JPH07284066A - Disk device - Google Patents

Abstract

PURPOSE:To continuously reproduce plural reproduction areas on a disk without interruption by storing data sought and read by a reproducing head in a buffer memory and then outputting them from the buffer memory at the reproduction starting time. CONSTITUTION:The reproducing head 3 successively seeks and reads the areas of the disk 1 where corresponding video signals or audio signals are recorded corresponding to set continuous reproduction areas. Then, the reproducing signals of the successive areas are stored through a reproducing circuit in the buffer memory. Then, after an amount enough not to interrupt reproduction output by the seeking of the head 3 is stored, the data stored in the buffer memory are outputted during seeking time when the reproduction starting time arrives. By controlling data delay by the buffer memory, the plural reproduction areas on the disk are easily and continuously reproduced without the interruption.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a means for continuously reproducing a plurality of continuous areas from a disk on which video or audio is recorded, and a method for starting recording of video or audio on the disk. The present invention relates to a means for delaying video or audio by reproducing the video or audio after a certain time.

[0002]

2. Description of the Related Art FIG. 2 is a diagram showing an example of a means for continuously reproducing a plurality of continuous areas from a conventional disk on which video is recorded. At the time of recording, the disk rotates at 1800 rpm and is in rotation synchronization with the video synchronization signal. That is, two fields of video are recorded in one rotation. The head control circuit performs control such as tracking so that the reproduction signal of the video recorded on the disk can be taken out by the reproduction head. The reproduction signal from the reproduction head is converted into a video signal by the reproduction circuit. The converted video signal is temporarily stored in the buffer memory. The buffer memory is set to continuously play a plurality of areas on the disc from the outside, that is, has a capacity sufficient to store the video signal for the maximum time required for the playback head to seek by the continuous playback area setting. is there. Data can be written to the buffer memory at a transfer rate higher than the transfer rate of the video signal, and reading from the buffer memory is performed at the transfer rate of the video signal.
When a plurality of areas of this disc are continuously reproduced, a video signal for the maximum time required for the reproducing head to seek can be stored in the buffer memory before the reproduction of one continuous reproducing area on the disc is completed. In this way, the disc is rotated faster than during recording, and while the playback head seeks to the next playback area, the video signal is output from the buffer memory and playback of the next playback area is started before the buffer memory becomes empty. In addition, the reproducing head, the motor and the buffer memory are controlled to continuously output the video signals of the two reproducing areas.

FIG. 3 is a diagram showing an example of a conventional means for delaying a video signal for a predetermined time. The disk is 1800
It is rotating at rotation / minute and is in rotation synchronization with the video synchronization signal. That is, the video of 2 fields is recorded / reproduced in one rotation. It is assumed that the disc can record the maximum Tr time. The head control circuit 1 performs control such as tracking so that the reproduction head 1 can take out a reproduction signal of an image recorded on a disk. A reproduction signal from the reproduction head 1 is converted into a video signal by the reproduction circuit 1. The head control circuit 3 controls tracking and the like so that the reproduction head 2 can take out a reproduction signal of an image recorded on the disk. The reproduction signal from the reproduction head 2 is converted into a video signal by the reproduction circuit 2. The video signals output from the reproduction circuit 1 and the reproduction circuit 2 are respectively input to the video signal switching circuit and controlled so that either one of the video signals is output to the outside. The recording video signal input from the outside is input to the buffer memory. The capacity of the buffer memory is equal to or larger than the product of the size corresponding to the video signal for the time required for the recording head to seek from the beginning to the end of the recording area of the disc and start reproduction, and recording time setting / Tr. .
The recorded video signal is input to the recording circuit through the buffer memory. The input recording video signal is converted into a recording signal for recording on the disc by the recording circuit. The converted recording signal is input to the recording head and recorded on the disc. The head control circuit 2 controls tracking and the like so that a recording head can record a video signal on a disk.

A video signal from the outside is transmitted for Td time (Td ≦ T
r) In the case of delaying, the video signal is recorded from the beginning of the recording area of the disc, and after Td time, the reproducing head 1 reproduces from the beginning of the recording area and outputs to the outside. When the recording head has recorded to the end of the recording area, seek is performed and recording is restarted from the beginning of the recording area. When seeking, the video signal to be recorded at that time is stored in the buffer memory. When the reproducing head 1 has reproduced to the end of the recording area, the reproducing head 2 stands by at the beginning of the recording area and starts reproducing continuously to the reproducing head 1. On the contrary, when the reproducing head 2 reproduces to the end of the recording area, the reproducing head 1 stands by at the beginning of the recording area and starts reproducing continuously to the reproducing head 2. By controlling in this manner, the video signal is delayed.

[0005]

However, in the above-mentioned conventional continuous reproducing apparatus, since the rotation speed of the disk has to be changed, the rotation speed cannot be rapidly changed when the continuous reproduction area is short. Therefore, the video signal for the seek time cannot be stored in the buffer memory and continuous reproduction cannot be performed. Further, it becomes difficult to realize the tracking of the reproducing head, the PLL for binarizing the reproduced signal, and the motor rotation control. Further, since the video signal delay device as described above, which requires continuous reproduction, also records at the same time, the rotation speed of the disc, which is one of the recording conditions, cannot be changed. Therefore, the conventional continuous reproduction method cannot be used, and thus two sets of recording and reproducing heads are required.

[0006]

In order to solve the above problems, the disk apparatus of the present invention is a disk which rotates at a constant rotation speed, and enables continuous reproduction of a plurality of continuous areas with one set of reproducing heads. To do. In addition, a recording / reproducing head 1 is provided with a disc device that delays the image signal by recording the image signal from the outside on the disc and continuously reproducing it.
This is possible with one group and one group of recording heads.

The continuous reproduction disk device calculates a time at which reproduction is interrupted by a seek from a continuous reproduction area set from the outside in advance, starts reproduction before the reproduction start time, and reproduces the video for the time at which reproduction is interrupted in the buffer memory. The signal is stored and the video signal is output to the outside through the buffer memory from the reproduction start time. The reproducing head seeks to reproduce the next reproducing area, and outputs the video signal from the buffer memory when the reproduction is interrupted.

In another continuous playback disk device, the number of seeks N and the time T0 at which playback is interrupted at each seek from the continuous playback area set from the outside in advance,
T1, T2, T3. ． ． Calculates TN, starts playback before the playback start time, and stores in the buffer memory the portion where playback is interrupted by a seek before or after the boundary between N continuous playback areas and the next continuous playback area that follows. hand,
Playback is performed from the playback start time, and when the playback head reaches the area stored in the buffer memory, seek is performed to play back the next playback area, and the area stored in the buffer memory is not played back. The video signal is output from the buffer memory during a period during which the reproduced video signal is interrupted from the disc by seeking.

[0009]

With this configuration, although the actual reproduction is interrupted in this way, the video signal is output from the buffer memory during that period, and the video signal is output without interruption when viewed from the outside. Furthermore, continuous reproduction is possible even when the continuous reproduction area is short. Moreover, since the rotation speed of the disk does not change, recording can be easily performed at the same time as reproduction.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a disc reproducing apparatus according to an embodiment of the present invention. The disk 1 is rotating at a constant rotation speed of 1800 rpm.
In addition, the disk 1 is divided into two sectors,
One field of data is recorded in one sector.
The reproducing head reads the data recorded on the disc and sends a reproducing signal to the reproducing circuit. The head control circuit controls tracking of the reproducing head so that the reproducing head can reproduce data from the disk. In the playback circuit,
The reproduction signal is converted into a video signal and input to the buffer memory. The buffer memory is adapted to store a video signal for a total time of moving the reproducing head in each reproducing area. The motor control circuit recognizes the sector from the reproduction signal from the reproduction head, and genlocks the motor based on the phase difference from the image synchronization signal from the outside. The reproduction control circuit controls the reproduction head and the buffer memory as follows according to the continuous reproduction area setting given from the outside. For example, reproduction areas P1, P2, which start reproduction from time Td,
It is assumed that P3, P4, and P5 are set from the outside. The reproduction control circuit takes time T1 required to shift from P1 to P2.
2 and the time T23 required to move from P2 to P3, and P
The time T34 required to move from 3 to P4 and P from P4
The reproduction is started earlier than the time T by a time corresponding to the sum of the time T45 necessary to move to 5, the video signal is stored in the buffer, and the reproduced video signal is not output to the outside. After the time T comes, the reproduced video signal is output from the buffer memory. When the program P1 ends, the reproducing head moves to the program P
Move to area 2. During this period, the reproducing head does not output the reproducing signal for T12 time, but outputs the video signal from the memory. Similarly, the program P3, the program P4, and the program P5 are reproduced, and the video signal is output from the memory while the reproducing head is moving between the programs to realize continuous reproduction.

FIG. 4 is a block diagram showing the structure of a disc reproducing apparatus according to an embodiment of the present invention. The disk 1 is rotating at a constant rotation speed of 1800 rpm. Also,
The disc 1 is divided into two sectors, and one sector of data is recorded in one sector. The playhead reads the data recorded on the disc,
The reproduction signal is sent to the reproduction circuit. The head control circuit controls tracking of the reproducing head so that the reproducing head can reproduce data from the disk. In the reproduction circuit, the reproduction signal is converted into a video signal, and the 1 → 5 switching circuit
-Input to one buffer memory. The output of the buffer memory is output to the outside through the 5 → 1 switching circuit. Note that the 1 → 5 switching circuit and one selection circuit of the 5 → 1 switching circuit are directly connected. The motor control circuit recognizes the sector from the reproduction signal from the reproduction head, and genlocks the motor based on the phase difference from the image synchronization signal from the outside. The reproduction control circuit controls the reproduction head, the 5-1 buffer memory, the 1 → 5 switching circuit, and the 5 → 1 switching circuit according to the continuous reproduction area setting given from the outside as follows. 5 is the number of reproduction areas given from the outside. For example, it is assumed that reproduction areas P1, P2, P3, P4, and P5 that start reproduction from time T are set from the outside. The reproduction control circuit has time T12 required to move from P1 to P2, time T23 required to move from P2 to P3, time T3 required to move from P3 to P4.
4, the time T45 required to move from P4 to P5 is the last T12 hours of P1 and the last T of P2.
The area for 23 hours, the area for the last T34 hours of P3, and the area for the last T45 hours of P4 are reproduced before time T, and stored in 5-1 memories by the 1 → 5 switching circuit. The reproduction is started from the beginning of P1 at time T, and the video signal is output to the outside without passing through the memory. The last T1 of P1
When reaching the area of 2 hours, the reproducing head moves to the head of P2. Meanwhile, the image of the last T12 time of P1 stored in the memory in advance is output to the outside through the 5 → 1 switching circuit. When the output of the video signal from the memory is completed, the reproducing head starts reproducing P2 and outputs it to the outside without passing through the memory. Similarly, with respect to P2, P3, P4, and P5, while the previously stored video signal is being output, the next playback area is moved.

FIG. 5 is a block diagram showing the configuration of a video signal delay device according to an embodiment of the present invention. This device realizes a function of delaying a recording video signal input from the outside by the recording time of the maximum disc and outputting it as a reproduction video signal. The disk 1 is rotating at a constant rotation speed of 1800 rpm. Further, the disc 1 is divided into two sectors, and one sector of data can be recorded in one sector. The recording video signal input from the outside is input to the recording circuit 1, the recording circuit 2, and the 2 → 2 switching circuit. The recording circuit 1 converts an input recording video signal into a recording signal that can be recorded on a disc and drives a recording / reproducing head. The recording circuit 2 converts the input recording video signal into a recording signal that can be recorded on the disc and drives the recording head. Further, the recording / reproducing head reads the data recorded on the disk and sends a reproduction signal to the reproducing circuit.
The head control circuit 1 controls tracking of the recording / reproducing head so that the recording / reproducing head can record on or reproduce from the disc. The head control circuit 2 controls the tracking of the recording head so that the recording head can record on the disk. In the reproduction circuit, the reproduction signal is converted into a video signal and input to the 2 → 2 switching circuit. Two
The → 2 switching circuit selects whether to store the video signal from the reproducing circuit and the recording video signal from the outside in the buffer memory or to input the signal as it is to the 2 → 1 switching circuit. The output of the buffer memory 1 is input to the 2 → 1 switching circuit.
The 2 → 1 switching circuit selects the data from the 2 → 2 switching circuit and the data from the buffer memory 1 and outputs them to the outside. The motor control circuit recognizes the sector from the reproduction signal from the recording / reproducing head, and genlocks the motor based on the phase difference from the image synchronization signal from the outside. The recording / reproducing control circuit includes a recording / reproducing head, a reproducing head, a buffer memory 1, a 2 → 2 switching circuit, and a 2 → 1 switching circuit based on a delay time / recording time setting given from the outside.
Control like. Tr is the time that can be recorded on the disc,
Ta is the time when the recording video signal is input, Td is the delay time given from the outside, and Ts is the maximum time until the recording / reproducing head or the recording head seeks from a certain position on the disk and starts recording / reproducing. Is. Recording / reproduction is performed from the outermost circumference of the disc toward the inner circumference. For example, when recording of a recording video signal from the outside is started from time T and a reproduction video signal is output with a delay of Td, Tr-Td-
Considering the case where the relationship of Ts <Td is established (FIG. 6A), the first 4 × Ts image is reproduced and stored in the buffer memory before the time T + Td, and the disc is continuously reproduced after the time T + Td. Start writing to and reading from the buffer memory. When the recording head performs recording for Tr−Ts, the recording / reproducing head stops reproduction and moves to the outermost circumference, and when the recording head records to the innermost circumference at time T + Tr, recording is switched to the recording / reproducing head. The recording head moves to a position on the inner circumference by Ts from the outermost circumference, and during that time, that is, from time T + Tr to T + Tr + T
Up to s, a recording video signal input from the outside is recorded by the recording / reproducing head, and recording is performed by switching from T + Tr + Ts to the recording head. From time T + Tr + Ts, the recording / reproducing head moves from the outermost circumference to the inner circumference of Tr-Td + 3 * Ts, and starts reproduction from time T + Tr + 2 * Ts. During the period from the time T + Tr-Ts when the recording / reproducing head stops the reproduction to the time T + Tr + 2 * Ts, the video continuously stored in the buffer memory is output to maintain the continuity of the reproduction. At time T + Td + Tr, the reproduction is completed up to the innermost circumference, so the recording / reproducing head moves to a position on the inner circumference Ts from the outermost circumference and starts reproduction from time T + Td + Tr + Td. Record from time T + Td + Tr to T + Td + Tr + Ts /
While the playback head is moving, the video is output from the buffer memory to maintain the playback continuity. After the second lap,
By writing the recorded video signal directly into the buffer, continuity of reproduction can be obtained.

However, when recording of a recorded video signal from the outside is started from time T and a reproduced video signal of a video recorded with a delay of Td is output, a case where the relationship of Tr-Td-Ts ≧ Td is established (see FIG. 6 ( Considering b)), the data to be stored in the memory does not need to be reproduced from the disk and stored in the buffer memory after the time T + Td, that is, after the reproduction is started. -Ts = 3 x Ts, time T + Tr-Ts = Ts
Time T + when data is written to the minute buffer memory and playback is interrupted
Images are output from the buffer memory for T + Tr-Td + 2 * Ts from Tr-Td-Ts and T + Tr + Ts from time T + Tr-Ts to maintain reproduction continuity. In the second and subsequent rounds as well, the continuity of reproduction can be obtained by directly writing the recorded video signal in the buffer.

[0014]

EFFECTS OF THE INVENTION A plurality of areas on a disc on which an image is recorded can be continuously and continuously reproduced by one set of reproducing heads. In addition, the video recorded on the disc by one set of recording head and one set of recording / reproducing head can be reproduced after the maximum disc recording time, and the recorded video signal can be delayed and output.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a disk device according to an embodiment of the present invention.

FIG. 2 is a block diagram showing an example of a conventional disk device.

FIG. 3 is a block diagram showing an example of a conventional disk device.

FIG. 4 is a block diagram showing a configuration of a disk device according to an embodiment of the present invention.

FIG. 5 is a block diagram showing a configuration of a disk device according to an embodiment of the present invention.

FIG. 6 is a time T of the disk device according to the embodiment of the present invention.
Timing diagram of control of the recording head, recording / reproducing head, and buffer memory in an example in which the input video signal is delayed by time Td and output.

[Explanation of symbols]

 1 disk 2 sector 3 reproducing head 4 recording head 5 reproducing head 1 6 reproducing head 2 7 video signal switching circuit 8 recording / reproducing head

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location G11B 27/10 A 8224-5D

Claims (8)

[Claims] 1. A disk which rotates at a constant number of rotations rotationally synchronized with a video synchronizing signal from the outside where a video is recorded, and a reproducing head which extracts a reproduction signal of the recorded video from the disk. A head control circuit for controlling the reproduction head so that a reproduction signal of a video can be taken out, a reproduction circuit for converting a reproduction signal reproduced by the reproduction head into a video signal, and a video signal output from the reproduction circuit is stored. The buffer memory, a plurality of continuous playback ranges and sequences set from the outside, start playback earlier than the playback start time according to the playback start time, and seek the playback in the buffer memory between the plurality of continuous playback ranges. The video signal is output through the buffer memory at the playback start time after storing the video for more than the sum of the times when the playback is interrupted by changing the track. Disk device Gyoshi reproducing head is characterized in that between also provided with a regeneration control circuit for controlling so as to output a reproduced video signal from the buffer memory that seeks. 2. A disk that rotates at a constant number of revolutions in which an image synchronized with an image synchronization signal is recorded, a reproduction head that extracts a reproduction signal of the recorded image from the disk, and the reproduction head. A head control circuit for controlling so that a reproduction signal of the video can be taken out, a reproduction circuit for converting the reproduction signal reproduced by the reproduction head into a video signal, and a buffer memory for storing the video signal from the reproduction circuit, A switching circuit for switching the video signal from the reproduction circuit not passing through the buffer memory and the video signal read from the buffer memory and outputting the same to the outside, and a plurality of continuous reproduction ranges and orders set from the outside and reproduction start time Each continuous playback range for the time required to change the playback track by seeking between the continuous playback ranges calculated from The video of the beginning or the end of the video is played back and stored in the memory respectively, each continuous playback range is played back from the playback start time, the area stored in the memory is not played back, and the playback head moves to the next playback area. A disk device comprising a reproduction control circuit for performing a seek operation and controlling the switching circuit during the seek operation to read out a portion corresponding to a seek section in the memory and output a video signal. 3. An image synchronized with the image synchronizing signal and rotated by T
A disc that rotates at a constant rotation speed that can be recorded for r hours,
A recording / reproducing head for recording an image on the disc or extracting a reproduction signal of an image recorded on the disc, a recording head for recording an image on the disc, and a recording / reproducing head for recording an image signal Alternatively, a head control circuit 1 for controlling so that a video reproduction signal can be taken out, a head control circuit 2 for controlling so that the recording head can record a video signal, and a reproduction signal reproduced by the recording / reproducing head A reproducing circuit for converting into a signal, a buffer memory for storing a video signal from the reproducing circuit, a recording circuit 1 for converting a recording video signal from the outside into a recording signal to be given to the recording / reproducing head, and an external recording circuit. A recording circuit 2 for converting a recording video signal into a recording signal to be given to the recording head, a recording start time set from the outside, and the recording on the disc A video signal equal to or more than the sum of the recording start address and the recording time, and the seek time of the recording / reproducing head and the recording head calculated from the reproduction start time delayed by Td time (Td ≦ Tr) from the recording start time. After being stored in the buffer memory, the reproduction video signal is output to the outside through the buffer memory at the reproduction start time.
A video signal is output from the buffer memory while reproduction is interrupted because the recording / reproducing head changes a reproduction track, and a recording signal is recorded by the recording / reproducing head while recording is interrupted because the recording head changes a recording track. And a recording / reproducing control circuit for controlling so that the video signal during that time is output from the buffer memory and delaying the recording video signal from the outside by the maximum Tr time and outputting it as a reproduction video signal to the outside. Characterized disk device. 4. A disc capable of recording a video for a Tr time, the playback video being started after a delay of Td time (Td ≦ Tr) from the video recording start, and the corresponding video recording being performed while the recording and the playback of the recording head and the recording / playback head are interrupted. 4. The disk device according to claim 3, wherein the signal is stored in a buffer memory from the input recording video signal. 5. The disc device according to claim 1, wherein a disc on which audio is recorded is reproduced. 6. The disc device according to claim 2, which reproduces a disc on which audio is recorded. 7. The disk device according to claim 3, which records / reproduces sound. 8. The disk device according to claim 4, which records / reproduces sound.