is separated into a video signal and an audio signal, which are output from an audio output port 404 to a video device (not shown) and played. be done.

Next, referring to FIG. 5, the moving image recording/reproducing parallel processing operation according to the present invention will be explained.

FIG. 5 is a flowchart illustrating an example of a moving image recording/reproduction parallel processing procedure according to the present invention.

Note that (1) to (22) indicate each step.

First, the controller 8 determines whether or not a moving image is being played back (1). If YES, the optical head 3 (for playback) scans in the outer circumferential direction (scanning direction 7) to continue playing back the moving image (
2). Next, determine whether or not a video is being recorded 3)
, if YES, the optical head 3 (for recording) is scanned in the outer circumferential direction to continue recording moving images (4).

Next, it is determined whether or not the playback by the optical head 3 has ended 5), and if YES, it is determined whether the recording has ended 6), and if YES, the process returns to step (1).
If so, determine whether recording has been completed up to the outermost circumference 5 (7); if No, return to step (1); if YES, stop recording and move the optical head 3 to the innermost circumference 4 (8). ), return to step (1).

On the other hand, if the judgment in step (5) is No, the outermost 5
Determine whether or not the playback has been completed until 9). If NO, return to step (6); if YES, interrupt playback and seek the optical head 3 to the innermost circumference 4 (10) and return to step (6). .

On the other hand, if the judgment in step (3) is No, it is decided whether or not to record moving images11).If it is YES, the number of moving images to be recorded is set and the laser beam used to record each moving image is set. Determine the wavelength (12), make the recording optical head 3 seek jump to the recording start point (13), and proceed to step (12).
Return to 4).

On the other hand, if the judgment in step (11) is No, stop the laser light output and stop recording 14), judge whether both recording and playback should be stopped 15), and if No, return to step (5). If YES, determine whether or not to replace the optical disk 116); if NO, terminate the process and Y.
If it is an ES, replace it with any optical disc 1 (17), and decide whether to record and play back on the replaced optical disc 1 (17).
8) If the answer is No, the process ends; if the answer is YES, the process returns to step (1).

On the other hand, if the judgment in step (1) is No, it is necessary to judge whether a request to play a moving image has been made19)
, if YES, select the moving image to be reproduced, determine the wavelength of the laser for reproducing the moving image (20), and make the optical head 3 for reproduction seek jump to the reproduction start point (21).
), the process returns to step (2), and if NO, the laser light output is stopped and the regeneration process is canceled (22), and the process returns to step (3).

In the above embodiment, the case where one moving image is to be reproduced has been described, but it goes without saying that a plurality of pieces of moving image information can be simultaneously read out using lasers of different wavelengths.

[Effects of the Invention] As explained above, the present invention is capable of transmitting a multiple recording signal that is multiplexed and synthesized based on each modulation signal obtained by individually modulating a plurality of types of moving image information input simultaneously to a recording medium through a head. a multiplexing/synthesizing means for outputting the multiplexed signals to the storage medium; a separating/reproducing means for separating and reproducing each modulated signal from the multiplexed recording signal read out from the storage medium via the head; Since the present invention is provided with a demodulating means for demodulating each video information, it is possible to continuously multiplex record or reproduce multiple types of video information on the same storage medium at the same time. Therefore, there is no need to record each piece of video information intermittently unlike the conventional method of recording video information on a time-sharing basis. This has the effect of dramatically increasing the amount of information stored in the memory.

[Brief explanation of the drawing]

FIG. 1 is a block diagram illustrating the configuration of a moving image recording apparatus showing an embodiment of the present invention, and FIG. 2 is a block diagram showing an example of a drive circuit for the optical head shown in FIG. 1 during recording. FIG. 3 is a block diagram illustrating the configuration of an imaging device that generates a video signal to be input to the video input port shown in FIG. 2, and FIG. 4 shows the optical head during playback shown in FIG. FIG. 5 is a block diagram showing an example of a drive circuit, and a flowchart illustrating an example of a moving image recording/reproducing parallel processing procedure according to the present invention. In the figure, 1 is an optical disk, 3 is an optical head, 2°8.210
is a laser, 207, 211 is an optical modulator/demodulator, 213,
214 is a prism. Figure 1 Figure 2

Claims (1)

[Claims] In a video recording device that writes or reads video information while scanning a read/write head on a storage medium, a video recording device that writes or reads video information while scanning a read/write head on a storage medium uses multiple types of video information input simultaneously based on each modulation signal that is individually modulated. multiplexing means for outputting a multiplexed recording signal to be multiplexed and combined to the recording medium via the head; and a separating and reproducing means for separating and reproducing each modulated signal from the multiplexed recording signal read from the storage medium via the head. and a demodulating means for demodulating each modulated signal simultaneously separated and reproduced by the separating and reproducing means into individual pieces of moving image information.