CN100382191C - Optical drive capable of detecting and correcting double-phase data error - Google Patents
Optical drive capable of detecting and correcting double-phase data error Download PDFInfo
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- CN100382191C CN100382191C CNB2003101043256A CN200310104325A CN100382191C CN 100382191 C CN100382191 C CN 100382191C CN B2003101043256 A CNB2003101043256 A CN B2003101043256A CN 200310104325 A CN200310104325 A CN 200310104325A CN 100382191 C CN100382191 C CN 100382191C
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Abstract
The present invention relates to an optical drive which comprises an optical read head, an FM demodulator, a phase rule checker, a pair of phase data correctors, a pair of phase demodulators, a circulation redundancy checker and a multitask device, wherein the optical read head is used for reading radio frequency data on an optical disc, the FM demodulator is used for demodulating the radio frequency data into quarter-phase data, the phase rule checker is used for checking whether the bit phases of the quarter-phase data are in accordance with the rule that the phases at the edge of adjacent bits are definitely alien, the phase data correctors are used for generating a plurality of quarter-phase data with phases in accordance with the rule when bits of the quarter-phase data not in accordance with the rule are checked, the phase demodulators are used for demodulating the quarter-phase data into time data, the circulation redundancy checker is used for testing the time data, and the multitask device is used for outputting right time data according to the test result.
Description
Technical field
The present invention relates to a kind of CD-ROM drive, particularly a kind of can be before the quarter-phase data demodulates debug and change its data superfluous several detector that circulates after being beneficial to the method for exhaustion and detect the CD-ROM drive of correct data at once.
Background technology
When recordable CD of burning and repeatable read writing optical disk, must can judge the position of optical read/write head (optical pick-up unit) on CD by deciphering out time data (ATIP, Absolute Time In Pre-groove).In addition, time data is also put down in writing the special information (special information) and the additional information (additional information) of some relevant CDs, and the reference when burning is provided is used.
The raw data of time data need be through after the quarter-phase modulation, the form of groove (wobblegroove) with shake exists on the disc, passing through optical read head then, and radio frequency amplifier (RFAmplifier) obtains dither signal (Wobble signal).Passing through FM demodulator (FMDemodulator), quarter-phase detuner (Bi-phase demodulator) afterwards more just can the recovery time data, and the superfluous several inspection technique (CRC) that can circulate is simultaneously checked the correctness of data.Wherein the mistake of data the opportunity that produces may be from following several situations, damage because of CD during as the optical read head reading of data or the problem of laser intensity reads wrong data, data produce mistake or quarter-phase modulation mistake because be subjected to noise in the process of transmitting.When being checked through data generation mistake with the superfluous several inspection technique that circulates, prior art requires optical read head to read these data again without exception, again these data is reduced into time data via said process again.Yet Cuo Wu generation sometimes only is the mistake that is the quarter-phase modulation, in the case, require optical read head to read these data again, again these data are reduced into time data via said process again, do not revise at the reason that really makes the mistake.And after optical read head read these data again, these data might be separated timing in the process FM demodulator and be produced quarter-phase modulation mistake once again.
Summary of the invention
Therefore fundamental purpose of the present invention provides a kind of CD-ROM drive, and its correctness according to the quarter-phase data before quarter-phase detuner demodulation quarter-phase data is adjusted the quarter-phase data, to address the above problem.
Application claims of the present invention provide a kind of CD-ROM drive, it comprises an optical read head, be used for reading the rf data on the CD, one FM demodulator, be used for the rf data that this optical read head reads is demodulated into the quarter-phase data, a pair of phase rule detector, be connected in this FM demodulator, whether the phase place of each bit of the quarter-phase data that are used for checking that this FM demodulator transmits meets adjacent bit must be different rule in the phase place of edge, a pair of phase data corrector, be connected in this quarter-phase rule detector, be used for when this quarter-phase rule detector is checked through quarter-phase data that this FM demodulator transmits and has phase place and do not meet this regular bit, produce a plurality of phase places according to these quarter-phase data and this rule and all meet this regular quarter-phase data, the a pair of phase demodulator, be connected in this quarter-phase data modifier, the a plurality of quarter-phase data demodulates that are used for this quarter-phase data modifier is transmitted are a plurality of time datas, the superfluous several detectors of one circulation, be connected in this quarter-phase detuner, be used for testing a plurality of time datas that this quarter-phase detuner transmits, an and multiplexer, be connected in this quarter-phase detuner and this superfluous several detector that circulates, be used for a plurality of time datas that test result according to these superfluous several detectors that circulate transmits by this quarter-phase detuner to choose a correct time data.
Because the mistake of quarter-phase modulation can detect with a pair of phase rule detector, therefore can produce institute by the method for exhaustion and might be correct quarter-phase data, be sent to the inspection of the superfluous number mechanism of circulation again from all possible time data, to find out correct time data.Therefore claim of the present invention can promote the accuracy of time data effectively.
Description of drawings
Fig. 1 is the synoptic diagram of optical memory system among the present invention.
Fig. 2 is before the figure one FM demodulator demodulation and the synoptic diagram of the signal that produces after the demodulation.
The drawing reference numeral explanation
10 CD-ROM drives, 12 CDs
14 optical read heads, 16 radio frequency amplifier
18 FM demodulator, 22 quarter-phase detuners
The superfluous several detector 32 quarter-phases rule detectors of 24 circulations
34 quarter-phase data modifier, 36 data buffers
38 multiplexers
Embodiment
Please refer to Fig. 1, Fig. 1 is the synoptic diagram of CD-ROM drive 10 among the present invention.CD-ROM drive 10 includes a CD 12, an optical read head 14, a radio frequency amplifier 16, a FM demodulator 18, a pair of phase rule detector 32, a pair of phase data corrector 34, a pair of phase demodulator 22, a data buffer 36, superfluous several detectors 24 of circulation and a multiplexer 38.Optical read head 14 is responsible for reading the rf data that presents with the shake form of grooves on the CD 12, this rf data is passed toward radio frequency amplifier 16 to do the action of strengthening signal again.Radio frequency amplifier 16 amplifies after this rf data, by the mode of FM demodulator 18 with frequency modulation (Frequency modulation) demodulation, this rf data is demodulated into the quarter-phase data immediately, is sent to quarter-phase rule detector 32 again.Quarter-phase rule detector 32 is responsible for detecting these quarter-phase data, and comprises n bit edge and violate adjacent bit and must when regular, make quarter-phase data modifier 34 set up 2 of an existence in parallel for different in the phase place of edge in detecting these quarter-phase data
nIndividual different phase place all meets this regular quarter-phase data, thinks that the superfluous several detector 24 of circulation utilizes.2
nAfter individual quarter-phase data were set up, these were 2 years old
nIndividual quarter-phase data are sent to quarter-phase detuner 22 immediately and carry out quarter-phase and be demodulated to time data and be temporary in data buffer 36.At last, 2 in the data buffer 36
nIndividual time data enters the superfluous several detectors 24 of circulation respectively and carries out data check, and multiplexer 38 can be temporary in 2 of data buffer 36 according to result's output that the superfluous several detectors 24 of circulation are checked
nUnique correct time data in the individual time data outputs to this correct time data in the next unit again.
Please refer to Fig. 2, Fig. 2 is the synoptic diagram of the signal that produces after correct quarter-phase data and FM demodulator 18 demodulation.The raw data correspondence of Fig. 2 is without the data of quarter-phase modulation and frequency modulation modulation, the quarter-phase data that should produce of Fig. 2 are through the quarter-phase data after the quarter-phase modulation, meaning be after FM demodulator 18 demodulation the quarter-phase data that should produce, the quarter-phase data of the actual generation of Fig. 2 are the actual quarter-phase data that produce after FM demodulator 18 demodulation.
Quarter-phase demodulation principle is as follows: a bit (bit cell) comprises two quarter-phase positions, and when two quarter-phase generation signal level variation in the bit, the demodulation value of this bit is " 1 "; And in the middle of the bit when not having signal level variation, the demodulation value of this bit is " 0 ".In addition, signal level variation must take place in the edge of adjacent bit (edge).Because the value of bit A, the pairing raw data of D be " 1 ", therefore, shown in the dibit data that should produce of Fig. 2, bit A, D by FM demodulator 18 demodulation after, bit A, D centre should have signal level variation; And because the value of bit B, C, the pairing raw data of E be " 0 ", therefore shown in the dibit data that should produce of Fig. 2, bit B, C, E by FM demodulator 18 demodulation after, bit B, C, E centre should not have signal level variation.In addition, the dibit data that should produce of Fig. 2 have also shown that the edge of adjacent bit all should have the change of signal level.Yet by the dibit data of the actual generation of Fig. 2 as can be known, signal level variation not between bit B and the C, so quarter-phase rule detector 32 can judge that bit B and C may have wrong bit.Because leading edge and the trailing edge of bit A, D, E all have signal level variation, so quarter-phase rule detector 32 can judge that bit A, D, E are correct bit.
Owing to can't differentiate is that among two of bit B back one makes a mistake, or make a mistake in the last position among two of bit C, and because signal level variation must take place in the edge of adjacent bit, and the last position among two of bit B is " 1 ", back one in two of bit C is " 0 ", therefore quarter-phase data modifier 34 can produce the possible correct quarter-phase data 1010 and 1100 of two groups of bit B and C simultaneously, and send into quarter-phase detuner 22 and be demodulated to time data, and be temporary in data buffer 36.The superfluous several detector 24 that then circulates can be sent one according to the superfluous numerical value of correct circulation (being " 0 ") with these two groups of possible time datas and select signal to multitask device 38 to select last correct time data.If the superfluous numerical value of correct circulation shows that correct bit B and the quarter-phase data of C are 1010, then multiplexer 38 can be according to the quarter-phase data outputs " 11110 " of bit A to E; And if the superfluous numerical value of correct circulation shows that correct bit B and the quarter-phase data of C are 1100, then multiplexer 38 can be according to the quarter-phase data outputs " 10010 " of bit A to E.
In the present embodiment, the quarter-phase data have five bits, but in fact each quarter-phase data should have 14 bits, and it only is to explain orally for convenience that present embodiment uses five bits.In addition, in the present embodiment, have a quarter-phase position to make a mistake, so quarter-phase data modifier 34 produce two groups of possible quarter-phase data.Yet if there are two quarter-phase positions to make a mistake, then because each can't identification bit two possible numerical value are all arranged, quarter-phase data modifier 34 can produce four possible quarter-phase data, that is to say, if quarter-phase data have n quarter-phase position to make a mistake, then quarter-phase data modifier 34 can produce 2
nIndividual possible quarter-phase data.
Require to read again the way of optical disc data when only the time data after detecting demodulation has mistake compared to known technology, the present invention before the quarter-phase data are demodulated into time data, just begin to the quarter-phase data of mistake with the method for exhaustion enumerate might be correct quarter-phase data, so that the superfluous number of circulation is afterwards checked, corrigendum is used, so the accuracy rate of time data can therefore and significantly promote.
The above only is preferred embodiment of the present invention, and all equalizations of being done according to the present patent application claim change and modify, and all should belong to the covering scope of patent of the present invention.
Claims (7)
1. CD-ROM drive, it comprises:
One optical read head is used for reading the rf data on the CD;
One FM demodulator is used for the rf data that this optical read head reads is demodulated into the quarter-phase data;
A pair of phase rule detector is connected in this FM demodulator, and whether the phase place of each bit of the quarter-phase data that are used for checking that this FM demodulator transmits meets adjacent bit must be different rule in the phase place of edge;
A pair of phase data corrector, be connected in this quarter-phase rule detector, be used for being checked through quarter-phase data that this FM demodulator transmits and have phase place and do not meet this adjacent bit when the phase place of edge must be for the bit of different rule, produce a plurality of quarter-phase data that phase place all meets this rule according to these quarter-phase data and this rule in this quarter-phase rule detector;
The a pair of phase demodulator is connected in this quarter-phase data modifier, and a plurality of quarter-phase data demodulates that are used for this quarter-phase data modifier is transmitted are a plurality of time datas;
The superfluous several detectors of one circulation are connected in this quarter-phase detuner, are used for testing a plurality of time datas that this quarter-phase detuner transmits; And
One multiplexer is connected in this quarter-phase detuner and this superfluous several detector that circulates, and is used for a plurality of time datas that test result according to these superfluous several detectors that circulate transmits by this quarter-phase detuner to choose a correct time data.
2. CD-ROM drive as claimed in claim 1, it comprises a radio frequency amplifier in addition, is connected between this optical read head and this FM demodulator, is used for amplifying the rf data that this optical read head reads.
3. CD-ROM drive as claimed in claim 1, it comprises a data buffer in addition, is connected between this quarter-phase detuner and this multiplexer, is used for keeping in a plurality of time datas that this quarter-phase detuner transmits.
4. the method for a CD-ROM drive deal with data, it includes the following step:
(a) read rf data on the CD;
(b) rf data that reads is demodulated into the quarter-phase data;
(c) whether the phase place of checking each bit of these quarter-phase data meets adjacent bit and must be different rule in the phase place of edge;
(d) if when being checked through these quarter-phase data and having phase place and do not meet this regular bit, then produce a plurality of quarter-phase data that phase place all meets this rule according to these quarter-phase data and this rule;
(e) a plurality of quarter-phase data demodulates that step (d) is produced are a plurality of time datas;
(f) these a plurality of time datas of test; And
(g) choose a correct time data according to the test result of step (f) by these a plurality of time datas.
5. method as claimed in claim 4, it comprises amplification in addition and reads the obtained rf data of this CD.
6. method as claimed in claim 4, if it when being checked through these quarter-phase data and having phase place and do not meet this regular n bit edge, then all meets 2 of this rule according to these quarter-phase data and this rule generation phase place in step (d)
nIndividual different quarter-phase data.
7. method as claimed in claim 4, it is contained in temporary these a plurality of time datas in execution in step (e) back in addition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101043256A CN100382191C (en) | 2003-10-24 | 2003-10-24 | Optical drive capable of detecting and correcting double-phase data error |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101043256A CN100382191C (en) | 2003-10-24 | 2003-10-24 | Optical drive capable of detecting and correcting double-phase data error |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1609989A CN1609989A (en) | 2005-04-27 |
| CN100382191C true CN100382191C (en) | 2008-04-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2003101043256A Expired - Fee Related CN100382191C (en) | 2003-10-24 | 2003-10-24 | Optical drive capable of detecting and correcting double-phase data error |
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| CN (1) | CN100382191C (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5506824A (en) * | 1994-12-20 | 1996-04-09 | Eastman Kodak Company | Frequency modulation to biphase data conversion for writable CD ATIP data |
| CN1417779A (en) * | 2001-10-31 | 2003-05-14 | 松下电器产业株式会社 | Biphasic mark playback device and CD driver |
| JP2003162818A (en) * | 2001-11-26 | 2003-06-06 | Sony Corp | Optical recording medium device, method for recording optical recording medium, and method for reproducing optical recording medium |
-
2003
- 2003-10-24 CN CNB2003101043256A patent/CN100382191C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5506824A (en) * | 1994-12-20 | 1996-04-09 | Eastman Kodak Company | Frequency modulation to biphase data conversion for writable CD ATIP data |
| CN1417779A (en) * | 2001-10-31 | 2003-05-14 | 松下电器产业株式会社 | Biphasic mark playback device and CD driver |
| JP2003162818A (en) * | 2001-11-26 | 2003-06-06 | Sony Corp | Optical recording medium device, method for recording optical recording medium, and method for reproducing optical recording medium |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1609989A (en) | 2005-04-27 |
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Owner name: MEDIATEK INC. Free format text: FORMER OWNER: YANGZHI SCIENCE + TECHNOLOGY CO. LTD. Effective date: 20050325 |
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Effective date of registration: 20050325 Address after: Hsinchu Hsinchu Science Industrial Park, Taiwan County, China Applicant after: MediaTek.Inc Address before: Taipei County of Taiwan Province Applicant before: Yangzhi Science & Technology Co., Ltd. |
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