JPH1139658A - Groove wobbling data detection method, groove wobbling data detection device, and optical disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of detecting groove wobbling data which has a simple configuration and low power consumption and is advantageous for integration of LSI. SOLUTION: Preformat data recorded by wobbling a groove provided for tracking of an optical disc by frequency modulation is binarized by a detection signal (a) of the preformat data,
Time (c) corresponding to the width of the binarized detection signal (b),
(D) The capacitor is charged by a constant current source or a constant voltage source (e), and the difference in the wobbling period is detected from the difference in the charged voltage (e) of the charged capacitor (g), so that demodulation is performed. It has become.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting groove wobbling data recorded by wobbling (small vibration) a groove provided for tracking an optical disk by frequency modulation, and a groove for executing the method. The present invention relates to a wobbling data detection device and an optical disk device including the groove wobbling data detection device.

[0002]

2. Description of the Related Art As shown in a plan view of FIG. 9A, a sectional view of FIG. 9B for causing an optical spot PS for recording and reproducing data to follow a recording track Tr on an optical disk. 9 is provided, and in the example shown in FIG. 9, the land-groove recording optical disk uses both the groove G and the land L between the grooves G as recording tracks Tr. As shown in FIG. 9A, the address data of the recording / reproducing sector of the optical disk is preformatted by wobbling one side of the groove G, and the preformatted (groove) wobbling data and the land L or the groove G are used. Each recording / reproducing sector can be recognized by the tracking polarity determined by the above.

[0003] Wobbling data is "1" of data.
"0" is recorded by, for example, frequency modulation corresponding to the level of the frequency. The frequency is lower than user data for recording and reproduction, and is separated by filtering. Therefore, the user data can be recorded and reproduced on the recording track of the portion where the wobbling data is pre-formatted, and this is a pre-format method which is advantageous for increasing the capacity of the optical disc. The wobbling data can be detected from the reflected light amount reproduction signal, but can also be detected from the tracking error signal (TES).

[0004] Wobbling data is stored in one of the data zones.
As for the frame, for example, as shown in FIG.
Frame Sync Field having 48 data bits and consisting of a synchronization signal of 4 data bits, Frame Address Field consisting of an address signal of 24 data bits, Reserved Field consisting of a free signal of 6 data bits, and cyclic redundancy check of 14 data bits CRC field consisting of signals
Make up the frame. One data bit is divided into two channel bits (48 × 2 =
96 channel bits / frame).

The wobbling data is frequency-modulated so as to obtain 8.5- and 7.5-wave detection signals, for example, as shown in FIG. 10 (d) for one channel bit "1" and "0". And wobbled, and as shown in (e), is extracted by eight extraction clocks (96 × 8 = 768 clocks / frame) per one channel bit. The extracted wobbling data as shown in (c) is one bit per one channel bit as shown in (b).
Wobbling data reproduction clocks (96 clocks /
Frame).

One frame of the data zone is, for example, as shown in FIG.
As shown in FIG. 1A, the segment is divided into 24 segments. One segment is composed of a Fine Clock Mark Field of 16 data channel bits and a Pre-write Field of 32 data channel bits as shown in FIG. , 864 data channel bits, and a 16-channel pre-write field. One clock mark is provided at the beginning of each segment, and its frequency is determined by the PLL (Phase Locked Loo
16) + 32 + 864 + 1 per segment by p)
A data extraction clock is created by multiplying 6 by 928.

FIG. 14 is a block diagram showing a configuration example of a main part of a conventional groove wobbling data detecting device of an optical disk device. The configuration and operation of this groove wobbling data detection device are based on the tracking error signal (TE
12 (a) is superimposed on the wobbling data signal and the clock mark signal as shown in FIG. 12 (a), and FIG. 12 (b) (FIG. 13 (b ') The wobbling data signal as shown in FIG. 13 is given to the comparison circuit 39 and is binarized (FIG. 13C).

[0008] The binarized signal from the comparison circuit 39 is supplied to a PLL.
The phase difference from the reference cycle (FIG. 13D) is detected (e). In the PLL 54, the phase difference signal (e) detected by the phase comparison circuit 50 is averaged by the low-pass filter 53, and the voltage-controlled oscillator (VCO) 5
2 given. The voltage controlled oscillator 52 oscillates a signal (d) having a frequency corresponding to the applied voltage, and supplies the signal (d) to the phase comparison circuit 50. (E) is detected. Here, since the wobbling data has a DC free pattern, the input voltage from the low-pass filter 53 becomes substantially constant, and the voltage-controlled oscillator 5
2 is locked to the substantially average period of the frequency-modulated wobbling data signal.

The phase difference signal (e) detected by the phase comparison circuit 50 is also supplied to a low-pass filter 41, and a signal (f) filtered (integrated) by the low-pass filter 41.
((F ′) is shown with the cycle reduced) is given to the comparison circuit 42 and binarized (g). 2 by comparison circuit 42
The digitized signal (g) is supplied to the edge detection circuit 55,
The rise is detected, and the detected rise is
The clock is formed by a monostable multivibrator (MSMV) 56 (h).

The clock (h) thus formed is supplied to the PLL 60
DU for latching the binarized signal (g)
The clock becomes TY50% (i). In the PLL 60, the phase difference signal detected by the phase comparison circuit 57 is averaged by the low-pass filter 58, and the voltage-controlled oscillator (V
CO) 59. The voltage controlled oscillator 59 oscillates a signal having a frequency corresponding to the applied voltage (i), and supplies the signal to the phase comparison circuit 57. The phase comparison circuit 57 detects a phase difference from the clock from the monostable multivibrator 56 using the cycle of the given signal as a reference cycle.

The clock output from the PLL 60 is supplied to the reproduction circuit 42c as a wobbling data reproduction clock, and the reproduction circuit 42c uses the wobbling data reproduction clock (i) to convert the binarized signal (g) from the comparison circuit 42 into a signal. , Play the wobbling data.

On the other hand, the tracking error signal (TES) shown in FIG. 12A is also given to the high-pass filter 30 and is filtered by the high-pass filter 30 as shown in FIG.
A clock mark signal as shown in (j) ((j ′) is shown with a reduced period) is applied to an edge detection circuit 31 to detect its zero cross point, and the detected zero cross point is monostable. Multivibrator (MS
MV) 32 to form a clock (FIG. 12)
(K)). The formed clock is supplied to the PLL 36, and its frequency is multiplied by 928 (FIG. 12 (l)).

In the PLL 36, the phase difference signal detected by the phase comparison circuit 33 is averaged by a low-pass filter 34 and supplied to a voltage controlled oscillator (VCO) 35.
The voltage controlled oscillator 35 oscillates a signal having a frequency corresponding to the applied voltage (FIG. 12 (l)) and supplies the signal to the phase comparison circuit 33. The phase comparison circuit 33 detects a phase difference from a clock from the monostable multivibrator 32 using the cycle of the given signal as a reference cycle. The PLL 36 outputs the signal oscillated by the voltage controlled oscillator 35 as a clock whose frequency is multiplied by 928 (FIG. 12 (l)). PLL3
The clock output by 6 is used as a clock for MO data R / W (Read / Write) when the optical disk is a magnetic optical disk.

[0014]

In the conventional groove wobbling data detecting device of the optical disk device as described above, three PLLs are required (two PLLs if the clock relationship for MO data R / W is not included). , The voltage controlled oscillator of the PLL has a large circuit scale and large power consumption.
Further, in the case of LSI, since voltage-controlled oscillators easily interfere with each other, there has been a problem that LSI integration is difficult. The present invention has been made in view of the above circumstances, and has a simple configuration, a low power consumption, a method of detecting groove wobbling data advantageous for LSI integration, a groove wobbling data detection device, and a groove wobbling data detection. It is an object of the present invention to provide an optical disk device provided with the device.

[0015]

According to a first aspect of the present invention, there is provided a method for detecting groove wobbling data, wherein preformat data recorded by wobbling a groove provided for tracking an optical disc by frequency modulation is used as the data. The detection signal of the preformat data is binarized, the capacitor is charged by a constant current source or a constant voltage source for a time corresponding to the width of the binarized detection signal, and the wobbling is performed based on a difference in charged voltage of the charged capacitor. The demodulation is performed by detecting a difference in the period of (i).

In a method for detecting groove wobbling data according to a second aspect of the present invention, the preformat data recorded by wobbling a groove provided for tracking an optical disc by frequency modulation is converted into a detection signal of the preformat data. And counting a clock having a predetermined frequency higher than the wobbling frequency for a time corresponding to the width of the binarized detection signal, and detecting a difference in the wobbling period from a difference in the count value of the clock. , And demodulation is performed.

A groove wobbling data detecting device according to a third aspect of the present invention is a first device for binarizing a detection signal of preformat data recorded by wobbling a groove provided for tracking an optical disk by frequency modulation. A charging circuit for charging a capacitor by a constant current source or a constant voltage source for a time corresponding to the width of the detection signal binarized by the first binarizing circuit; The change in the continuous state of the charging voltage of the capacitor according to the change in the wobbling cycle is represented by 2
And a second binarizing circuit for converting the value into a value.

In the groove wobbling data detection method according to the first invention and the groove wobbling data detection device according to the third invention, the first binarization circuit records the pre-recorded data by wobbling the groove by frequency modulation. Binarize the format data detection signal,
A charging circuit charges the capacitor with a constant current source or a constant voltage source for a time corresponding to the width of the binarized detection signal. Then, the second binarization circuit binarizes a change in the continuous state of the charging voltage of the capacitor charged by the charging circuit in accordance with a change in the wobbling cycle. This eliminates the need for a PLL for detecting the difference in frequency of the frequency-modulated wobbling data signal. Therefore, a method for detecting groove wobbling data which has a simple configuration, consumes low power, and is advantageous for LSI integration, and a groove. A wobbling data detection device can be realized.

An optical disk device according to a fourth aspect of the present invention is a first binary system for binarizing a detection signal of preformat data recorded by wobbling a groove provided for tracking an optical disk by frequency modulation. Circuit, a counting circuit for counting a clock of a predetermined frequency higher than the wobbling frequency for a time corresponding to the width of the detection signal binarized by the first binarization circuit, and the clock counted by the counting circuit. And a third binarizing circuit for binarizing a change in a continuous state of the count values according to a change in the wobbling cycle.

In the groove wobbling data detection method according to the second invention and the groove wobbling data detection device according to the fourth invention, the first binarization circuit records the pre-recorded data by wobbling the groove by frequency modulation. Binarize the format data detection signal,
A counting circuit counts a clock having a predetermined frequency higher than the wobbling frequency for a time corresponding to the width of the binarized detection signal. Then, the third binarization circuit binarizes a change in the continuous state of the count values of the clocks counted by the counter circuit according to a change in the wobbling cycle. This eliminates the need for a PLL for detecting the difference in frequency of the frequency-modulated wobbling data signal. Therefore, a method for detecting groove wobbling data which has a simple configuration, consumes low power, and is advantageous for LSI integration, and a groove. A wobbling data detection device can be realized.

A groove wobbling data detecting device according to a fifth aspect of the present invention is a first device for binarizing a detection signal of preformat data recorded by wobbling a groove provided for tracking an optical disk by frequency modulation. And a clock of a predetermined multiple frequency based on the frequency of a detection signal of a clock mark indicating the beginning of each of a predetermined number of segments provided in each frame provided by dividing the track of the optical disk. And a first frequency divider that divides the clock extracted by the PLL by a predetermined number, and a first binarizing circuit includes two.
A phase comparison circuit for comparing the phase of the valued detection signal with the clock frequency-divided by the first frequency divider and detecting the phase difference; and the wobbling state of the phase difference detected by the phase comparison circuit. Fourth binarizing a change according to a change in period
And a binarizing circuit.

In the groove wobbling data detecting device, the first binarizing circuit binarizes the recorded preformat data detection signal by wobbling the groove by frequency modulation. Also, PLL
However, based on the frequency of the detection signal of the clock mark indicating the start of each segment, a clock of a predetermined multiple frequency is extracted, and the first frequency divider divides this clock by a predetermined number. The phase comparison circuit compares the phase of the detection signal binarized by the first binarization circuit with the clock frequency-divided by the first frequency divider, and detects the phase difference. The fourth binarization circuit binarizes a change in the continuous state of the phase difference according to a change in the wobbling cycle.

Thus, a PLL for detecting a difference in the frequency of the frequency-modulated wobbling data signal is provided.
Is unnecessary, so that a simple configuration and low power consumption of an LSI
A groove wobbling data detection device that is advantageous for integration can be realized.

A groove wobbling data detecting device according to a sixth aspect of the present invention wobbles a groove provided for tracking by frequency modulation, so that a track of an optical disk on which preformat data is recorded is divided and provided. A PLL for extracting a clock having a predetermined multiple frequency based on the frequency of a detection signal of a clock mark indicating the beginning of each segment provided in a predetermined number of segments provided in each frame, and a clock extracted by the PLL is used as the detection signal. A second frequency divider that divides the frequency of the preformat data in synchronization with a predetermined number, and a reproduction circuit that reproduces the preformat data by using a clock divided by the second frequency divider.

In this groove wobbling data detection device, the PLL extracts a clock of a predetermined multiple frequency based on the frequency of the detection signal of the clock mark indicating the head of each segment of the optical disk. The second frequency divider divides this clock by a predetermined fraction in synchronization with the clock mark detection signal, and the reproducing circuit reproduces the preformat data using the clock divided by the second frequency divider. I do. This eliminates the need for a PLL for generating a wobbling data reproduction clock, so that a groove wobbling data detection device with a simple configuration, low power consumption and advantageous for LSI integration can be realized.

A groove wobbling data detecting device according to a seventh aspect of the present invention is a third frequency dividing device which divides the frequency of the clock divided by the first frequency divider by a predetermined number in synchronization with the clock mark detection signal. And a reproducing circuit for reproducing the preformat data from the binarized signal output from the fourth binarizing circuit by a clock frequency-divided by a third frequency divider.

In this groove wobbling data detecting device, the third frequency divider divides the clock divided by the first frequency divider by a predetermined number in synchronization with the clock mark detection signal.
Divided by Then, the reproducing circuit reproduces the preformat data from the binarized signal output from the fourth binarizing circuit by using the clock divided by the third frequency divider. This eliminates the need for a PLL for detecting the difference in frequency of the frequency-modulated wobbling data signal and a PLL for generating a wobbling data reproduction clock. A groove wobbling data detection device that is advantageous for integration can be realized.

According to an eighth aspect of the present invention, there is provided an optical disk apparatus including the groove wobbling data detecting device according to any one of the third to seventh aspects.

This optical disk device includes any one of the groove wobbling data detecting devices according to the third to seventh aspects of the present invention, and includes a PLL and / or a wobbling device for detecting a difference in frequency of the frequency-modulated wobbling data signal. Since a PLL for generating a data reproduction clock is not required, an optical disk device with a simple configuration, low power consumption and advantageous for LSI integration can be realized.

[0030]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings showing the embodiments. Embodiment 1 FIG. FIG. 1 is a block diagram showing a main configuration of an embodiment of a groove wobbling data detection method according to the first invention, a groove wobbling data detection device according to the third invention, and an optical disc device according to the eighth invention.
In this optical disk device, a light beam for reproduction is irradiated on the optical disk D through the half mirror 2 and the objective lens 1. The light beam reflected by the optical disk D passes through the half mirror 2 and is incident on the photodetector 3, where it is converted into an electric signal corresponding to the amount of reflected light received.

The detection signal from the photodetector 3 is input to the preamplifier 4, amplified, and input to the AGC circuit 5.
The AGC (Automatic Gain Control) circuit 5 is a circuit that absorbs fluctuations in the gain of the circuit and fluctuations in the detection signal and keeps the signal amplitude constant. The signal output from the AGC circuit 5 is input to the equivalent circuit 6. The equivalent circuit 6 is a circuit that corrects the amplitude difference due to the frequency of the detection signal, and also removes noise by limiting the frequency band. The signal output from the equivalent circuit 6 is input to a groove wobbling data detection device 7 where it is reproduced and converted into a digital signal.
The converted digital signal is stored in an address conversion table 8
Is converted to a frame address.

FIG. 2 is a block diagram showing a main configuration of the groove wobbling data detecting device 7 of the optical disk device shown in FIG. In the groove wobbling data detection device 7, a (groove) wobbling data signal filtered from a tracking error signal by a band-pass filter (not shown) is provided to a binarization circuit 10. 2
The binarized signal from the digitizing circuit 10 is supplied to an edge detecting circuit 11, and the output of the edge detecting circuit 11 is supplied as an ON signal to a switching circuit 14 via a switching circuit 16 and a delay circuit 12. One terminal of the switch circuit 14 is connected to the constant current source 13 and one terminal of the capacitor C1, and the other terminal is grounded together with the other terminal of the capacitor C1.

One terminal of the capacitor C1 is connected to one terminal of a switch circuit 16 via a buffer 15, and the other terminal of the switch circuit 16 is connected to a capacitor C2 and a buffer 17 the other of which is grounded. ing.
The output of the buffer 17 is provided to a binarizing circuit 18, and the output of the binarizing circuit 18 is provided to a reproducing circuit 18a.

The operation of the groove wobbling data detecting device 7 having such a configuration will be described below with reference to the waveform diagram of FIG. The binarization circuit 10 binarizes the applied wobbling data signal (FIG. 3A) (b), and supplies it to the edge detection circuit 11. The edge detection circuit 11 detects the rising / falling of the applied binary signal and outputs the ON signal (c) to the switch circuit 16.
To the switch circuit 14 via the delay circuit 12 as an ON signal (d).

The constant current source 13 charges the capacitor C1 for a time substantially equal to the period of the ON signal (c) (e), and the binarization circuit 18 operates when the switch circuit 16 is turned on by the ON signal (d). , A voltage signal (f) corresponding to the substantially maximum charging voltage of the capacitor C1 in the cycle of the ON signal (c) is supplied via the buffer 17. The binarization circuit 18 binarizes the applied voltage signal (f) (g) and outputs the binarized signal (f) to the reproduction circuit 1.
8a. Accordingly, the binarization circuit 18 outputs “0” when the cycle of the wobbling data signal is short, for example.
, And “1” can be output when the period of the wobbling data signal is long.

The same effect can be obtained by using a constant voltage source instead of the constant current source 13. In this case, a constant voltage source is provided in place of the constant current source 13, one terminal of a resistor is connected to the constant voltage source, and a switch circuit is connected between the other terminal of the resistor and one terminal of the capacitor C1. It suffices to connect a switch circuit that performs the reverse operation of No. 14. The capacitor C1 is charged by a time constant determined by the resistor and the capacitor C1, and the charging voltage is not proportional to the charging time. By appropriately setting the time constant, it is possible to determine the length of the cycle of the ON signal (c). it can.

Embodiment 2 FIG. 4 is a block diagram showing a main part configuration of a groove wobbling data detection method according to the second invention, a groove wobbling data detection device according to the fourth invention, and an optical disc device according to the eighth invention.
The configuration of the main part of the embodiment of the optical disk apparatus is the same as that of the above-described block diagram of FIG. The groove wobbling data detecting device converts a wobbling data signal obtained by filtering a tracking error signal by a band-pass filter (not shown) into a binarizing circuit 23.
Given to. The binarized signal from the binarization circuit 23 is supplied to an edge detection circuit 24, and the output of the edge detection circuit 24 is supplied to the latch circuit 21 as a latch signal, and the counter is supplied as a start / reset signal via a delay circuit 25 20 given.

A clock higher than the frequency of the groove wobbling data is supplied to the counter 20 for counting.
The counted value is given to the latch circuit 21. The count value latched by the latch circuit 21 is supplied to a binarization circuit 22, and the output of the binarization circuit 22 is supplied to a reproduction circuit 22a.

Hereinafter, the operation of the groove wobbling data detecting device having such a configuration will be described with reference to the waveform diagram of FIG. The binarization circuit 23 binarizes the applied wobbling data signal (FIG. 5A) (b) and supplies it to the edge detection circuit 24. The edge detection circuit 24 detects the rise / fall of the applied binary signal, and its output is provided to the latch circuit 21 as a latch signal (c) and is delayed by the delay circuit 25 (d). The start / reset signal is given to the counter 20.

The counter 20 counts the clock (e) for a time substantially equal to the cycle of the start / reset signal (d) (f). The latch circuit 21 latches the substantially highest count value of the counter 20 in the cycle of the start / reset signal (d) by the latch signal (c), and converts a voltage signal (g) corresponding to the count value into a binarization circuit 22. Give to. The binarization circuit 22 binarizes the applied voltage signal (g) (h) and supplies the binarized voltage signal (g) to the reproduction circuit 22a. Thereby, the binarization circuit 22 can output, for example, “0” when the period of the wobbling data signal is short, and output “1” when the period of the wobbling data signal is long.

Embodiment 3 FIG. 6 is a block diagram showing a main configuration of an embodiment of the groove wobbling data detection device according to the fifth invention and the optical disc device according to the eighth invention. The main configuration of the optical disk device is the same as that shown in FIG.
Since this is the same as the block diagram of FIG. The configuration and operation of this groove wobbling data detection device are such that the tracking error signal (TES) is
As shown in FIG. 12 (j), the clock mark is superimposed on the wobbling data signal and the clock mark signal and is filtered by the high-pass filter 30 as shown in FIG. The signal is applied to the edge detection circuit 31 to detect the zero cross point.

The detected zero cross point is formed into a clock by the monostable multivibrator (MSMV) 32 (FIG. 12 (k)). The formed clock is supplied to the PLL 36. For example, when the frame of the data zone has the configuration shown in FIG.
(FIG. 12 (l)).

In the PLL 36, the phase difference signal detected by the phase comparison circuit 33 is averaged by the low-pass filter 34 and is given to the voltage controlled oscillator (VCO) 35.
The voltage controlled oscillator 35 oscillates a signal having a frequency corresponding to the applied voltage (FIG. 12 (l)) and supplies the signal to the phase comparison circuit 33. The phase comparison circuit 33 detects a phase difference from a clock from the monostable multivibrator 32 using the cycle of the given signal as a reference cycle. The PLL 36 outputs the signal oscillated by the voltage controlled oscillator 35 as a clock whose frequency is multiplied by 928 (FIG. 12 (l)). PLL3
The clock output by 6 is used as a clock for MO data R / W (Read / Write) when the optical disk is a magnetic optical disk.

The clock whose frequency has been multiplied by 928, which is output from the PLL 36, is frequency-divided by, for example, 29 by the frequency divider 37, and is input to the phase comparison circuit 40 as a reference phase clock as shown in FIG. Is done. On the other hand, the tracking error signal (TES) is filtered by the band-pass filter 38, and a wobbling data signal as shown in FIG. 12B (FIG. And binarized (see FIG. 13).
(C)).

The binarized signal from the comparison circuit 39 is input to a phase comparison circuit 40, and a reference phase clock (FIG. 13)
(D)) is detected (FIG. 13 (e)). The phase difference signal detected by the phase comparison circuit 40 (FIG. 13)
(E)) is given to the low-pass filter 41, and the signal (f) filtered (integrated) by the low-pass filter 41
((F ′) is shown with the cycle reduced) is given to the comparison circuit 42 and binarized (FIG. 13 (g)). Comparison circuit 4
The binarized signal (FIG. 13 (g)) obtained by the reproduction circuit 42
The reproduction circuit 42a reproduces the wobbling data from the binarized signal by the comparison circuit 42 in accordance with the wobbling data reproduction clock.

Embodiment 4 FIG. FIG. 7 is a block diagram showing a main configuration of an embodiment of a groove wobbling data detection device according to the sixth invention and an optical disc device according to the eighth invention. The main configuration of the optical disk device is the same as that shown in FIG.
Since this is the same as the block diagram of FIG. The configuration and operation of this groove wobbling data detection device are such that the tracking error signal (TES) is
As shown in FIG. 12, the clock mark signal is superimposed on the wobbling data signal and the clock mark signal and filtered by the high-pass filter 30 as shown in FIG. The signal is applied to the edge detection circuit 31 to detect the zero cross point.

The detected zero cross point is formed on a clock by the monostable multivibrator (MSMV) 32 (FIG. 12 (k)). The formed clock is supplied to the PLL 36. For example, when the frame of the data zone has the configuration shown in FIG.
It is multiplied (FIG. 12 (l)).

In the PLL 36, the phase difference signal detected by the phase comparison circuit 33 is averaged by a low-pass filter 34 and is given to a voltage controlled oscillator (VCO) 35.
The voltage controlled oscillator 35 oscillates a signal having a frequency corresponding to the applied voltage (FIG. 12 (l)) and supplies the signal to the phase comparison circuit 33. The phase comparison circuit 33 detects a phase difference from a clock from the monostable multivibrator 32 using the cycle of the given signal as a reference cycle. The PLL 36 outputs the signal oscillated by the voltage controlled oscillator 35 as a clock whose frequency is multiplied by 928 (FIG. 12 (l)). PLL3
The clock output by 6 is used as a clock for MO data R / W (Read / Write) when the optical disk is a magnetic optical disk.

The clock whose frequency has been multiplied by 928, which is output from the PLL 36, is frequency-divided, for example, by 232 by the frequency divider 45. At this time, the frequency divider 45 is connected to the edge detection circuit 3
1 is input as a reset signal, frequency-divided in synchronization with the zero cross point of the clock mark, and output as a wobbling data reproduction clock. On the other hand, the tracking error signal (TES) is supplied to the wobbling data detection circuit 46, and a binary signal (FIG. 13 (g)) of the wobbling data is extracted.

The binarized signal (FIG. 13 (g)) extracted by the wobbling data detection circuit 46 is supplied to the reproduction circuit 46.
The reproduction circuit 46a reproduces the wobbling data from the binarized signal from the wobbling data detection circuit 46 in accordance with the wobbling data reproduction clock output from the frequency divider 45.

Embodiment 5 FIG. FIG. 8 is a block diagram showing a main configuration of an embodiment of a groove wobbling data detection device according to the seventh invention and an optical disc device according to the eighth invention. The main configuration of the optical disk device is the same as that shown in FIG.
Since this is the same as the block diagram of FIG. The configuration and operation of this groove wobbling data detection device are such that the tracking error signal (TES) is
As shown in FIG. 12 (j), the clock mark is superimposed on the wobbling data signal and the clock mark signal and is filtered by the high-pass filter 30 as shown in FIG. The signal is applied to the edge detection circuit 31 to detect the zero cross point.

The detected zero cross point is formed into a clock by the monostable multivibrator (MSMV) 32 (FIG. 12 (k)). The formed clock is supplied to the PLL 36. For example, when the frame of the data zone has the configuration shown in FIG.
It is multiplied (FIG. 12 (l)).

In the PLL 36, the phase difference signal detected by the phase comparison circuit 33 is averaged by a low-pass filter 34 and is applied to a voltage controlled oscillator (VCO) 35.
The voltage controlled oscillator 35 oscillates a signal having a frequency corresponding to the applied voltage (FIG. 12 (l)) and supplies the signal to the phase comparison circuit 33. The phase comparison circuit 33 detects a phase difference from a clock from the monostable multivibrator 32 using the cycle of the given signal as a reference cycle. The PLL 36 outputs the signal oscillated by the voltage controlled oscillator 35 as a clock whose frequency is multiplied by 928 (FIG. 12 (l)). PLL3
The clock output by 6 is used as a clock for MO data R / W (Read / Write) when the optical disk is a magnetic optical disk.

The clock whose frequency has been multiplied by 928, output from the PLL 36, is frequency-divided by, for example, 29 by the frequency divider 37, and is input to the phase comparison circuit 40 as a clock having a reference phase as shown in FIG. Is done. On the other hand, the tracking error signal (TES) is filtered by the band-pass filter 38, and a wobbling data signal as shown in FIG. 12B (FIG. And binarized (see FIG. 13).
(C)).

The binarized signal from the comparison circuit 39 is input to the phase comparison circuit 40, and a reference phase clock (FIG. 13)
(D)) is detected (FIG. 13 (e)). The phase difference signal detected by the phase comparison circuit 40 (FIG. 13)
(E)) is given to the low-pass filter 41, and the signal (f) filtered (integrated) by the low-pass filter 41
((F ′) is shown with the cycle reduced) is given to the comparison circuit 42 and binarized (FIG. 13 (g)).

On the other hand, the clock frequency-divided by the frequency divider 37 (FIG. 13 (d)) is also supplied to the frequency divider 45a, and is frequency-divided, for example, by eight. At this time, the frequency divider 45a
The output of the edge detection circuit 31 is input as a reset signal, frequency-divided in synchronization with the zero cross point of the clock mark, and a wobbling data reproduction clock (FIG. 13).
Output as (i)). The binarized signal (FIG. 13 (g)) from the comparing circuit 42 is supplied to the reproducing circuit 42b, and the reproducing circuit 42b makes a comparison based on the wobbling data reproduced clock (FIG. 13 (i)) output from the frequency divider 45a. The wobbling data is reproduced from the binarized signal by the circuit 42.

[0057]

According to the groove wobbling data detection method according to the first and second inventions and the groove wobbling data detection device according to the third and fourth inventions, the difference in frequency of the frequency-modulated wobbling data signal is detected. Therefore, a groove wobbling data detection method and a groove wobbling data detection device which have a simple configuration and low power consumption and are advantageous for LSI integration can be realized.

According to the groove wobbling data detecting device of the fifth invention, a PLL for detecting a difference in frequency of the frequency-modulated wobbling data signal is not required. It is possible to realize a groove wobbling data detection device advantageous for LSI integration.

According to the groove wobbling data detecting device of the sixth invention, a PLL for generating a wobbling data reproduction clock is not required, so that the groove wobbling is simple in configuration, consumes low power, and is advantageous for LSI integration. A data detection device can be realized.

According to the groove wobbling data detecting device of the seventh invention, a PLL for detecting a difference in frequency of the frequency modulated wobbling data signal;
PLL for creating a wobbling data recovery clock
Is not required, so that the LS with a simple configuration and low power consumption can be used.
It is possible to realize a groove wobbling data detection device advantageous for I integration.

According to the optical disk device of the eighth invention,
Since a PLL for detecting a frequency difference between the frequency-modulated wobbling data signals and / or a PLL for generating a wobbling data reproduction clock is not required, a simple configuration and low power consumption can be used for LSI integration. An advantageous optical disk device can be realized.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a main configuration of an embodiment of a groove wobbling data detection method, a groove wobbling data detection device, and an optical disc device according to the present invention.

FIG. 2 is a block diagram showing a main configuration of an embodiment of a groove wobbling data detection device according to a third invention.

FIG. 3 is a waveform chart showing an operation of the groove wobbling data detection device shown in FIG.

FIG. 4 is a block diagram showing a main configuration of an embodiment of a groove wobbling data detection device according to a fourth invention.

FIG. 5 is a waveform chart showing an operation of the groove wobbling data detection device shown in FIG.

FIG. 6 is a block diagram showing a main configuration of an embodiment of a groove wobbling data detection device according to the fifth invention.

FIG. 7 is a block diagram showing a main configuration of an embodiment of a groove wobbling data detection device according to the sixth invention.

FIG. 8 is a block diagram showing a main configuration of an embodiment of a groove wobbling data detection device according to the seventh invention.

FIG. 9 is an explanatory diagram for explaining (groove) wobbling data.

FIG. 10 is an explanatory diagram for explaining (groove) wobbling data.

FIG. 11 is an explanatory diagram for explaining a clock mark.

FIG. 12 is a waveform diagram for explaining (groove) wobbling data and clock marks.

FIG. 13 is a waveform chart showing an operation of the groove wobbling data detection device.

FIG. 14 is a block diagram showing a main configuration of a conventional groove wobbling data detection device of an optical disk device.

[Explanation of symbols]

 Reference Signs List 3 photodetector 7 groove wobbling data detector 10, 22, 23 binarization circuit 12 delay circuit 13 constant current source 14, 16 switch circuit 20 counter 21 latch circuit 36 PLL 37, 45, 45a frequency divider 40 phase comparison circuit 42 comparison circuit 42b, 46a reproduction circuit C1 capacitor D optical disk

Claims (8)

[Claims] 1. A preformat data recorded by wobbling a groove provided for tracking of an optical disk by frequency modulation, a detection signal of the preformat data is binarized, and a binarized detection signal is obtained. The capacitor is charged by a constant current source or a constant voltage source according to the width of the capacitor, and demodulation is performed by detecting a difference in the wobbling cycle from a difference in the charged voltage of the charged capacitor. A method for detecting groove wobbling data. 2. A preformat data recorded by wobbling a groove provided for tracking of an optical disc by frequency modulation, a detection signal of the preformat data is binarized, and a binarized detection signal is obtained. Groove wobbling by counting a clock having a predetermined frequency higher than the wobbling frequency for a time corresponding to the width of the wobbling, and detecting a difference in the wobbling cycle from a difference in the count value of the clock to perform demodulation. Data detection method. 3. A first binarizing circuit for binarizing a detection signal of preformat data recorded by wobbling a groove provided for tracking of an optical disk by frequency modulation, and a first binarizing circuit. A charging circuit for charging a capacitor by a constant current source or a constant voltage source for a time corresponding to the width of the detection signal binarized by the binarization circuit, and a continuous state of the charging voltage of the capacitor charged by the charging circuit; The change according to the change of the wobbling cycle is 2
A groove wobbling data detection device, comprising: a second binarization circuit for converting a value into a value. 4. A first binarizing circuit for binarizing a detection signal of preformat data recorded by wobbling a groove provided for tracking an optical disk by frequency modulation, and a first binarizing circuit. A counting circuit for counting a clock having a predetermined frequency higher than the wobbling frequency for a time corresponding to the width of the detection signal binarized by the binarization circuit, and a continuous state of the count value of the clock counted by the counting circuit; And a third binarization circuit for binarizing a change in accordance with a change in the wobbling cycle. 5. A first binarizing circuit for binarizing a detection signal of preformat data recorded by wobbling a groove provided for tracking of an optical disk by frequency modulation, and a track of the optical disk. A PLL for extracting a clock of a predetermined multiple frequency based on the frequency of a detection signal of a clock mark indicating the beginning of each of a predetermined number of segments provided in each of the divided frames, and a clock extracted by the PLL And a first binarizing circuit that divides the frequency by a predetermined number
A phase comparison circuit for comparing the phase of the valued detection signal with the clock frequency-divided by the first frequency divider and detecting the phase difference; and the wobbling state of the phase difference detected by the phase comparison circuit. Fourth binarizing a change according to a change in period
A groove wobbling data detection device, comprising: 6. A predetermined number of grooves provided for tracking are wobbled by frequency modulation in an optical disc on which preformat data is recorded, in each frame provided by dividing a track. A PLL for extracting a clock of a predetermined multiple frequency based on the frequency of a detection signal of a clock mark indicating the start of each segment, and dividing the clock extracted by the PLL into a predetermined number in synchronization with the detection signal. An apparatus for detecting groove wobbling data, comprising: a second frequency divider that circulates; and a reproducing circuit that reproduces the preformat data using a clock divided by the second frequency divider. 7. A third frequency divider for dividing the frequency of the clock divided by the first frequency divider to a predetermined number in synchronization with the detection signal of the clock mark, and a fourth binarizing circuit. 6. The groove wobbling data detecting device according to claim 5, further comprising: a reproducing circuit that reproduces the preformat data from the binarized signal output by the third frequency divider using a clock divided by a third frequency divider. 8. An optical disk device comprising the groove wobbling data detecting device according to claim 3.