WO2001073785A1 - Dispositif de reproduction de donnees - Google Patents
Dispositif de reproduction de donnees Download PDFInfo
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- WO2001073785A1 WO2001073785A1 PCT/JP2001/002456 JP0102456W WO0173785A1 WO 2001073785 A1 WO2001073785 A1 WO 2001073785A1 JP 0102456 W JP0102456 W JP 0102456W WO 0173785 A1 WO0173785 A1 WO 0173785A1
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- data
- recording medium
- synchronization
- signal
- reproduced
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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
- G11B20/14—Digital recording or reproducing using self-clocking codes
-
- 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
-
- 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
- G11B20/10222—Improvement or modification of read or write signals clock-related aspects, e.g. phase or frequency adjustment or bit synchronisation
-
- 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
- G11B20/14—Digital recording or reproducing using self-clocking codes
- G11B20/1403—Digital recording or reproducing using self-clocking codes characterised by the use of two levels
-
- 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
- G11B20/18—Error detection or correction; Testing, e.g. of drop-outs
-
- 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
- G11B20/18—Error detection or correction; Testing, e.g. of drop-outs
- G11B20/1803—Error detection or correction; Testing, e.g. of drop-outs by redundancy in data representation
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
- G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
- G11B27/19—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
- G11B27/10—Indexing; Addressing; Timing or synchronising; Measuring tape travel
- G11B27/19—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier
- G11B27/28—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording
- G11B27/30—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording on the same track as the main recording
- G11B27/3027—Indexing; Addressing; Timing or synchronising; Measuring tape travel by using information detectable on the record carrier by using information signals recorded by the same method as the main recording on the same track as the main recording used signal is digitally coded
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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
- G11B2020/10916—Seeking data on the record carrier for preparing an access to a specific address
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B2220/00—Record carriers by type
- G11B2220/20—Disc-shaped record carriers
- G11B2220/21—Disc-shaped record carriers characterised in that the disc is of read-only, rewritable, or recordable type
- G11B2220/215—Recordable discs
- G11B2220/216—Rewritable discs
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B2220/00—Record carriers by type
- G11B2220/20—Disc-shaped record carriers
- G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
- G11B2220/2537—Optical discs
- G11B2220/2562—DVDs [digital versatile discs]; Digital video discs; MMCDs; HDCDs
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B2220/00—Record carriers by type
- G11B2220/20—Disc-shaped record carriers
- G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
- G11B2220/2537—Optical discs
- G11B2220/2562—DVDs [digital versatile discs]; Digital video discs; MMCDs; HDCDs
- G11B2220/2575—DVD-RAMs
Definitions
- the present invention relates to a data reproducing apparatus for reading a signal recorded on a recording medium and outputting error-corrected data.
- a receiving device for data transmission for example, a device for reproducing data from a recording medium such as an optical disk or a magnetic disk, an input data stream supplied from a transmission path or input data obtained by reproducing a recording medium is converted into an input data sequence.
- a so-called synchronization pull-in is performed by detecting a periodically inserted synchronization pattern, and a clock is reproduced from input data, and data is reproduced using this clock.
- a PLL Phase Locked Loop
- the phase difference between the output (clock) of a so-called local oscillator and the input data is detected, and the local loop is detected by a feedback loop.
- the clock is reproduced by controlling so that the frequency and phase of the transmitter match the frequency and phase of the input data.
- a clock is used for the above-described synchronization pull-in.
- the position of the synchronization pattern to be detected is predicted from the detection position of the immediately preceding synchronization pattern, and a pseudo synchronization detection signal is placed at this predicted position.
- the internal processing for insertion is known.
- a position on the input data string where the next synchronization pattern is inserted is predicted based on the interval of the synchronization pattern, and a window having a predetermined width is placed at that position.
- a window processing for detecting a synchronization pattern from an input data string in this window is known.
- the operations of data reproduction from a recording medium and window processing will be described in further detail.
- the reproducing apparatus performs the synchronization of the preset synchronization pattern. Based on the insertion cycle 402, the data on the reproduction data stream 400 is counted, and the next synchronization pattern 401b is detected.
- the synchronization pattern 401b can be detected by counting the input period 402, but actually the reproduction data In column 400, data loss, errors in the synchronization pattern, or errors in the data sequence occur on the transmission line.Therefore, it is not possible to detect the synchronization pattern only by strict counting of the insertion period. Have difficulty.
- a predetermined width width 404b ahead, A window 404 having a width 404 a
- a synchronization pattern 401b is detected from the window 404.
- the synchronization pattern 401b can be detected by searching the window 404.
- error correction means for decoding an error correction code capable of correcting data errors is used in various data reproducing devices.
- the error probability of data read from a recording medium has increased due to high-density recording on a recording medium and an increase in data transfer speed to a data processing device.
- the error correction means a plurality of codes having high error correction capability are added, or iterative decoding for repeatedly decoding a plurality of error correction codes is performed.
- iterative decoding which is a decoding operation in which a plurality of (two or more) correction processes each using an error correction code are combined in a predetermined order, is performed on a positive code.
- D VD-ROM and D VD-RAM also perform iterative decoding on product codes.
- DVD-ROM employs an iterative correction algorithm of a specific number of times and in a specific order so that error correction processing is completed within a predetermined time.
- the PLL when the recording medium is reproduced, the PLL is temporarily unlocked due to a seek or detection of a differential (scratch or dirt) on the medium, and the recording medium is redrawn.
- the clock becomes unstable immediately after re-pulling.
- the insertion cycle is counted based on the interval, so the count value is not counted as an accurate value immediately after re-locking the PLL, so the window setting position shifts from the normal operation.
- the correct synchronization pattern may not be detected with the conventional window width.
- the synchronization pattern 401c is detected from the synchronization pattern 401b detected first immediately after the seek operation.
- the insertion cycle 402 will be shorter than the normal interval because of the unstable clock, and the window 405 will be set to a position shorter than the normal setting position.
- the synchronization pattern 4 0 1 is obtained by searching the window 4 0 5 because a part of the width 4 0 5 a of the window 4 0 5 does not fit in the window 4 0 5. 1 c cannot be detected.
- the setting position of the window pulse is shifted from the original position where there is no change, as in the case of re-pulling of PLL. If the data string of the sync pattern leaks from inside the window due to this shift, the sync pattern cannot be detected.
- the clock becomes unstable at the boundary between the land and the group, making it difficult to read the data, or the optimal window between the land and the group.
- the width may be different. At this time, if the window width is set according to either the land or the group, a correct synchronization pattern may not be detected when reproducing data from the other.
- the clock at the time of PLL In order to reduce the insertion cycle count accuracy caused by the locking of the clock due to the instability of the PLL and the locking of the PLL due to the occurrence of the defect, the margin of the window width must be set aside ( Figure 4). In this case, it is advisable to widen the values of 404a, 405a, and 404b, 405b, etc.). In this case, a window that is too wide may cause false detection of the synchronization pattern during normal operation. There was a problem of increasing the possibility of occurrence.
- an algorithm with a high correction capability or an error correction algorithm with an increased number of iterations may be used in advance.
- the error correction capability is improved.
- processing time is increased even during normal operation. There were also problems such as waiting for data reading and increasing power consumption.
- the present invention solves the above-mentioned conventional problems. Even when a seek or a detect is detected, synchronization is detected at a correct position, and an original error correction algorithm is used. It is an object of the present invention to provide a data reproducing device or the like which can reproduce in a correct format.
- the first invention (corresponding to claim 1) is a Reproducing means for reproducing data recorded on the medium;
- Data error correction means for performing error correction processing based on a predetermined algorithm on data reproduced from the recording medium
- the data error correction unit is a data reproducing device that changes the predetermined algorithm according to the seek amount.
- the seek amount detecting means has a rewritable register
- the present invention is the above-described present invention in which an algorithm of an error correction process is changed by comparing a predetermined set value set for the register with the seek amount.
- the present invention as described above enhances the possibility of reproducing data in the original correct format by erroneous correction even when data reliability decreases after seeking.
- a third aspect of the present invention (corresponding to claim 3) comprises: a reproducing unit for reproducing data recorded on a recording medium;
- Clock counting means for counting a clock based on data reproduced from the recording medium
- Window generating means for estimating the position of the synchronization signal on the reproduced data based on the count value of the click, and generating a synchronization detection window signal having a predetermined width including the estimated position.
- Synchronization signal detection means for detecting a synchronization signal from data reproduced from the recording medium by searching in the synchronization detection window;
- a seek amount detecting means for monitoring a seek amount when reproducing data from the storage medium,
- the data reproducing apparatus is characterized in that the window generating means changes a width of the synchronization detection window signal for a predetermined period according to the monitored seek amount.
- the synchronization signal detecting means changes a detection criterion of the synchronization signal in accordance with the monitored seek amount. It is an invention.
- the seek amount detecting means has a rewritable register
- the window generating means changes the width of the synchronization detection window signal by comparing a predetermined set value set in the register with the seek amount.
- a sixth aspect of the present invention in the predetermined period in which the width of the synchronization detection window signal is changed, the detection of the synchronization signal is stable after the seek operation is completed.
- the present invention is the above-mentioned present invention, which is a time until the operation is performed.
- the seventh invention (corresponding to claim 7) is the invention as described above, wherein the predetermined period during which the width of the synchronization detection window signal is changed is related to the magnitude of the seek amount.
- An eighth aspect of the present invention is the above-described invention, wherein the magnitude of the change width of the synchronization detection window signal is associated with the magnitude of the seek amount.
- the present invention as described above is safe even when data reliability decreases after seeking. This increases the possibility that a correct synchronization pattern can be detected.
- a ninth aspect of the present invention includes: a reproducing unit for reproducing data recorded on a recording medium;
- Data error correction means for performing error correction processing based on a predetermined algorithm on data reproduced from the recording medium
- a data detecting device for detecting a defect of the recording medium wherein the data error correcting device is a data reproducing device that changes the predetermined algorithm during a period in which the differential is detected.
- the differential detection means determines the type Z or size of the differential, and the error correction means determines the type.
- the present invention is the above-described present invention in which the predetermined algorithm to be changed is changed according to the type and Z or the size of the difference.
- the present invention as described above enhances the possibility that the data can be reproduced in the original correct format by error correction even when the reliability of the data is reduced at the time of detecting the difference.
- the eleventh invention (corresponding to claim 11) includes a reproducing means for reproducing data recorded on a recording medium
- Clock counting means for counting a clock based on data reproduced from the recording medium
- a position of a synchronization signal on the reproduced data is estimated based on the count value of the click, and a synchronization detection signal having a predetermined width including the estimated position is included.
- Synchronization signal detection means for detecting a synchronization signal from data reproduced from the recording medium by searching in the synchronization detection window
- a defect detecting means for detecting a defect of the recording medium based on data reproduced from the recording medium
- the window generating means is a data reproducing apparatus that changes a width of a synchronization detection window signal at least during a period in which the effect is detected.
- the difference detection means determines the type Z or size of the differential
- the window generation means determines the type. The present invention as described above, wherein the magnitude of the change width of the synchronization detection window signal is changed according to the type and Z or the size of the differential.
- the window generating means detects the deflate, and changes the width of the window signal.
- the present invention as described above, wherein the width of the synchronization detection window signal is continuously changed for a predetermined period.
- a fourteenth aspect of the present invention (corresponding to claim 14) is that the predetermined period is a time from completion of the detection of the diff to completion of stable detection of the synchronization signal.
- the synchronization signal detecting means changes the synchronization signal detection reference in accordance with the detection of the diffinitat. Data reliability decreased when detecting differences It increases the possibility that a correct synchronization pattern can be detected stably even at times.
- a sixteenth aspect of the present invention reproduces data recorded on a recording medium in which land tracks and group tracks are alternately formed in a spiral or concentric manner. Playback means to
- Error correction means for performing error correction processing based on a predetermined algorithm on data reproduced from the recording medium
- Track discriminating means for discriminating at least whether the reproduced data has been reproduced from the track on the land or from the track on the group.
- the data error correction unit is a data reproducing device that changes the predetermined algorithm according to a determination result of the track determination unit.
- a seventeenth invention reproduces data recorded on a recording medium in which land tracks and group tracks are alternately formed in a spiral or concentric manner. Playback means to
- Clock counting means for counting a clock based on data reproduced from the recording medium
- Window generating means for estimating a position of a synchronization signal on the reproduced data based on the count value of the click, and generating a synchronization detection window signal having a predetermined width including the estimated position.
- Synchronization signal detection means for detecting a synchronization signal from data reproduced from the recording medium by searching in the synchronization detection window
- Track discriminating means for at least discriminating whether or not the data is reproduced from a loop track
- the window generating unit is a data reproducing device that changes a width of a synchronization detection window signal according to a result of the determination by the track determining unit.
- an eighteenth aspect of the present invention (corresponding to claim 18) is characterized in that the synchronization signal detecting means changes a detection criterion of the synchronization signal in accordance with a determination result of the track determination means.
- the present invention as described above increases the possibility that a correct synchronization pattern can be detected stably even when the reliability of data is reduced due to the current position or a change in the current position.
- a nineteenth invention (corresponding to claim 19) is that the window generating means has a rewritable register,
- the width of the synchronization detection window signal is changed by a predetermined width set for the register.
- a twenty-second invention (corresponding to claim 20) is the present invention, wherein the seek amount detecting means detects the seek amount using an address detected from the storage medium.
- the effect detecting means analyzes the envelope of the RF signal read from the storage medium to detect the effect. It is.
- a twenty-second invention (corresponding to claim 22) is the present invention, wherein the track determination means performs the determination operation using an address detected from the storage medium.
- a twenty-third aspect of the present invention (corresponding to claim 23) is a data reproducing apparatus according to the first aspect of the present invention, comprising: a reproducing unit for reproducing data recorded on a recording medium; All or part of a data error correction unit that performs error correction processing based on a predetermined algorithm on the reproduced data, and a seek amount detection unit that monitors a seek amount when reproducing data from the storage medium. It is a program that makes a computer function as a computer.
- the data reproducing apparatus of the thirteenth aspect of the present invention comprises: a reproducing unit for reproducing data recorded on a recording medium; Clock counting means for counting a clock based on the reproduced data; and a predetermined width including a position of the synchronization signal on the reproduced data based on the count value of the clock, and including the estimated position.
- Window detection means for generating a synchronization detection window signal, a synchronization signal detection means for detecting a synchronization signal from data reproduced from the recording medium by searching the synchronization detection window, and data from the storage medium.
- This is a program for making the combi- ator function as all or a part of seek amount detecting means for monitoring the seek amount when reproducing the program.
- the data reproducing apparatus of the twenty-fifth aspect of the present invention comprises: a reproducing unit for reproducing data recorded on a recording medium; A program for causing a computer to function as all or part of data error correction means for performing error correction processing based on a predetermined algorithm on the obtained data, and defect detection means for detecting a defect on the recording medium. is there.
- the twenty-sixth invention (corresponding to claim 26) is based on the data of the eleventh invention.
- Reproducing means for reproducing data recorded on a recording medium, a clock counting means for counting a clock based on data reproduced from the recording medium, and Window generating means for estimating the position of the synchronization signal on the reproduced data, generating a synchronization detection window signal having a predetermined width including the estimated position, and searching the synchronization detection window # And / or a synchronizing signal detecting means for detecting a synchronizing signal from data reproduced from the recording medium; and a defect detecting means for detecting a defect of the recording medium based on data reproduced from the recording medium.
- It is a program for making a computer function as a part.
- a twenty-seventh aspect of the present invention is the data reproducing apparatus of the sixteenth aspect, wherein land tracks and group tracks are alternately formed in a spiral or concentric manner.
- Reproducing means for reproducing data recorded on the recorded recording medium, error correcting means for performing error correction processing based on a predetermined algorithm on data reproduced from the recording medium, and the reproduced data.
- It is a program for causing a computer to function as all or a part of a track discriminating means for discriminating at least whether data is reproduced from the land track or the group track.
- tracks of lands and tracks of groups are alternately formed in a spiral or concentric manner.
- Reproducing means for reproducing data recorded on the recorded recording medium clock counting means for counting the clock based on the data reproduced from the recording medium, and reproducing the data based on the count value of the clock.
- Window generation means for generating a synchronization detection window signal having a width of: a synchronization signal detection means for detecting a synchronization signal from data reproduced from the recording medium by searching the synchronization detection window; A program for causing a computer to function as a whole or a part of a track discriminating means for discriminating at least whether the reproduced data is reproduced from the land track or from the group track.
- FIG. 1 is a block diagram showing signal processing of the data reproduction device according to Embodiment 1 of the present invention.
- FIG. 2 is a block diagram showing signal processing of the data reproduction device according to Embodiment 2 of the present invention.
- FIG. 3 is a block diagram showing signal processing of the data reproducing apparatus according to Embodiment 3 of the present invention.
- FIG. 4 is a schematic diagram for explaining window processing in a conventional data reproducing device.
- FIG. 1 is a block diagram showing signal processing of the data reproducing apparatus according to the present invention using an optical disc as an example.
- 110 is an optical disk
- 111 is an RF signal
- 120 is a read channel block
- 121 is read data
- 122 is a read clock
- 140 is a synchronization detection block
- 141 is a synchronization pattern detection signal
- 150 is data Demodulation block
- 151 is demodulated data
- 160 is window generation block
- 160 is window pulse
- 170 is change width setting register
- 180 is address detection block
- 181 address information
- 190 is seek amount detection block
- 201 is a seek change signal
- 220 is a memory
- 221 is a memory data bus
- 222 is transfer data
- 230 is an error correction block
- 240 is a data transfer block
- 241 is reproduction data.
- the RF signal 111 read from the optical disk 110 is input to the read channel block 120 and is subjected to binary filtering.
- the binarized read data 1 2 1 and read clock 1 2 2 are input to the synchronization detection block 1 40, from which a synchronization pattern is detected.
- the synchronization detection block 140 detects the synchronization pattern, it inputs the synchronization pattern detection signal 141 to the window generation block 160.
- the window generation block 160 predicts the position where the next synchronization pattern is inserted in the data string read from the optical disk 110 based on the input synchronization pattern detection signal 141, A window pulse 161 having a width set in advance on the data string is returned to the synchronization detection block 140 centering on the position.
- the synchronization detection block 140 to which the window pulse 161 has been input performs the synchronization detection within the window pulse 161 thereafter.
- the synchronization detection block 140 inserts a pseudo synchronization detection signal or cannot detect the synchronization pattern continuously. In this case, it also has a function to determine that synchronization has been lost and to detect a synchronization pattern regardless of the window pulse.
- the data demodulation block 150 demodulates the read data 1221, which has been binary-coded by the read clock 122, in a predetermined format based on the synchronization pattern detection signal 141.
- the demodulated data 151 is input to the address detection block 180, and the address information 181 is extracted.
- the seek amount detection block 190 calculates the seek amount based on the extracted address information 181, and seeks when the calculated seek amount exceeds a predetermined value. Outputs the change signal 201.
- the seek amount detection block 190 has a seek amount setting register 200 that can be set externally, and detects a seek amount exceeding the value set in this register 200. Output seek change signal 201.
- the seek amount is detected based on the extracted address information 181.
- this is an embodiment, and for example, a pickup for reading data from the disk 110 is used. It is also possible to detect the seek amount by using the track cross signal obtained by the servo block that controls the tracking and the tracking off signal indicating that tracking has been lost.
- the window generation block 160 changes the width of the window pulse 161 by a predetermined amount and outputs it. At this time, it is desirable to change the width of the window pulse 16 1 wider than before receiving the seek change signal 201.
- the window generation block 160 has a change width setting register 170 that can be set from the outside, and changes the width of the indoor window 16 1 by the value set in the register 170. It is also possible. Further, the magnitude of the width to be changed based on the seek amount detected by the seek amount detection block 190 may be changed. For example, when the seek amount is large, the width of the window pulse 16 1 may be larger than the width when the seek amount is small.
- the window generation block 160 changes the width of the window pulse 161.
- the width of the window pulse 161 is changed.
- the predetermined period The block may be based on (for example, proportional to) the seek amount detected by the block detection block 190, or after the width of the window pulse 161 is changed, the synchronization detection block 140 is set S, continuous
- the number of times the synchronization pattern is detected may be used as a reference, or may be a time set externally by a register or the like.
- the data 151 demodulated by the data demodulation block 150 is further stored in the memory 220.
- the error correction block 230 performs read error correction processing from the memory 220 using the memory data path 222, and if an error is detected, uses the memory data bus 222 to perform memory read processing. Correct the specified data in.
- the seek change signal 201 is also input to the error correction block 230, and the error correction block 230 uses the seek change signal 201 to perform the error correction algorithm, that is, the error correction.
- the error correction algorithm that is, the error correction.
- the number and order of error correction may be selected from a plurality of predetermined combinations based on the magnitude of the seek amount.
- the transfer data 222 that has been subjected to the error correction processing is sent from the memory 220 to the data transfer block 240, and is output to the outside as reproduction data 240.
- the width of the window pulse 16 1 can be increased or an error correction algorithm can be used.
- the seek change signal 201 must be input to the synchronization detection block 140.
- the synchronization detection block 140 changes the detection reference of the synchronization pattern and resembles the original synchronization pattern.
- the pattern may be detected as a synchronization pattern. This makes it possible to detect the sync pattern even if the sync pattern is missing or incorrect, and the window is correctly processed, but the sync pattern cannot be detected.
- the synchronization detection block 140 has a synchronization detection pattern setting register 144 that can be set externally, and is set in the synchronization detection pattern setting register 142. Can be detected as a synchronization pattern.
- FIG. 2 is a block diagram showing signal processing of the data reproducing apparatus according to the present invention using an optical disc as an example.
- the same reference numerals as those in FIG. 1 denote the same or corresponding parts.
- Reference numeral 130 denotes a differential detection block.
- the RF signal 111 read from the optical disk 110 is input to the read channel block 120 and is binary-coded.
- the detect detection block 130 detects the presence of the BDO (B lack Dot Out), scratch, finger print, etc. by observing the envelope of the RF signal 111. And outputs the change detection signal 13 1.
- the effect detection block 130 It is also possible to determine the type and size of the effect by observing the time and amplitude when the loop is changing, add the type and size of the effect to the effect detection signal 131 as information, and output the bus. It is.
- the binarized read data 1 2 1 and read clock 1 2 2 are input to the synchronization detection block 1 40, from which a synchronization pattern is detected.
- the synchronization detection block 140 detects a synchronization pattern, it inputs a synchronization pattern detection signal 141 to the window generation block 160.
- the window generation block 160 predicts the position where the next synchronization pattern is inserted in the data string read from the optical disk 110 based on the input synchronization pattern detection signal 141, A window pulse 161 having a width set in advance on the data string is returned to the synchronization detection block 140 centering on the position.
- the synchronization detection block 140 to which the window pulse 161 has been input performs the synchronization detection within the window pulse 161 thereafter.
- the synchronization detection block 140 inserts a pseudo synchronization detection signal or cannot detect the synchronization pattern continuously. In this case, it has a function to determine that synchronization has been lost and to detect a synchronization pattern regardless of the window pulse.
- the window detection block 160 detects the difference regardless of the synchronous pattern detection state of the synchronous detection block 140 based on the signal. While the signal 13 1 is being detected, the width of the window pulse 16 1 is always changed by a predetermined amount. At this time, it is desirable to change the width of the window pulse 16 1 wider than before receiving the differential detection signal 13 1. This allows This makes it possible to reduce the situation in which it is impossible to detect a synchronization pattern due to the effect, and to more quickly detect the synchronization pattern.
- the window generation block 160 has a change width setting register 170 that can be set from the outside, and changes the width of the window / pulse 16 1 by the set value. Is also possible.
- the width of the window pulse to be changed may be changed based on the type and size of the change output from the change detection block 130. For example, when the difference is large, the change width of the window pulse 16 1 may be set to be larger than the change width when the difference is small. If the type of differential is caused by a large scratch on the disk or contamination by dust, etc., the window pulse 16 1 should be changed in a large range, and the type of differential should be a small scratch on the disk. If it depends on the degree, the change width of the window pulse 16 1 may be reduced.
- the window generation block 1610 does not receive the effect detection signal 131, so The width of the window pulse 16 1 is returned to the value before receiving the change detection signal 13 1, and the operation returns to normal operation.
- the synchronization detection block 140 detects the synchronization once after the synchronization is lost once after the deviation detection signal 131 is output.
- ⁇ Window generation block 1650 starts decoding from change detection block 1300. Even if the effect detection signal 131 has not been received, the width of the window ⁇ pulse 161 is continuously changed for a predetermined period. At this time, the predetermined period may be based on (for example, proportional to) the type of the defect detected by the defect detection block 130, or based on the type, or the width of the window pulse 161 may be changed. After that, the number of times the synchronization detection block 140 continuously detects the synchronization pattern may be used as a reference. Also, the time may be set externally by a register or the like.
- the data demodulation block 150 demodulates the read data 1 2 1 binarized by the read clock 1 2 2 in a predetermined format based on the synchronization pattern detection signal 1 4 1.
- the demodulated data 151 is input to the address detection block 180, and the address information 181 is extracted.
- the demodulated data 15 1 is further stored in the memory 220.
- the error correction block 230 reads data from the memory 220 using the memory data bus 221 and executes error correction processing. If an error is found, the error correction block 230 uses the memory data bus 221. To correct predetermined data in the memory. At this time, the differential detection signal 13 1 is also input to the error correction block 230, and the error correction block 230 uses the differential detection signal 13 1 to execute an error correction algorithm, that is, an error correction. By changing the number of times and Z or order, it is possible to perform correction processing according to the seek amount. At this time, the number and order of error correction may be selected from a plurality of predetermined combinations based on the size and type of the differential.
- the transfer data 222 that has been subjected to the error correction processing is sent from the memory 220 to the data transfer block 240, and is output to the outside as reproduction data 240.
- the synchronization pattern can be reliably determined even when input data is unreliable by changing the error correction algorithm. As well as detecting, stable data reproduction becomes possible.
- the width of the window / pulse 16 1 is changed in advance, so that even if a difference is detected, it is possible to reduce the situation in which a synchronization pattern cannot be detected. . .
- the change detection signal 1331 can be input to the synchronization detection block 140.
- a pattern similar to the original synchronization pattern may be detected as a synchronization pattern.
- the synchronization detection block 140 has an externally settable synchronization detection pattern setting register 142, and the pattern set in the synchronization detection pattern setting register 142 is also detected as a synchronization pattern. It is possible.
- FIG. 3 is a block diagram showing signal processing of the data reproducing apparatus according to the present invention using an optical disc as an example.
- the same reference numerals as those in FIG. 1 denote the same or corresponding parts.
- Reference numeral 210 denotes a current position determination block.
- the RF signal 111 read from the optical disk 110 is input to the read channel block 120 and binary-coded.
- the binarized read data 1 2 1 and read clock 1 2 2 are input to the synchronization detection block 1 40, from which the synchronization pattern is detected.
- the synchronization detection block 140 detects the synchronization pattern, it inputs the synchronization pattern detection signal 141 to the window generation block 160.
- the window generation block 160 predicts the position where the next synchronization pattern is inserted in the data string read from the optical disk 110 based on the input synchronization pattern detection signal 141, A window pulse 161 having a width set in advance on the data string is returned to the synchronization detection block 140 centering on the position.
- the synchronization detection block 140 to which the window pulse 161 has been input performs the synchronization detection within the window pulse 161 thereafter.
- the synchronization detection block 140 inserts a pseudo synchronization detection signal or cannot detect the synchronization pattern continuously. In this case, it also has a function to determine that synchronization has been lost and to detect a synchronization pattern regardless of the window pulse.
- the data demodulation block 150 demodulates the read data 122, which has been binarized by the read clock 122, in a predetermined format based on the synchronization pattern detection signal 141.
- the demodulated data 151 is input to an address detection block 180, and address information 181 is extracted.
- the current position setting block 210 is based on the extracted address information 181.
- the current position (land track or groove track force) of the data detection source is calculated, and the calculation result is output as the current position signal 211.
- the current position is detected based on the extracted address information 181, but this is an example, and the current position is obtained, for example, from the tracking error signal. But it is possible to detect.
- the window generation block 160 receives the current position signal 211 from the current position determination block 210, and changes the width of the window pulse 161 by a predetermined amount based on the signal and outputs it. At this time, it is desirable to change the width of the window pulse 16 1 wider than before receiving the current position signal 2 1 1. Further, the change of the width based on the determination result of the current position determination block 210 may be such that the group track is wider than the land track, or vice versa. Further, the magnitude of the change width may be changed in accordance with a change from a land track to a groove track or a change from a group track to a land track.
- the window generation block 160 is provided with a change width setting register 170 that can be set externally, and the width of the window pulse 16 1 can be changed using only the set value. It is possible.
- the data 151 demodulated by the data demodulation block 150 is further stored in the memory 220.
- the error correction block 230 executes read error correction processing from the memory 220 using the memory data bus 221 and, if an error is found, uses the memory data bus 221 to execute the memory correction. Correct the specified data in.
- the current position signal 211 is also input to the error correction block 230, and the error correction is performed.
- Block 230 can use this current position signal 211 to perform an error correction algorithm, that is, change the number and / or order of error correction, and perform correction processing according to the seek amount. It is. At this time, the number and order of the error corrections are determined based on the current position (land or group strength, or after a single land or a shift to a groove booland).
- the transfer data 222 after the error correction processing is sent to the data transfer block 240 from the memory 220 and sent to the outside as the reproduction data 240. Is output.
- a reproducing apparatus that reproduces data recorded on a recording medium on which both land and groove tracks are formed alternately in a spiral or concentric manner is provided.
- the synchronization pattern can be reliably detected even when the input data is unreliable.
- the current position signal 211 can be input to the synchronization detection block 140.
- the period during which the current position signal 211 is input is set to the synchronization detection block 140.
- the synchronization pattern detection criterion may be changed to detect a pattern similar to the original synchronization pattern as a synchronization pattern.
- the synchronization pattern detection operation is performed. Can be continued.
- the synchronization detection block 144 has a synchronization detection pattern setting register 144 that can be set from the outside. The pattern set in the star 14 2 can also be detected as a synchronization pattern.
- the reproducing means and the clock counting means of the present invention correspond to the read channel block 120 of each embodiment, and the data error correcting means of the present invention corresponds to the error correcting block 2 of each embodiment.
- the seek amount detecting means of the present invention corresponds to the seek amount detecting block 190 of each embodiment
- the synchronous signal detecting means of the present invention corresponds to the synchronous detecting block 14 of each embodiment.
- the window generating means of the present invention corresponds to the window generating block 160 of each embodiment
- the defect detecting means of the present invention corresponds to the window detecting block 130 of each embodiment.
- the track determination means of the present invention corresponds to the current position determination block 210 of each embodiment.
- the synchronization signal of the present invention corresponds to the synchronization pattern of each embodiment
- the clock of the present invention corresponds to the read clock 122 of each embodiment
- the synchronization detection window signal of the present invention corresponds to each embodiment.
- the algorithm for changing the error correction algorithm of the data reproduced from the recording medium based on either the seek amount, the defect, or the current position (land or group) of the recording medium The data reproducing apparatus of the present invention, and the present invention for changing the width of a window signal of a period detection window of data reproduced from a recording medium based on any of a seek amount, a deviation, or a current position (land or group) of the recording medium.
- the above description has been made assuming that the data reproducing device and the data reproducing device are integrated with each other, but the present invention may be embodied with either one of them alone.
- the present invention may have a configuration in which the error correction block 230 is omitted in the first to third embodiments. Also, in Embodiment 1, The present invention includes a configuration in which the window generation block 160 outputs a fixed width window pulse to the synchronization detection block 140 as in the conventional example regardless of whether the seek change signal 201 is input or not.
- the recording medium of the present invention has been described as the optical disk 110, but the optical disks include C, D, CD-R, CD-RW, and DVD-ROM s DVD. -RAM, DVD-R, DVD-RW, etc. may be used.
- the recording medium of the present invention may be a magneto-optical disk such as an MO. Further, it may be a magnetic disk such as a hard disk.
- the present invention is a program for causing a computer to execute all or a part of the functions of the above-described data reproducing apparatus of the present invention, and is a program that operates in cooperation with the computer.
- Some means of the present invention mean some means of the plurality of means, or some functions of one means. .
- a computer-readable recording medium on which the program of the present invention is recorded is also included in the present invention.
- One mode of use of the program of the present invention is a mode in which the program is recorded on a computer-readable recording medium and operates in cooperation with the computer.
- One usage of the program of the present invention may be a mode in which the program is transmitted through a transmission medium, read by a computer, and operates in cooperation with a computer.
- the recording medium includes ROM and the like, and the transmission medium includes light: Transmission mechanisms such as the Internet, light, radio waves, and sound waves.
- the computer of the present invention described above is not limited to a pure hardware such as a CPU, but may include firmware, OS, and peripheral devices.
- the configuration of the present invention may be realized as software or as a hardware.
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Signal Processing For Digital Recording And Reproducing (AREA)
- Optical Recording Or Reproduction (AREA)
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001571417A JP3865634B2 (ja) | 2000-03-28 | 2001-03-27 | データ再生装置、プログラム及び記録媒体 |
US09/980,202 US7038983B2 (en) | 2000-03-28 | 2001-03-27 | Data reproduction apparatus having a variable synchronization detection window |
US11/301,695 US7535810B2 (en) | 2000-03-28 | 2005-12-13 | Data reproduction apparatus |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2000-089686 | 2000-03-28 | ||
JP2000089686 | 2000-03-28 |
Related Child Applications (2)
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US09980202 A-371-Of-International | 2001-03-27 | ||
US11/301,695 Division US7535810B2 (en) | 2000-03-28 | 2005-12-13 | Data reproduction apparatus |
Publications (1)
Publication Number | Publication Date |
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WO2001073785A1 true WO2001073785A1 (fr) | 2001-10-04 |
Family
ID=18605409
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2001/002456 WO2001073785A1 (fr) | 2000-03-28 | 2001-03-27 | Dispositif de reproduction de donnees |
Country Status (6)
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US (2) | US7038983B2 (ja) |
JP (1) | JP3865634B2 (ja) |
KR (2) | KR100618238B1 (ja) |
CN (3) | CN1238855C (ja) |
TW (1) | TW559788B (ja) |
WO (1) | WO2001073785A1 (ja) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1553589A1 (en) * | 2004-01-07 | 2005-07-13 | Deutsche Thomson-Brandt Gmbh | Method for playback or recording of an optical recording medium |
KR100691919B1 (ko) * | 2005-03-09 | 2007-03-09 | 엘지전자 주식회사 | 불량 기록매체 판별방법 |
US20070074087A1 (en) * | 2005-09-27 | 2007-03-29 | Hong-Jing Lo | System and method for writing information to an optical medium with predicting of defect characteristics |
JP4516939B2 (ja) * | 2006-06-23 | 2010-08-04 | 株式会社東芝 | 光ディスク記録装置 |
KR100745270B1 (ko) * | 2006-07-24 | 2007-08-01 | 엘지전자 주식회사 | 불량 기록매체 판별방법 |
JP4823880B2 (ja) * | 2006-12-05 | 2011-11-24 | 株式会社日立製作所 | 包絡線異常検出機能を備えた光ディスクドライブ |
JP5344790B2 (ja) * | 2006-12-28 | 2013-11-20 | 富士フイルム株式会社 | 硬化性組成物、カラーフィルタ及びその製造方法 |
JP4890388B2 (ja) * | 2007-08-22 | 2012-03-07 | 富士フイルム株式会社 | 着色感光性組成物、カラーフィルタ及びその製造方法 |
US8077571B1 (en) * | 2007-12-05 | 2011-12-13 | Link—A—Media Devices Corporation | Storage media defect detection |
US20090200890A1 (en) * | 2008-02-10 | 2009-08-13 | Empire Magnetics Inc. | Winding For An Axial Gap Electric Dynamo Machine |
JP2010154160A (ja) * | 2008-12-25 | 2010-07-08 | Fujitsu Ltd | 同期検出回路及び同期検出方法及びインタフェース回路 |
US11394809B2 (en) * | 2019-06-28 | 2022-07-19 | Beatdapp Software Inc. | System and method for continuous tracking of media playback using blockchain |
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- 2001-03-27 WO PCT/JP2001/002456 patent/WO2001073785A1/ja active IP Right Grant
- 2001-03-27 TW TW090107253A patent/TW559788B/zh not_active IP Right Cessation
- 2001-03-27 JP JP2001571417A patent/JP3865634B2/ja not_active Expired - Fee Related
- 2001-03-27 US US09/980,202 patent/US7038983B2/en not_active Expired - Fee Related
- 2001-03-27 KR KR1020017015236A patent/KR100618238B1/ko not_active IP Right Cessation
- 2001-03-27 KR KR1020057020637A patent/KR100618239B1/ko not_active IP Right Cessation
- 2001-03-27 CN CNB018006965A patent/CN1238855C/zh not_active Expired - Fee Related
- 2001-03-27 CN CNB2006100046195A patent/CN100492518C/zh not_active Expired - Fee Related
- 2001-03-27 CN CNB2005100672739A patent/CN100414634C/zh not_active Expired - Fee Related
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Also Published As
Publication number | Publication date |
---|---|
KR100618239B1 (ko) | 2006-09-01 |
US20030018931A1 (en) | 2003-01-23 |
CN1697061A (zh) | 2005-11-16 |
KR20020021107A (ko) | 2002-03-18 |
KR20050111649A (ko) | 2005-11-25 |
CN100414634C (zh) | 2008-08-27 |
US20060133248A1 (en) | 2006-06-22 |
CN1822192A (zh) | 2006-08-23 |
CN1365498A (zh) | 2002-08-21 |
KR100618238B1 (ko) | 2006-09-01 |
JP3865634B2 (ja) | 2007-01-10 |
TW559788B (en) | 2003-11-01 |
CN1238855C (zh) | 2006-01-25 |
US7535810B2 (en) | 2009-05-19 |
CN100492518C (zh) | 2009-05-27 |
US7038983B2 (en) | 2006-05-02 |
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