CN100338663C - Method for decoding address data of optical drive - Google Patents
Method for decoding address data of optical drive Download PDFInfo
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- CN100338663C CN100338663C CNB2003101202407A CN200310120240A CN100338663C CN 100338663 C CN100338663 C CN 100338663C CN B2003101202407 A CNB2003101202407 A CN B2003101202407A CN 200310120240 A CN200310120240 A CN 200310120240A CN 100338663 C CN100338663 C CN 100338663C
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Abstract
The present invention relates to a method for decoding address data of an optical drive, which is used for decoding an input swinging signal to an address data unit signal. The method comprises the following steps: converting a swinging carrier frequency signal of the input swinging signal to a swinging carrier frequency signal having the same phase with the input swinging signal; multiplying the swinging carrier frequency signal having the same phase with the input swinging signal and the input swinging signal to generate a product signal; accumulating the product signal at every timepiece to generate a product sum signal; judging the phase of the input swinging signal generates a phase variation signal in the break over way according to the positive value and the negative value of the product sum signal; comparing the phase variation signal with multiple address data form to generate the address date unit signal.
Description
Technical field
The present invention relates to a kind of interpretation method and code translator of address date of CD-ROM drive, particularly relate to interpretation method and code translator that a kind of signal that utilizes the sum of products summation to produce is compared address date.
Background technology
Please refer to Fig. 1, Fig. 1 reads the synoptic diagram of the track 12 of discs 10 for known CD-ROM drive.In DVD+R/RW discs 10, track 12 can be divided into two kinds of tracks, and a kind of is to be used for the data track 14 of recorded information, and another kind is to be used for the swinging track 16 of each recording areas relative address information on the recording light disc 10.Data track 14 is the circular arc lines around discs 10 centers of circle, as track 12, though and swinging track 16 also is the circular arc line around discs 10 centers of circle, but swinging track 16 also can present the shape that crawls of skew by a small margin along circular arc line, moreover, swinging track 16 is continuous paths of giving prominence to, and data track 14 is then between outstanding swinging track 16 in the formed groove (groove).The discontinuous record mark 18 (corresponding pothole district) of interruption is arranged in the data track 14, being uneven in length of each record mark 18, reflection characteristic is also inequality, the record mark 18 that is uneven in length is being represented different data messages, therefore by the length of controlling recording mark 18, discs 10 just can record data.
The optical read head 20 of CD-ROM drive comprises four sensor Sa, Sb, Sc and Sd, can be used to read information in the swinging track 16.Because groove is different with the reflection characteristic of overhang, the volume reflection of the laser that sensor Sa, Sb, Sc, Sd sense is also different, by the measuring value of calculating sensor Sa to Sd, just can obtain a swinging signal (wobble signal).Along with the rotation of discs 10, optical read head 20 can skim over discs 10 along the direction of arrow 22, and obtains the measuring value of each sensor along track 12.For example, optical read head 20 is when the P1 of position, the position of sensor Sa and Sd is corresponding to the groove of data track 14, the position of sensor Sb and Sc is then corresponding to the overhang of swinging track 16, when optical read head 20 in-position P2, originally the sensor Sa above the groove and Sd can move to swinging track 16 overhangs above, relatively original sensor Sb and Sc above overhang, then can move to the groove top of data track 14, so the measuring value of sensor changes, and swinging signal also changes thereupon.Therefore, optical read head 20 can produce this swinging signal via swinging track, this swinging signal then can via a translator read address date (address inpre-groove, ADIP).
Please refer to Fig. 2 to Fig. 4, Fig. 2 to Fig. 4 is respectively the synoptic diagram of known swinging signal 24,26,28.Corresponding 93 hunting periods of per two recording areas meeting on the discs 10, wherein arranged 8 hunting periods, and (phase modulation, PM) mode is noted down address date with phase modulation (PM).As shown in Figure 2, swinging signal 24 comprise 8 hunting period W0, W1, W2, W3, W4, W5, W6, W7 note down the corresponding address data with phase modulation method, and in hunting period W0 and hunting period W4, swinging signal 24 can produce 180 ° phase change, the synchronous address date unit (ADIP sync unit) of swinging signal 24 corresponding a this moment.As shown in Figure 3, swinging signal 26 comprise 8 hunting period W0, W1, W2, W3, W4, W5, W6, W7 note down the information of corresponding address data with phase modulation method, and in hunting period W0, W1, W6, swinging signal 26 produces 180 ° phase change respectively, and this moment, swinging signal 26 corresponding logical values were 0 address date unit (ADIP data unit).As shown in Figure 4, swinging signal 28 comprise 8 hunting period W0, W1, W2, W3, W4, W5, W6, W7 note down the information of corresponding address data with phase modulation method, and in hunting period W0, W1, W4, W6, swinging signal 28 produces 180 ° phase change respectively, and this moment, swinging signal 28 corresponding logical values were 1 address date unit.
From the above, in the burned process of DVD+R/RW discs, important role is being played the part of in the decoding of address date, comprise the various information on all DVD+R/RW discs on the one hand, the frequency of swinging signal is also being represented the linear velocity of discs running on the other hand, for the mode that reads that waits wire rate (CLV), must be by the feedback signal of swinging signal as Spindle Motor, for the mode that reads that waits angular speed (CAV), then must produce and write clock (writing clock) by swinging signal.Yet swinging signal may as problems such as disc flaw, dyestuff material, laser powers, and have various noises or distortion because of various external interference, causes missing or the frequency shakiness of swinging signal of address date.
Summary of the invention
Therefore fundamental purpose of the present invention is to provide a kind of interpretation method and code translator of address date of CD-ROM drive, to address the above problem.
A kind of interpretation method of address date of CD-ROM drive is provided in the preferred embodiment of the present invention, be used for an input swinging signal is decoded as an address date cell signal, this CD-ROM drive comprises a phase lock circuitry, a cosine signal generator, a multiplier, a totalizer, a phase data processor and an address date cell detector, and this method comprises the following step: (a) the swing CF signal with this phase lock circuitry output is converted to and the synchronous swing CF signal of this input swinging signal via this cosine signal generator; (b) swing CF signal and this input swinging signal with this cosine signal generator output multiplies each other via this multiplier, to obtain a product signal; (c) this product signal is added up in each clock via this totalizer, to obtain a sum of products signal; (d) use this phase data processor to judge the phase place turnover of this input swinging signal, to obtain a phase-changing signal according to the positive negative value of this sum of products signal; And the value of (e) comparing this phase-changing signal and these a plurality of address date kenels in each clock one by one, when the address date kenel that has in these a plurality of address date kenels with the identical value of this phase-changing signal, then this address date kenel is added a counting, last to count maximum address date kenels as this address date cell signal.
Also provide a kind of in the preferred embodiment of the present invention an input swinging signal is decoded as the code translator of an address date cell signal, it includes: a phase lock circuitry is used for swinging CF signal according to this input swinging signal output one; One cosine signal generator is coupled to this phase lock circuitry, is used for this swing CF signal with the output of this phase lock circuitry to be converted to one and to swing CF signal with this input swinging signal synchronous; One multiplier is coupled to this cosine signal generator, is used for this swing CF signal and this input swinging signal that this cosine signal generator is exported are multiplied each other, to obtain a product signal; One totalizer is coupled to this multiplier, is used in each clock this product signal being added up, to obtain a sum of products signal; One phase data processor is coupled to this totalizer, is used for judging according to the positive negative value of this sum of products signal the phase place turnover of this input swinging signal, to obtain a phase-changing signal; An and address date cell detector, be coupled to this phase data processor, be used for comparing one by one the value of this phase-changing signal and these a plurality of address date type samples in each clock, when having an address date type sample to have identical value in these a plurality of address date type samples with this phase-changing signal, then this address date type sample is added a counting, last to count maximum address date type samples as this address date cell signal.
Description of drawings
Fig. 1 reads the synoptic diagram of the track of discs for known CD-ROM drive;
Fig. 2 is the synoptic diagram of the swinging signal of synchronous address date unit correspondence;
Fig. 3 is the synoptic diagram of swinging signal of the address date unit correspondence of logical value 0;
Fig. 4 is the synoptic diagram of swinging signal of the address date unit correspondence of logical value 1;
Fig. 5 is the block schematic diagram of ADIP code translator of the present invention;
Fig. 6 is the synoptic diagram of various signals among Fig. 5;
Fig. 7 is the synoptic diagram of the fuzzy comparison method of the present invention;
Fig. 8 is the synoptic diagram of the relative figure comparison of the present invention method;
Fig. 9 is the process flow diagram of the inventive method; With
Figure 10 is the tables of data of experimental result of the present invention.
The reference numeral explanation
10 discs, 12 tracks
14 data track, 16 swinging tracks
18 record marks, 20 optical read heads
30 ADIP code translators, 32 phase lock circuitries
34 write clock generation circuit 36 holding circuits
38 error-correcting code blocks, 40 decoding schemes
42 cosine signal generators, 44 multipliers
46 totalizers, 48 phase data processors
50 address date cell detector
Embodiment
Please refer to Fig. 5, Fig. 5 is the block schematic diagram of ADIP code translator 30 of the present invention.The ADIP code translator 30 of DVD+R/RW discs mainly comprises a phase lock circuitry 32, a decoding scheme 40, writes four parts such as a clock generation circuit 34 and a holding circuit 36.Wherein, phase lock circuitry 32 produces a swing CF signal (wobble carrier frequency) according to an input swinging signal, as data decoding, Spindle Motor control and the foundation that writes clock generating; Decoding scheme 40 solves an address date cell signal (0,1, or SYNC) according to this swinging signal, and through an error-correcting code (errorcorrection code, ECC) block 38 generation one swinging signal addresses (wobble address); Write clock generation circuit 34 and write the required clock signal of discs according to this swing CF signal generation; Holding circuit 36 can produce various reference signals to avoid interference of noise.Code translator 30 of the present invention provides the method for two kinds of decodings at decoding scheme 40, to improve the discrimination of data, decoding scheme 40 comprises a cosine signal generator 42, a multiplier 44, a totalizer 46, a phase data processor 48 and an address date cell detector 50, its running program as after.
Please refer to Fig. 6, Fig. 6 is the synoptic diagram of various signals among Fig. 5.Because the swing CF signal (DCOCLK) that phase lock circuitry 32 produces can be spent with the phasic difference mutually 90 of input swinging signal (ADIN), so utilize cosine signal generator 42 that the swing CF signal (DCOCLK) that phase lock circuitry 32 produces is converted to and imports the synchronous CF signal of swinging signal (ADIN) (DCOCLK_COS) earlier, re-using multiplier 44 multiplies each other synchronous CF signal (DCOCLK_COS) and input swinging signal (ADIN), in the phase encoding district, because both phase phasic difference 180 degree, so the product signal of gained (MUL) is a negative value.Then use totalizer 46 that product signal (MUL) is added up at each clock (fsck_cnt), obtain sum of products signal (qsum).Phase data processor 48 can judge that according to the positive negative value of sum of products signal (qsum) whether the phase place of input swinging signal (ADIN) transfers, and obtains phase-changing signal (phase_chg).At last, address date cell detector 50 produces address date cell signal (ADIP_UNIT) according to phase-changing signal (phase_chg), and its value is 0,1 or SYNC.After the great advantage of use product accumulation method is to import the processing of swinging signal process product accumulation method, stronger for the resistivity of noise.In addition, because the characteristic of phase modulation (PM), as long as the swing CF signal that phase lock circuitry 32 produces can be controlled in certain error range, the analog-to-digital converter that produces the input swinging signal can be very accurate.Yet, find that by experiment swinging signal is because the flaw during discs compacting itself, or because of the material characteristic changing that writes discs after the data, the distortion of the swinging signal that causes is even use the product accumulation method also to be difficult to judge the value of address date cell signal.Therefore, the invention provides fuzzy comparison method and relative figure comparison method, further improve the discrimination of address date cell signal.
Please refer to Fig. 7, Fig. 7 is the synoptic diagram of the fuzzy comparison method of the present invention.In theory, the value of address date cell signal (ADIP_UNIT) must be 0,1 or SYNC, so appearance place in the address date unit of importing swinging signal (ADIN), just the 84th clock (fsck_cnt) is to the 91st clock, the phase-changing signal (phase_chg) that to import swinging signal (ADIN) respectively with represent address date unit 0,1 and the kenel (pat_0 of SYNC, pat_1, pat_s) compare at each clock, if represent address date unit 0,1 and the kenel of SYNC identical with phase-changing signal, then with kenel count signal (pat_0_cnt, pat_1_cnt, pat_s_cnt) value increases progressively, if different, then the value of kenel count signal is constant.When phase-changing signal after all clocks are all finished comparison, get in three kenel count signals and have maximal value person, as the output valve of address date cell signal.Because three values of 0,1 and SYNC of address date cell signal are 8 phase change codings by the input swinging signal, therefore fuzzy comparison method tolerable has any phase change to be judged by accident in these 8 phase change, and still can find out and import the most close address date cell signal of swinging signal.Among Fig. 7, only the phase change at the 90th clock is different with the kenel of representing address date unit 0 (pat_0) by the phase-changing signal (phase_chg) of sum of products signal (qsum) decision, therefore kenel count signal (pat_0_cnt) obtains maximum value, so the value of decidable address date cell signal (ADIP_UNIT) is 0.
Please refer to Fig. 8, Fig. 8 is the synoptic diagram of the relative figure comparison of the present invention method.Serious or when direct current offset is arranged when the distortion of input swinging signal, the positive negative value of sum of products signal (qsum) may differ more than one phase change with right value, so that use fuzzy comparison method also can't correctly judge the value of address date cell signal (ADIP_UNIT).This moment can be by sum of products signal (qsum) in the 84th clock (fsck_cnt) to the 91st clock etc. in 8 clocks, find out 4 less clocks of value of sum of products, be encoded to 1, all the other 4 clocks then are encoded to 0, so can obtain synchronous kenel (sync_pattern), to represent the kenel (pat_0, pat_1, pat_s) of address date unit 0,1 and SYNC to compare again, and just can find out and import the most close address date cell signal of swinging signal with synchronous kenel.Among Fig. 8, can get the size order of 8 sum of products count signals (q1_cnt to q8_cnt) at the 92nd clock, be respectively 5 by the 1st sum of products count signal (q1_cnt) to the priority valve of the 8th sum of products count signal (q8_cnt), 1,3,4,2,0,7,6, the heal value of little expression sum of products of numerical value is bigger, therefore get the 84th, 87,90,91 clocks be encoded to 1, and the 85th, 86,88,89 clocks be encoded to 0, so the synchronous kenel (sync_pattern) that obtains is 1001_0011, with synchronous kenel respectively with represent address date unit 0,1 and the coding 1000_0011 of SYNC, 1000_1100 and 1111_0000 compare, kenel has only a different phase change with the coding of representing address date unit 0 synchronously as can be known, so the value of decidable address date cell signal (ADIP_UNIT) is 0.
Please refer to Fig. 9, Fig. 9 is the process flow diagram of the inventive method.Described in conjunction with Fig. 7 and Fig. 8, the inventive method comprises the following step:
Step 210: the swing CF signal of phase lock circuitry 32 outputs is converted to and the synchronous swing CF signal of an input swinging signal via cosine signal generator 42;
Step 220: swing CF signal and this input swinging signal of 42 outputs of cosine signal generator are multiplied each other via multiplier 44, to obtain a product signal;
Step 230: this product signal is added up at each clock via totalizer 46, to obtain a sum of products signal;
Step 240: use phase data processor 48 to judge that according to the positive negative value of this sum of products signal the phase place of this input swinging signal transfers, to obtain a phase-changing signal;
Step 250: judge whether this phase-changing signal represents an address date unit, if then carry out step 270; If not, then carry out step 251;
Step 251: carry out fuzzy comparison method, use address date cell detector 50 that this phase-changing signal and a plurality of address date kenel are compared, according in this a plurality of address date kenels with this phase-changing signal nearest like the address date kenel, determine the address date unit of this input swinging signal;
Step 260: whether find out with this phase-changing signal recently like address date kenel (only differing the value of a clock), if, then carry out step 270, if not, then carry out step 261;
Step 261: carry out relative figure comparison method, utilize address date cell detector 50 that this sum of products signal is sorted in the value of each clock, selecting the less clock of value of a plurality of these sum of products signals encodes, to obtain a synchronous kenel, compare with these a plurality of address date kenels again, determine the address date unit of this input swinging signal;
Step 270: the address date unit of exporting this input swinging signal.
Please refer to Figure 10, Figure 10 is the tables of data of experimental result of the present invention.The dissimilar discs of tables of data demonstration of Figure 10 is used the three kinds of resulting ADIP element failure of method scan light disc error numbers (ADIP unit lost error number) respectively under different conditions, wherein method one is for using the product accumulation method, method two is for using fuzzy comparison method, method three is for using fuzzy comparison method and relative figure comparison method simultaneously, and numeral more then represents error rate higher.By the data in the table as can be known, after using method two or the method three, the error rate of ADIP unit can obtain tangible improvement, and more is not subjected to the influence of noise of swinging signal own or distortion.It should be noted that, figure comparison method also can independently be used relatively, effect is similar with the fuzzy comparison method of use, but because figure comparison method must just can be judged after 8 clocks finish relatively, and fuzzy comparison rule is to compare simultaneously at 8 clocks, therefore best being combined as utilizes fuzzy comparison method to advance comparison earlier in 8 clocks, and fail to blur the swinging signal that the comparison method is judged, then after 8 clocks finish, judge with relative figure comparison method again, so can get minimum error rate, shown in the data of method three in the table.In addition, when fuzzy comparison method and when relatively figure comparison method all can't be judged the value of address date cell signal (ADIP_UNIT), then the address date cell signal can be labeled as the unknown (unknown) and give error-correcting code (ECC) block, carries out last error correction screening.
From the above, input swinging signal resulting sum of products signal after using the product accumulation method, be easy to judge the position of phase change, and can be used to determine to import the address date unit of swinging signal according to the phase-changing signal that the sum of products signal obtains, when the position judgment mistake of phase change, the invention provides fuzzy comparison method and relatively figure comparison method revise.Fuzzy comparison method and relatively the difference of figure comparison method be in, fuzzy comparison method utilizes the phase-changing signal of sum of products signal deciding to compare, and relatively figure comparison rule is by finding out the less clock position of relative value in the sum of products signal, and recompile is compared again.
Compared to known technology, fuzzy comparison method provided by the invention and relative figure comparison method can be improved the ability of the address date unit of judging swinging signal significantly, because the decoding of address date is extremely important for the read-write of DVD+R/RW discs, therefore, the present invention can effectively promote the ability that CD-ROM drive reads discs.
The above only is preferred embodiment of the present invention, and all equalizations of doing according to claim of the present invention change and modify, and all should belong to the covering scope of patent of the present invention.
Claims (8)
1. the interpretation method of the address date of a CD-ROM drive, be used for an input swinging signal is decoded as an address date cell signal, this CD-ROM drive comprises a phase lock circuitry, a cosine signal generator, a multiplier, a totalizer, a phase data processor and an address date cell detector, and this method comprises the following step:
(a) the swing CF signal with this phase lock circuitry output is converted to and the synchronous swing CF signal of this input swinging signal via this cosine signal generator;
(b) swing CF signal and this input swinging signal with this cosine signal generator output multiplies each other via this multiplier, to obtain a product signal;
(c) this product signal is added up at each clock via this totalizer, to obtain a sum of products signal;
(d) use this phase data processor to judge the phase place turnover of this input swinging signal, to obtain a phase-changing signal according to the positive negative value of this sum of products signal; And
(e) compare the value of this phase-changing signal and these a plurality of address date kenels in each clock one by one, when the address date kenel that has in these a plurality of address date kenels with the identical value of this phase-changing signal, then this address date kenel is added a counting, last to count maximum address date kenels as this address date cell signal.
2. the method for claim 1, wherein this CD-ROM drive is the DVD+R/RW CD-ROM drive, this address date is pre-ditch slot address.
3. one kind is decoded as the code translator of an address date cell signal with an input swinging signal, and it includes:
One phase lock circuitry is used for according to this input swinging signal output one swing CF signal;
One cosine signal generator is coupled to this phase lock circuitry, is used for this swing CF signal with the output of this phase lock circuitry to be converted to one and to swing CF signal with this input swinging signal synchronous;
One multiplier is coupled to this cosine signal generator, is used for this swing CF signal and this input swinging signal that this cosine signal generator is exported are multiplied each other, to obtain a product signal;
One totalizer is coupled to this multiplier, is used in each clock this product signal being added up, to obtain a sum of products signal;
One phase data processor is coupled to this totalizer, is used for judging according to the positive negative value of this sum of products signal the phase place turnover of this input swinging signal, to obtain a phase-changing signal; And
One address date cell detector, be coupled to this phase data processor, be used for comparing one by one the value of this phase-changing signal and these a plurality of address date type samples in each clock, when having an address date type sample to have identical value in these a plurality of address date type samples with this phase-changing signal, then this address date type sample is added a counting, last to count maximum address date type samples as this address date cell signal.
4. code translator as claimed in claim 3, it is applied to a CD-ROM drive.
5. code translator as claimed in claim 4, wherein this CD-ROM drive is that DVD+R/RW CD-ROM drive and this address date are pre-ditch slot address.
6. code translator as claimed in claim 5, it also includes:
One error-correcting code block is coupled to this address date cell detector, is used for producing a swinging signal address according to this address date cell signal.
7. code translator as claimed in claim 5, it also includes:
One writes clock generation circuit, is coupled to this phase lock circuitry, is used for writing the required clock signal of a discs according to this swing CF signal generation.
8. code translator as claimed in claim 5, it also includes:
One holding circuit is coupled to this phase lock circuitry and this address date cell detector, is used for producing various reference signals to avoid noise.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2003101202407A CN100338663C (en) | 2003-12-10 | 2003-12-10 | Method for decoding address data of optical drive |
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| CNB2003101202407A CN100338663C (en) | 2003-12-10 | 2003-12-10 | Method for decoding address data of optical drive |
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| CN 200710086203 Division CN101042883A (en) | 2003-12-10 | 2003-12-10 | Decoding method of CD ROM address and decoding device thereof |
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| CN100338663C true CN100338663C (en) | 2007-09-19 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003034413A1 (en) * | 2001-10-16 | 2003-04-24 | Koninklijke Philips Electronics N.V. | Disc driving device and wobble information detection method |
| JP2003346343A (en) * | 2002-05-28 | 2003-12-05 | Sony Corp | Demodulator, demodulation method, and recording and reproducing apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003034413A1 (en) * | 2001-10-16 | 2003-04-24 | Koninklijke Philips Electronics N.V. | Disc driving device and wobble information detection method |
| JP2003346343A (en) * | 2002-05-28 | 2003-12-05 | Sony Corp | Demodulator, demodulation method, and recording and reproducing apparatus |
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