WO2008044503A1 - Dispositif de commande de disque optique et procédé de commande de disque optique - Google Patents

Dispositif de commande de disque optique et procédé de commande de disque optique Download PDF

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Publication number
WO2008044503A1
WO2008044503A1 PCT/JP2007/069072 JP2007069072W WO2008044503A1 WO 2008044503 A1 WO2008044503 A1 WO 2008044503A1 JP 2007069072 W JP2007069072 W JP 2007069072W WO 2008044503 A1 WO2008044503 A1 WO 2008044503A1
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WIPO (PCT)
Prior art keywords
jitter
optical disc
address
value
control method
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PCT/JP2007/069072
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English (en)
Japanese (ja)
Inventor
Yorikazu Takao
Youichi Ogura
Daigo Senoo
Yasuyuki Tomida
Keita Takada
Atsushi Kiyomura
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Panasonic Corporation
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Publication of WO2008044503A1 publication Critical patent/WO2008044503A1/fr

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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
    • G11B7/0045—Recording
    • G11B7/00458—Verification, i.e. checking data during or after recording
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
    • G11B7/005—Reproducing

Definitions

  • the present invention relates to a recording / reproducing method and apparatus for recording / reproducing information while driving an optical disc in which address information is embedded, which can reproduce and record information, and particularly to an optical disc.
  • the present invention relates to a measurement method and apparatus for measuring the quality of a data signal obtained by doing so.
  • an energy beam includes an electromagnetic wave such as a light beam, a particle beam such as an electron or an ion, and particularly suitable examples of the light beam include a light beam of visible light, infrared light, and ultraviolet light. Can be mentioned.
  • disc-shaped recording / reproducing media such as R, DVD-R, BD-R, etc. are widely used on a daily basis.
  • These disc-shaped recording / reproducing media generally record information by forming a mark / space state by irradiation of an energy beam along a guide groove having a spiral side surface, and are provided along the guide groove. The information is reproduced by reading the reflected light obtained by irradiating the energy beam to the marked / space.
  • Patent Document 1 JP-A-11 264850
  • an external measuring device such as a jitter analyzer is generally used to measure the jitter of a reproduction signal.
  • jitter measurement using external measurement equipment has the following issues.
  • the effect on the jitter value with respect to the time error unit becomes larger.
  • the effect of 10x playback is 10 times greater. The degree is great. Therefore, in jitter measurement using an external measurement device under high-speed playback, the influence of noise due to path transmission becomes dominant, and it is very difficult to obtain jitter measurement results for the playback signal itself. is there.
  • the present invention eliminates the above problems (1) to (3) in jitter measurement using an external measuring device, and realizes high-quality jitter measurement even under high-speed reproduction.
  • a control device and an optical disc control method are provided.
  • the inventions of claims 1 and 12 realize jitter measurement in the optical disc control apparatus.
  • the jitter detection means in the invention of claim 1 detects an edge of the reproduction signal, and is ideal. The error from the edge position is measured, and the playback signal is input and the jitter value is output.
  • the jitter value transfer means stores the output jitter value in a buffer every time the jitter value is output from the jitter detection means. Therefore, by controlling the jitter detection means and jitter value transfer means by the CPU, the jitter value of the reproduced signal is stored in the buffer, and jitter measurement is realized by referring to the stored jitter value.
  • jitter measurement can be performed without the need for an external measuring device or the like. Therefore, problems (1) to (3) in the jitter measurement using an external measuring device are inevitably solved.
  • the inventions of claims 2 and 13 realize the jitter measurement in the inventions of claims 1 and 12 in an arbitrary section.
  • the address representing the position information of the data on the optical disk is acquired, and only the section where the jitter value is to be measured. Jitter value can be obtained.
  • the jitter value of only the inner / outer peripheral part of the optical disc, or the jitter value of only the land / group is acquired in the case of DVD-RAM! /, In the case of the section to be acquired
  • By acquiring the address to be acquired and turning on jitter measurement control it is possible to acquire the jitter value only for the section to be acquired.
  • the inventions of claims 3 and 14 are obtained by adding arithmetic processing to the jitter value obtained by the jitter measurement in the inventions of claims 1 and 12.
  • statistical processing can be performed on the acquired jitter value, and the aspect of the jitter value can be known by referring to only the calculation processing result.
  • the inventions of claims 4 and 15 reduce the processing time by operating the jitter acquisition process and the jitter value calculation process of the inventions of claims 3 and 14 in parallel. Since the calculation processing is performed using the acquired jitter value as the calculation target, the processing cannot be started until the jitter value acquisition processing is completed. However, every time the jitter acquisition process for each section is completed, the jitter acquisition process is divided into sections that have already been completed, even before the jitter acquisition process for other sections is completed in a nonlinear manner. By sequentially executing the calculation processing, parallel processing of jitter acquisition processing and jitter value calculation processing can be realized. By applying the present invention, calculation processing for jitter values can be executed in only the processing time for jitter acquisition processing. It becomes possible.
  • the inventions of claims 5 and 16 are obtained by adding abnormal state detection of the jitter detecting means to the inventions of claims 1 and 12.
  • the jitter detection means receives a reproduction signal as an input, and an abnormal reproduction signal may be input depending on the force S for detecting the jitter with respect to the edge of the reproduction signal, the optical disk, and the state of the optical disk control.
  • an abnormal reproduction signal may be input depending on the force S for detecting the jitter with respect to the edge of the reproduction signal, the optical disk, and the state of the optical disk control.
  • the present invention it is possible to always obtain only the jitter value for a normal reproduction signal, and it is possible to improve the accuracy of jitter measurement.
  • the inventions of claims 6 and 17 are obtained by adding abnormal state detection of jitter value transfer processing to the inventions of claims 1 and 12.
  • the jitter value transfer means transfers the jitter value obtained by the jitter detection means to the buffer.
  • the jitter value cannot be transferred because the jitter value cannot be acquired due to an abnormal state of the reproduction signal.
  • Value transfer count may be abnormal.
  • by monitoring the number of transfers in the jitter value transfer process and notifying the CPU of the status it is possible to avoid acquiring jitter values when the number of transfers is abnormal. Therefore, by applying the present invention, it is possible to always obtain only the jitter value corresponding to the normal number of transferred jitter values, and it is possible to improve the accuracy of jitter measurement.
  • the inventions of claims 7 and 18 are obtained by adding an abnormal state detection of address acquisition in optical disc playback to the inventions of claims 2 and 13. For example, in the address acquisition during the jitter acquisition process, if an address value different from the section to be measured is acquired, it can be determined that the jitter value corresponding to the measurement section cannot be acquired. Also, since the address is acquired from the playback signal, it can be determined that the playback signal may be in an abnormal state if the address value cannot be acquired. In this way, the jitter value measured when an abnormal address is acquired is considered to be unreliable. Therefore, by monitoring the address acquisition status and notifying the CPU of the status, it is possible to reduce the reliability when the address is abnormal and to avoid acquiring the jitter value. By applying the present invention, it is possible to acquire the jitter value only when the address is normally acquired, and it is possible to improve the accuracy of jitter measurement.
  • the inventions of claims 8 and 19 are different from the inventions of claims 1 and 12 in terms of a track for reproducing an optical disc. This is the addition of king state anomaly detection.
  • an optical disc is provided with a guide groove for accurately irradiating an energy beam to a spirally arranged mark / space corresponding to recorded information.
  • the energy beam is correctly applied to the center of the guide groove, that is, the mark / space position.
  • the state where the energy beam is not irradiated to the center of the guide groove, that is, the state where the energy beam is correctly irradiated to the mark / space position is defined as the tracking NG state. If the tracking beam is in the NG state during jitter acquisition processing, the energy beam is not correctly irradiated to the mark / space, so a normal playback signal cannot be acquired, and the jitter value that can be acquired is also an abnormal value. Can be judged. Therefore, by monitoring the tracking state and notifying the CPU of the state, it is possible to avoid acquiring an abnormal jitter value in the tracking NG state. By applying the present invention, it is possible to acquire a jitter value only in the tracking OK state, and it is possible to improve the accuracy of jitter measurement.
  • the inventions of claims 9 and 20 are obtained by adding a jitter acquisition interruption process at the time of abnormality detection to the inventions of claims 5 to 8, 16 to 19;
  • the jitter acquisition process if an abnormality is detected during the process, it can be determined that an abnormal jitter value has been acquired, and it can also be determined that the jitter value acquired thereafter has low reliability.
  • the jitter value after anomaly detection is not adopted as the measurement result, and it may be possible to move to the next processing (for example, try measurement again). Therefore, by stopping the jitter acquisition process after detecting the abnormal state and ending the process, it is possible to eliminate redundant waiting time until the next process is performed.
  • the inventions of claims 10 and 21 are obtained by adding jitter calculation processing at the time of detecting an abnormality to the inventions of claims 3-8, 14-;
  • jitter acquisition process if an abnormality is detected during the process, it can be determined that an abnormal jitter value has been acquired, and it can also be determined that the jitter value acquired thereafter has low reliability.
  • various arithmetic processes can be applied to the jitter values obtained before the anomaly detection. Reliable jitter value even when anomaly is detected It is possible to obtain an operation result for the above. Therefore, by applying the present invention, it is possible to obtain a reliable calculation result even when an abnormal state is detected, and it is not necessary to add processing such as performing measurement again.
  • the inventions of claims 11 and 22 are the inventions of claims 1 and 12 in which devices relating to the control of the jitter detection means and the jitter value transfer means are added.
  • the jitter detection means and the jitter value transfer means are functionally completely separate, and in general, a system that operates these means asynchronously is more synchronous. It is easier to build than an operating system.
  • the amount of jitter value acquisition is controlled by the jitter value transfer means, the amount of acquisition is in accordance with the control, such as when performing arithmetic processing on the acquired jitter value as in the inventions of claims 3 and 14, for example. It is more convenient to obtain it.
  • the jitter detection means is stopped before the jitter value transfer means is stopped in the jitter acquisition process due to an asynchronous problem, even if the jitter value transfer means is operating, Since the jitter detection means for generating the jitter value is stopped, the jitter acquisition amount as controlled may not be obtained. On the other hand, if the operation of the jitter detection means is continued until the jitter value acquisition by the jitter value transfer means is completed as in the present invention, the jitter value acquisition up to the specified number can be guaranteed. .
  • the inventions of claims 23 and 34 employ DRAM as buffer means for storing jitter values.
  • DRAM is often used as a buffer for recording / reproducing data.
  • DRAM incorporated in the system in advance as the buffer means.
  • the inventions of claims 24 and 35 are characterized in that the arithmetic processing for the jitter acquisition result is an average value calculation processing.
  • the measured jitter value is confirmed one point at a time! /
  • a statistical index for all jitter values in the measurement range can be confirmed with one data, that is, at a glance. It can be obtained as a straight line.
  • the inventions of claims 25 and 36 are characterized in that the arithmetic processing for the jitter acquisition result is to obtain the square root in addition to the average value calculation. This is based on the assumption that the jitter detection means is implemented in a circuit without square root calculation. In other words, when the output value format from the jitter detection means is the square value of the jitter value, the jitter value can be obtained by calculating the square root after calculating the average value as an arithmetic process for the buffer data.
  • the present invention is implemented by, for example, a combination of a CPU and a program, the increase in the program amount due to the square root processing is much smaller than that of the square root arithmetic circuit, so an inexpensive system has been constructed! / It is effective for.
  • the inventions of claims 26 and 37 are characterized in that the buffer data calculation process and the jitter value acquisition process are implemented using the same CPU. If the buffer data calculation processing and the jitter value acquisition processing have a time allowance for the CPU capability, it is possible to construct an inexpensive system by applying the present invention.
  • the inventions of claims 27 and 38 are characterized in that the buffer data calculation process and the jitter value acquisition process are implemented using different CPUs. For example, if you want to perform jitter measurement on a playback signal during high-speed playback, if you implement buffer data calculation processing and jitter value acquisition processing in combination with a CPU and a program, the time constraints and other CPUs It may be difficult to implement. At this time, by introducing the present invention and implementing buffer data calculation processing and jitter value acquisition processing using separate CPUs, time constraints are eased and jitter measurement during high-speed playback becomes possible. .
  • the inventions of claims 28 and 39 are characterized in that in the buffer data calculation processing, calculation is performed by thinning out data in the calculation target range. For example, when the buffer data calculation process calculates the average value as in the inventions of claims 24 and 35, the average characteristics of the calculation range can be obtained even if the calculation range data, that is, the jitter value is skipped by one. In addition, the amount of calculation processing is about 1 ⁇ 2.
  • the present invention is effective when performing arithmetic processing at high speed.
  • the inventions of claims 29 and 40 add an abnormal value detection process to the buffer data calculation process.
  • the abnormal value is excluded from the calculation target.
  • the buffer data calculation process is for calculating an average value
  • the calculation target includes an abnormal value
  • an error occurs in the calculated average value. End up.
  • the application of the present invention makes it possible to always perform calculation using only normal jitter values, and to realize highly accurate average jitter value calculation.
  • an abnormal value detection process that adds an abnormal value when the data value is outside a certain range is added, and the abnormal value is excluded from the calculation target. It is characterized by this. Jitter values obtained in jitter measurement basically vary within a certain range without significant fluctuations. Therefore, when a jitter value outside a certain range is acquired, it can be considered that a normal jitter value has not been acquired, for example, a reproduced signal input to the jitter detection means has become abnormal. Therefore, by applying the present invention, it is always possible to perform calculations using only normal jitter values, and high-precision average jitter value calculation can be realized.
  • the inventions of claims 31 and 42 are characterized in that, in the address abnormality detection process, a case where addresses cannot be obtained continuously is determined as an abnormal state. If the address could not be acquired in the address acquisition process, the optical disk playback process will be in an abnormal state, so it is thought that normal jitter measurement cannot be performed. There may have been no. In this case, in the subsequent address acquisition, if the address could be acquired normally, it could not be acquired by chance. Conversely, if the address could not be acquired continuously, it could be determined that the address acquisition was abnormal. Therefore, by introducing the present invention, it is possible to reduce the false detection rate of the address acquisition abnormal state, and it is possible to realize efficient jitter measurement.
  • the inventions of claims 32 and 43 are characterized in that, in the address abnormality detection processing, the address acquisition history for the last n times is referred to, and if there is no continuity of a series of addresses, it is determined as an abnormal state. To do. In the address acquisition process, if the most recent address and the acquired address are not continuous, or if the optical disk playback process is in an abnormal state, it is possible that normal jitter measurement cannot be performed. There is a possibility that it was detected erroneously. In this case, if address continuity is restored in subsequent address acquisition, If the continuity of the address cannot be confirmed on the contrary by just detecting it erroneously, it can be determined that the address acquisition is abnormal. Therefore, the introduction of the present invention makes it possible to reduce the false detection rate of the address acquisition abnormal state, and realize an efficient jitter measurement.
  • the present invention it is possible to measure the accuracy and efficiency of the optical disk control device in the optical disk drive system with high accuracy and efficiency without requiring an external measuring device. Further, according to the present invention, it is possible to perform highly accurate and efficient jitter measurement even in jitter measurement during high-speed reproduction. Therefore, it is possible to accurately measure the recording / reproduction quality, and the present invention is very effective in developing and manufacturing an optical disc drive system that performs high-quality recording / reproduction.
  • FIG. 1 is a block diagram showing an overall configuration of an optical disc control apparatus according to Embodiment 1 of the present invention.
  • FIG. 2 is a flowchart of jitter measurement processing in the optical disc control apparatus according to Embodiment 1 of the present invention.
  • FIG. 3 is a flowchart of an address interrupt process in the optical disc control device according to the first embodiment of the present invention.
  • FIG. 4 is a flowchart of address abnormality determination processing in the optical disc control apparatus according to Embodiment 1 of the present invention.
  • FIG. 5 is a flowchart of jitter transfer block end interrupt processing in the optical disc control apparatus according to Embodiment 1 of the present invention.
  • FIG. 6 is a flowchart of an acquired jitter value abnormality determination process in the optical disc control apparatus according to Embodiment 1 of the present invention.
  • FIG. 7 is a flowchart of a calculation process for buffer data in the optical disc control apparatus according to Embodiment 1 of the present invention. 8] FIG. 8 shows an optical disk control apparatus according to Embodiment 2 of the present invention.
  • FIG. 1 A first figure.
  • FIG. 9 shows an optical disk control apparatus according to Embodiment 3 of the present invention.
  • FIG. 1 A first figure.
  • FIG. 10 is a flowchart of the jitter transfer block end interrupt process in the optical disc control apparatus according to the fourth embodiment of the present invention.
  • FIG. 11 is a flowchart of arithmetic processing for the data in the optical disc control apparatus according to Embodiment 4 of the present invention.
  • FIG. 1 is a block diagram showing a configuration of an optical disc drive system including an optical disc control apparatus according to an embodiment of the present invention.
  • the optical disc 100 reproduces information by irradiating an energy beam such as a laser onto a mark / space embedded in a spiral shape, and at the same time reproduces information at a predetermined interval (hereinafter referred to as a sector). It is also possible to obtain an address that provides information.
  • the optical disk 100 is embedded with a guide groove for aligning the energy beam irradiation position to the mark / space!
  • the optical disc control device 200 converts a reproduction signal obtained by irradiating the optical disc 100 with an energy beam into information data to be provided to the host 300.
  • the jitter detection circuit 211 is the only circuit added to the conventional optical disk drive system. After that, in addition to the combination of the CPU and the program, the circuit in the conventional optical disk drive system is used, so the present invention can be introduced with a small change.
  • each circuit incorporated in the optical disc control apparatus 200 will be described.
  • the spindle motor 201 has a function of rotating the optical disc 100.
  • the CPU 206 has a function of monitoring the tracking state of the optical disk 100 with the energy beam irradiation and referring to the state.
  • the spindle motor 201 has a tracking abnormality detection unit 201a that monitors the tracking state of the optical disc 100 by laser irradiation and detects a tracking abnormality state.
  • the optical pickup 202 has a function of irradiating an optical beam 100 with an energy beam such as a laser and obtaining a reproduction signal from reflected light.
  • the address acquisition circuit 203 has a function of acquiring a sector address corresponding to the reproduction position from the reproduction signal obtained by the optical pickup 202. The sector address is updated for each sector and used for processing by the CPU 206. Further, the address acquisition circuit 203 has a function of notifying the CPU 206 of an interrupt at the address acquisition timing, and a function of allowing the CPU 206 to refer to the failure state when address acquisition fails at the address acquisition timing.
  • the address acquisition circuit 203 has an address abnormality detection unit 203a that monitors the acquisition state of the address acquired by the address acquisition circuit 203 and detects an abnormality in the address acquisition state.
  • the NRZI conversion circuit 204 has a function of processing the reproduction signal obtained by the optical pickup 202 and converting it into digital data (NRZI signal).
  • the demodulating circuit 205 has a function of demodulating the NRZI signal converted by the NRZI converting circuit 204. For example, in the case of a DVD, a 16-bit NRZI signal is converted to 8-bit data.
  • the CPU 206 has a function of controlling each circuit in the optical disc control device 200 by a program.
  • the program realizes the information reproduction function of the optical disc control apparatus 200 when reproducing original information and the jitter measurement function when measuring jitter.
  • the jitter / data transfer circuit 207 has a function of transferring the jitter data obtained by the jitter detection circuit 211 to the buffer circuit 208 during jitter measurement. Further, it has a function of transferring the reproduction data obtained by the demodulation circuit 205 to the buffer circuit 208 at the time of original information reproduction. In addition, the information data stored in the buffer circuit 208 is transferred to the error correction circuit 209 and error correction data obtained from the error correction circuit 209 is transferred to the buffer circuit 208 at the time of original information reproduction. In addition, it has a function of transferring data stored in the buffer circuit 208 to the host transfer circuit 210.
  • the transfer amount of the jitter / data transfer circuit 207 can be set by the CPU 206, and has a function of notifying the CPU 206 of an interrupt at the timing when processing of the specified transfer amount is completed. It also has a function that allows continuous transfer processing to be continued by resetting the transfer amount during transfer processing.
  • the jitter / data transfer circuit 207 includes a jitter value transfer number output unit 207a for outputting the jitter value transfer number from the jitter / data transfer circuit 207 to the nother circuit 208, and jitter transfer in the jitter / data transfer circuit 207. It has a jitter transfer number abnormality detection unit 207b for detecting the number abnormality.
  • the nother circuit 208 has a function of storing data.
  • the buffer circuit 208 is
  • the error correction circuit 209 is a function for performing error correction on the data transferred from the jitter / data transfer circuit 207 when reproducing the original information, and notifying the jitter / data transfer circuit 207 of the error correction information.
  • the host communication circuit 210 has a function of controlling data communication with the host 300.
  • the jitter detection circuit 211 has a function of processing the reproduction signal obtained by the optical pickup 202 and obtaining the square value of the jitter of the reproduction signal.
  • the CPU 206 can control the jitter detection ON / OFF, and transfers the square value of the jitter to the jitter / data transfer circuit 207 from the next sector which is set to the jitter detection ON by the CPU 206. It also has a function that allows the CPU 206 to refer to the normal / abnormal state of jitter detection.
  • the jitter detection circuit 211 includes a jitter value abnormality detection unit 211a that detects an abnormal state of the information reproduction signal input.
  • the notadata operation circuit 212 calculates the data from the buffer circuit 208 and outputs the operation result to the buffer circuit 208.
  • the nother data calculation circuit 212 calculates the data from the buffer circuit 208 while referring to the jitter value transfer number from the jitter value transfer number output unit 207a in the jitter / data transfer circuit 207.
  • the host 300 is a connection destination of the optical disc control device 200 and uses data obtained from the optical disc control device 200, and is, for example, a PC or a DVD recorder.
  • FIG. 2 shows a control flowchart of each functional block in the optical disc control apparatus 200 for realizing jitter measurement in the present invention. Note that the flowchart in FIG. 2 is realized by a program and is controlled using the CPU 206.
  • the measurement start address and the number of measurement sectors of the optical disc 100 to be subjected to jitter measurement are acquired (step S 101).
  • the acquisition method is the host via the host communication circuit 210.
  • the NRZI conversion circuit 204 and the demodulation circuit 205 are turned OFF, and the mode is switched from the original reproduction processing to the mode for performing jitter measurement (step S102).
  • the jitter / data transfer circuit 207 is initialized, and the mode is switched to the mode for transferring the jitter value from the jitter detection circuit 211 (step S 103).
  • Various flags and counters are initialized (step S104).
  • the abnormality detection flag is set to OFF
  • the end flag is set to OFF
  • the jitter transfer circuit activation count is set to “0”
  • the jitter control acquisition sector count is set to “0”.
  • step S 105 A flowchart of the address interrupt process at step S105 in FIG. 2 is shown in FIG. 3, and a flowchart of the jitter transfer circuit end interrupt process is shown in FIG.
  • step S 106 After performing step S 105 in FIG. 2, it is detected whether or not the end flag is ON (step S 106), and the process waits until an abnormality is detected, the force at which the jitter value acquisition from the jitter detection circuit 211 ends.
  • step S 203 when the acquired address is abnormal in the address interrupt process of FIG. 3 (step S203), when the acquired jitter value is abnormal in the jitter transfer circuit end interrupt process of FIG. 5 (step S402), and the jitter transfer circuit activation count Is greater than the number of measured sectors.
  • step S 405 When it is determined that all the jitter has been transferred from the data transfer circuit 207 to the buffer circuit 208 (step S 405), the CPU 206 end flag is turned ON, and step S 106 in FIG. Proceed to
  • step S106 When the end flag is ON (Yes in step S106), the address interrupt notified from the address acquisition circuit 203 and the jitter transfer circuit end interrupt notified from the jitter / data transfer circuit 207 are prohibited, and jitter measurement is performed.
  • the interrupt processing for processing is terminated (step S107).
  • the jitter detection circuit 211 is set to OFF in accordance with the CPU 206 force and other instructions (step S10 8). By turning OFF at this timing, it is ensured that the transfer of the specified number of jitter values by the jitter / data transfer circuit 207 has been completed.
  • the jitter / data transfer circuit 207 is initialized, and the mode is switched to the mode for transferring the reproduction data from the demodulation circuit 205 (step S109).
  • the NRZI conversion circuit 204 and the demodulation circuit 205 are turned on to switch from the jitter measurement mode to the original reproduction process (step S110).
  • step S111 After performing arithmetic processing on the noffer data (step S111), the calculated average jitter value, jitter control acquisition sector, and abnormality detection flag are notified (step S112).
  • the average jitter value, jitter control acquisition sector, and abnormality detection flag may be notified to the host 300 via the host communication circuit 210, or the measurement result may be used in the program.
  • the abnormality detection flag To be notified.
  • step S105 an abnormality in the transfer number of jitter values is detected between step S105 and step S106 in the flowchart of the jitter measurement process in FIG.
  • step S202 an address is acquired from the address acquisition circuit 203 in step S201 of the address interrupt process in FIG. 3, and it is determined whether or not the acquired address is abnormal in step S202. If the acquired address is normal (Yes in step S202), the jitter value transfer count error detection step is performed. In the jitter value transfer number error detection step, the CPU 206 RAM confirms the number of jitter normal acquisition sectors. The number of jitter normal acquisition sectors is obtained in step S403 of the jitter transfer block end interrupt process in FIG. When it is detected that the number of jitter normal acquisition sectors has not been counted up, it is determined that the jitter value transfer is abnormal.
  • FIG. 3 is a detailed flowchart of the address interrupt process in step S 105 in the jitter measurement process of the optical disc control apparatus according to the first embodiment of the present invention shown in FIG.
  • Address interrupt processing is realized by a program and controlled by the CPU 206.
  • an address value is acquired from the address acquisition circuit 203 (step S201).
  • step S202 Address abnormality determination is performed using the acquired address value (step S202).
  • the acquired address is abnormal (Yes in step S202)
  • the process proceeds to step S203.
  • the acquired address is normal (No in step S202)
  • the process proceeds to step S204 and subsequent steps.
  • step S202 When the acquisition address is abnormal (Yes in step S202), an abnormal process is performed by turning on the abnormal flag and the end flag (step S203), and the address interrupt process is terminated.
  • step S203 when the end flag is ON (step S203), the flow chart of the jitter measurement process in FIG. 2 continues. The processing from step S106 onwards is performed.
  • the CPU 206 is notified of the abnormality.
  • step S202 When the acquisition address is normal (No in step S202), the acquisition address is compared with the measurement start address (step S204), and if the acquisition address is one sector before the measurement start address (Yes in step S204) ) And jitter measurement start processing (step S205).
  • step S2 05 By turning ON the jitter detection circuit 211 and starting the jitter / data transfer circuit 207 (step S2 05), the transfer of the jitter value from the jitter / data transfer circuit 207 to the buffer circuit 208 is started.
  • a jitter acquisition value from the sector is stored in the buffer circuit 208.
  • the jitter of the information reproduction signal from the optical disk is obtained by continuing the activation of the jitter detection circuit 211 until the jitter / data transfer circuit 207 completes the transfer of a predetermined number of jitter values.
  • the jitter transfer circuit activation count is incremented by 1.
  • the jitter transfer circuit activation count is used to determine the number of measurement sectors (step S206).
  • step S207 If the number of measured sectors is two or more (Yes in step S207), start-up processing for the second sector is performed. By starting up in advance, a jitter measurement process in a continuous section is realized.
  • step S208 the jitter / data transfer circuit 207 is activated (step S208).
  • step S206 the jitter transfer circuit activation count is incremented by 1 (step S209).
  • FIG. 4 is a detailed flowchart of the address abnormality determination process in step S202 of the address interrupt process in the jitter measurement process of the optical disc control apparatus according to the first embodiment of the present invention shown in FIG.
  • the address abnormality determination process is realized by a program and controlled by the CPU 206.
  • step S301 it is detected whether the address has been acquired. If the address could not be acquired (No in step S301), it is detected whether the address could not be acquired for two consecutive sectors (step S304).
  • step S305 If the address cannot be obtained continuously for two sectors (Yes in step S304), it is determined that the address is abnormal (step S305). If address acquisition failure is in the first sector (No in step S304), the acquired address is determined to be normal (step S303) and jitter measurement continues. To do.
  • step S301 If the address can be acquired (Yes in step S301), check whether the previous address acquisition value + 1 is equal to the current address acquisition value and check the continuity with the previous acquisition address. However, if there is no continuity (No in step S302), the acquired address is determined to be in an abnormal state (step S305). If the continuity of the address is confirmed (Yes in step S302), it is determined that the acquired address is normal (step S303), and jitter measurement is continued.
  • the force described for determining the force where the most recent address and the acquired address are continuous is referred to, for example, the address acquisition history for the latest n times, If there is no continuity of the addresses, it may be determined as an abnormal state. As a result, when the latest address and the acquired address are not continuous, and there is a possibility that the address acquisition is accidentally detected, the address continuity is restored in the subsequent address acquisition. Therefore, it can be determined that the address acquisition is merely erroneously detected, and the false detection rate of the address acquisition abnormal state can be reduced.
  • FIG. 5 is a detailed flowchart of the jitter transfer block end interrupt process in step S 105 in the jitter measurement process of the optical disc control apparatus according to the first embodiment of the present invention shown in FIG.
  • Jitter transfer circuit end interrupt processing is realized by a program and controlled by the CPU 206.
  • the jitter transfer circuit end interrupt processing is performed every time the jitter value transfer for one sector is completed.
  • step S401 the acquired jitter value abnormality determination is performed (step S401).
  • the process proceeds to step S402, and when normal determination is made (No in step S401), the process proceeds to step S403. move on.
  • step S401 When the acquired jitter value is determined to be abnormal (Yes in step S401), the abnormal flag and the end flag are turned on (step S402), the abnormal process is performed, and the jitter transfer circuit end interrupt process ends.
  • step S402 when the end flag is ON (step S402), the processing subsequent to step S106 in the flowchart of the jitter measurement processing in FIG. 2 is performed.
  • the CPU 206 is notified of the abnormality.
  • the jitter normal acquisition sector count is + 1 (step S403).
  • the number of jitter normal acquisition sectors is used when determining the calculation range in the jitter calculation process of step S111 in FIG.
  • the number of jitter normal acquisition sectors is the memory of the CPU 206, and it counts up to how many sectors the jitter value has been transferred. Check the number of jitter normal acquisition sectors for each address interrupt process, and if it is counted up one by one, the jitter value is transferred normally.If it is not counted up, a jitter value transfer error occurs. ing.
  • step S404 The number of jitter transfer circuit activations and the number of measured sectors are compared (step S404), and the activation process is continued until activation for the number of measured sectors is performed.
  • step S404 When it is determined that the measurement sector whose number of times the jitter transfer circuit has been activated is greater than the number of measurement sectors (No in step S404), only the end flag is turned on (step S405), and normal end processing is performed.
  • step S405 when the end flag is ON (step S405), the processing after step S106 in the flowchart of the jitter measurement processing in FIG. 2 is performed.
  • step S404 If it is determined that the number of measurement sectors that are less than the number of measurement sectors is not activated (Yes in step S404), the jitter / data transfer block 207 is activated (step S406). In addition, the jitter transfer circuit activation count is incremented by 1 (step S407), and continuous activation processing is performed.
  • FIG. 6 is a detailed flowchart of the acquired jitter value abnormality determination in step S401 in the jitter transfer circuit end interrupt process shown in FIG.
  • the acquisition jitter value abnormality determination is realized by a program and controlled by the CPU 206.
  • step S the state of the jitter detection circuit 211 is referred to, and if it is an abnormal state (step S).
  • the acquired jitter value is determined to be abnormal (step S504).
  • step S5 Referring to the tracking state of spindle motor 201, if it is in an abnormal state (step S5
  • the acquired jitter value is determined to be abnormal (step S504).
  • the CPU 206 is notified of the abnormality.
  • step S501 If both the state of the jitter detection circuit 211 and the tracking state of the spindle motor 201 are normal (Yes in step S501, Yes in step S502), the acquired jitter value is determined to be normal. (Step S503).
  • FIG. 7 is a detailed flowchart of the calculation process for the buffer data in step S 111 in the jitter measurement process of the optical disc control apparatus according to the first embodiment of the present invention shown in FIG.
  • the arithmetic processing in step S 111 in FIG. 2 is realized by a program and controlled using the CPU 206.
  • the jitter value acquisition process and the jitter value calculation process are controlled using one CPU.
  • the CPU further includes a jitter value acquisition process and a jitter value acquisition process.
  • the data value calculation process may be controlled by a separate CPU.
  • the jitter detection circuit 211 that detects the jitter of the information reproduction signal from the optical disc 100, the buffer circuit 208 that stores the jitter data, and the jitter detection circuit 211.
  • a jitter value transfer circuit 207 for transferring the jitter value detected by the buffer circuit 208 to the buffer circuit 208.
  • the jitter detection circuit 211 and the jitter value transfer circuit are controlled by the CPU 206, and an information reproduction signal from the optical disc 100 is controlled. Since jitter is acquired, there is no need for an external jitter measurement device, noise is unlikely to occur during jitter measurement, and jitter measurement can be performed at low cost.
  • the calculation process in step S111 of the jitter measurement process in FIG. 2 of the optical disc control apparatus in the first embodiment may be changed to the process shown in the flowchart in FIG.
  • the processing shown in FIG. 8 is also realized by a program and controlled using the CPU 206.
  • the block diagram of the optical disk control device according to the second embodiment is the same as the block diagram of the optical disk control device according to the first embodiment shown in FIG. 1, and a description thereof will be omitted.
  • the buffer data calculation circuit 212 when the data within the calculation target range includes an abnormal value, the buffer data calculation circuit 212 performs a calculation process by removing the abnormal value.
  • the data within the calculation target range is the data with the threshold B or higher and the threshold A or lower as abnormal values.
  • step S701 only the jitter value within the range of A to B is compared to the square jitter value for the number of normal sectors counted in step S403 of the jitter transfer circuit end interrupt processing of FIG. Is obtained (step S701).
  • V ⁇ jitter values that are not within the range of A to B are not subject to calculation! /
  • So A to B should be set within the range of realistic jitter values.
  • A is a square jitter value corresponding to 4%
  • B is a square jitter value corresponding to 30%.
  • the cumulative value of jitter values is divided by the cumulative number of times of addition, and the average value of the squared jitter values is obtained (step S702).
  • the buffer data calculation block 212 sets data that is not less than the threshold value B and not more than the threshold value A among the data within the calculation target range as an abnormal value, and removes the abnormal value. Since the arithmetic processing is performed, the accuracy of the average jitter value can be increased.
  • step S111 of the jitter measurement process in FIG. 2 of the optical disk control apparatus in the first embodiment may be changed to the process shown in the flowchart in FIG.
  • the processing shown in FIG. 9 is also realized by a program and controlled using the CPU 206.
  • the block diagram of the optical disk control device in the third embodiment is the same as the block diagram of the optical disk control device in the first embodiment shown in FIG. 1, and a description thereof will be omitted.
  • the cumulative addition value for only the odd-numbered jitter value is used for the square jitter value for the number of normal sectors counted in step S403 of the jitter transfer circuit end interrupt processing of FIG. Obtain (step S801).
  • the accumulated jitter is obtained by thinning the acquired jitter value once every two times, the amount of cumulative addition processing is halved.
  • step S802 the cumulative addition value of the jitter value is divided by the cumulative addition count, and 2 An average value of the power jitter value is obtained (step S802).
  • the buffer data calculation circuit 212 performs calculation processing by thinning out data within the calculation target range, so that the processing amount of cumulative addition is reduced and processing is performed. Time can be increased.
  • the jitter transfer circuit end interrupt process in step S105 of the jitter measurement process in FIG. 2 of the optical disc control apparatus in the first embodiment is changed to the flow chart process shown in FIG. 10, and the jitter measurement process in FIG.
  • the calculation process in step S111 may be changed to the flowchart process shown in FIG.
  • the processing shown in FIG. 10 is also realized by a program and controlled using the CPU 206.
  • the block diagram of the optical disk control device in the fourth embodiment is the same as the block diagram of the optical disk control device in the first embodiment shown in FIG. 1, and a description thereof will be omitted.
  • step S901 the acquired jitter value abnormality determination is performed (step S901). If the abnormality is determined (Yes in step S901), the process proceeds to step S902. If the determination is normal (No in step S901), the process proceeds to step S903. move on.
  • step S902 When the acquired jitter value is determined to be abnormal (Yes in step S901), the abnormal flag is turned on (step S902), the abnormal process is performed, and the jitter transfer circuit end interrupt process ends.
  • step S903 When the acquired jitter value is determined to be normal (No in step S901), the number of jitter normal acquired sectors is incremented by 1 (step S903).
  • the number of jitter normal acquisition sectors is used when determining the calculation range in the jitter calculation process in step S111 of the jitter measurement process in FIG.
  • the jitter value has been normally detected up to the number of sectors obtained by counting up the number of normally acquired jitter sectors in step S903 in FIG.
  • Cumulative addition processing is performed on the obtained jitter value of the sector (step S904).
  • the obtained cumulative addition result is stored in the buffer circuit 208 and used as an initial value of the cumulative addition process (step S904) in the jitter transfer circuit end interrupt process for the next sector.
  • the cumulative addition value is obtained.
  • the jitter value transfer number from the jitter value transfer number output unit 207a of the jitter transfer circuit 207 is Based on this, the jitter value acquisition process by the jitter detection circuit 208 and the jitter value calculation process by the notch calculation circuit 211 are executed in parallel. While acquiring the jitter value, cumulative addition processing is performed on the acquired jitter value as needed, reducing the processing load on the buffer data calculation circuit 212 performed in step S111 in FIG.
  • the jitter transfer circuit activation number is compared with the number of measured sectors (step S905), and the activation process is continued until the number of measurement sectors is activated.
  • step S905 If it is determined that the number of measurement sectors whose number of jitter transfer circuit activations is greater than the number of measurement sectors has been activated (No in step S905), only the end flag is turned on (step S906) and normal termination processing is performed.
  • step S905 If the jitter transfer circuit activation count is smaller than the measured sector count (Yes in step S905), the jitter / data transfer circuit 207 is activated (step S907), and the jitter transfer circuit activation count is set to +1. (Step S908), the continuous activation process is performed.
  • Arithmetic processing for the buffer data shown in Fig. 11 is also realized by a program, and is controlled by the CPU 2006. As shown below, since the cumulative addition processing is performed in step S904 of the jitter transfer circuit end interrupt processing of FIG. 10, the jitter measurement processing step S111 of FIG. The average jitter value can be calculated, that is, the processing time from the end of the jitter value transfer processing by the jitter / data transfer circuit 207 to the notification processing of the jitter value of the operation result can be shortened.
  • This embodiment is an effective method when there is a margin in the address interrupt processing and jitter transfer circuit end interrupt processing by the CPU 206, and it is necessary to increase the processing speed. For example, when playback is not being performed at high speed, jitter transfer is started at a certain address, jitter transfer end interrupt is performed, and this is effective when there is a time margin before the transfer starts at the next address. In
  • step S1001 the cumulative added value obtained in step S904 of the arithmetic processing for the buffer data in FIG. 9 is obtained from the buffer circuit 208 (step S1001).
  • the cumulative value of jitter values is divided by the cumulative number of times of addition, and the average value of the squared jitter values is obtained (step S1002).
  • the jitter value transfer number output unit 207a that outputs the jitter value transfer number by the jitter value transfer circuit 207 is provided, and the jitter value acquisition process and the buffer data calculation circuit 212 are provided. Jitter value calculation processing by the output of the jitter value transfer number output block 207a, and the jitter value transfer number, the calculation result for the jitter value obtained by executing in parallel is output. By performing the cumulative addition process at any time when it is transferred, the processing time can be increased.
  • optical disc control apparatus and optical disc control method that are effective in the present invention are one of the important technologies for realizing high-precision jitter measurement particularly at high double speeds, so that information recording using an optical disc is possible.

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  • Optical Recording Or Reproduction (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)

Abstract

Dans le cas d'une utilisation d'un dispositif externe pour mesurer l'instabilité de signaux reproduits dans un lecteur de disque optique, non seulement aucune mesure très précise ne peut être effectuée à cause de l'entrée de bruit mais un coût de préparation du dispositif de mesure est requis également. La présente invention fournit un circuit de détermination d'instabilité (211) qui détermine les instabilités de signaux d'informations reproduits à partir d'un disque optique ; un circuit tampon (208) qui mémorise des données d'instabilité ; et un circuit de réacheminement de données d'instabilité (207) qui réachemine une valeur d'instabilité déterminée par le circuit de détermination d'instabilité (211) au circuit tampon (208). Une UCT (206) est utilisée pour commander le circuit de détermination d'instabilité (211) et le circuit de réacheminement de données d'instabilité (207). Par conséquent, un système de mesure d'instabilité pour obtenir l'instabilité des signaux d'informations reproduits à partir du disque optique peut être réalisé dans le dispositif de commande de disque optique de sorte qu'aucun dispositif de mesure ne soit nécessaire et qu'une mesure d'instabilité précise sans aucune entrée de bruit puisse être réalisée.
PCT/JP2007/069072 2006-10-05 2007-09-28 Dispositif de commande de disque optique et procédé de commande de disque optique WO2008044503A1 (fr)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8411544B2 (en) 2009-04-02 2013-04-02 Panasonic Corporation Optical disc reproduction apparatus

Citations (5)

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Publication number Priority date Publication date Assignee Title
JP2000149282A (ja) * 1998-11-12 2000-05-30 Clarion Co Ltd フォーカスサーボ回路
JP2002074668A (ja) * 2000-08-31 2002-03-15 Matsushita Electric Ind Co Ltd 光ディスク記録再生装置
JP2002133685A (ja) * 2000-10-23 2002-05-10 Sony Computer Entertainment Inc 光学ピックアップの位置制御方法
JP2006120208A (ja) * 2004-10-20 2006-05-11 Hitachi Ltd 記録方法及び光ディスク装置
JP2006196099A (ja) * 2005-01-14 2006-07-27 Funai Electric Co Ltd ディスク装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000149282A (ja) * 1998-11-12 2000-05-30 Clarion Co Ltd フォーカスサーボ回路
JP2002074668A (ja) * 2000-08-31 2002-03-15 Matsushita Electric Ind Co Ltd 光ディスク記録再生装置
JP2002133685A (ja) * 2000-10-23 2002-05-10 Sony Computer Entertainment Inc 光学ピックアップの位置制御方法
JP2006120208A (ja) * 2004-10-20 2006-05-11 Hitachi Ltd 記録方法及び光ディスク装置
JP2006196099A (ja) * 2005-01-14 2006-07-27 Funai Electric Co Ltd ディスク装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8411544B2 (en) 2009-04-02 2013-04-02 Panasonic Corporation Optical disc reproduction apparatus

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