WO2004013852A1 - ディスク再生装置とディスク再生方法 - Google Patents
ディスク再生装置とディスク再生方法 Download PDFInfo
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- WO2004013852A1 WO2004013852A1 PCT/JP2003/009924 JP0309924W WO2004013852A1 WO 2004013852 A1 WO2004013852 A1 WO 2004013852A1 JP 0309924 W JP0309924 W JP 0309924W WO 2004013852 A1 WO2004013852 A1 WO 2004013852A1
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- data
- synchronization
- synchronization pattern
- detection
- disk
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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
- G11B20/10305—Improvement or modification of read or write signals signal quality assessment
- G11B20/10324—Improvement or modification of read or write signals signal quality assessment asymmetry of the recorded or reproduced waveform
- G11B20/10333—Improvement or modification of read or write signals signal quality assessment asymmetry of the recorded or reproduced waveform wherein the asymmetry is linked to domain bloom
-
- 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
-
- 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
- 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
- G11B20/14—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
- G11B20/1423—Code representation depending on subsequent bits, e.g. delay modulation, double density code, Miller code
- G11B20/1426—Code representation depending on subsequent bits, e.g. delay modulation, double density code, Miller code conversion to or from block codes or representations thereof
-
- 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
- G11B20/12—Formatting, e.g. arrangement of data block or words on the record carriers
- G11B2020/1264—Formatting, e.g. arrangement of data block or words on the record carriers wherein the formatting concerns a specific kind of data
- G11B2020/1265—Control data, system data or management information, i.e. data used to access or process user data
- G11B2020/1287—Synchronisation pattern, e.g. VCO fields
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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
- G11B20/1403—Digital recording or reproducing using self-clocking codes characterised by the use of two levels
- G11B20/1423—Code representation depending on subsequent bits, e.g. delay modulation, double density code, Miller code
- G11B20/1426—Code representation depending on subsequent bits, e.g. delay modulation, double density code, Miller code conversion to or from block codes or representations thereof
- G11B2020/1457—Code representation depending on subsequent bits, e.g. delay modulation, double density code, Miller code conversion to or from block codes or representations thereof wherein DC control is performed by calculating a digital sum value [DSV]
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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
- G11B20/1403—Digital recording or reproducing using self-clocking codes characterised by the use of two levels
- G11B20/1423—Code representation depending on subsequent bits, e.g. delay modulation, double density code, Miller code
- G11B20/1426—Code representation depending on subsequent bits, e.g. delay modulation, double density code, Miller code conversion to or from block codes or representations thereof
- G11B2020/1461—8 to 14 modulation, e.g. the EFM code used on CDs or mini-discs
Definitions
- the present invention relates to a disk reproducing apparatus and a disk reproducing method for reproducing data recorded on a disk.
- a clock signal hereinafter, also referred to as “channel clock”
- PLL Phase-Locked Loop
- the acquired data is EFM (Eight-Fourteen
- the serial data Since the serial data is modulated, the data is demodulated by the EFM demodulation circuit in the reproducing apparatus. At this time, in the conventional reproducing apparatus, the operating frequency of the EFM demodulation circuit is determined by the channel clock synchronized with the serial data.
- the present invention has been made to solve the above-described problem, and an object of the present invention is to provide a disk reproducing apparatus and a disk reproducing method capable of performing a demodulation operation at a lower operating frequency. Disclosure of the invention
- a disc reproducing apparatus characterized by comprising: synthesizing means for generating synthesized data by performing decoding; and replacing means for generating reproduced data by replacing the synthesized data with corresponding demodulated data.
- the selecting means sequentially and selectively extracts the data of ⁇
- the demodulation power S is executed collectively in units of the combined data. Operating frequency can be reduced.
- the detection means detects a synchronization pattern from an array of data read out in a plurality of consecutive cycles, and detects the synchronization pattern.
- the detection timing is selected according to the position of the synchronization pattern included in the column, and the selection means includes counting means for counting the number of clocks of the internal clock signal from an initial value corresponding to the detection timing, and counting by the counting means Depending on the value, some data can be selectively extracted from the data read from the disk sequentially.
- the synthesizing means includes first and second data holding means.
- the first and second data holding means respectively hold the data extracted by the selection means, and the count value is When the number is odd, by transferring the data held in the second data holding means to the first data holding means, it is possible to generate composite data.
- Another object of the present invention is a disc playback method for reading data recorded on a disc to generate playback data, wherein the detection step detects a predetermined synchronization pattern included in the data and identifies a detection timing.
- a selection step of sequentially and selectively extracting a part of data from data read from the disk in accordance with the detected timing and a plurality of data extracted in the selection step.
- a replacement step of generating playback data by replacing the synthesis data with the corresponding demodulation data to achieve playback data.
- the detection step a synchronization pattern is detected from an array of data read in a plurality of continuous cycles, and the detection timing is determined according to the position of the synchronization pattern included in the array.
- the initial value according to the detection timing is According to the count value obtained by counting the number of clocks of the internal clock signal, a part of data is selectively extracted from the data read from the disk sequentially.
- the first and second data holding means hold the data extracted in the selection step, and when the count value is odd, the data held in the second data holding means is replaced with the first data. By transferring to the holding means, it is possible to generate composite data.
- FIG. 1 is a block diagram showing a configuration of a disk reproducing apparatus according to an embodiment of the present invention.
- FIG. 2 is a block diagram showing a configuration of the EFM demodulation unit shown in FIG.
- FIG. 3 is a block diagram showing a configuration of the synchronization detection circuit shown in FIG.
- FIG. 4 is a state transition diagram for explaining the operation of the synchronization detection circuit shown in FIG.
- FIG. 5 is a block diagram showing the configuration of the EFM demodulation circuit shown in FIG.
- FIG. 6 is a diagram showing a configuration of frame data recorded on the disc shown in FIG.
- FIG. 7 is a diagram for explaining the operation of the EFM demodulation circuit shown in FIG. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 7 is a diagram for explaining the operation of the EFM demodulation circuit shown in FIG. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1 is a block diagram showing a configuration of a disk reproducing apparatus according to an embodiment of the present invention.
- a disc reproducing device 3 is a device for reproducing data recorded on a mounted disc 1, and includes an asymmetry correction unit 5, a PLL circuit 7, and a serial It includes a parallel conversion circuit (hereinafter referred to as a serial-parallel conversion circuit 9), an EFM (Eight-Fourteen Modulation) demodulation unit 11, a control unit 13, a memory IF circuit 15, and a memory 17.
- a serial-parallel conversion circuit 9 parallel conversion circuit
- EFM Eight-Fourteen Modulation
- the asymmetry correction unit 5 receives the signal read from the disk 1, and the PLL circuit 7 and the serial / parallel conversion circuit 9 are connected to the asymmetry correction unit 5.
- the serial-parallel conversion circuit 9 is also connected to the PLL circuit 7, and the EFM (Eight-Fourteen Modulation) demodulation unit 11 is connected to the serial-parallel conversion circuit 9.
- the control unit 13 and the memory IF circuit 15 are connected to the EFM demodulation unit 11, and the memory 17 is connected to the memory IF circuit 15.
- the disc reproducing apparatus 3 having such a configuration uses the clock signal PCK 8 obtained by dividing the channel clock by 8 as an operation clock,
- Ashinmetori correcting unit 5 generates an EF M modulated digital signal S E by cutlet Bok the dc component to the signal read from the disk 1, supplied to the PLL circuit 7 and Siri parallel conversion circuit 9 I do.
- PLL circuits 7 generates a channel clock PCK to synchronize the digital signal S E, which is supplied, and supplies to the serial-parallel conversion circuit 9.
- Siri parallel conversion circuit 9 converts the supplied serial digital signal S E to the parallel signal S E 8 of 8 bits E FM modulated to 8 divides the supplied channel clock P CK Generates the clock signal PCK8.
- the parallel signal SE 8 is data obtained by subjecting an original EFM signal subjected to EFM modulation to NRZ (Non Return to Zero) conversion, and an example is shown in Table 1.
- E FM demodulator 1 1 as an operation clock of the clock signal P CK 8 supplied from the serial-parallel conversion circuit 9, also E FM demodulating a parallel signal S E 8 supplied from the serial-parallel conversion circuit 9 I do.
- the configuration and operation of the EFM demodulation unit 11 will be described later in detail.
- the data demodulated by the EFM demodulation unit 11 is stored in the error correction memory 17 via the memory IF circuit 15.
- the EFM demodulation unit 11 detects the subcode synchronization signal in the demodulation process as described later. Score signal indicating that the issued S c, and gill supplies sub Q code S q obtained after one check to the control unit 1 3.
- the ⁇ 1 ⁇ control unit 13 can obtain the absolute time information recorded on the disc 1 based on the supplied sub-Q code Sq.
- FIG. 2 is a block diagram showing a configuration of an EFM demodulation unit 11 shown in FIG. As shown in FIG. 2, it includes an EFM demodulation unit 11 f and a synchronization detection circuit 21, an EFM demodulation circuit 23, and a subcode reading circuit 25.
- the synchronization detection circuit 21 is connected to the serial / parallel conversion circuit 9
- the EFM demodulation circuit 23 is connected to the serial / parallel conversion circuit 9 and the synchronization detection circuit 21.
- the subcode readout circuit 25 is connected to the EFM demodulation circuit 23.
- the memory IF circuit 15 is connected to the EFM demodulation circuit 23 and the sub-code read circuit 25, and the control unit 13 is connected to the sub-code read circuit 25.
- the synchronization detection circuit 2 1 detects the synchronization pattern Ichin included in supplied / Parallel signal S E 8. Then, when the synchronization pattern is detected, a synchronization pattern predicted to be detected next is specified. Further, the predicted synchronization pattern is compared with the actually detected synchronization pattern to determine whether they match.
- the synchronization detection circuit 21 In order to prevent the detection of an erroneous synchronization pattern at unexpected timing, the synchronization detection circuit 21 internally generates a synchronization protection window for limiting the detection period to a predetermined evening, and at the above-mentioned predetermined timing, If the synchronization pattern cannot be detected, the synchronization is maintained by using the self-generated synchronization signal.
- EFM demodulating circuit 2 3 Siri 'subjected para conversion circuit 9, a Parallel signal S E 8 that has been supplied to EFM demodulation.
- the signal demodulated in this way is Are supplied to the memory IF circuit 15 and to the subcode read circuit 25.
- the sub-code readout circuit 25 detects a synchronization signal from the sub-codes included in the supplied demodulated signal, extracts a sub-Q code, which will be described later, from the signal, and determines whether there is an error in the sub-Q code. Check. Then, the sub-code reading circuit 25 supplies the sub-Q code to the control unit 13.
- FIG. 3 is a block diagram showing a configuration of the synchronization detection circuit 21 shown in FIG.
- the synchronization detection circuit 21 includes a synchronization pattern detection section 27, a synchronization pattern prediction section 29, a synchronization determination section 30 and a synchronization protection window section 35.
- the synchronization determination section 30 includes a synchronization counter 31, AND circuits 32 and 34, and a comparison section 33.
- the synchronization pattern detection unit 27 is connected to the serial-parallel conversion circuit 9, and the synchronization pattern prediction unit 29 is connected to the synchronization pattern detection unit 27.
- the synchronization counter 31 is connected to the synchronization pattern detection unit 27, and the AND circuit 32 is connected to the synchronization pattern detection unit 27 and the synchronization counter 31.
- the comparison section 33 is connected to the synchronization pattern detection section 27 and the synchronization pattern prediction section 29, and the AND circuit 34 is connected to the AND circuit 32 and the comparison section 33.
- the synchronization protection window section 35 is connected to the comparison section 33, the AND circuit 34, and the synchronization counter 31.
- the synchronization pattern detector 2 7 detects a synchronization pattern contained in the parallel signal S E 8 supplied, wherein synchronous power to be detected evening one down (frame synchronizing signal) is data after NRZ conversion
- synchronous power to be detected evening one down is data after NRZ conversion
- the detected data is from the most significant bit b1 to the least significant bit b8 in the first cycle, followed by the most significant bit b1 to the least significant bit b8 in the second cycle, and the third cycle. From the most significant bit b1 to the least significant bit b8, and from the most significant bit b1 to the least significant bit b8 in the fourth cycle.
- case number 0 in Table 2 indicates a case where the synchronization pattern is detected from bit b3 in the first cycle to most significant bit b1 in the fourth cycle.
- the synchronization pattern detection unit 27 determines which of the eight cases of the case numbers 0 to 7 has detected the synchronization pattern. In other words, the detection timing of the synchronization pattern is specified.
- the synchronization pattern detection unit 27 when the synchronization pattern is detected by any one of the eight patterns shown in Table 2 above, the synchronization pattern detection unit 27 generates a detection signal SSb that goes high in one cycle of the clock signal PCK8. At the same time, a case identification signal NSD is generated which indicates in which of the cases shown in Table 2 the synchronization pattern was detected.
- the synchronization pattern is detected at the timing of case number 2 shown in Table 2, the synchronization pattern is detected at the evening of case number 6 in the next frame. Then, in subsequent frames, the detection of the synchronization pattern by case numbers 2 and 6 is repeated alternately.
- the synchronization pattern prediction unit 2 9 depending on cases ⁇ IJ signal N SD supplied from the synchronization pattern detector 2 7 predicts whether synchronization pattern is detected by any of the case in the next frame A detection prediction signal N NS that specifies a predicted case is generated and supplied to the comparison unit 33. Therefore, when the comparison unit 3 3 that match detection prediction signal N NS Guarding the supplied case identification signal N SD, i.e. actually sync pattern detector 2 7 synchronization patterns detected in the case and the synchronization pattern prediction When the detection is predicted by the unit 29, the activated high-level signal is supplied to the AND circuit 34.
- the synchronization counter 31 counts the number of cycles from the detection of the synchronization pattern by the synchronization pattern detection section 27 to the detection of the next synchronization pattern.
- the synchronous counter 3 1 according to Ke Ichisu identification signal N SD supplied from the synchronization pattern detector 2 7, shown in Table 3 below; counter evening value initializes.
- the synchronization counter 3 1 has received the data of "0 1 h 'from the synchronization pattern detector 2 7 as cases ⁇ U signal N SD is the next synchronization pattern is detected after 7 3 cycles And initialize the counter value to 72 as shown in Table 3. Then, the synchronous counter 31 decrements the counter value at a rate of 1 with respect to the elapse of one cycle in accordance with the supplied detection signal SSb, and resets the counter value after the count value becomes 0.
- a timing prediction signal SN indicating the timing of detection of the synchronization pattern expected in the third cycle is generated and supplied to the AND circuit 32.
- the AND circuit 32 performs The activated high-level signal is supplied to the AND circuit 34.
- the synchronization determination unit 30 is able to match the case where the synchronization pattern is actually detected by the synchronization pattern detection unit 27 with the case where the detection is predicted by the synchronization pattern prediction unit 29, and When the synchronization pattern is detected at the timing predicted by 1, a high-level signal OK is supplied from the AND circuit 34 to the synchronization protection window 35 assuming that the synchronization pattern has been normally detected.
- the synchronization protection window section 35 uses the synchronization counter 31 to limit the timing of detecting the synchronization pattern.
- the synchronization pattern may be detected at a timing different from the ideal timing, and thus can be detected only within a certain range around the ideal timing.
- the synchronization protection window unit 35 generates mask data MD in accordance with the case identification signal N SD supplied as an identification signal N from the comparator 3 3, synchronization Feedback to pattern detector 27. Then, the synchronization pattern detection unit 27 generates a detection signal SSb after performing a logical product between the fourth cycle shown in Table 2 and the mask data MD.
- the synchronization protection window unit 35 when the case identification signal N SD of "0 1 h" is supplied from the comparator 3 3, mask detection start time (time window open) “1 1 1 1 1 1 0 0 0 0” is supplied to the synchronization pattern detection unit 27 as the data MD. Then, the synchronization protection window section 35 supplies “1 1 1 1 1 1 1 1” to the synchronization pattern detection section 27 as mask data MD during the synchronization pattern detection period. At this time, if the synchronization pattern detection section 27 detects an ideal synchronization pattern, the case identification signal N SD is set to “10h”.
- “0 0 00 1 1 1 1” is supplied to the synchronous pattern detection unit 27 as mask data MD at the detection end timing (when the window is closed).
- the detection start timing, the detection period, and the detection end timing are determined according to the counter value supplied from the synchronization counter 31.
- comparison unit 3 in 3 non-detection period of the synchronization pattern irrespective of the case identification signal N SD supplied from the synchronization protection window part 3 "0 5 0 0 0 0 “0 0 0” is supplied to the synchronous pattern detection unit 27 as mask data MD.
- the synchronization protection window unit 35 outputs the identification signal N as the identification signal Na for identifying the case where the synchronization pattern is detected, and outputs the signal OK as the detection signal SSa. I do.
- the synchronization pattern in the detection period (window) is the detection signal SS b and the case identification signal N SD /, fixed to Ireberu.
- the timing prediction signal SN is output from the AND circuit 32, and the synchronization prediction circuit 21 uses the timing prediction signal SN instead of the detection signal SSb.
- comparison unit 3 3 this time, the identification signal is supplied to the synchronization protection window unit 35 a detection prediction signal N NS instead of the case identification signal N SD as N, case identification signal N SD and detection prediction signal N NS If the signal does not match, a low level signal is supplied to the AND circuit 34.
- the synchronization protection window unit 35 outputs the detection prediction signal N NS as the detection J signal Na and outputs the signal supplied from the synchronization counter 31 as the detection signal SS a.
- the so-called interpolation function described above is limited, and if a normal synchronization pattern cannot be detected continuously more than the set number of times, the synchronization protection window unit 35 sets the mask data MD to “FFh”. By fixing to, the detection period restriction is released and synchronization is restored.
- a synchronization wait state waits for the detection of a synchronization pattern.
- the mask data MD is fixed to “F Fh” as described above, even in the synchronization protection window ⁇ section 35 f.
- the state transits to the synchronous backward protection state in which the number of times a normal synchronization pattern is continuously detected is less than three.
- the state shifts to a synchronous forward protection state in which the number of times a normal synchronization pattern cannot be detected is, for example, less than 12 consecutive times. If the synchronization pattern is detected in the window in the synchronous forward protection state, the state returns to the normal synchronization state. If the normal synchronization pattern cannot be detected one or two times continuously, Return.
- the above “12 times” is also set in advance in the synchronization protection window section 35 and is a variable setting value.
- FIG. 5 is a block diagram showing a configuration of the EFM demodulation circuit 23.
- the EFM demodulation circuit 23 includes a register section 40, a symbol counter 41, an initial value setting section 43, and a data replacement section 1551. So Then, the register section 40 is composed of a second register 45 and a first register 46, which form a two-stage register, a data combining section 47, a data selecting section 48, a spare register 49, and an EFM register. Including 50 in the evening.
- the symbol counter 41 is connected to the synchronization protection window section 35 and the serial / parallel conversion circuit 9, and the initial value setting section 43 is connected to the synchronization protection window section 35. Further, the symbol counter 41 and the initial value setting unit 43 are mutually connected.
- the second register 45 is connected to the serial / parallel conversion circuit 9.
- the first register 46 is connected to the second register 45, and the data synthesizing section 47 is connected to the first and second registers 46 and 45.
- the data selection section 48 is connected to the data synthesis section 47 and the symbol counter 41, and is connected to the spare register 49, the symbol counter 41 and the data selection section 48.
- the EFM register 50 is connected to the data selecting section 48 and the spare register 49, and the data replacing section 51 is connected to the EFM register 50 and the symbol counter 41.
- One frame of data recorded on the CD consists of 588 bits as described above, and the data configuration is shown in FIG.
- one frame of data consists of a 24-bit frame synchronization signal recorded at the beginning, a 14-bit subcode, and a first bit consisting of 14 bits each to be subjected to EFM demodulation.
- DSV Digital Sum Variation
- the EFM demodulation circuit 23 latches only the subcode and the first to 32nd data among the data of one frame shown in FIG. 6 as follows. First, the parallel signal output from the serial-parallel conversion circuit 9 To latch the S E 8 1 6-bit Bok units, first second register 4 5 latches the front half 8-bit data, and transfers the eight bits of data latched to the first register evening 4 6. After that, the second register newly latches the data of the last 8 'bits.
- the data synthesizing section 47 composed of a register synthesizes the 8-bit data latched in the first register 46 and the second register 45, respectively, and outputs the data R of 16 pits. Generated and supplied to the data selection unit 48.
- the symbol counter 41 loads an initial value from the initial value setting section 43 according to the detection signal SSa supplied from the synchronization protection window section 35.
- the initial value setting unit 43 supplies the load values shown in Table 5 below to the symbol counter 41 according to the identification signal Na supplied from the synchronization protection window unit 35.
- the symbol counter 41 sets the load value supplied from the initial value setting unit 43 as an initial value, and increments the initial value according to the clock signal PCK 8 supplied from the serial / parallel conversion circuit 9. I do.
- the data selector 48 selects a predetermined value from among the data R supplied from the data synthesizer 47. Are selectively extracted, and the extracted data are supplied to the spare register 49 and the EFM register 50, respectively. That is, for example, when the counter value is 2, the data selection section 48 selects 3-bit data from the lower 0 to 2 bits forming the data R. Selectively extract and supply to EFM register 50, selectively extract 10-bit data from lower 6 to 15 bits that constitute data R and supply to spare register 49 .
- the spare register 49 shifts the stored data to the EFM register 50 when the power supply value supplied from the symbol counter 41 is an odd number. That is, when the counter value becomes 3, for example, as shown in FIG. 7, the spare register 49 stores the 10-bit data from the lower 6 bits to the 15 bits of the stored data R, Shift to EFM register 50 as indicated by the arrow.
- the above operation is repeated by incrementing the counter value of the symbol counter 41 by one.
- the data in the EFM register 50 is shifted to the spare register 49, and the lower bit of the data R is supplied from the data selector 48, so that the count value becomes even.
- the modulated 14-bit data Sb is synthesized.
- the data replacement section 51 stores the 14-bit data Sb supplied from the EFM register 50 into the built-in EFM. Replace with demodulated data Sr according to the demodulation table.
- the demodulated data Sr generated by such a method is stored in the memory 17 via the memory IF circuit 15 and subjected to error correction processing, and is supplied to the subcode reading circuit 25.
- the data Sb is also supplied to the subcode reading circuit 25.
- the subcode reading circuit 25 shown in FIG. 2 is supplied from the EFM register 50. From the supplied data Sb, a synchronization signal recorded as a subcode (hereinafter, also referred to as “subcode synchronization signal”) is detected.
- subcode synchronization signal a synchronization signal recorded as a subcode
- the subcode synchronization signal in the subcode shown in FIG. 6 is recorded every 98 frames without EFM modulation, and the subcode synchronization signal not subjected to EFM modulation is Can be decoded.
- the subcode readout circuit 25 outputs the data Sb supplied from the EFM register 50 in the first synchronization pattern (1 00 0 00 00 0 0 0 1 0 0) or the second synchronization pattern (0 1 0 0 If 1 is 0 0 0 0 0 0000) either supplies it is determined that the subcode synchronizing signal can be detected to score signal S generates a c controls unit 1 3.
- the sub-code readout circuit 25 sequentially extracts information called a sub-Q code (sub-code pit) from sub-codes forming a part of the demodulated data Sr obtained by the EFM demodulation circuit 23, Input the 96-bit sub Q code SQ to the CRC (Cyclic Redundancy Check) circuit at once. If the CRC circuit determines that the sub-Q code is accurate data, the sub-code reading circuit 25 outputs the signal S. K is supplied to the control unit 13.
- a sub-Q code sub-code pit
- the sub-code reading circuit 25 supplies the above-mentioned sub-Q code SQ to the control unit 13.
- the sub-Q code is, for example, 96 bits and one unit.
- the sub Q code is held by a shift register having 10 steps. Then, in this case, the control unit 13 accesses the shift register 10 times, so that all the sub Q codes SQ held in the shift register are read.
- control unit 13 receives the score signal S c and the signal S from the EFM demodulation unit 11. By performing the above access upon receipt of r , By receiving the Q code Sq, absolute time information of one disk can be obtained with high accuracy.
- the sub-Q code Sq is stored in the memory 17 via the memory IF circuit 15, and is also used as data for specifying the demodulation data Sr generated by the EFM demodulation circuit 23.
- the 14-bit data Sb generated in the EFM register 50 is collectively processed by the data replacing section 51.
- the data recorded on the disc 1 is replaced by demodulated data Sr, and the data recorded on the disc 1 can be subjected to EFM demodulation at a lower operating frequency than the conventional one, for example, the conventional operating frequency of 1Z8.
- the circuit scale can be reduced.
- the operating frequency required for EFM demodulation can be reduced as described above, the power consumption of the disk reproducing device can be reduced, and noise generated in circuits other than the EFM demodulation unit 11 can be reduced. And the reproduction accuracy can be improved.
- the operating frequency required for demodulation can be reduced, so that it is possible to provide a disk reproducing apparatus with high reproduction accuracy and easy test.
- the operating frequency required for demodulation can be reduced, so that the power consumption for executing the reproducing operation can be reduced.
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Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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US10/521,201 US20060109761A1 (en) | 2002-08-06 | 2003-08-05 | Disk playback apparatus and disk playback method |
EP03766743A EP1536423A4 (en) | 2002-08-06 | 2003-08-05 | DISC REPRODUCTION DEVICE AND METHOD |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2002-229158 | 2002-08-06 | ||
JP2002229158A JP3760902B2 (ja) | 2002-08-06 | 2002-08-06 | ディスク再生装置とディスク再生方法 |
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WO2004013852A1 true WO2004013852A1 (ja) | 2004-02-12 |
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US (1) | US20060109761A1 (ja) |
EP (1) | EP1536423A4 (ja) |
JP (1) | JP3760902B2 (ja) |
KR (1) | KR20050034722A (ja) |
CN (1) | CN1675705A (ja) |
TW (1) | TWI229327B (ja) |
WO (1) | WO2004013852A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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KR100688523B1 (ko) * | 2005-01-19 | 2007-03-02 | 삼성전자주식회사 | 하드 디스크 드라이브 및 데이터 독출 방법 |
Families Citing this family (2)
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JP2009277298A (ja) * | 2008-05-15 | 2009-11-26 | Renesas Technology Corp | ディジタル信号再生装置及び方法並びにディジタル信号記録装置及び方法 |
KR101815474B1 (ko) | 2015-08-28 | 2018-01-05 | 이채원 | 왕겨, 미강이 함유된 건축 마감재 |
Citations (2)
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JPH08221907A (ja) * | 1995-02-20 | 1996-08-30 | Toshiba Corp | デジタルデータ処理回路 |
JPH08307405A (ja) * | 1995-05-10 | 1996-11-22 | Nec Eng Ltd | フレーム同期検出装置 |
Family Cites Families (6)
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US4879731A (en) * | 1988-08-24 | 1989-11-07 | Ampex Corporation | Apparatus and method for sync detection in digital data |
JPH04139666A (ja) * | 1990-09-30 | 1992-05-13 | Ricoh Co Ltd | 追記型光デイスクの信号処理用半導体集積回路および半導体装置 |
JP3306938B2 (ja) * | 1992-11-25 | 2002-07-24 | ソニー株式会社 | 同期符号抽出回路 |
US5677935A (en) * | 1995-01-11 | 1997-10-14 | Matsuhita Electric Industrial Co., Ltd. | Sync detecting method and sync detecting circuit |
BR9606290A (pt) * | 1995-04-03 | 1997-09-02 | Matsushita Electric Ind Co Ltd | Meio de gravação aparelho e método para transmissão de dados e aparelho e método para reprodução de dados |
JP3000964B2 (ja) * | 1997-06-20 | 2000-01-17 | 株式会社日立製作所 | ディジタル信号記録再生装置 |
-
2002
- 2002-08-06 JP JP2002229158A patent/JP3760902B2/ja not_active Expired - Fee Related
-
2003
- 2003-08-05 EP EP03766743A patent/EP1536423A4/en not_active Withdrawn
- 2003-08-05 CN CNA038190125A patent/CN1675705A/zh active Pending
- 2003-08-05 WO PCT/JP2003/009924 patent/WO2004013852A1/ja not_active Application Discontinuation
- 2003-08-05 US US10/521,201 patent/US20060109761A1/en not_active Abandoned
- 2003-08-05 KR KR1020057001511A patent/KR20050034722A/ko not_active Application Discontinuation
- 2003-08-06 TW TW092121528A patent/TWI229327B/zh not_active IP Right Cessation
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH08221907A (ja) * | 1995-02-20 | 1996-08-30 | Toshiba Corp | デジタルデータ処理回路 |
JPH08307405A (ja) * | 1995-05-10 | 1996-11-22 | Nec Eng Ltd | フレーム同期検出装置 |
Non-Patent Citations (1)
Title |
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See also references of EP1536423A4 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100688523B1 (ko) * | 2005-01-19 | 2007-03-02 | 삼성전자주식회사 | 하드 디스크 드라이브 및 데이터 독출 방법 |
Also Published As
Publication number | Publication date |
---|---|
KR20050034722A (ko) | 2005-04-14 |
TWI229327B (en) | 2005-03-11 |
US20060109761A1 (en) | 2006-05-25 |
JP3760902B2 (ja) | 2006-03-29 |
EP1536423A1 (en) | 2005-06-01 |
EP1536423A4 (en) | 2006-04-05 |
TW200415597A (en) | 2004-08-16 |
JP2004071055A (ja) | 2004-03-04 |
CN1675705A (zh) | 2005-09-28 |
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