JPS63167472A - System for controlling rotation of driving motor for information recording medium disk - Google Patents

Abstract

PURPOSE:To accelerate automatic control on prescribed rotating speed and to simplify constitution, by controlling the rotating speed of a driving motor by comparing the time length of the signal part with specific pulse width of a DCM signal with a reference time length. CONSTITUTION:A pulse having the maximum pulse width is detected out of digital signals from a disk D by a frame pulse detection circuit FPD, and it is compared with the reference time length at a decision circuit FLJ, and different signals based on the size of the difference are outputted. When the difference of the time length is large, the signal to increase the rotating speed of the driving motor Md steeply is supplied to a motor driving circuit MDSS, then, the rotating speed of the driving motor Md is controlled, and also, when the difference of the time length is small, the signal to decrease the rotating speed of the driving motor Md is supplied, then, the rotating speed of the driving motor Md is controlled with the output signal of a frame phase servo FSCS by the motor driving circuit MDC.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a rotation control system for a drive motor for an information recording medium disk.

(Prior Art) When recording and reproducing various information signals using an information recording medium disc (hereinafter sometimes referred to as a disk), the information signals are recorded while the disk is always rotating at a constant angular velocity. Two methods have been known for a long time: recording and reproducing information signals in a state where the relative linear velocity between the disk and the recording and reproducing element is always constant. Also, regarding discs whose information signal is a video signal (video disc),
Two types of information signals have been used in practice: one in which information signals are recorded and reproduced at a constant angular velocity, and the other in which information signals are recorded and reproduced at a constant linear velocity. Disks that have a mix of recording areas and constant angular velocity recording areas, or disks that have a plurality of constant linear velocity areas each set to have a constant linear velocity at different linear velocities, have also been proposed. ing.

In addition, a disc having a plurality of constant linear velocity recording areas each set to have a constant linear velocity at a different linear velocity, as described above, has a constant linear velocity at a low linear velocity. The area where the linear velocity is constant is used as the recording/playback area for the PCM audio signal, and the area where the linear velocity is constant is used for both the frequency modulated wave signal by the video signal and the PCM audio signal. By using the signal recording and reproducing area of the conventional PC,
A disc with recorded M audio signals.

Since the disc is a combination of the frequency modulated wave signal, the video signal, and the audio signal recorded on the disc, various uses can be considered that make effective use of the respective characteristics of the two discs described above. is expected to develop.

(Problems to be Solved by the Invention) Conventionally, video signals are frequency modulated wave signals and PC
As a rotation control method for a disc drive motor (disc motor) in a playback device for a recorded disc on which both an M-coded audio signal and an M-coded audio signal are recorded at equal linear speeds,
The synchronization signal in the video signal recorded thereon is compared with a separately provided reference signal, and automatic rotation control is performed so that the error signal between the two signals becomes zero.

However, as mentioned above, when the synchronization signal in the video signal is used to control the rotation of the disk motor, the rotation speed of the motor that drives the disk is, for example, 20% or more higher than the normal rotation speed. When the frequency band of the frequency modulated wave signal by the video signal reproduced from the disk changes in width, the frequency band of the frequency modulated wave signal by the video signal reproduced from the disc is from the range of the S curve of the frequency demodulator used for demodulating the video signal in the form of a frequency modulated wave signal. If this happens, the video signal will no longer be demodulated, and automatic rotation control for the disk motor will no longer be performed.

Therefore, conventionally, a specific recording area where a recording signal is recorded that allows reproduction of a signal of approximately the same frequency as the synchronization signal in the video signal when the disk is rotated at a roughly predetermined constant angular velocity has been set on the disk. In addition, the disk motor is provided with a rotary encoder RE as shown in FIG.
When the rotational speed of the disk motor Md deviates significantly from the normal rotational speed, such as when starting the disk motor Md, the rotary encoder RE provided in the disk motor Md mentioned above should Automatic rotation control of the disk motor Md was performed using the signal and the signal reproduced from the above-mentioned specific recording area of the disk motor Md.

That is, in FIG. 2, Md is a disk motor, MD
C is a motor drive circuit, TT is a turntable, D is a disk, PE is a playback element, RE is a rotary encoder, P
UC is a reproduction signal processing circuit, DMOD is a frequency demodulation circuit,
SEP is a synchronous separation circuit, SSG is a reference signal generator, S
CI and SC2 are phase servo circuits, SW is a changeover switch, and when the disc motor Md is started, the movable contact V of the changeover switch SW is switched to the fixed contact S side, and the disc motor Md is connected to the reference signal generator SSG. Phase servo circuit SC1 to which a reference signal is supplied → Fixed contact S of changeover switch SW → Movable contact ■ → Motor drive circuit MDC → Disk drive motor Md → Rotary encoder RE → Phase servo circuit SC1 → One cycle The closed loop causes the frequency and phase of the reference signal supplied from the reference signal generator SSG to the phase servo circuit SC1 to match the frequency and phase of the signal generated from the rotary encoder RE. controlled as follows.

Then, when the relative linear velocity between the disc and the reproducing element approaches the normal state, the movable contact V of the changeover switch SW is switched from the fixed contact S to the fixed contact N side in the above-described one-cycle automatic rotation control system. By switching to another automatic rotation control system, automatic control of the rotation speed of the disk motor Md is performed using the synchronization signal in the video signal recorded on the disk D and the reference signal generated from the reference signal generator SSG. a phase servo circuit S supplied with a reference signal from a reference signal generator SSG, as performed by phase comparison with a signal of
C2 → Fixed contact N of changeover switch SW → Movable contact V →
Motor drive circuit MDC→ As described above, in the conventional system as illustrated in FIG.
There were drawbacks such as the need for E, and improvements were sought.

(Means for Solving the Problems) According to the present invention, an audio signal is recorded in the entire recording area using a PCM signal according to a predetermined modulation method, and a video signal in the form of a frequency modulated wave signal is also recorded in the recording area. A rotation control method of an information recording medium disc drive motor for rotationally driving an information recording medium disc, such as at least a part of the PCM signal reproduced from the information recording medium disc according to a predetermined modulation method. Compare the time length of the signal portion that should have a specific pulse width with the reference time length, and output different signals depending on the magnitude of the difference between the signal portion time length and the reference time length. and a drive motor for an information recording medium disc based on the output signal from the signal time length determining means when the difference between the time length of the signal portion and the reference time length is large. and means for controlling the rotational speed for the information recording medium disk based on the output signal from the signal time length determining means when the difference between the time length of the signal portion and the reference time length is small. A rotation control system for a drive motor for an information recording medium disc, which is equipped with means for controlling the rotational speed of the motor using a phase detection type, and an audio signal recorded by a PCM signal according to a predetermined modulation system are recorded in the entire recording area. A rotation control method of a drive motor for an information recording medium disc for rotationally driving an information recording medium disc, wherein a video signal in the form of a frequency modulated wave signal is also applied to at least a part of the recording area. , compare the time length of a specific signal portion that should have a specific pulse width in a PCM signal according to a predetermined modulation method reproduced from an information recording medium disc with a reference time length, and determine the specific signal portion as described above. a signal time length determination means for outputting different signals depending on the magnitude of the difference between the time length of the specific signal portion and the reference time length, and when the difference between the time length of the specific signal portion and the reference time length is large; In the rotation control method for an information recording medium disk drive motor, the method includes means for controlling the rotational speed of the information storage medium disk drive motor based on the output signal from the signal time length determining means described above. When the difference between the time length of a specific signal portion and the reference time length is small, the rotation speed of the phase detection type is determined for the information recording medium disk drive motor based on the output signal from the signal time length determination means described above. and a first means for controlling the information recording medium disk based on the output signal from the signal time length determining means when the difference between the time length of the specific signal portion and the reference time length is small. a second means for controlling the rotational speed of the information recording medium disc drive motor by phase comparison between the synchronization signal in the video signal reproduced from the reference signal and the reference signal; and the rotation of the information recording medium disc drive motor. A drive motor for an information recording medium disc, comprising means for controlling the rotational speed of the drive motor for an information recording medium disc by selecting the first means and the second means according to the state. This provides a rotation control method.

(Example) Hereinafter, specific contents of the rotation control method of the information recording medium disc drive motor of the present invention will be explained in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram of an embodiment of a rotation control system for a drive motor for an information recording medium disk according to the present invention.

In the recording device shown in the first diagram, Md is a disk motor;
MDCs and MDCv are motor drive circuits, TT is a turntable, D is a disk, PE is a playback element, RE is a rotary encoder, PUC is a playback signal processing circuit, DMOD is a frequency demodulation circuit, SEP is a synchronization separation circuit, and SSG is a Reference signal generator, SC is phase servo circuit, swt, SW2
is a changeover switch, HPF is a high-pass filter, LPF is a low-pass filter, EQC is an equalizer circuit, FPD is a frame pulse detection circuit, FLJ is a frame pulse width determination circuit, FSC is a frame phase servo circuit, The movable contact V of the changeover switch SW2 is switched to the fixed contact S side when the disc motor Md is started or when the rotational speed of the disk motor Md is significantly different from a predetermined rotational speed due to other circumstances.

When the disc D to be played is a so-called compact disc, the changeover switch SWI switches its movable contact V to the fixed contact CD side, and also switches the disc D to be played back to the fixed contact CD side. In the case of a disc on which a PCM audio signal and a video signal in the form of a frequency modulated wave signal are recorded, the movable contact V is switched to the fixed contact CD, V side.

If the disc D to be played back is a so-called compact disc, the digital signal obtained by signal processing the information signal read from the disc D by the playback element PE in the playback signal processing circuit PUC. The disc D, which is supplied to the frame pulse detection circuit FPD through the movable contact V and the fixed contact CD of the changeover switch SW1, and which is to be played back, records an audio signal using a PCM signal according to a predetermined modulation method. In the case of a disc D, in which a video signal in the form of a frequency modulated wave signal is also provided in at least a portion of the recording area.

A digital signal obtained by processing the information signal read from the disk D by the reproduction element PE in the reproduction signal processing circuit PUC is transmitted to the low-pass filter LPF, the equalizer circuit EQC, and the movable contact V and fixed contact of the changeover switch SW1. Frame pulse detection circuit FPD via CDV
The frame pulse detection circuit F
A digital signal is supplied to the PD.

The frame pulse detection circuit FPD selects a pulse with the longest pulse width from among the digital signals supplied to it (a specific signal portion that should have a specific pulse width in a PCM signal that follows a predetermined modulation method and is reproduced from a disk).
. . . When the modulation method of the digital signal is the EFM method, the pulse recorded as an 11T pulse in the disk space D is detected and supplied to the frame pulse width determination circuit FLJ.

The above-mentioned frame pulse width determination circuit FLJ compares the pulse width of the frame pulse supplied thereto with a reference time length, and determines whether the pulse width of the frame pulse supplied thereto is a predetermined time length (e.g. Different signals are output depending on whether the pulse width is 11T), longer than a predetermined time length, or shorter than a predetermined time length.

In other words, the relative linear velocity between the disk D and the reproduction element PE is significantly lower than a predetermined relative linear velocity, and the pulse width of the frame pulse supplied to the frame pulse width determination circuit FLJ is lower than the predetermined relative linear velocity. If the time length (for example, a pulse width of 11T) is significantly longer than the time length (for example, a pulse width of 11T), an output signal that can rapidly increase the rotational speed of the disk drive motor Md is sent from the motor drive circuit MDCs to the disk drive motor Md. A control signal to be supplied to Md is sent from the frame pulse width determination circuit FLJ to the motor drive circuit MD.
Cs, and when the relative linear velocity between the disk D and the reproduction element PE is significantly higher than a predetermined relative linear velocity, the frame pulse width determination circuit F
If the pulse width of the frame pulse supplied to LJ is significantly shorter than a predetermined time length (for example, a pulse width of 11T), an output signal is generated that can rapidly decrease the rotational speed of the disk drive motor Md. is the motor drive circuit MDCs
A control signal is supplied from the frame pulse width determination circuit FLJ to the motor drive circuit MDCs so that the relative linear velocity between the disc D and the reproduction element PE is set to a predetermined value. , and the pulse width of the frame pulse supplied to the frame pulse width determination circuit FLJ is
If it is close to a predetermined time length (for example, a pulse width of 11T).

An output signal is supplied to the frame phase servo FSC from the frame pulse width determination circuit FLJ, and the output signal of the frame phase servo FSC causes the motor drive circuit MDCs to control the rotation speed of the disk drive motor Md to a predetermined rotation speed. Allows continuous rotation by number.

When the disc motor Md is started, or due to other circumstances, the rotational speed of the disc motor Md is significantly different from the predetermined rotational speed, and the movable contact V of the changeover switch SW2 is switched to the fixed contact S side. In this state, the rotation control system of the information recording medium disk drive motor shown in the first diagram is as follows: disk motor Md - playback element PE -> playback signal processing circuit PUC -> fixed contact CD of selector switch SW1.
(or low pass filter LPF → equalizer circuit EQC
→ fixed contact CDV of changeover switch SWI) → movable contact V → frame pulse detection circuit FPD → frame width determination circuit FLJ → motor drive circuit MDCs → motor drive circuit MDCs) fixed contact S of changeover switch SW2 →Same movable contact V→Disc motor Md→, −
The closed-loop automatic rotation control circuit controls the disc motor Md so that its rotational speed rapidly approaches the normal rotational speed, so that the relative linear velocity between the disc D and the reproduction element PE reaches a predetermined relative linear velocity. After the state is close to , and the pulse width of the frame pulse supplied to the frame pulse width determination circuit FLJ is close to a predetermined pulse width (for example, the pulse width of IIT), the above-mentioned closed loop is completed. The automatic control circuit is the disk motor Md - reproduction element PE → reproduction signal processing circuit PUC → fixed contact CD of changeover switch SW1 (or low-pass filter LPF → equalizer circuit EQC → fixed contact C0V of changeover switch SWI) → same movable Contact V → Frame pulse detection circuit FPD → Frame pulse width judgment circuit FLJ → Frame phase servo circuit FS
C → Fixed contact S of changeover switch SW2 → Movable contact V →
The disk motor Md is automatically controlled by a closed-loop automatic rotation control circuit called disk motor Md to rotate while maintaining its rotational speed at a normal rotational speed.

The rotation control system for the information recording medium disc drive motor shown in the first diagram is such that the disc motor Md is automatically rotated while the movable contact V of the changeover switch SW2 is switched to the fixed contact S side as described above. In addition, the relative linear velocity between the disk D and the reproduction element PE is close to a predetermined relative linear velocity, and the output signal from the frame pulse width determination circuit FLJ is adjusted to the frame phase. After the layering starts to be supplied to the servo circuit FSC, the rotation speed of the disk motor is controlled by phase comparison between the synchronization signal in the video signal reproduced from the disk D and the reference signal generated by the reference signal generator SSG. It can also be implemented in situations where

That is, in this case, when starting the disc motor Md,
Or, due to other circumstances, the rotation speed of the disc motor Md is significantly different from the predetermined rotation speed,
When the movable contact V of the changeover switch SW2 is switched to the fixed contact S side, the rotation control method of the information recording medium disk drive motor shown in FIG.
Reproduction element PE → reproduction signal processing circuit PUC → fixed contact CO of changeover switch SW1 (or low-pass filter LPF →
Equalizer circuit EQC → Fixed contact C0V of changeover switch SWI) → Movable contact V → Frame pulse detection circuit FP
D→Frame pulse width judgment circuit FLJ→Motor drive circuit MDCs→Fixed contact S of selector switch SW2→Movable contact V→Disc motor Md→Disc motor Md is controlled by a closed-loop automatic rotation control circuit. is controlled so that its rotational speed rapidly approaches the normal rotational speed, and the relative linear velocity between the disk D and the reproduction element PE becomes close to a predetermined relative linear velocity, and the frame pulse width can be determined. When the pulse width of the frame pulse supplied to the circuit FLJ becomes close to a predetermined pulse width (for example, the pulse width of IIT), the frame pulse width determination circuit FLJ→frame phase servo path FSC→switches. Fixed contact S of switch SW2 → Movable contact V → Disc motor M
After the time when the operating state changes to d→, the changeover switch S in the closed loop automatic control circuit
The movable contact V of W2 is switched from the fixed contact S side to the fixed contact N side, and the disc motor Md is switched to the reference signal generator SS.
Phase servo @MSC where reference signal is supplied from G →
Motor drive circuit M D Cv → Fixed contact N of changeover switch SW2 → Movable contact V → Disc motor Md → Turntable TT → Disc D → Reproduction element PE → Reproduction signal processing circuit PUC → High pass filter HPF → Frequency demodulation Vessel D
Through a closed loop of MOD→synchronous separation circuit SEP→phase servo circuit SC→the reference signal generator S
The rotational speed and phase of the disk motor Md are adjusted so that the frequency and phase of the reference signal supplied from the SG to the phase servo circuit SC match the frequency and phase of the synchronization signal in the video signal reproduced from the disk D. is controlled.

The switching control signal used to switch the movable contact V of the changeover switch SW2 is determined when the relative linear velocity between the disc D and the reproduction element PE is close to a predetermined relative linear velocity, and the frame pulse width is When the pulse width of the frame pulse supplied to the determination circuit FLJ becomes close to a predetermined pulse width (for example, a pulse width of 11T), the frame pulse width determination circuit FLJ changes the frame phase servo circuit FSG. It is possible to use a signal supplied to

(Effects of the Invention) According to the present invention, an audio signal is recorded in the entire recording area using a PCM signal according to a predetermined modulation method, and a video signal in the form of a frequency modulated wave signal is also recorded in at least a part of the recording area. A rotation control system for an information recording medium disc drive motor for rotationally driving an information recording medium disc, such as a PCM signal reproduced from an information recording medium disc according to a predetermined modulation method, having a specific pulse width. Compare the time length of the signal portion that should have the above-mentioned signal portion with the reference time length, and determine the signal time length to output different signals depending on the magnitude of the difference between the time length of the signal portion and the reference time length. means for controlling the rotational speed of the information recording medium disc drive motor based on the output signal from the signal time length determination means when the difference between the time length of the signal portion and the reference time length is large; the means to do so,
When the difference between the time length of the signal portion and the reference time length is small, the rotation speed of the phase detection type is determined for the information recording medium disc drive motor based on the output signal from the signal time length determination means described above. An audio signal is recorded in the entire recording area using a PCM signal according to a rotation control method of a drive motor for an information recording medium disc, and a predetermined modulation method, and a frequency modulated wave signal. A rotation control system for an information recording medium disc drive motor for rotationally driving an information recording medium disc in which a video signal of the form is also formed at least in a part of the recording area, the method comprising: Compare the time length of a specific signal portion that should have a specific pulse width in a PCM signal according to a predetermined modulation method with a reference time length, and determine the difference between the time length of the specific signal portion and the reference time length. A signal time length determination means that outputs different signals depending on the magnitude of the difference, and a signal time length determination means when the difference between the time length of the specific signal portion and the reference time length is large. In a rotation control system for a drive motor for an information recording medium disk, which is equipped with a means for controlling the rotation speed of the drive motor for an information storage medium disk based on an output signal of A first method for performing phase detection type rotational speed control on the information recording medium disc drive motor based on the output signal from the above-described signal time length determination means when the difference with the time length is small.
and a video signal reproduced from an information recording medium disc based on the output signal from the signal time length determining means when the difference between the time length of the specific signal portion and the reference time length is small. a second means for controlling the rotational speed of the information recording medium disk drive motor by phase comparison between the synchronization signal and the reference signal; This is a rotation control system for an information recording medium disk drive motor, comprising means for selecting the first means and the second means to control the rotation speed of the information recording medium disk drive motor. , there is no need for a rotary encoder RE to control the rotation of the disk motor at startup unlike in the conventional rotation control system for a drive motor for an information recording medium disk, and there is no need for a rotary encoder RE to control the rotation of the disk motor at the time of startup. Even if a speed range is provided, the rotation speed of the disc can be quickly and automatically controlled to a predetermined rotation speed. Since the rotation speed can be automatically controlled using the synchronization signal, the configuration can be simplified.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of a rotation control method for a drive motor for an information recording medium disk according to the present invention, and FIG. 2 is a block diagram of an example of a conventional method. Md...Disk motor, MDC, MDCs, M'D
Cv...Motor drive circuit, TT...Turntable, D...Disc, PE...Reproduction element, RE...
Rotary encoder, PUC...playback signal processing circuit,
DMOD...Frequency demodulation circuit, SEP...Synchronization separation circuit, SSG...Reference signal generator, SCI, 5C2
8C...Phase servo circuit, SW, SWI, SW2...
・Selector switch, HPF...High pass filter, LPF
...Low pass filter, EQC...Equalizer circuit,
FPD: Frame pulse detection circuit, FLJ: Frame pulse width determination circuit, FSC: Frame phase servo circuit. -Pano' h Figure 2

Claims (1)

[Claims] 1. An audio signal is recorded in the entire recording area using a PCM signal according to a predetermined modulation method, and a video signal in the form of a frequency modulated wave signal is also recorded in at least a part of the recording area. This is a rotation control system for an information recording medium disk drive motor for rotationally driving an information recording medium disk, which controls the rotation of a PCM signal reproduced from an information recording medium disk according to a predetermined modulation method with a specific pulse width. Signal time length determination means that compares the time length of the signal portion that should be present with a reference time length and outputs different signals depending on the magnitude of the difference between the time length of the signal portion and the reference time length. and controlling the rotation speed of the information recording medium disc drive motor based on the output signal from the signal time length determining means when the difference between the time length of the signal portion and the reference time length is large. and a phase detection type for the drive motor for the information recording medium disk based on the output signal from the signal time length determination means when the difference between the time length of the signal portion and the reference time length is small. A rotation control method 2 of a drive motor for an information recording medium disk, which includes a means for controlling the rotation speed of an information recording medium disk, in which an audio signal is recorded in the entire recording area by a PCM signal according to a predetermined modulation method, and a frequency A rotation control system for an information recording medium disk drive motor for rotationally driving an information recording medium disk in which a video signal in the form of a modulated wave signal is also provided at least in a part of the recording area, the method comprising: Compare the time length of a specific signal portion that should have a specific pulse width in a PCM signal according to a predetermined modulation method with a reference time length, and compare the time length of the specific signal portion and the reference time. means for determining the signal time length, which outputs different signals depending on the magnitude of the difference between the signal time length and the reference time length; and In a rotation control method for a drive motor for an information recording medium disc, which includes means for controlling the rotation speed of the drive motor for an information recording medium disc based on an output signal from a determining means, the time length of the specific signal portion is A first method for performing phase detection type rotational speed control on the information recording medium disk drive motor based on the output signal from the signal time length determining means when the difference between the signal time length and the reference time length is small. and a video signal reproduced from an information recording medium disk based on the output signal from the signal time length determining means when the difference between the time length of the specific signal portion and the reference time length is small. a second means for controlling the rotational speed of the information recording medium disc drive motor by phase comparison between the synchronization signal and the reference signal; A rotation control system for a drive motor for an information recording medium disc, comprising means for controlling the rotational speed of the drive motor for an information recording medium disc by selecting the first means and the second means.