JP2000137920A - Optical disk system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To absorb frequency fluctuation occurring when a rotary speed of a disk is changed into a track jump phase and to prevent the frequency fluctuation from affecting recording/reproducing of a track address by constituting the track jump phase before a track address phase. SOLUTION: A TJ phase generation circuit 2 counts a period required for the TJ by using an inputted TACH signal to generate the TJ phase. Then, a TA phase generation circuit 3 counts the period required for the TA succeeding to the TJ to generate the TA phase. Then, a recording data phase generation circuit 4 counts the period required for the recording data succeeding to the TA, and after the circuit 4 generates a recording data phase, the residual period until a next TACH signal input 1 becomes a residual area phase. Further, a number of revolution control circuit 6 controls the rotation of the disk based on the TACH signal input 1, and thereafter, by constituting the TJ phase, the large frequency fluctuation occurring in the number of revolution control circuit 6 is absorbed into the TJ phase.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk system, and more particularly, to a signal format formed on a track of an optical disk.

[0002]

2. Description of the Related Art In the format of an optical disc,
Although there are various types, in order to record a video signal, an audio signal, and the like input in real time, one round of a track is composed of a track address phase (hereinafter, referred to as a TA phase), a recording data phase, and a track jump phase (hereinafter, referred to as a track jump phase). TJ phase).

In such a system, one track is divided into several sectors as in the case of a computer, and recording, verifying, retrying, etc. are not performed in the sector unit. Recording / reproduction is performed without retry.

In such a format, the TA indicating the position of the disk is the most important in performing a continuous operation.

As a reference phase signal for one rotation of the optical disk,
An optically detectable unevenness is provided at one place on the optical disk itself, and a signal obtained therefrom is defined as a TACH signal.
The TA phase, which is the most important, is arranged after the input of the TACH signal so that it can be reliably detected, followed by the recording data phase and the TJ phase to constitute one track.

An example of a conventional optical disk system is disclosed in Japanese Patent Application Laid-Open No. 8-255358.

In the optical disk system disclosed in Japanese Patent Application Laid-Open No. 8-255358, the TJ phase is described at the end of the data in FIG. TJ is performed after recording the data amount in each track from a signal. In other words, this corresponds to the configuration of the TA phase, the recording data phase, and the TJ phase after the input of the TACH signal.

FIG. 7 is a block diagram showing a configuration example of a conventional optical disk system.

In this conventional example, as shown in FIG. 7, a TA phase generation circuit 103 which counts a period required for TA based on a TACH signal input 101 and generates a TA phase,
After the TA phase is generated by the A phase generation circuit 103, a period required for the recording data is counted, and the recording data phase generation circuit 104 generates the recording data phase. Is generated, a TJ phase generating circuit 102 that generates a TJ phase,
And a rotation speed control circuit 106 for controlling the rotation speed based on the ACH signal input 101.

FIG. 8 is a diagram showing an example of a configuration on a track of a conventional optical disk.

As shown in FIG. 8, in the conventional example, T
From ACH signal input, TA phase, recording data phase, TJ
Phase.

In this conventional example, the TJ phase becomes larger toward the outer periphery.
Some of them have a fixed time, others have different tracks, and various phases can be considered depending on the system.

[0013]

Generally, CLV and ZC
In the LV, when the rotation speed of the disk is changed, it must be performed with reference to some phase. However, when the phase other than the TACH signal input phase is set as a reference, the time reference phase in each track differs. As a result, it is impossible to accurately define one rotation of the disk, and it is also impossible to define the recording data rate to the disk or the input data rate to the device. Therefore, the TACH signal input phase is a reference when changing the rotation speed of the disk. Have been.

As described above, the change point of the disk rotation speed is the input phase of the TACH signal. When the disk rotation speed is changed, the actual rotation speed of the apparatus changes abruptly after the input of the TACH signal. Do not mean.

FIG. 9 is a diagram for explaining a change in the disk rotation speed.

As shown in FIG. 9, when the disk rotation speed is changed, it takes some time for the spindle motor to follow, and overshooting and undershooting are repeated toward the target rotation speed. And the actual rotation speed is settled to the changed rotation speed.

For this reason, in a system in which the TA phase, the recording data phase, and the TJ phase are configured from the TACH signal input as in the above-described conventional optical disk system, the most important timing is obtained at the timing when the speed fluctuation becomes the largest. A TA phase is formed. Therefore, when recording is performed in such a situation, the TA of the correct frequency cannot be recorded due to the frequency fluctuation caused by the rotation of the disc not being constant, even though the recording clock is constant, and Even when a TA is recorded at a constant frequency, there is a problem in that a frequency variation similarly occurs at the time of reproduction, and a correct TA cannot be reproduced.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the conventional technology, and has as its object to provide an optical disk system capable of suppressing frequency fluctuations when changing the disk rotation speed. And

[0019]

In order to achieve the above object, the present invention provides an optical disk system for forming a track address phase, a track jump phase and a recording data phase on a disk. An area other than the track address phase and the recording data phase is configured.

Further, the area formed before the track address is an area for absorbing a frequency fluctuation generated when the rotation speed of the disk is changed.

Further, in an optical disk system for configuring a track address phase, a track jump phase and a recording data phase on a disk, the track jump phase is configured before the track address phase.

Further, a part of the remaining area phase excluding the track jump phase, the track address phase and the recording data phase in one track before the track jump phase is constituted.

Further, a remaining area phase other than a part of the remaining area phase formed before the track jump phase is formed after the track jump phase, the track address phase and the recording data phase. And

Further, the present invention is characterized in that a remaining area phase excluding the track jump phase, the track address phase and the recording data phase in one track is formed before the track jump phase.

(Operation) In the present invention configured as described above, since the track jump phase is formed before the track address phase, the frequency fluctuation that occurs when the rotational speed of the disk is changed causes the track jump phase to change. It is absorbed, and the influence of frequency fluctuation on recording and reproduction of the track address is eliminated.

[0026]

Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) FIG. 1 is a block diagram showing a first embodiment of the optical disk system of the present invention.

In this embodiment, as shown in FIG. 1, a period required for TJ is counted based on the TACH signal input 1 and TJ is counted.
A TJ phase generation circuit 2 for generating a phase, and a TA phase generation circuit 3 for counting the time required for TA after the TJ phase is generated by the TJ phase generation circuit 2 and generating a TA phase
And a recording data phase generation circuit 4 for counting a period necessary for recording data after the TA phase is generated and generating a recording data phase, and a rotation speed control circuit for controlling the rotation speed based on the TACH signal input 1. The period from the end of the recording data phase to the next input of the TACH signal 1 is the remaining area phase 5. If one track is composed of all of the TJ phase, the TA phase, and the recording data phase, the remaining area phase 5 disappears, but if there is any remaining, this becomes the remaining area phase 5.

FIG. 2 is a diagram showing a configuration on a track of an optical disk in the optical disk system shown in FIG.

As shown in FIG. 2, in this embodiment, TA
The TJ phase, the TA phase, and the recording data phase from the input of the CH signal are the remaining area phase until the input of the next TACH signal.

The operation of the optical disk system configured as described above will be described below.

When a TACH signal, which is a reference once per rotation, is detected from the optical disk, the detected TACH signal is input via the TACH signal input 1.

First, in the TJ phase generation circuit 2, a period necessary for TJ is counted using the input TACH signal, and a TJ phase is generated. For example, during CUE_UP to the recording start track, one revolution makes one revolution, so the servo must jump to the original track and settle during the TJ phase. Also, at the time of variable speed reproduction, several track jumps are required. The time required for this is specified and counted.
J is performed.

Next, in the TA phase generation circuit 3, TJ
The period required for the subsequent TA is counted, and a TA phase is generated.

Next, in the recording data phase generation circuit 4, a period necessary for the recording data following the TA is counted, and a recording data phase is generated.

Thereafter, the remaining period until the next TACH signal input 1 is set as the remaining region phase.

In the rotation speed control circuit 6, the TAC
The rotation of the disk is controlled based on the H signal input 1, and the spindle motor follows the target rotation speed and performs a settling operation.

Here, as shown in FIG. 9, when the rotation speed of the disk is changed, the rotation speed first largely fluctuates,
Repeat overshooting and undershooting and settle gradually. Therefore, by configuring the TJ phase after the input of the TACH signal, a large frequency variation generated by the rotation speed control circuit 6 is absorbed in the TJ phase. As a result, the frequency fluctuation is weakened at the time of the next TA phase, and the influence of the recording / reproduction of the track address due to the frequency fluctuation, which has been caused by configuring the TA phase after the input of the TACH signal, can be suppressed. .

When the influence of the frequency fluctuation is long,
The influence not only on the TA but also on the subsequent recording data phase can be similarly suppressed.

(Second Embodiment) FIG. 3 is a block diagram showing a second embodiment of the optical disk system of the present invention.

In the present embodiment, as shown in FIG. 3, the residual region phase 5 shown in FIG. 1 is divided into a residual region phase generation circuit 7 and a residual region phase 8, and the residual region phase generation circuit 7 is placed before the TJ phase. The other remaining area phase 8 is formed at the end of the track.

FIG. 4 is a diagram showing a configuration on a track of an optical disk in the optical disk system shown in FIG.

As shown in FIG. 4, in this embodiment, not all of the remaining region phase is formed at the end of the track, but a certain amount of the remaining region phase is determined by the TACH signal input 1.
And the remaining region phase generation circuit 7, and the rest is formed as the remaining region phase 8 at the end of the track.

As a result, the first large frequency fluctuation caused by the rotation speed change in the rotation speed control circuit 6 from the TACH signal input 1 is caused by the remaining region phase and the TJ phase by the remaining region phase generation circuit 7 wider than the TJ phase alone. It is absorbed and the influence on the subsequent TA phase is reduced as compared with that shown in the first embodiment.

(Third Embodiment) FIG. 5 is a block diagram showing a third embodiment of the optical disk system of the present invention.

In this embodiment, as shown in FIG. 5, the remaining area phase 5 shown in FIG. 1 is arranged before the TJ phase.

FIG. 6 is a diagram showing a configuration on a track of an optical disk in the optical disk system shown in FIG.

As shown in FIG. 6, in the present embodiment, not all of the remaining region phase is formed at the end of the track, but the remaining region phase generation circuit 9 starts from the TACH signal input 1.
, And then the TJ phase.

As a result, the first large frequency fluctuation caused by the rotation speed change in the rotation speed control circuit 6 from the TACH signal input 1 is caused by the remaining region phase and the TJ phase by the remaining region phase generation circuit 9 wider than the TJ phase alone. It is absorbed and the influence on the subsequent TA phase is reduced as compared with that shown in the first embodiment.

In the second and third embodiments described above, if the influence of the frequency fluctuation is long, not only the TA but also the subsequent recording data phase is similarly affected. Can be suppressed.

[0051]

Since the present invention is configured as described above, it has the following effects.

By configuring the track jump phase next to the TACH signal input phase, the TACH signal
Since the influence of the first large frequency fluctuation due to the change in the number of revolutions starting from the signal input phase is absorbed, it is possible to perform recording and reproduction of the track address in which the influence of the frequency fluctuation during the track address phase is reduced.

Further, by forming the remaining area phase next to the TACH signal input phase and the track jump phase next, the influence of the first large frequency fluctuation due to the change in the rotation speed starting from the TACH signal input phase is absorbed. Therefore, it is possible to perform recording and reproduction of the track address in which the influence of the frequency fluctuation during the track address phase is reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a first embodiment of an optical disk system according to the present invention.

FIG. 2 is a diagram showing a configuration on a track of an optical disc in the optical disc system shown in FIG. 1;

FIG. 3 is a block diagram showing a second embodiment of the optical disc system of the present invention.

FIG. 4 is a diagram showing a configuration on a track of the optical disc in the optical disc system shown in FIG. 3;

FIG. 5 is a block diagram showing a third embodiment of the optical disc system of the present invention.

FIG. 6 is a diagram showing a configuration on a track of an optical disc in the optical disc system shown in FIG. 5;

FIG. 7 is a block diagram illustrating a configuration example of a conventional optical disk system.

FIG. 8 is a diagram showing an example of a configuration on a track of a conventional optical disc.

FIG. 9 is a diagram for explaining a change in disk rotation speed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 TACH signal input 2 TJ phase generation circuit 3 TA phase generation circuit 4 Recording data phase generation circuit 5, 8 Remaining area phase 6 Rotation speed control circuit 7, 9 Remaining area phase generation circuit

Claims (6)

[Claims] 1. An optical disk system for configuring a track address phase, a track jump phase and a recording data phase on a disk, wherein an area other than the track address phase and the recording data phase is configured before the track address phase. An optical disc system characterized by the following. 2. The optical disk system according to claim 1, wherein the area configured before the track address is an area that absorbs a frequency fluctuation that occurs when the rotation speed of the disk is changed. Optical disk system. 3. An optical disk system for configuring a track address phase, a track jump phase, and a recording data phase on a disk, wherein the track jump phase is configured before the track address phase. 4. The optical disc system according to claim 3, wherein a part of the remaining area phase excluding the track jump phase, the track address phase and the recording data phase in one track before the track jump phase is formed. An optical disk system, comprising: 5. The optical disc system according to claim 4, wherein the remaining area phase other than a part of the remaining area phase formed before the track jump phase is set to the track jump phase, the track address phase, and the track address phase. An optical disc system comprising a recording data phase. 6. The optical disk system according to claim 3, wherein a remaining area phase excluding the track jump phase, the track address phase, and the recording data phase in one track is formed before the track jump phase. Characteristic optical disk system.