JPH0244569A - Picture storage device - Google Patents

Abstract

PURPOSE:To successively read data from data to correspond to a desired time by providing a writing processing part which repeats writing and reading processing part to successively execute reading according to a writing order from a designated track in an optical disk. CONSTITUTION:Since a writing head driving part 3 executes the writing with being endless, the program of a station, which is turned by a television tuner 1 is continuously recorded to a magneto-optical disk 4. Next, by the operation of an operating part, a reading pick-up driving part 5 starts the reading of the disk 4 from the designated track. After the reading of the outer-most circumference track is finished, the driving part 5 searches the track in the inner-most circumference and starts the reading again. During the search, a reading control circuit 32 reads the data in a RAM 31. When the display of a televisions set 7 is executed by switching the output signal of a demodulating circuit 6, the picture data at a time, which goes back only by the time of correspond to the designated track, can be displayed on the television set 7.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to an image storage device suitable for use when recording/playing back images, etc., in, for example, television broadcasting.

"Prior Art" Video cheap recording is generally used to record/playback images of television programs, etc. When performing playback, after recording a desired program, etc., the videotape is rewound and played back from the recording start point.

"Problem to be Solved by the Invention" By the way, even while recording is in progress, there are times when it is desired to play back a portion that was recorded a while ago. However, in a video tape recorder, playback is not possible during recording, so if you want to watch a slightly earlier part, you have to stop recording. On the other hand, when recording a television program or the like, the user often does not want to interrupt the recording, and in such cases, the desired part could only be played back after the program ended.

In addition, video tape recorders have the disadvantage that it takes time to rewind, so it takes time to repeatedly play back a desired part. To provide an image storage device which is made by a computer, can play back a desired part during recording, and does not require time even when the desired part is repeatedly played back. It is an object.

"Means for Solving the Problem" In the invention according to the first claim, writing is performed on six tracks of an optical disc sequentially based on image data corresponding to a supplied image signal, and iI7 writing of all tracks is performed. The optical disc includes a write processing unit that returns to the first track once the IF write is completed and repeats the IF write, and a read processing unit that sequentially reads data from designated tracks of the optical disc in the writing order.

Further, in the invention according to the second claim, in addition to the above-mentioned configuration, the write processing unit may perform the above-mentioned operation during the period from the end of writing of the last track to the time when rewriting to the first track is started. A semiconductor memory stores image data corresponding to an image signal, and when the read processing unit outputs a read signal of the first track after outputting the read signal of the last track, the read signal of the semiconductor memory is stored during the period. The output switching device 1) is provided to change the output signal to the output signal of the readout processing section and avoid outputting it.

"Action" In the invention described in the first claim, the writing process 11<
Since the optical disc endlessly writes image signals, the optical disk always stores image signals for a predetermined period of time from the present time. Then, the stored image data is read out by the readout processing section in order from B to B corresponding to a desired time.

Furthermore, in the invention set forth in the second claim, since image data of a period that cannot be stored by the writing processing section is written into the semiconductor memory, temporal interruption occurs by using this image data. Image data can be read without any trouble.

"Embodiments" Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. In the figure, 1 is a television tuner, which outputs image/audio signals of a tuned station. This image/audio signal is supplied to the FM modulation circuit 2 and modulated into I''M i, and then supplied to the link head drive 3.
The terminal T I is a terminal to which a video signal etc. from an external device (Video Cheap Record, etc.) is supplied.
The signal supplied to FM is subjected to F'M conversion by the FM modulation circuit 2 and is supplied to the write head drive section 3.The write head drive section 3 is not shown in FIG. According to this figure, 10 is a drive interface, and when the FM modulated audio signal and image signal output from the 1"M modulation circuit 2 are synthesized, this synthesized signal is is made into a limiter waveform by a limiter circuit, ;(
The data is supplied to the optical head 11 as V-inclusive data. In addition, the drive interface IO is
It now supplies control commands to the controller I2.
The system controller 12 controls the disk drive system according to the supplied command 21 (fJl).

Light head! The method controls irradiation of laser light based on write data to form pits on a magneto-optical disk. This optical head 11 is a feed motor! 3 in the radial direction of the optical disk 4, thereby sequentially tracing the tracks on the magneto-optical disk 4 from the innermost circumference A.

The position data of the optical head is fed back to the system controller 12, and a servo control signal is created based on this feedback signal. The servo control signal is supplied to the feed servo circuit 14, and the feed servo circuit 14 controls the rotation of the feed motor 13 based on the servo control signal. Thereby, the optical head 11 accurately traces the track on the magneto-optical disk 4. Further, after the optical head II traces the outermost track, the system controller 12 supplies a control signal to the feed servo circuit I4 so that the optical head II traces the track sequentially from the innermost track again.

In this way, the optical head II is configured to perform endless recording.

Next, the focus/tracking servo circuit 15 is a circuit that performs focus and tracking servo control of the optical head 11 under the control of the system controller I2. Reference numeral 16 denotes a disk motor that rotationally drives the magneto-optical disk 4, and the number of rotations of this disk motor 6 is fed back to the system controller I2.

The system controller 12 creates a servo signal based on the fed-back rotation speed data and supplies it to the disk servo circuit 17. The disk servo circuit 17 controls the rotation speed of the disk motor 16 to a predetermined constant value based on the supplied servo signal. The reason why constant rotation control is performed in this way is that it is necessary to write image data and the like by the optical head 11 at a constant angular velocity.

The above is the configuration of the write head drive section 3.

Next, numeral 5 shown in FIG. 1 is a readout pickup drive section, the configuration of which is shown in FIG. 2. The read pickup drive unit 5 has the same configuration as the above-described 11F-included head drive unit 3 except that it does not have a disk motor and its drive system, and the parts 20 to 25 are the same as the parts 10 to 15, respectively. corresponds to the part. However, the read pickup drive unit 5 is designed to operate only when read command data is supplied. Further, track instruction data U (U) is supplied to the system controller 22, and the initial reading position of the optical head 21 is controlled according to this track instruction data.
1 is controlled so that after reaching the track indicated by the track instruction data, the track is sequentially directed to the outer tracks. Further, after reading data from the outermost track, control is performed to return to and read data from the innermost track.

The read command data and track command data supplied to the system controller 22 are both generated by operating a predetermined operating section (path shown). Furthermore, the signal read out by the optical head 21 is
It is supplied as an output signal of the read pickup drive section 5 to the demodulation circuit 9 shown in FIG. The demodulation circuit 9 demodulates the supplied signal and creates a 1iTii visual signal and an audio signal. These signals are supplied to an external television 7 via an output terminal To. 8 is a video tape recorder, which is used to store the output signal of the demodulation circuit 6.

Next, 30 shown in FIG. 1 is a binary data conversion circuit;
The output signal of the 2M modulation circuit is converted into binary data and rLA
This is a circuit that writes to M31. The binary data converting circuit operates while the optical head II of the write head driving section 3 moves from the outermost track to the innermost track. Moreover, RΔM31 is the capacity (T) that can store the output signal of the FM modulation circuit 2 during the relevant period.
The data stored in M31 is read by the read control circuit 32 and supplied to the demodulation circuit 9. Read control circuit 3
2 is driven while the optical head 21 of the read pickup drive unit 5 is moving from the outermost track to the innermost track ``4'', and outputs image data of the period not stored on the magneto-optical disk 4. These 21-'i data conversion circuit 30, INAM 31, and readout control circuit 32 store and output image data without interruption.

Next, the operation of this embodiment with the above configuration will be explained.

As an example, connect a television 7 to the output terminal ``I'' 0, and tune the television 7 and the television tuner 1 to the same station.
・Ru. Since the write hept drive unit 3 performs endless writing as described above, the programs of the stations to which the tuner 1 is tuned are continuously recorded on the magneto-optical disk 4. In this case, when the magneto-optical disk 4 is rewritten, the previous data is erased, and the amount of image information that can be stored on the magneto-optical disk 4 is determined by the size and track density of the disk. In the example, Tb-Fe with a diameter of 30 cm
- When a Go-based magneto-optical disk was used, about 30 minutes of image information could be recorded. Furthermore, as described above, the image data during the period in which the write head driving unit 3 cannot write is sequentially updated and recorded in the rtAM 31.

Next, when the operation unit is operated and the read command data and track position designation data are supplied to the read pickup drive unit 5, the read pickup drive unit 5 moves the magneto-optical disk 4 from the track designated by the track position designation data. Start reading. After that, the read pickup drive
The read tracks with l<5 are sequentially updated and the read process continues. In this case, if the read command data has not been stopped after the image data of the outermost track has been read, the read pickup drive unit 5
The optical head 21 searches for the innermost track and starts the read process again from the innermost track. Then, while the read pickup drive section 5 searches for the innermost track, the read control circuit 32/J<I"jAM3
Read the data in 1. Therefore, the image data output from the demodulation circuit 6 becomes continuous image data.

Then, when the display on the television 7 is switched from the signal of the built-in tuner to the output signal of the demodulation circuit 6, the image data of the time corresponding to the specified track is displayed on the television 7.

As described above, by appropriately reading the data recorded on the magneto-optical disk 4 and the data in the RΔM 31, it is possible to instantaneously view images from up to 30 minutes before the present time.

Therefore, for example, if 15 minutes have passed after a two-hour program has been broadcast, the video tape recorder will
You cannot watch the program from the beginning until you wait for 1 hour and 45 minutes until the recording ends, and it takes 3 hours and 45 minutes to finish watching the program, but in this example. According to the program, you can instantly watch a program from the beginning, so it only takes two hours to finish watching the program.

In the embodiment, one set of the write head drive unit 3 and the read pickup drive unit 5 is provided, and the configuration is configured such that recording is performed for any one channel, but multiple sets of these are provided to perform recording for a plurality of channels. It may be configured to record both at the same time.

For example, as shown in FIG. 3, a magneto-optical disk 4.4.
A write head drive section 3 and a read pickup drive section 5 are provided for each of the two sides of the 4, and furthermore, a television tuner I, an FM modulation circuit 2, a binary data converting circuit 30, and an IAM 3 are provided.
1. The same number of sets of read control circuits 32 are provided. With the above configuration, it is possible to create a system in which images of any six stations over the past 30 minutes are constantly recorded.

Furthermore, in each of the above embodiments, if the image data during the unrecordable period of the write hept drive unit 3 is not particularly required, the binary data conversion circuit and the I"tAM311 readout control circuit 32 are not provided to simplify the configuration. It's good.

"Effect of the invention" As explained above, according to the invention described in claim 1,
a write processing unit that sequentially writes image data corresponding to the supplied image signal to each track of the optical disk, returns to the first track and repeats writing when writing of all the tracks is completed; Since the optical disc is equipped with a read processing unit that sequentially reads out data from designated tracks in the writing order, the optical disc can always store image data for a predetermined period of time from the present time. The data can be read out in order starting from the data corresponding to the desired time.

According to the second aspect of the invention, in addition to the configuration of the above invention, during the period from when the write processing unit finishes writing to the last track to when it starts rewriting to the first track, a semiconductor memory that stores image data corresponding to the image signal; and a semiconductor memory that stores image data corresponding to the image signal; and Since it is equipped with an output switching unit that changes the read signal to the output signal of the readout means and outputs it, image data of a period that cannot be stored by the write processing unit can be stored in the semiconductor memory, and this image data can be stored in the semiconductor memory. By using this, image data can be read out without any time interruption.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.
FIG. 2 is a block diagram showing the configuration of the write head drive section 3 and the read pickup drive section 5, and FIG. 3 is a block diagram showing a modification of this embodiment. 3...t4F writing head drive section (writing processing section),
4... magneto-optical disk (optical disk), 5...
... Read pickup drive section (read processing section), 30...
...Binary data conversion circuit, 31...RAM
(semiconductor memory), 32...read control circuit (output switching section).

Claims (2)

[Claims] (1) a write processing unit that sequentially writes image data corresponding to the supplied image signal to each track of the optical disk, and when writing of all the tracks is completed, returns to the first track and repeats writing; An image storage device comprising: a read processing section that sequentially reads from designated tracks on the optical disc in the writing order. (2) a write processing unit that sequentially writes image data corresponding to the supplied image signal to each track of the optical disk, and when writing of all the tracks is completed, returns to the first track and repeats writing; a read processing unit that sequentially reads from designated tracks in the optical disc in the writing order; and a time between the time when the write processing unit finishes writing the last track and starts rewriting to the first track. , a semiconductor memory that stores image data corresponding to the image signal; and a semiconductor memory that stores image data corresponding to the image signal; and an output switching unit configured to output the readout signal of the readout signal in place of the output signal of the readout processing unit.