JP2009170004A - Optical disk device and method for controlling the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To generate a clock phase-synchronized with a clock generated from a reproducing RF signal using a wobble signal without enlarging a circuit. <P>SOLUTION: An RF signal for obtaining reproduced data by using a reflected light of an optical beam, and original data is obtained from the RF signal. A clock phase-synchronized with the reproducing RF signal is generated to detect data by using the clock. Thus, the data is detected by use this clock, so that address information is obtained before reproduced data is detected without using a PLL circuit for generating a clock using the reproducing RF signal. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an optical disk device and a method for controlling the optical disk device, and more particularly to a technique suitable for use in an apparatus for reproducing data by irradiating an optical disk with a light beam.

  2. Description of the Related Art Conventionally, an apparatus for recording and reproducing video and audio data on an optical disc such as a DVD (Digital-Video-Disc) or a Blu-ray optical disc (BD) is known. For example, in the BD, a spiral guide groove is provided in advance from the inner periphery to the outer periphery of the optical disk plane or from the outer periphery to the inner periphery at the manufacturing stage.

  The guide groove basically has a small undulation (oscillates) with a predetermined amplitude and a single meandering cycle, and this is called a wobble. Thus, data writing and reading are realized by irradiating the wobble formed on the optical disc with the light beam.

  In addition, a reference frequency signal is generated from reflected light when the light beam is irradiated on the wobble, and this is used as a clock for recording / reproduction, so that the reference frequency signal used for recording is generated with high accuracy. In BD, a wobble signal subjected to a specific modulation is embedded in a continuous wobble having a single frequency. As a result, timing information and physical position information on the optical disk (physical address information, hereinafter referred to as ADIP address) can be detected from the optical disk.

  Further, at the time of reproduction, an RF signal for obtaining reproduction data is generated using reflected light of the light beam, and the original data is obtained from this RF signal. At this time, a clock phase-synchronized with the reproduction RF signal is generated, and data is detected using this clock.

  On the other hand, at the time of recording, since no data is recorded on the optical disc, a clock cannot be generated using the reproduced RF signal. For this reason, a clock is generated using the wobble signal and data is recorded.

  In a recording optical disk apparatus that records and reproduces data on such an optical disk, the pickup may be moved to a position different from the current reproduction position during reproduction, and data may be newly reproduced at the movement destination. For example, if a skip instruction is given during playback of a certain video, the pickup must be moved to the recording position of the skip destination data.

  In such a case, an address on the optical disk is included in the data obtained from the reproduction RF signal at the destination, but as described above, the reproduction data can be detected by acquiring the clock at the destination. Until then, address information cannot be acquired.

  Therefore, it is effective to be able to detect address information using a wobble signal even during reproduction. In order to realize this, it is necessary to configure so that the clock can be acquired from the wobble signal even during reproduction. For example, Patent Document 1 proposes an apparatus including both a PLL circuit for generating a clock using a reproduced RF signal and a PLL circuit for generating a clock using a wobble signal.

JP 2002-298367 A

  The optical disc drive apparatus described in Patent Document 1 must include a PLL circuit for a reproduction RF signal and a PLL circuit for a wobble signal. Also, a circuit that avoids disturbance elements due to wobble is necessary. Therefore, when the address information is detected using the wobble signal, there is a problem that the circuit area and power consumption increase.

  In view of the above-described problems, an object of the present invention is to generate a clock that is phase-synchronized with a clock generated from a reproduction RF signal by using a wobble signal.

The optical disc device of the present invention is an optical disc device that reproduces data from an optical disc on which a meandering track is formed with a predetermined period, and generates a reproduction RF signal from the reflected light of the light beam reflected by the optical disc, Generating means for generating a wobble signal having a frequency related to the meandering cycle of the track; reproducing clock generating means for generating a recovered clock from the recovered RF signal; and generating an internal carrier signal for generating an internal carrier signal from the recovered clock And a phase synchronization means for synchronizing the phases of the internal carrier signal and the wobble signal, and a detection carrier signal for detecting address information of the optical disc is generated based on an output signal of the phase synchronization means And a carrier signal generation means for detection.
Another feature of the optical disk apparatus according to the present invention is an optical disk apparatus for reproducing data from an optical disk on which a meandering track is formed at a predetermined cycle, and a light beam is applied to the track formed on the optical disk. A reproduction RF signal generation unit that generates a reproduction RF signal using reflected light of the light beam irradiated from the light beam irradiation unit and reflected by the optical disc, and the reproduction RF signal generation A clock generating means for generating a first clock phase-synchronized with the RF signal generated by the means, and a wobble signal for generating a wobble signal having a frequency related to the meandering period of the track using the reflected light of the light beam. Generating means, counting the first clock, and a second clock having a frequency corresponding to the frequency of the wobble signal; Detecting the phase difference between the wobble signal and the second clock, and based on the phase difference, the phase of the first clock and the second clock is synchronized with each other. Phase shift means for shifting a value; Address information detection means for detecting address information of the optical disk using the wobble signal and the second clock.

The method for controlling an optical disk apparatus according to the present invention is a method for controlling an optical disk apparatus for reproducing data from an optical disk on which tracks meandering with a predetermined period, and reproduces RF from the reflected light of the light beam reflected by the optical disk. Generating a signal, generating a wobble signal having a frequency related to the meandering cycle of the track, generating a reproduction clock from the reproduction RF signal, and generating an internal carrier signal from the reproduction clock. An internal carrier signal generation step to be generated, a phase synchronization step for synchronizing the phases of the internal carrier signal and the wobble signal, and detection for detecting address information of the optical disc based on an output signal of the phase synchronization step And a carrier signal generation step for detection for generating a carrier signal for operation. And butterflies.
Another feature of the control method of the optical disk apparatus according to the present invention is a control method of the optical disk apparatus for reproducing data from an optical disk on which a meandering track is formed at a predetermined cycle, which is formed on the optical disk. A light beam irradiating step for irradiating a light beam to the track, and a reproduction RF signal generating step for generating a reproduction RF signal using the reflected light of the light beam irradiated in the light beam irradiation step and reflected by the optical disc; A clock generation step of generating a first clock phase-synchronized with the RF signal generated in the reproduction RF signal generation step, and a wobble having a frequency related to the meandering cycle of the track using the reflected light of the light beam A wobble signal generating step for generating a signal, and counting the first clock to match the frequency of the wobble signal. A step of generating a second clock having the frequency determined, and detecting a phase difference between the wobble signal and the second clock, and based on the phase difference, the phases of the first clock and the second clock are determined. A phase shift step of shifting the value of the counting step so as to synchronize; and an address information detection step of detecting address information of the optical disc using the wobble signal and the second clock.

The program of the present invention is a program for causing a computer to execute a process of controlling an optical disc apparatus that reproduces data from an optical disc on which a meandering track is formed with a predetermined cycle, and the reflected light of the light beam reflected by the optical disc. Generating a reproduction RF signal from the reproduction RF signal and generating a wobble signal having a frequency related to the meandering period of the track, a reproduction clock generation step for generating a reproduction clock from the reproduction RF signal, and an internal process from the reproduction clock. An address information of the optical disc is detected based on an internal carrier signal generation step for generating a carrier signal, a phase synchronization step for synchronizing the phases of the internal carrier signal and the wobble signal, and an output signal of the phase synchronization step. Detection carrier signal for generating detection carrier signal for Characterized in that to execute the generation process in the computer.
Another feature of the program of the present invention is a program for causing a computer to execute a process of controlling an optical disk device that reproduces data from an optical disk on which tracks meandering with a predetermined period are formed. A light beam irradiation step of irradiating a light beam to the track formed above, and a reproduction RF signal that generates a reproduction RF signal using reflected light of the light beam irradiated in the light beam irradiation step and reflected by the optical disc A generation step, a clock generation step of generating a first clock phase-synchronized with the RF signal generated in the reproduction RF signal generation step, and a frequency related to the meandering cycle of the track using the reflected light of the light beam A wobble signal generating step for generating a wobble signal having a count of the first clock, A counting step for generating a second clock having a frequency corresponding to the frequency of the wobble signal, a phase difference between the wobble signal and the second clock is detected, and the first clock and the second clock are detected based on the phase difference. A phase shift step of shifting the value of the counting step so that the phases of the two clocks are synchronized, and an address information detection step of detecting the address information of the optical disc using the wobble signal and the second clock It is made to perform.

According to the present invention, the reproduction clock for detecting the physical position information is generated using the reproduction RF signal, so that the reproduction clock is generated using the clock from the wobble PLL. The disturbance element due to wobble can be eliminated. Further, since it is possible to acquire a recovered clock by providing only one VCO, it is possible to reduce and simplify the circuit area and power consumption.
Further, according to another feature of the present invention, the phase synchronization between the wobble signal necessary for detecting the ADIP address and the internal carrier signal can be achieved during reproduction, so that address reading is performed during operation in the reproduction mode. be able to.

(First embodiment)
Next, an embodiment of the optical disk device of the present invention will be described with reference to the drawings.
FIG. 2 is a block diagram showing a configuration example of main functions necessary for explaining the ADIP address detection method during the recording operation.
As shown in FIG. 2, the laser light emitted from the light generating device 202 disposed in the optical pickup 204 is reflected by the optical disc 201. Then, the reflected light from the optical disc 201 is detected by the light detection device 203 provided in the optical pickup 204.

  The light detection device 203 is configured using a photoelectric conversion element that outputs a current amount corresponding to the amount of received light, and outputs a current corresponding to the intensity of the input reflected light. The signal subjected to current conversion by the photodetector 203 is subjected to current-voltage conversion by an I / V amplifier (not shown) and output from the optical pickup 204. By performing appropriate signal processing on the output signal, an RF signal, a focus error signal, a tracking error signal, and a wobble signal are generated.

  In the example of FIG. 2, the output signal of the optical pickup 204 is input to the wobble detection circuit 205, and appropriate signal processing is performed on the output signal in the wobble detection circuit 205 to output it as a wobble signal.

  The wobble signal output from the wobble detection circuit 205 is gain-adjusted by the level adjustment unit 206, and then appropriate band limitation is performed by a low-pass filter (LPF) 207. Thereafter, the digital signal is converted into a digital signal by an analog-digital converter (A / D converter) 208, a DC component is removed by a high-pass filter (HPF) 209, and then supplied to the PLL circuit 210.

  The PLL circuit 210 includes a phase generation unit 211, a loop filter 214, a VCO (voltage controlled oscillator) 215, a carrier generation counter (0-N counter) 216 that counts up by a clock output from the VCO 215, and a carrier generation table 217. . The carrier generation table 217 outputs a specific value to the phase comparison unit 211 based on the counter value of the carrier generation counter 216.

  The phase comparison unit 211 in the PLL circuit 210 compares the phases of the internally generated carrier 218 generated from the carrier generation table 217 and the input wobble signal. The phase comparator 211 includes a multiplier 212 and a low pass filter (LPF) 213. For example, if the input wobble signal is modeled by the cosine wave COS (ωt) and the sine wave SIN (ωt + Φ) is used as an internally generated carrier, it is orthogonal to the input wobble signal of “Φ = 0” during normal operation of the PLL. An internal carrier is always generated.

Next, a flow of a method for detecting an ADIP address will be described with reference to FIG.
First, as a method of embedding a signal in the wobble formed on the optical disc 201, there is a method called MSK (Minimum Shift Keying) signal, for example, as shown in FIG. This is a method of locally embedding a signal having the same frequency as the wobble signal shown in FIG.

  Further, as shown in FIGS. 4E and 4H, the frequency is twice that of the wobble signal. A method called HMW (High Frequency Modulated grooves (STW: Saw Tooth Wobble)) that adds and subtracts signals whose phases are shifted by 90 degrees is known.

When the basic wobble signal shown in FIG. 4A is modeled by COS (ωt), the MSK signal and the HMW (STW) signal are mathematically
Wobble: COS (ωt)
MSK: COS (ωt + π)
HMW: COS (ωt) ± a × SIN (2ωt)
It is indicated.

As a method for detecting the MSK signal and the HMW (STW) signal embedded in the wobble, for example, a method using heterodyne detection is conceivable.
In heterodyne detection of MSK detection, a carrier signal COS (ωt) whose frequency and phase are synchronized with respect to a wobble basic signal (basic wobble shown in FIG. 4A) modeled by COS (ωt). Generate. Then, the signal shown in FIG. 4E can be obtained by multiplying the MSK signal and applying appropriate low-pass filter processing (LPF). The MSK signal is detected by binarizing this signal, for example, with a certain threshold value or performing peak detection.

  In heterodyne detection of HMW (STW) detection, a carrier signal SIN (2ωt) (FIG. 4 (g) whose phase is synchronized with a frequency twice that of the wobble basic signal (FIG. 4 (a)) modeled by COS (ωt). )) Is generated internally. Then, by multiplying the HMW (STW) signal and applying appropriate low-pass filter processing (LPF), the signal shown in FIG. 4 (i) can be obtained.

  In HMW (STW), it is detected as shown in FIG. 4 (i) and FIG. 4 (m) depending on whether a signal shifted 90 degrees in phase at a double frequency is added to or subtracted from the basic wobble signal. The signal polarity is different. This difference in polarity is used to distinguish between data “0” and data “1”.

  In this way, the carrier generation table 217 generates a wobble carrier signal (second clock signal) having the frequency of the wobble signal. And it supplies to the COS wave generation part 220 and the double frequency SIN wave generator 225, respectively, and produces | generates the signal of the frequency according to the said MSK signal and HMW signal.

  These signals are multiplied by wobble signals by multipliers 221 and 226, respectively, and heterodyne detection is performed. The results are sent to multipliers 223 and 228 via LPFs 222 and 227, respectively.

  The integration results of the integrators 223 and 228 are read at the timing designated by the timing generator 219, sampled by the sample hold units (S / H units) 224 and 229, and sent to the address detection unit 230. The address detection unit 230 determines “1” and “0” of the data based on the outputs from the sample hold units 224 and 229, and performs address information detection.

Next, the ADIP address reproduction at the time of reproduction, which is a problem of the present embodiment, will be described.
FIG. 1 shows a main configuration used at the time of reproduction in the optical disc apparatus of the present embodiment.
First, the operation of the VCO (voltage controlled oscillator) 112 during reproduction based on the RF signal will be described. In FIG. 1 to FIG. 3, blocks having the same name are the same block even if the reference numerals attached to the blocks are different. For example, the VCO 112 shown in FIG. 1 is the same as the VCO 215 shown in FIG.

  As in recording, light beam irradiation is performed from the light generator 102 provided in the optical pickup 104. The laser beam emitted from the light generator 102 is reflected by the optical disc 101. Then, the reflected light from the optical disc 101 is detected by the light detection device 103 in the optical pickup 104. In the present embodiment, a track meandering at a predetermined cycle is formed on the optical disc 101.

  The photodetector 103 includes a photoelectric conversion element that outputs a current amount corresponding to the amount of received light, an I / V amplifier that performs current-voltage conversion, and the like. By performing appropriate signal processing on the output signal of the light detection device 103, an RF signal, a focus error signal, a tracking error signal, and a wobble signal are generated.

  In FIG. 1, an RF signal is detected by an RF detection circuit 105 with respect to a signal output from the light detection device 103. The RF signal detected by the RF detection circuit 105 is gain-adjusted by the level adjustment unit 106. Thereafter, the band is appropriately limited by a low-pass filter (LPF) 107, converted to a digital signal by an analog-digital converter (A / D converter) 108, and the waveform is adjusted by a waveform equalizer 109. Thereafter, it is output to an RF-PLL (reproduction PLL circuit) formed by the phase comparison unit 110, the loop filter 111, and the VCO 112, and a reproduction clock is generated (first clock generation). Based on the reproduction clock generated in this way, the carrier generation counter (0-N counter) 125 is operated in the same manner as at the time of recording.

  In FIG. 1, 113 is a data determination unit, 114 is a demodulation unit, and 115 is an EOC (End Of Code) code indicating the end of code. Also, 116 is a wobble detection circuit, 117 is a level adjusting unit, 118 is a low pass filter (LPF), 119 is an A / D converter, and 120 is a high pass filter (HPF). 121 is a binarization circuit that generates a binary signal by comparing a wobble signal with a predetermined threshold, 122 is an edge detection unit, 123 is a phase detection unit, 124 is a phase shift circuit, and 125 is a count from 0 to N. It is a carrier generation counter. Reference numeral 126 denotes a carrier generation table for generating a carrier signal for detection, and generates a carrier signal 127 for detecting MSK and HMW (STW). Reference numeral 128 denotes an address detection unit.

  The waveform shown in FIG. 5A is a recovered clock. The carrier generation counter 125 is operated by this reproduction clock, and the counter signal shown in FIG. 5B is output. Then, the counter value is input to the carrier generation table 126, and the carrier shown in FIG. At this time, the carrier in FIG. 5C and the input wobble signal shown in FIG. 5D have the same frequency, but there is no compensation that the phases are synchronized. For example, the phase may be shifted as shown in the relationship between FIG. 5C and FIG.

  In the present embodiment, in order to synchronize the phase of the carrier and the input wobble signal, the binarization circuit 121 binarizes the input wobble signal shown in FIG. 5D by comparing it with a predetermined threshold value. The signal shown in FIG. 5 (e) is generated. Then, the carrier generation counter 125 is reset at the rising edge signal shown in FIG. As a result, the carrier generation counter 125 resets the count value at every rising edge of the input wobble signal as shown in FIG. By this operation, the carrier diagram 5 (h) synchronized with the input wobble signal of FIG. 5 (d) is generated.

  In the present embodiment, the phase of the input wobble signal and the carrier is phase-synchronized by resetting the carrier generation counter 125, and then the phase lock is detected based on the internal counter of FIG. That is, an edge detection window that opens a window during a clock period that is a specific timing of the internal counter in FIG. Then, it is monitored whether or not the wobble rising signal (f) can be detected in the edge detection window. When the phase lock state is detected in the phase lock detector, the counter reset operation described above is not performed.

  On the other hand, when a reproduction signal defect temporarily occurs due to scratches or dust on the optical disk 101, the operation of the reproduction PLL circuit may be disturbed, resulting in a disturbance of the reproduction clock. When the phase of the input wobble signal and the internally generated carrier is greatly shifted, the phase lock detecting unit detects the phase unlocked state. Then, the counter reset operation based on the rising edge of the input wobble signal is performed again.

  The case described above is a case where the recovered clock is greatly disturbed temporarily and the phase between the input wobble signal and the internally generated carrier is greatly shifted instantaneously. On the other hand, there may be a case where the phase difference between the input wobble signal and the internally generated carrier gradually shifts due to temperature fluctuations and temporal fluctuations of the reproduction signal with time.

  In this case, in the present embodiment, phase adjustment is performed using the rising edge of the input wobble signal, the specific timing of the internal counter, and the generated phase difference. For example, the time difference between the rising edge of the input wobble signal and the timing when the internal counter is 0 is detected, and the detected amount is averaged through an appropriate filter, and then fed back to the internal counter value as a phase shift amount.

  In the above-described operation, there is a possibility of malfunction at a location where the MSK signal is embedded in the input wobble signal. The reason for this is that, as seen in FIG. 6B, the rising edge timing is different from the basic wobble signal in the MSK signal section. If the counter is reset at the timing detected by the MSK, an incorrect counter operation is performed. Will do.

  Even in the case of normal phase synchronization, the MSK signal section cannot detect the rising edge in the phase lock detection window of FIG. 6C, and therefore the phase lock detection circuit recognizes that the phase is not locked. It is also possible. For this reason, it is necessary not to perform counter reset, phase lock detection, and phase adjustment difference only in the MSK signal section.

  Therefore, in the present embodiment, the MSK signal is detected by looking at the time difference between the rising edge and the rising edge, and counter reset, phase lock detection, and phase adjustment dynamic difference are not performed when the MSK signal is detected.

  FIG. 3 is a block diagram showing an example of functional blocks that execute these series of operations. The input wobble signal 301 is binarized by the binarization unit 302 and the rising edge detection unit 303 detects the rising edge timing.

  On the other hand, the carrier generation counter (0-N counter) 305 is operated by the RF reproduction clock 304. The edge detection window generation unit 306 that generates a detection window with a specific value of the carrier generation counter 305 generates a rising detection window, and when the rising edge cannot be detected in the detection window, the phase lock detection unit 307 outputs a phase non-detection. A lock signal is output.

  While the phase unlock signal is output, the counter reset unit 308 resets the carrier generation counter 305 with the signal from the rising edge detection unit 303. Also, the timing of the rising edge when the carrier signal is binarized from the counter value of the carrier generation counter 305 is obtained, and the carrier edge timing generation unit 309 outputs the timing signal.

  The phase error detection unit 310 detects the phase error amount between the rising edge timing of the wobble signal from the rising edge detection unit 303 and the rising edge of the carrier generated from the carrier edge timing generation unit 309. The phase error signal from the phase error detector 310 is averaged by the filter 311 and reflected in the carrier generation counter 305 as the phase shift amount 312.

  In FIG. 3, reference numeral 313 denotes an inter-edge counter that counts the time between rising edges of the binarized wobble signal. When the MSK signal portion is determined from the count amount, the phase lock detector 307 and the phase error detector 310 Hold the action.

Next, an example of a procedure for generating a reproduction clock for detecting physical position information using the reproduction RF signal will be described with reference to the flowchart of FIG.
When the operation starts, first, in step S71, laser light is emitted toward the optical disc 101 from the light generator 102 provided in the optical pickup 104. The laser light emitted from the light generator 102 is reflected by the optical disc 101.

  Next, in step S <b> 72, the reflected light from the optical disc 101 is detected by the light detection device 103 in the optical pickup 104. The photodetection device 103 outputs a signal having a magnitude corresponding to the detected amount of reflected light.

  Next, the process proceeds to step S73, and as described above, appropriate signal processing is performed on the output signal output from the photodetection device 103 to generate a reproduction RF signal. In addition, a wobble signal having a frequency related to the meandering cycle of the track is generated. In step S74, a reproduction clock is generated from the reproduction RF signal.

  Next, the process proceeds to step S75, and internal carrier signal generation is performed based on the recovered clock generated in step S74. Internal carrier signal generation is performed by operating a carrier generation counter (0 to N counter) 125 in the same manner as in recording.

  Next, proceeding to step S76, the internal carrier signal generated at step S75 and the input wobble signal are synchronized. These signals are synchronized by inputting the internal carrier signal and the input wobble signal output from the VCO 112 to the carrier generation counter 125. The input wobble signal is transmitted through the wobble detection circuit 116, the level adjustment unit 117, the LPF 118, the A / D converter 119, the HPF 120, the binarization circuit 121, the edge detection unit 122, the phase detection unit 123, and the phase shift circuit 124. It is supplied to the generation counter 125.

  In step S77, an MSK signal and HMW (STW) are generated. The procedure for generating these signals is as described above.

  In the present embodiment, a reproduction clock is generated for detecting physical position information using the reproduction RF signal. As a result, disturbance elements due to wobble can be eliminated as compared with the case where the reproduction clock is generated using the clock from the wobble PLL. In addition, since the recovered clock can be obtained by providing only one VCO, the circuit area and power consumption can be reduced and simplified. Further, since it becomes possible to achieve phase synchronization between the wobble signal necessary for detecting the ADIP address and the internal carrier signal during reproduction, address reading can be performed during operation in the reproduction mode.

  In the above description, the operation is performed using the rising edge of the input wobble waveform, but the falling edge may be used. Alternatively, the operation may be performed using both the rising edge and the falling edge.

  In the above description, FIG. 1 is shown to explain the main functions used at the time of playback, FIG. 2 is shown to explain the main functions used at the time of recording, and among the configurations used at the time of playback, FIG. 3 is shown to explain the configuration of the main part. However, each of these functions is provided in one recording optical disk device, and as described above, blocks having the same name perform the same function even if the numbers are different.

(Another embodiment according to the present invention)
Each means constituting the optical disk device according to the embodiment of the present invention described above can be realized by operating a program stored in a RAM or ROM of a computer. This program and a computer-readable recording medium recording the program are included in the present invention.

  In addition, the present invention can be implemented as a system, apparatus, method, program, storage medium, or the like, and can be applied to a system composed of a plurality of devices. Moreover, you may apply to the apparatus which consists of one apparatus.

  In the present invention, a software program (in the embodiment, a program corresponding to the flowchart shown in FIG. 7) for executing each step in the above-described optical disk device control method is directly or remotely supplied to the system or apparatus. . In addition, this includes a case where the system or the computer of the apparatus is also achieved by reading and executing the supplied program code.

  Accordingly, since the functions of the present invention are implemented by computer, the program code installed in the computer also implements the present invention. In other words, the present invention includes a computer program itself for realizing the functional processing of the present invention.

  In that case, as long as it has the function of a program, it may be in the form of object code, a program executed by an interpreter, script data supplied to the OS, and the like.

  Various recording media can be used as a recording medium for supplying the program. For example, floppy (registered trademark) optical disk, hard optical disk, optical disk, magneto-optical disk, MO, CD-ROM, CD-R, CD-RW, magnetic tape, nonvolatile memory card, ROM, DVD (DVD-ROM, DVD) -R).

  As another program supply method, a browser on a client computer is used to connect to an Internet home page. The computer program itself of the present invention or a compressed file including an automatic installation function can be supplied from the homepage by downloading it to a recording medium such as a hard optical disk.

  It can also be realized by dividing the program code constituting the program of the present invention into a plurality of files and downloading each file from a different homepage. That is, a WWW server that allows a plurality of users to download a program file for realizing the functional processing of the present invention on a computer is also included in the present invention.

  In addition, the program of the present invention is encrypted, stored in a storage medium such as a CD-ROM, distributed to users, and key information for decryption is downloaded from a homepage via the Internet to users who have cleared predetermined conditions. Let It is also possible to execute the encrypted program by using the key information and install the program on a computer.

  In addition to the functions of the above-described embodiments being realized by the computer executing the read program, the OS running on the computer performs part or all of the actual processing. Also, the functions of the above-described embodiments can be realized.

  Further, the program read from the recording medium is written in a memory provided in a function expansion board inserted into the computer or a function expansion unit connected to the computer. Thereafter, the CPU of the function expansion board or function expansion unit performs part or all of the actual processing based on the instructions of the program, and the functions of the above-described embodiments are realized by the processing.

1 is a block diagram showing an embodiment of an optical disc apparatus of the present invention and showing a main configuration used at the time of reproduction. FIG. FIG. 3 is a block diagram illustrating an example of a configuration of main functions necessary for explaining an ADIP address detection method during a recording operation according to an embodiment of the optical disc apparatus of the present invention. 1 is a block diagram illustrating an embodiment of an optical disc apparatus according to the present invention, illustrating an example of a functional block that performs an operation of detecting an MSK signal and not performing counter reset, phase lock detection, and phase adjustment dynamic difference when an MSK signal is detected; It is. It is a wave form diagram explaining the flow of the method of detecting an ADIP address. It is a wave form diagram explaining the procedure which synchronizes the phase of a carrier and an input wobble signal. It is a figure explaining a mode that the malfunctioning which generate | occur | produces in the location where the MSK signal was embedded in the input wobble signal is prevented. It is a flowchart explaining the outline of the procedure which produces | generates the reproduction | regeneration clock for detecting physical position information using a reproduction | regeneration RF signal.

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 Optical disk 102 Light generation apparatus 103 Photodetection apparatus 104 Optical pick-up 105 RF detection circuit 106 Level adjustment part 107 Low-pass filter 108 A / D converter 109 Waveform equalizer 110 Phase comparison part 111 Loop filter 112 VCO
113 Data determination unit 114 Demodulation unit 115 End Of Code
116 Wobble detection circuit 117 Level adjustment unit 118 LPF
119 A / D converter 120 HPF
121 Binarization circuit 122 Edge detection unit 123 Phase detection unit 124 Phase shift circuit 125 Carrier generation counter 126 Carrier generation table 127 Carrier signal 128 for MSK and HMW (STW) detection Address detection unit

Claims (11)

An optical disc apparatus for reproducing data from an optical disc on which tracks meandering with a predetermined cycle are formed,
Generating means for generating a reproduction RF signal from the reflected light of the light beam reflected by the optical disc, and generating a wobble signal having a frequency related to the meandering period of the track;
Regenerated clock generating means for generating a regenerated clock from the regenerated RF signal;
Internal carrier signal generating means for generating an internal carrier signal from the recovered clock;
Phase synchronization means for synchronizing the phase of the internal carrier signal and the wobble signal;
An optical disk apparatus comprising: a detection carrier signal generating means for generating a detection carrier signal for detecting address information of the optical disk based on an output signal of the phase synchronization means. An optical disc apparatus for reproducing data from an optical disc on which tracks meandering with a predetermined cycle are formed,
A light beam irradiation means for irradiating a light beam to a track formed on the optical disc;
Reproduction RF signal generation means for generating a reproduction RF signal using reflected light of the light beam irradiated from the light beam irradiation means and reflected by the optical disc;
Clock generating means for generating a first clock phase-synchronized with the RF signal generated by the reproduction RF signal generating means;
Wobble signal generating means for generating a wobble signal having a frequency related to the meandering period of the track using the reflected light of the light beam;
Counting means for counting the first clock and generating a second clock having a frequency corresponding to the frequency of the wobble signal;
Phase shift means for detecting a phase difference between the wobble signal and the second clock and shifting the value of the counting means so that the phases of the first clock and the second clock are synchronized based on the phase difference. When,
An optical disc apparatus comprising: address information detecting means for detecting address information of the optical disc using the wobble signal and the second clock.   The address information detection means includes means for generating a wobble carrier signal having a frequency corresponding to the wobble signal using the second clock, and multiplication means for multiplying the wobble signal and the wobble carrier signal. 3. The optical disc apparatus according to claim 2, wherein the address information is detected using an output of the multiplication means.   A means for generating a binary signal by comparing the wobble signal with a predetermined threshold and a means for resetting the counting means in response to a rising or falling edge of the binary signal. Item 4. The optical disk device according to Item 2 or 3. A method of controlling an optical disc apparatus for reproducing data from an optical disc on which tracks meandering at a predetermined cycle are formed,
Generating a reproduction RF signal from the reflected light of the light beam reflected by the optical disc, and generating a wobble signal having a frequency related to the meandering period of the track;
A reproduction clock generation step of generating a reproduction clock from the reproduction RF signal;
An internal carrier signal generating step for generating an internal carrier signal from the recovered clock;
A phase synchronization step of synchronizing the phases of the internal carrier signal and the wobble signal;
And a detection carrier signal generation step of generating a detection carrier signal for detecting address information of the optical disc based on an output signal of the phase synchronization step. A method of controlling an optical disc apparatus for reproducing data from an optical disc on which tracks meandering at a predetermined cycle are formed,
A light beam irradiation step of irradiating a light beam to a track formed on the optical disc;
A reproduction RF signal generation step of generating a reproduction RF signal using reflected light of the light beam irradiated in the light beam irradiation step and reflected by the optical disc;
A clock generation step of generating a first clock phase-synchronized with the RF signal generated in the reproduction RF signal generation step;
Generating a wobble signal having a frequency related to the meandering period of the track using the reflected light of the light beam;
A counting step of counting the first clock and generating a second clock having a frequency corresponding to the frequency of the wobble signal;
A phase shift step of detecting a phase difference between the wobble signal and the second clock, and shifting the value of the counting step so that the phases of the first clock and the second clock are synchronized based on the phase difference. When,
An optical disc apparatus control method comprising: an address information detection step of detecting address information of the optical disc using the wobble signal and the second clock.   The address information detection step includes a step of generating a wobble carrier signal having a frequency corresponding to the wobble signal using the second clock, and a multiplication step of multiplying the wobble signal and the wobble carrier signal. 7. The method of controlling an optical disc apparatus according to claim 6, wherein the address information is detected using an output of the multiplication step.   A step of generating a binary signal by comparing the wobble signal with a predetermined threshold, and a step of resetting a counter value of the counting step in response to a rising or falling edge of the binary signal. A method for controlling an optical disc apparatus according to claim 6 or 7. A program for causing a computer to execute a step of controlling an optical disc apparatus that reproduces data from an optical disc on which tracks meandering with a predetermined cycle are formed.
Generating a reproduction RF signal from the reflected light of the light beam reflected by the optical disc, and generating a wobble signal having a frequency related to the meandering period of the track;
A reproduction clock generation step of generating a reproduction clock from the reproduction RF signal;
An internal carrier signal generating step for generating an internal carrier signal from the recovered clock;
A phase synchronization step of synchronizing the phases of the internal carrier signal and the wobble signal;
A program for causing a computer to execute a detection carrier signal generation step for generating a detection carrier signal for detecting address information of the optical disc based on an output signal of the phase synchronization step. A program for causing a computer to execute a step of controlling an optical disc apparatus that reproduces data from an optical disc on which tracks meandering with a predetermined cycle are formed.
A light beam irradiation step of irradiating a light beam to a track formed on the optical disc;
A reproduction RF signal generation step of generating a reproduction RF signal using reflected light of the light beam irradiated in the light beam irradiation step and reflected by the optical disc;
A clock generation step of generating a first clock phase-synchronized with the RF signal generated in the reproduction RF signal generation step;
Generating a wobble signal having a frequency related to the meandering period of the track using the reflected light of the light beam;
A counting step of counting the first clock and generating a second clock having a frequency corresponding to the frequency of the wobble signal;
A phase shift step of detecting a phase difference between the wobble signal and the second clock, and shifting the value of the counting step so that the phases of the first clock and the second clock are synchronized based on the phase difference. When,
A program causing a computer to execute an address information detection step of detecting address information of the optical disc using the wobble signal and the second clock.   A computer-readable storage medium storing the program according to claim 9 or 10.

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