KR100459704B1 - Apparatus and method for compensating phase difference between phase reference and wobble signal on optical storage medium - Google Patents

Abstract

The present invention relates to an apparatus and method for compensating a phase difference between a phase reference signal and a wobble signal on an optical recording medium, wherein the apparatus for recording and reproducing an optical recording medium detects a phase difference between a phase reference signal and a groove wobble signal on an optical recording medium. Detection unit; And a phase difference correction unit for compensating a phase by the detected phase difference from the groove wobble signal and outputting a result thereof.

According to the present invention, data is recorded on an optical recording medium by detecting and compensating for a phase difference between a phase reference signal and a wobble on the optical recording medium. Control can be performed more correctly.

Description

Apparatus and method for compensating phase difference between phase reference and wobble signal on optical storage medium}

The present invention relates to recording control of an optical recording medium, and more particularly, to a phase difference detection between a wobble phase reference signal and a wobble signal of an optical recording medium and a method for controlling phase difference correction accordingly.

An optical recording medium such as a DVD-R or a DVD-RW includes a LPP (Land Pre-Pit) in which pits containing address information are inscribed on a land during fabrication of a disc substrate. The LPP signal is derived when the light beam follows the tracks of the optical record carrier and is measured by optical pickup of the recording device before and after recording.

Groove wobble signals are also derived when the light beam follows the track and are measured by optical pickup of the recording device before and after recording.

When the groove wobble signal is called a sine wave signal, the groove wobble and the LPP signal on the disk It is formed to have a phase difference of. The phase difference between the wobble signal and the LPP signal is measured between the highest point of the LPP signal and the average zero crossing point of the wobble. This phase difference must be kept constant so that the LPP can be correctly decoded and data recorded at the correct point on the optical record carrier.

Optical recording media such as DVD + R and DVD + RW have written address information on the disc using wobble phase information. The wobble phase error caused by the characteristics of the detection filter itself compared to the phase reference signal (land-pre-pit (LPP) signal in case of DVD-R and DVD-RW) during wobble detection may cause data to be recorded at an accurate point on the optical recording medium. It should be calibrated so that

It is an object of the present invention to provide an apparatus and method for correcting a phase difference between a phase reference signal and a wobble signal detected on an optical recording medium so that correct data recording and reproduction can be performed on the optical recording medium.

1 is a schematic block diagram of an optical recording medium recording and reproducing apparatus.

2 is a schematic block diagram of a phase difference compensation device of a phase reference signal and a groove wobble signal according to the present invention.

3 is a detailed view of the wobble PLL unit of FIG. 2.

4 is a detailed block diagram of the phase difference correction unit of FIG. 2.

5 is a timing diagram of signals output from the elements of FIG. 4.

In order to solve the above problems, an optical recording medium recording and reproducing apparatus includes a phase difference detecting unit detecting a phase difference between a phase reference signal and a groove wobble signal on the optical recording medium; And a phase difference correction unit compensating a phase by the detected phase difference from the groove wobble signal and outputting a result thereof.

The phase difference corrector phase-locks the groove wobble signal. A wobble period counter for counting a period of a phase locked wobble signal; A correction amount setting unit for setting a correction amount to correct by the phase difference detected by the phase difference detection unit; A correction reset generator for generating a reset signal when a correction value set in the correction amount setting unit coincides with a counter value of the wobble period counter; A correction counter for starting a new count from the time when the reset signal is generated; And a correction wobble signal generator for generating a correction wobble signal by outputting "1" if the counter value of the correction counter is less than a specific value and "0" if the counter value is greater than or equal to the specific value.

In the generation of the corrected wobble signal, in the case of the DVD-R or the DVD-RW, it is preferable that the period of the wobble corresponds to 186 clocks and set to 93 as a specific value to make the duty of the corrected wobble 50%.

In the case of a DVD-R or a DVD-RW, the phase reference signal may be a land pre-pit (LPP) signal.

In order to solve the above problems, an apparatus for compensating the phase difference between a phase reference signal and a groove wobble on an optical recording medium may count a period of a phase locked wobble signal in which the groove wobble signal is phase-locked. A wobble period counter; A correction amount setting unit for setting a correction amount to correct by the phase difference detected by the phase difference detection unit; A correction reset generator for generating a reset signal when a correction value set in the correction amount setting unit coincides with a counter value of the wobble period counter; A correction counter for starting a new count from the time when the reset signal is generated; And a correction wobble signal generator for generating a correction wobble signal from the correction counter.

The wobble period counter preferably counts the wobble signal in units of a wobble clock signal oscillating by n times the groove wobble signal.

In the case of a DVD-R or a DVD-RW, the phase reference signal may be a land pre-pit (LPP) signal.

To solve the above problems, an optical recording medium recording and reproducing method includes: detecting a phase difference between a phase reference signal and a wobble signal on the optical recording medium; And generating a wobble signal compensated for the detected phase difference.

The generating of the wobble signal having the phase difference compensated may include: counting a period of the wobble signal in which the groove wobble signal is phase-locked; Setting a correction amount to correct by the phase difference detected by the phase difference detection unit; The correction value set in the correction amount setting unit and the counter value of the wobble period counter coincide to correct the phase difference. Generating a reset signal at a time point; Starting a new count from the time when the reset signal is generated; And generating a wobble signal having a phase difference corrected at the time when the correction counter starts.

In the case of a DVD-R or a DVD-RW, the phase reference signal may be a land pre-pit (LPP) signal.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic block diagram of an optical recording medium recording and reproducing apparatus.

The optical recording medium recording and reproducing apparatus of FIG. 1 includes a pick-up unit 100, an adaptive laser power controller (ALPC) 101, a high frequency amplifier (RF-AMP) 102, The data processor 103 includes a host interface 104, a servo controller 105, and a motor & drive 106.

The pickup unit 100 reads out a signal recorded on the optical recording medium 10.

The adaptive laser power control unit 101 receives a write pulse signal, a write clock signal, and a write enable signal from the data processor 103 to control the laser light amount for recording. Accordingly, the recording pulse signal can be recorded on the optical recording medium 10 in the form of a recording mark through the pickup unit 100 in accordance with the write clock signal.

The high frequency amplifier 102 amplifies the minute electrical signal output from the pickup unit 100. The reproduction signal and the wobble signal are detected from the amplified electrical signal and provided to the data processor 103.

The data processor 103 performs synchronization signal detection, insertion and protection from the reproduction signal provided from the high frequency amplifier 102 at the time of reproduction, and performs demodulation and error detection / correction. In addition, various control signals of the high frequency amplifier 102 are generated and the signals related to the servo are provided to the servo controller 105. The data processor 103 performs modulation, error correction encoding, and the like on the data provided from the host 11 through the host interface unit 104 during recording, and generates a recording pulse signal according to the adaptive laser power control unit 101. To provide. In the context of the present invention, the data processor 103 includes circuitry for detecting and compensating for the phase difference between the wobble signal and the phase reference signal (e.g., LPP signal in DVD-R, DVD-RW). This will be described in detail below with reference to FIG. 2.

The host interface 104 is responsible for the interface between the data processor 103 and the host 11 of the optical recording / reproducing apparatus.

The servo controller 105 receives a signal related to a servo provided from the data processor 103 and is in charge of servo control, tracking, and cursor related to rotation speed control of the optical recording medium 10.

The motor driver 106 includes a motor associated with the rotation of the disk 10 and a drive thereof, and includes a motor drive signal provided by the servo controller 105, and a servo drive signal for tracking servo or focusing servo. Control the motor and its drive accordingly.

The optical recording medium recording and reproducing apparatus may further include a microcomputer 107 which collectively controls each of the above-described components and the signal flow therebetween.

2 is a schematic block diagram of a phase difference compensation device of a phase reference signal and a groove wobble signal according to the present invention.

The phase difference compensation device of the phase reference signal and groove wobble signal (hereinafter, referred to as wobble signal) of FIG. 2 includes a wobble PLL unit 200, a phase difference detection unit 210, a phase difference correction unit 220, and an address. The decoder 230 and the microcomputer 107 are included.

The wobble PLL unit 200 is a wobble clock signal wbclk, which is a result of a phase locked loop circuit having a wobble signal as an input signal, and a wobble signal, which is a phase-locked signal that follows the input wobble signal and follows average jitter. outputs (pwb; PLL wobble) In DVD-R / RW, the wobble is 186 times the wobble clock, and in DVD + R / RW the wobble is 32 times the wobble clock. 3 is a detailed configuration diagram of the wobble PLL unit 200. In FIG. 3, the wobble PLL unit 200 compares the wobble signal with pwb, which is an n-division signal of the phase-synchronized wobble clock wbclk signal, and outputs the phase difference. Wobble output from the low pass filter (LPF) 202, the voltage controlled oscillator (VCO) 203 for outputting the clock oscillation signal corresponding to the voltage from the low pass filter 202, and the voltage controlled oscillator 203 And n divider 204 for dividing the clock wbclk to generate the wobble signal pwb. The wobble signal pwb has a natural frequency and a phase of the original wobble signal. Since the wobble is a stable signal with improved defects and jitter than the wobble detected directly by the RF amplifier, the wobble is used to detect the phase difference from the phase reference signal using the wobble rather than the wobble signal.

The phase difference detector 210 of FIG. 2 detects a phase difference between the phase reference signal and the wobble signal by applying a predetermined method. In the case of DVD-R and DVD-RW, the LPP signal can be used as the phase reference signal. The phase difference detector 210 may detect the phase difference in units of wobble clocks (wbclk). The detected phase difference signal may be input to the microcomputer 107 or the like, or may be directly input to the phase difference corrector 220. When the phase difference signal is input to the microcomputer 107, the microcomputer 107 calculates a phase difference compensation value using the phase difference signal and provides the phase difference compensation unit 220 to the phase difference correction unit 220.

The phase difference corrector 220 compensates the phase of the wobble signal by a value corresponding to an input value from the microcomputer 107 or the phase difference detector 210. When the phase difference detection signal counts the wobble clock signal wbclk as a unit, the phase difference signal will be a value within a value of counting one wobble period. For example, suppose that a signal of 1 pibble (or wobble) period is composed of 186 wobble clock signals (1 cycle count value: 0 to 185), the phase difference between the wobble signal and the predetermined phase reference signal will not exceed the count value 185. . If the detected phase difference is 93 wobble clocks and the phase difference needs to be compensated for, the phase difference correction unit 220 may delay the phase of the subsequent wobble signal by 93 wobble clocks. Detailed circuit diagrams and descriptions of the phase difference correction unit 220 will be described below.

The address decoding unit 230 decodes the address signal according to the corrected wobble signal output from the phase difference correction unit 220 and outputs various types of information such as an ECC block address.

4 illustrates a detailed circuit diagram of the phase difference correction unit 220 of FIG. 2.

In FIG. 4, the detailed circuit of the phase difference correction unit 220 includes a wobble period counter 400, a correction reset generator 410, a correction counter 420, a correction wobble signal generator 430, and a correction amount setting unit 440. Include.

The wobble period counter 400 counts a period of the wobble signal pwb using a wobble clock wbclk signal.

The correction reset generator 410 generates a reset signal according to the phase difference correction value provided by the microcomputer 107 or the phase difference detector 210 of FIG. 2. For example, if the phase difference correction value is '24', a reset signal is generated when the 24th wobble clock is input from the start of the wobble period.

The correction counter 420 starts counting anew from the time when the reset signal generated by the correction reset generator 410 is input.

The correction wobble signal generation unit 430 generates a wobble signal starting a new cycle from the time when the correction counter 420 starts a new count.

5 is a timing diagram of signals output from the elements of FIG. 4.

First, FIG. 5A illustrates a signal pwb input to the powerable period counter 400.

(b) is a signal generated when detecting a rising edge of the power signal. This is a signal for counting the wobble period, and each time this signal occurs, the count starts a new wobble unit.

(c) is a signal in which (a) of one cycle is enlarged and shown in accordance with the signal of (b).

(d) is an output value of the wobble period counter 400 which counts the period of the wobble signal in (c) in accordance with the wobble clock.

(e) in the correction amount setting unit 440. This is a correction reset signal which is an output value of the correction reset generator 410 in the example where the phase difference correction value is input to 93. The correction reset signal is generated when the 93th wobble clock is input from the start of the wobble.

(f) is an output value of the correction counter 420, and counting starts anew according to the wobble clock after the correction reset signal of (e) occurs.

(g) is the output of the corrected wobble signal output from the corrected wobble signal generator 430. The wobble signal is corrected to start the cycle from the time when the correction reset signal of (e) is generated and the count is newly started.

By providing an apparatus and a method for compensating the phase difference between the phase reference signal and the groove wobble signal as described above, it is possible to correctly decode the address information, and to perform recording by finding a more accurate position in recording the optical recording medium. You can do it.

According to the present invention, data is recorded on an optical recording medium by detecting and compensating for a phase difference between a phase reference signal and a wobble on the optical recording medium. Control can be performed more correctly.

Claims (10)

A phase difference detector for detecting a phase difference between the phase reference signal and the groove wobble signal on the optical recording medium; Phase-synchronized the groove wobble signal A wobble period counter for counting a period of a phase locked wobble signal; A correction amount setting unit for setting a correction amount to correct by the phase difference detected by the phase difference detection unit; A correction reset generator for generating a reset signal when a correction value set in the correction amount setting unit coincides with a counter value of the wobble period counter; A correction counter for starting a new count from the time when the reset signal is generated; And And a correction wobble signal generation unit for generating a correction wobble signal by outputting "1" if the counter value of the correction counter is less than a specific value and "0" if the counter value is greater than or equal to a specific value. . delete The method of claim 1, wherein the correction wobble signal generation unit of the correction wobble signal generation unit, In the case of a DVD-R or a DVD-RW, an optical recording medium recording and reproducing apparatus characterized in that the period of the wobble corresponds to 186 clocks and is set to 93 as a specific value to make the duty of the corrected wobble 50%. And the phase reference signal is a land pre-pit (LPP) signal in the case of a DVD-R or a DVD-RW. An apparatus for compensating for a phase difference between a phase reference signal and a groove wobble on an optical recording medium, A wobble period counter for counting a period of a phase locked wobble signal in which the groove wobble signal is phase-locked; A correction amount setting unit for setting a correction amount to correct by the phase difference detected by the phase difference detection unit; A correction reset generator for generating a reset signal when a correction value set in the correction amount setting unit coincides with a counter value of the wobble period counter; A correction counter for starting a new count from the time when the reset signal is generated; And a correction wobble signal generator for generating a correction wobble signal from the correction counter. The method of claim 5, wherein the wobble period counter, The wobble phase difference compensator on the optical recording medium, characterized in that for counting the wobble signal in units of a wobble clock signal oscillating by n times the groove wobble signal. The apparatus of claim 5, wherein the phase reference signal is a Land Pre-Pit (LPP) signal in the case of a DVD-R or a DVD-RW. In the optical recording medium recording and reproducing method, Detecting a phase difference between a phase reference signal and a wobble signal on the optical recording medium; And And generating a wobble signal with the detected phase difference compensated for. The method of claim 8, wherein the generating of the wobble signal having the phase difference compensated for comprises: Counting a period of the wobble signal in which the groove wobble signal is phase-locked; Setting a correction amount to correct by the phase difference detected by the phase difference detection unit; Starting a new count from a time when a signal in which the correction value set in the correction amount setting unit and the counter value of the wobble period counter coincide to generate the phase difference is generated; And And generating a wobble signal having a phase difference corrected at the time when the correction counter starts. The method of claim 8, wherein the phase reference signal is a Land Pre-Pit (LPP) signal in the case of a DVD-R or a DVD-RW.