WO2004102540A1 - 情報再生装置および情報再生方法 - Google Patents
情報再生装置および情報再生方法 Download PDFInfo
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- WO2004102540A1 WO2004102540A1 PCT/JP2004/006914 JP2004006914W WO2004102540A1 WO 2004102540 A1 WO2004102540 A1 WO 2004102540A1 JP 2004006914 W JP2004006914 W JP 2004006914W WO 2004102540 A1 WO2004102540 A1 WO 2004102540A1
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- sag
- signal
- pickup
- cancel
- reproducing apparatus
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Classifications
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/10009—Improvement or modification of read or write signals
- G11B20/10046—Improvement or modification of read or write signals filtering or equalising, e.g. setting the tap weights of an FIR filter
- G11B20/10194—Improvement or modification of read or write signals filtering or equalising, e.g. setting the tap weights of an FIR filter using predistortion during writing
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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
- G11B7/005—Reproducing
Definitions
- the present invention relates to an information reproducing apparatus that improves the signal quality of reproduced data, and more particularly to an information reproducing apparatus that obtains a reproduced signal with little signal deterioration by correcting a transient of a signal extracted by a pickup. is there. Background art
- the sag cancellation for performing the transient correction of such a signal is a very effective means for improving the stability of the reproduced signal after passing through the defect.
- the transient correction is always performed on the signal extracted by the pickup, the reproduced signal quality of the defective portion is improved, but the signal other than the defective portion is also compressed.
- the signal jitter was likely to deteriorate.
- the present invention has been made in view of the above-mentioned problems, and provides an information reproducing apparatus that can improve the stability of a reproduced signal after passing through a defect and that has little quality deterioration even in a normal signal portion having no defect. Aim. Disclosure of the invention
- An information reproducing apparatus comprising: an information reproducing apparatus that reproduces information recorded on a medium; a pickup that extracts information recorded on the medium and outputs an extracted signal; A sag detection unit that detects a transient state of a signal output from the pickup and outputs the detection result as a transient state detection signal, and a sag cancel control unit that detects whether the signal output from the pickup is normal or abnormal.
- the transient correction of the signal output from the pickup is not performed. Of the signal output from the pickup based on the transient state detection signal.
- a sag cancel unit for performing transient correction.
- An information reproducing apparatus is an information reproducing apparatus for reproducing information recorded on a medium, wherein the pickup extracts information recorded on the medium and outputs an extracted signal.
- An AD converter for analog-to-digital conversion of a signal output from the pickup; and detecting a transient state of the digital signal output from the AD converter, and outputting the detection result as a transient state detection signal.
- a sag detection unit that detects whether the digital signal output from the AD conversion unit is normal or abnormal; and outputs a signal from the AD conversion unit during a period in which the sag cancellation control unit determines that the signal is normal.
- the sag cancellation control unit does not perform transient correction of the digital signal to be transmitted, and only performs the sag for a period during which the sag cancel control unit determines that there is an abnormality.
- a sag canceling unit for performing transient correction of the digital signal output from the AD conversion unit based on the transient state detection signal output from the detection unit.
- a sag detecting unit Since the sag cancel control unit and the sag cancel unit can be configured by digital circuits, a circuit configuration that is strong against process shrink can be obtained, and the sag detection unit, the sag cancel control unit, and the sag cancel unit are configured by analog circuits. Unlike this case, a capacitor and the like are not required, so that the circuit area can be reduced.
- An information reproducing apparatus for reproducing information recorded on a medium, comprising: a pickup for extracting information recorded on the medium and outputting an extracted signal; An AD converter for analog-to-digital conversion of a signal output from the pickup; and a sag detection for detecting a transient state of the signal output from the pickup and outputting the detection result as a transient state detection signal.
- a sag cancel cell controller for detecting whether the digital signal output from the AD converter is normal or abnormal; and a digital signal output from the AD converter for a period when the sag cancel controller determines that the signal is normal.
- the sag detection is performed only during the period in which the sag cancel control unit determines that there is an abnormality without performing the transient correction of Is characterized in that on the basis of the transient state detection signal output and a sag cancellation unit that performs transient correction of the digital signal output from the AD conversion unit from.
- the sag cancellation control unit and the sag cancellation unit can be configured by a digital circuit while maintaining the response performance of the sag detection unit.
- a strong circuit configuration can be obtained, and unlike the case where the sag cancellation control unit and the sag cancellation unit are configured by analog circuits, capacitors and the like are not required, so that the circuit area can be reduced.
- An information reproducing apparatus is an information reproducing apparatus for reproducing information recorded on a medium, wherein the pickup for extracting information recorded on the medium and outputting an extracted signal is provided.
- An AD converter for analog-to-digital conversion of a signal output from the pickup; and detecting a transient state of the digital signal output from the AD converter, and outputting the detection result as a transient state detection signal.
- Sag detection unit that performs normal / abnormal signal output from the pickup During the period in which the sag cancel control unit determines that the signal is normal, the transient correction of the digital signal output from the AD conversion unit is not performed, and the sag cancel control unit is determined to be abnormal.
- a sag canceling unit that performs transient correction of a digital signal output from the AD conversion unit based on a transient state detection signal output from the sag detection unit only during a period for determination.
- the sag detecting unit and the sag canceling unit can be configured by the digital circuit while maintaining the response performance of the sag canceling control unit.
- a capacitor and the like are not required, so that the circuit area can be reduced.
- An information reproducing apparatus for reproducing information recorded on a medium, comprising: a pickup for extracting information recorded on the medium and outputting an extracted signal; An analog-to-digital (A / D) converter that converts the signal output from the pickup into an analog signal; a sag that detects a transient state of the signal output from the pickup and outputs the detection result as a transient state detection signal A detector, a sag cancel cell controller for detecting normality / abnormality of a signal output from the pickup, and a transient correction of a digital signal output from the AD converter for a period in which the sag cancel controller determines that the signal is normal.
- a detector a sag cancel cell controller for detecting normality / abnormality of a signal output from the pickup, and a transient correction of a digital signal output from the AD converter for a period in which the sag cancel controller determines that the signal is normal.
- the sag detection unit Is not performed, and only during the period in which the sag cancellation control unit determines that there is an abnormality, the sag detection unit Is characterized in that on the basis of the transient state detection signal al outputted and a sag cancellation unit that performs transient correction of the digital signal output from the AD conversion unit.
- the sag canceling section can be configured by a digital circuit while maintaining the response performance of the sag detecting section and the sag canceling control section.
- a circuit configuration can be obtained, and unlike the case where the sag cancel unit is configured by an analog circuit, a capacitor or the like is not required, so that the circuit area can be reduced.
- the sag cancellation control unit may be configured to control a signal output from the pickup based on defect information detected from a signal output from the pickup. It is characterized by judging normal and abnormal.
- the information reproducing apparatus wherein the sag cancellation control unit outputs the signal from the pickup based on detrack detection information indicating that the pickup is in a detrack state. It is characterized by judging the normality / abnormality of the signal received.
- the sag cancellation control unit is configured to detect, based on detrack detection information indicating that the pickup is in a detrack state, and a signal output from the pickup. It is characterized in that the normality / abnormality of the signal extracted by the pickup is determined based on the detected defect information.
- the sag cancellation control unit further extends a defect period indicated by the defect information for a predetermined period, and sets the extended period to the pick-up. It is characterized in that it is determined that the signal extracted in the period is abnormal.
- the sag cancel cell control unit is configured to determine whether a signal output from the pickup is normal based on amplitude information of a signal output from the pickup. ⁇ It is characterized by judging abnormalities.
- the information reproducing apparatus further comprises: a PLL for causing a binarized signal of a signal output from the sag canceling section to follow a reference frequency; Is characterized by judging whether the signal extracted by the pickup is normal or abnormal based on state information output from the PLL.
- a transient state of a signal from the disk is detected, and the result of the transient is detected.
- a sensor that outputs a status detection signal In the sag cancellation step, a sag cancel control step for detecting normality / abnormality of the signal from the disk, and during the period in which the sag cancel control step determines that the signal is normal, the transient correction of the signal from the disk is not performed.
- FIG. 1 is a block diagram showing an example of a configuration of an information reproducing apparatus according to Embodiment 1 of the present invention.
- FIG. 2 is an explanatory diagram for explaining an operation of a sag detection unit of the information reproducing device according to the first embodiment of the present invention.
- FIG. 3 is an explanatory diagram for explaining an operation of a sag cancel control section of the information reproducing apparatus according to the first embodiment of the present invention.
- FIG. 4 is an explanatory diagram for explaining an operation of a sag cancel unit of the information reproducing device according to the first embodiment of the present invention.
- FIG. 5 is an explanatory diagram for explaining another operation example of the sag cancellation control unit of the information reproducing device according to the first embodiment of the present invention.
- FIG. 6 is a block diagram showing an example of a configuration of an information reproducing apparatus according to Embodiment 2 of the present invention.
- FIG. 7 is a block diagram showing an example of a configuration of an information reproducing apparatus according to Embodiment 3 of the present invention.
- FIG. 8 is a block diagram showing an example of a configuration of an information reproducing apparatus according to Embodiment 4 of the present invention.
- FIG. 9 is a block diagram showing an example of a configuration of an information reproducing apparatus according to Embodiment 5 of the present invention.
- FIG. 10 is a block diagram showing an example of a configuration of an information reproducing apparatus according to Embodiment 6 of the present invention.
- FIG. 11 is an explanatory diagram for explaining an operation of a sag cancel cell control unit of an information reproducing apparatus according to Embodiment 6 of the present invention.
- FIG. 12 is a block diagram showing an example of a configuration of an information reproducing apparatus according to Embodiment 7 of the present invention.
- FIG. 13 is an explanatory diagram for explaining an operation of a sag cancel cell control unit of the information reproducing apparatus according to the seventh embodiment of the present invention.
- FIG. 1 is a block diagram showing an example of a configuration of an information reproducing apparatus according to Embodiment 1 of the present invention.
- the information reproducing apparatus includes a pickup 101, a sag detecting section 102, a sag canceling control section 103, and a sag canceling section 104.
- the sag detection unit 102, the sag cancellation control unit 103, and the sag cancellation unit 104 are configured by analog circuits.
- the pickup 101 extracts information recorded on the medium, and outputs the extracted signal S101 to the sag detecting unit 102, the sag cancelling control unit 103, and the sag canceling unit 104, respectively.
- the sag detecting section 102 detects the transient state of the pickup output signal S101, and here, the sag is calculated from the midpoint between the peak envelope and the bottom envelope of the pickup output signal S101.
- the obtained sag is output to the sag cancel unit 104 as a transient state detection signal S102.
- the sag cancel control section 103 detects whether the pickup output signal S101 is normal or abnormal.Here, after detecting the defect information from the pickup output signal S101, the defective section is abnormally detected. Signals other than defective parts are judged as normal signals, and
- the backup output signal S101 is output to the sag cancel section 104 as a sag cancel control signal S103 indicating normal / abnormal.
- the sag cancel unit 104 determines whether to perform transient correction of the pickup output signal S101 based on the sag cancel control signal S103 output from the sag cancel control unit 103. Transient correction is performed only for signals requiring transient correction. Specifically, during the period when the sag cancel control unit 103 determines that the signal is normal, the transient of the pickup output signal S101 is performed. Only when the sag cancel control unit 103 determines that there is an abnormality without performing the transient correction, the pickup output signal S based on the transient state detection signal S102 detected by the sag detection unit 102. Transient correction of 101 is performed, and the generated signal is output as a reproduced signal S104.
- FIG. 2 is an explanatory diagram for explaining the operation of the sag detection unit 102.
- a pickup output signal S101 output from the pickup 101 and a transient state detection signal S102 output from the sag detection unit 102 are shown from above.
- the sag detector 102 When the pickup output signal S101 is input to the sag detector 102, the sag detector 102 first detects the peak envelope and the potto envelope of the pickup output signal S101 (see FIG. 2). (Dashed line) and (peak envelope + bottom envelope) Z2 is calculated to calculate the midpoint between the peak envelope and the bottom envelope.
- the sag detection section 102 outputs the sag obtained from the midpoint between the peak envelope and the bottom envelope to the sag cancel cell section 104 as a transient state detection signal S102.
- FIG. 3 is an explanatory diagram for explaining the operation of the sag cancel control unit 103.
- the pickup output signal S101 output from the pickup 101, the defect information detected by the sag cancel control section 103, 3 shows a sag cancel control signal S 103 output from the cancel control unit 103.
- the sag cancellation control unit 103 When the pickup output signal S101 is input to the sag cancellation control unit 103, the sag cancellation control unit 103 first detects defect information.
- the sag cancel control unit 103 compares the pickup output signal S101 with the slice level for defect detection, and determines that the signal level is higher than the slice level for defect detection. If it appears on the dark side, the signal may be detected as defect information.
- the center level of the pickup output signal S101 is set as a slice level for defect detection, and the peak envelope of the pickup output signal S101 is darker than the slice level for defect detection. When it appears, it is detected as defect information.
- the sag cancellation control unit 103 determines that a period in which a defect is detected is an abnormal signal and a period in which no defect is detected is a normal signal.
- the sag cancel control signal S 103 shown in FIG. 3 is output to the sag cancel unit 104.
- FIG. 4 is an explanatory diagram for explaining the operation of the sag cancel unit 104.
- the pickup output signal S101 output from the pickup 101, the transient state detection signal S102 output from the sag detection unit 102, and the sag cancellation control unit 10 3 shows a sag cancellation control signal S 103 output from the SAG 3 and a reproduced signal S 104 output from the sag cancellation unit 104.
- the sag cancel unit 104 determines whether to perform transient correction of the pickup output signal S 101 based on the sag cancel control signal S 103 output from the sag cancel control unit 103. I do.
- the transient correction is not performed during the period when the sag cancel control signal S103 indicates normal, and the transient correction is performed only during the period when the sag cancel control signal S103 indicates abnormal. .
- the sag cancel section 104 confirms that the sag cancel control signal S 103 is normal. During this period, the pickup output signal S101 is output as is as the playback signal S104, and signal quality deterioration due to transient correction performed on normal signal parts is prevented. I do.
- the sag cancel section 104 performs transient correction of the pickup output signal S 101 during a period indicating that the sag cancel control signal S 103 is abnormal, and outputs the corrected signal.
- a reproduction signal S 104 As a reproduction signal S 104.
- the transient correction of the pickup output signal S101 by the sag cancel section 104 is performed so that the transient state detection signal S102 detected by the sag detection section 102 approaches the center level of the signal. This is performed by correcting the pickup output signal S101.
- the sag cancel control unit 103 detects whether the pickup output signal S 101 is normal or abnormal based on the defect information, and outputs the pickup output.
- the signal quality can be improved by performing transient correction on the normal signal unit. Deterioration can be prevented, and appropriate transient correction can be performed for an abnormal signal portion, and a stable reproduced signal S 104 can be obtained from the sag cancel portion 104.
- the sag detecting section 102 detects the midpoint between the peak envelope and the bottom envelope, and the sag canceling section 104 detects the detected sag detecting section 1.
- the transient correction of the pickup output signal S101 is performed such that the center point of the peak envelope and the bottom envelope approaches the center level of the pickup output signal S101.
- 102 detects only the peak envelope or the bottom envelope, and the sag cancel section 104 converts the detected peak envelope or the bottom envelope close to the center level of the pickup output signal S101.
- the sag detection unit 102 Up output signal S 1 0 1 detects the DC component of (RF signal), sag cancellation section 1 0 4, the pickup output signal S the detected Transient correction of the pickup output signal S 101 may be performed so that the integrated level of the DC component of 101 approaches zero.
- the sag cancellation control unit 103 of the information reproducing apparatus uses a predetermined defect detection slice level as a defect information detection method, and generates a pickup output signal S 101
- the envelope is detected as the defect information when the signal level is darker than the slice level for defect detection.However, any other method for detecting the defect information may be used.
- the defect information detected as shown in FIG. 3 is extended for a predetermined period of time so as to extend the period in which the sag cancel control signal S 103 is determined to be abnormal. May be extended by the predetermined period to compensate for an error due to a response delay of the sag cancellation control unit 103.
- the sag cancel control unit 103 detects the output amplitude information of the signal output from the pickup 101, and determines a portion where the output amplitude is smaller than a predetermined amplitude as an abnormal signal and a portion other than the abnormal signal as an abnormal signal. It may be determined that the signal is normal and output to the sag cancel unit 104 as a sag cancel control signal S103 indicating the normality / abnormality of the pickup output signal S101.
- FIG. 6 is a block diagram showing an example of a configuration of an information reproducing apparatus according to Embodiment 2 of the present invention.
- the information reproducing apparatus includes a pick-up 201, a sag detecting section 202, a sag cancel control section 203, and a sag canceling section 204. , And an AD conversion section 205.
- the sag detecting section 202, the sag cancel control section 203, and the sag cancelling section 204 are constituted by digital circuits.
- the pickup 201 extracts information recorded on the medium, and outputs the extracted signal S201 to the AD conversion unit 205.
- the AD converter 205 converts the pickup output signal S201 into digital form,
- the digital output signal S 205 which is the picked-up output signal, is output to the sag detector 202, the sag cancel controller 203, and the sag canceller 204, respectively.
- the sag detecting section 202 detects the transient state of the digital output signal S 205 and outputs the detected transient state to the sag canceling section 204 as a transient state detection signal S 202.
- the sag cancel control section 203 detects whether the digital output signal S 205 is normal or abnormal, and outputs the sag cancel control signal S 203 indicating the normal or abnormal digital output signal S 205 to the sag cancel cell section 203. Output to 4.
- the sag cancellation unit 204 operates during the period when the digital output signal S 205 is normal.
- the transient state detection signal S 2 output from the sag detection section only during the period when the digital output signal S 205 is abnormal without performing the digital end signal S 205 on the digital output signal S 205 Based on O2, transient correction of the digital output signal S205 output from the AD converter 205 is performed, and the generated signal is output as a reproduction signal S204.
- the input signals of the sag detecting section 202, the sag cancel controlling section 203, and the sag canceling section 204 are output from the pickup 201.
- the difference from the information reproducing apparatus according to the first embodiment is that the pick-up output signal S 201 is not the pick-up output signal S 201 but the signal S 205 after AD conversion of the pick-up output signal S 201.
- the basic operations of the unit 202, the sag cancel control unit 203, and the sag cancel unit 204 are the same as those described in the first embodiment.
- the AD converter 205 for AD-converting the pickup output signal S 201 from the pickup 201 is provided, and the sag detection is performed.
- the circuit 202, the sag cancel control unit 203, and the sag canceling unit 204 are constituted by digital circuits, so that a circuit structure that is strong in process shrink can be obtained, and the sag detecting unit 202, Unlike the case where the sag cancel control section 203 and the sag cancel section 204 are configured by analog circuits, Since a capacitor or the like becomes unnecessary, the circuit area can be reduced.
- FIG. 7 is a block diagram showing an example of a configuration of an information reproducing apparatus according to Embodiment 3 of the present invention.
- the information reproducing apparatus includes a pick-up 301, a sag detecting unit 302, a sag cancel control unit 303, and a sag canceling unit 304. , And an AD converter 305.
- the sag detection section 302 is an analog circuit
- the sag cancellation control section 303 and the sag cancellation section 304 are digital circuits.
- the pickup 301 extracts information recorded on the medium, and outputs the extracted signal S301 to the sag detector 302 and the AD converter 305, respectively.
- the AD converter 305 converts the pickup output signal S301 into a digital form and converts the digital output signal S305, which is a digitized pickup output signal, into a sag cancel control section 303 and a sag cancel section 300. Output to 4 respectively.
- the sag detecting section 302 detects the transient state of the pickup output signal S301, and outputs the detected transient state to the sag canceling section 304 as a transient state detection signal S302.
- the sag cancel control section 303 detects whether the digital output signal S305 is normal or abnormal, and outputs the sag cancel control signal S303 indicating the normal or abnormal digital output signal S305 to the sag cancel section 3. 0 Output to 4.
- the sag cancel section 304 Based on the sag cancel control signal S 303 output from the sag cancel control section 303, the sag cancel section 304 operates during the period in which the digital output signal S 305 is normal.
- the transient state detection signal S 3 output from the sag detector only during the period when the digital output signal S 3 05 is abnormal without performing the transient correction of the digital output signal S 3 05 Based on 02, the digital output signal S305 output from the AD conversion section 305 is subjected to transient correction, and the generated signal is output as a reproduced signal S304.
- the information reproducing apparatus is characterized in that the input signals of the sag cancel control section 303 and the sag cancel section 304 are output from the pickup 301.
- the difference from the information reproducing apparatus according to the first embodiment is that the pickup output signal S 305 is not the pickup output signal S 301 but the signal S 305 after AD conversion of the pickup output ′ signal S 301.
- the basic operations of the detection unit 302, the sag cancel control unit 303, and the sag cancel unit 304 are the same as those described in the first embodiment.
- the AD converter 305 for AD-converting the pickup output signal S 301 from the pickup 301 is provided, and the sag cancellation is performed. Since the control unit 303 and the sag cancel unit 304 are configured by digital circuits, the sag cancel control unit 303 configured by a digital circuit is maintained while maintaining the response performance of the sag detection unit 302. , And the sag cancel unit 304 can obtain a circuit configuration that is strong against process shrink. Further, unlike the case where the sag cancellation control section 303 and the sag cancellation section 304 are configured by analog circuits, a capacitor or the like is not required, so that the circuit area can be reduced.
- FIG. 8 is a block diagram showing an example of a configuration of an information reproducing apparatus according to Embodiment 4 of the present invention.
- the information reproducing apparatus includes a pick-up 401, a sag detecting section 402, a sag cancel control section 400, and a sag canceling section 404.
- the sag cancel controller 403 is an analog circuit
- the sag detector 402 and the sag canceler 404 are digital circuits.
- the pickup 401 extracts information recorded on the medium, and outputs the extracted signal S401 to the sag canceller controller 403 and the AD converter 405, respectively.
- the AD converter 405 AD-converts the pickup output signal S401 and converts the digital output signal S405, which is a digitalized pickup output signal, to the sag detector 402 and the sag canceller 404. Output each.
- the sag detection section 402 detects the transient state of the digital output signal S405, and uses the detected transient state as the transient state detection signal S402. Output to sag cancel section 404.
- the sag cancel control section 403 detects whether the pickup output signal S 401 is normal or abnormal, and outputs the sag cancel control signal S 403 indicating the normal or abnormal pickup output signal S 401 to the sag cancel section. Output to 404.
- the sag cancel section 404 operates during the period when the digital output signal S 405 is normal.
- transient correction of the digital output signal S405 output from the AD conversion section 405 is performed, and the generated signal is output as a reproduction signal S404.
- the input signal of the sag detecting section 402 and the input signal of the sag canceling section 404 is a pickup output signal S 410 output from the pickup 401.
- the difference from the information reproducing apparatus according to the first embodiment is that the pickup output signal S 405 is a signal S 405 after AD conversion of the pickup output signal S 401, but a sag detection unit 402 and a sag cancel control unit
- the basic operation of 403 and the sag cancel unit 404 is the same as that described in the first embodiment.
- the AD converter 405 for AD converting the pickup output signal S 401 from the pickup 401 is provided, and the sag detection is performed.
- the sag detection unit 404 and the sag cancel cell unit 404 are constituted by digital circuits, so that the response performance of the sag cancel control unit 403 constituted by an analog circuit is maintained while the sag detection constituted by a digital circuit is maintained.
- the circuit section 402 and the sag cancel section 404 can obtain a circuit configuration that is strong in process shrinking. Further, unlike the case where the sag detecting section 402 and the sag canceling section 404 are constituted by analog circuits, capacitors and the like are not required, so that the circuit area can be reduced.
- FIG. 9 is a block diagram showing an example of a configuration of an information reproducing apparatus according to Embodiment 5 of the present invention.
- the information reproducing apparatus according to the fifth embodiment of the present invention includes a pick-up 501, a sag detecting section 502, a sag cancel control section 503, and a sag canceling section 504. , And an AD conversion section 505.
- the sag detection section 502 and the sag cancel control section 503 are constituted by analog circuits
- the sag cancel section 504 is constituted by a digital circuit.
- the pickup 501 extracts information recorded on the medium, and outputs the extracted signal S501 to the sag detecting section 502, the sag cancelling control section 503, and the AD converting section 505, respectively.
- the AD converter 505 performs AD conversion on the pickup output signal S501 and outputs a digital output signal S505, which is a digitized pickup output signal, to the sag canceler 504.
- the sag detection section 502 detects the transient state of the pickup output signal S501, and outputs the detected transient state to the sag cancel section 504 as a transient state detection signal S502.
- the sag cancel control section 503 detects whether the pickup output signal S501 is normal or abnormal, and outputs the sag cancel control signal S503 indicating the normal or abnormal pickup output signal S501 to the sag cancel section. Output to 504.
- the sag cancel section 504 controls the AD converter section 5 during the period when the digital output signal S505 is normal.
- the transient state detection signal S 5 output from the sag detection unit only during the period when the digital output signal S 505 is abnormal without performing the transient correction of the digital output signal S 505 output from the sigma 05
- transient correction of the digital output signal S505 output from the AD conversion unit 505 is performed, and the generated signal is output as a reproduction signal S504.
- the input signal of the sag cancel unit 504 is not the pickup output signal S501 output from the pickup 501, but the pickup output signal S504. 1 is different from the information reproducing apparatus according to the first embodiment in that it is the signal S505 after AD conversion, but the sag detecting section 502, the sag cancel control section 503, and the sag cancel section 50
- the basic operation of 4 is This is the same as that described in the first embodiment.
- the AD converter 505 for AD converting the pickup output signal S501 from the pickup 501 is provided, and the sag cancellation is performed.
- the unit 504 is constituted by a digital circuit
- the sag canceling unit 5 constituted by a digital circuit is maintained while maintaining the response performance of the sag detecting unit 502 and the sag cancelling control unit 503 constituted by an analog circuit.
- a circuit configuration that is strong against process shrink can be obtained.
- a capacitor or the like is not required, so that the circuit area can be reduced.
- the sag cancellation control section has a pickup in a detrack state. A method for detecting whether the pickup output signal is normal or abnormal based on the detrack detection signal indicating the above will be described.
- FIG. 10 is a block diagram showing an example of a configuration of an information reproducing apparatus according to Embodiment 6 of the present invention.
- the information reproducing apparatus includes a pickup 101, a sag detecting section 102, a sag cancelling control section 603, and a sag canceling section 104.
- the same components as those of the information reproducing apparatus according to the first embodiment of the present invention are denoted by the same reference numerals, and description thereof will not be repeated.
- the sag cancel control section 603 detects whether the pickup output signal S 101 is normal or abnormal.Here, the detrack detection detected by the pickup drive section 605 controlling the pickup 101 is performed. Based on the signal S 605, the detrack portion is determined to be an abnormal signal, and the portions other than the detrack portion are determined to be normal signals, and the pickup output signal S 101 is determined to be normal or abnormal. Output to the sag cancel section 104 as 03.
- the pickup drive section 605 provided in the pickup 101 controls the drive of the pickup 101 and also sets the pickup in a detrack state. Is detected, and the detected detrack detection information is output to the sag cancellation control unit 603 as a detrack detection signal S605.
- FIG. 11 is an explanatory diagram for explaining the operation of the sag cancellation control unit 603.
- the pickup output signal S 101 output from the pickup 101, the detrack detection signal S 605 output from the pickup drive section 65, and the sag cancel control section 6 Indicates the sag cancel control signal S603 output from 03.
- the sag cancel controller 603 Upon receiving the detrack detection signal S 605 indicating that the pickup is in the detrack state from the pickup driver 605 controlling the pickup drive, the sag cancel controller 603 receives the detrack detection signal. Based on S 605, the detrack portion is determined to be an abnormal signal, and other than the detrack portion is determined to be a normal signal, and a sag cancel cell control signal S 603 shown in FIG. . Thereafter, as described in the first embodiment, the sag cancel unit 104 selects the pickup output signal S 10 0 based on the sag cancel control signal S 603 output from the sag cancel control unit 63. Decide whether to perform transient correction in step 1 or not, and perform transient correction only for signals that require transient correction.
- the sag cancel controller 603 detects the normality / abnormality of the pickup output signal S101 by the pickup drive unit 605. Normally, the sag cancel section 104 performs transient correction only during the period in which the pickup output signal S101 is detected as abnormal, based on the detrack detection signal S605 Deterioration of signal quality due to transient correction for unusual signal sections can be prevented, and appropriate transient correction can be performed for abnormal signal sections, enabling stable playback from the sag cancel section 104 It becomes possible to obtain the signal S604.
- the sag cancel control signal S603 may be generated.
- the sag cancellation control unit 603 indicates that the pickup 101 is in the detrack state.
- the processing by the sag cancellation control unit 603 described in the sixth embodiment is described in the embodiment of the present invention. The same may be applied to the information reproducing apparatus described in 2 to 5.
- a sag cancellation control unit is output from a PLL.
- a method for detecting a normal or abnormal pick-up output signal based on a PLL state signal will be described.
- FIG. 12 is a block diagram showing an example of a configuration of an information reproducing apparatus according to Embodiment 7 of the present invention.
- the information reproducing apparatus comprises a pickup 101, a sag detecting section 102, a sag cancel control section 703, a sag cancel cell section 104, and a PLL 705.
- the same reference numerals are given to the same signals and components as those in the information reproducing apparatus according to the first embodiment of the present invention, and description thereof will be omitted. .
- the PLL 705 performs a PLL process for causing the binary signal of the reproduced signal S 704 output from the sag cancel unit 104 to follow a reference frequency.
- the state information indicating the tracking state is output to the sag cancellation control section 703 as the PLL state signal S705.
- the signal that indicates the state of phase following as the state signal S705 is output.
- the state signal S705 it is also possible to use a signal indicating a state of frequency following, a state indicating both frequency following and phase following, and the like.
- the sag cancellation control section 703 detects whether the pickup output signal S 101 is normal or abnormal, and here, based on the PLL state signal S 705 output from the PLL 705.
- the phase tracking NG period is judged as an abnormal signal and the phase tracking OK period is judged as a normal signal, and the sag cancel unit 1 as the sag cancel control signal S 703 indicating the normal / abnormal pickup output signal S 101 0 Output to 4.
- the operation of the sag cancellation control unit 703 will be described.
- FIG. 13 is an explanatory diagram for explaining the operation of the sag cancellation control unit 703.
- the pickup output signal S 101 output from the pickup 101, the PLL state signal S 705 output from the PLL 705, and the sag cancel control unit 703 from the top Indicates the output sag cancel control signal S703.
- the sag cancellation control section 703 Upon receiving the PLL state signal S705 output from the PLL 705, the sag cancellation control section 703 sets an abnormal phase tracking NG period based on the state signal S706. The period of the signal and the phase tracking ⁇ K is determined to be a normal signal, and the sag cancellation control signal S 703 shown in FIG. Thereafter, as described in the first embodiment, the sag cancel unit 104 picks up the pickup output signal S 100 based on the sag cancel control signal S 703 output from the sag cancel control unit 703. Determine whether or not to perform transient correction in step 1, and perform transient correction only for signals that require transient correction.
- the sag cancel control unit 703 determines whether the pickup output signal S 101 is normal or abnormal, based on the PLL output from the PLL 705.
- a normal signal section is detected based on the state signal S705, and the transient correction is performed by the sag canceling section 104 only during a period in which the pickup output signal S101 is detected as abnormal. It is possible to prevent signal quality degradation due to transient correction In both cases, appropriate transient correction can be performed for an abnormal signal portion, and a stable reproduced signal S704 can be obtained from the sag cancel portion 104.
- the sag cancel control unit 703 performs pickup based on the state signal of the PLL output from the PLL.
- the processing by the sag cancel cell control unit 703 described in the seventh embodiment is performed by the information reproduction described in the second embodiment 5 of the present invention. The same may be applied to the device.
- the transition end correction is performed only during the period in which the pickup output signal is abnormal, it is possible to reduce the deterioration of the quality of the reproduction signal in the normal signal portion and obtain a stable reproduction signal.
Abstract
Description
Claims
Priority Applications (2)
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US10/530,276 US7428195B2 (en) | 2003-05-14 | 2004-05-14 | Information reproduction apparatus and information reproduction method |
JP2005506276A JPWO2004102540A1 (ja) | 2003-05-14 | 2004-05-14 | 情報再生装置および情報再生方法 |
Applications Claiming Priority (2)
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JP2003-135804 | 2003-05-14 | ||
JP2003135804 | 2003-05-14 |
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WO2004102540A1 true WO2004102540A1 (ja) | 2004-11-25 |
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PCT/JP2004/006914 WO2004102540A1 (ja) | 2003-05-14 | 2004-05-14 | 情報再生装置および情報再生方法 |
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US (1) | US7428195B2 (ja) |
JP (1) | JPWO2004102540A1 (ja) |
CN (1) | CN100347765C (ja) |
WO (1) | WO2004102540A1 (ja) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6013362A (ja) * | 1983-06-30 | 1985-01-23 | Matsushita Electric Ind Co Ltd | オ−トスライス回路 |
JP2001229617A (ja) * | 2000-02-16 | 2001-08-24 | Mitsubishi Electric Corp | 光ディスク用信号検出回路 |
JP2002319239A (ja) * | 2001-04-20 | 2002-10-31 | Matsushita Electric Ind Co Ltd | 情報再生装置 |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5497361A (en) * | 1992-03-13 | 1996-03-05 | Hitachi, Ltd. | Information reproducing apparatus with a DC level correcting capability |
US5570335A (en) * | 1994-05-23 | 1996-10-29 | Olympus Optical Co., Ltd. | Reproducing waveform correction circuit for optical information recording/reproducing system |
JPH10106160A (ja) | 1996-09-30 | 1998-04-24 | Sanyo Electric Co Ltd | 光ディスク用の信号再生回路 |
JP3042458B2 (ja) * | 1997-08-25 | 2000-05-15 | 日本電気株式会社 | 情報記録再生装置及び情報記録再生方法 |
JPH11195271A (ja) | 1997-12-26 | 1999-07-21 | Sony Corp | 信号処理装置 |
TW513854B (en) * | 2000-11-21 | 2002-12-11 | Via Tech Inc | Defect protection circuit and method of disk data slicer |
-
2004
- 2004-05-14 WO PCT/JP2004/006914 patent/WO2004102540A1/ja active Application Filing
- 2004-05-14 JP JP2005506276A patent/JPWO2004102540A1/ja not_active Withdrawn
- 2004-05-14 CN CNB2004800008525A patent/CN100347765C/zh not_active Expired - Fee Related
- 2004-05-14 US US10/530,276 patent/US7428195B2/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6013362A (ja) * | 1983-06-30 | 1985-01-23 | Matsushita Electric Ind Co Ltd | オ−トスライス回路 |
JP2001229617A (ja) * | 2000-02-16 | 2001-08-24 | Mitsubishi Electric Corp | 光ディスク用信号検出回路 |
JP2002319239A (ja) * | 2001-04-20 | 2002-10-31 | Matsushita Electric Ind Co Ltd | 情報再生装置 |
Also Published As
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CN1701357A (zh) | 2005-11-23 |
US20060062118A1 (en) | 2006-03-23 |
JPWO2004102540A1 (ja) | 2006-07-13 |
CN100347765C (zh) | 2007-11-07 |
US7428195B2 (en) | 2008-09-23 |
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