CN100369146C - Data regenerating method of optical disc prerecording zone and its device - Google Patents
Data regenerating method of optical disc prerecording zone and its device Download PDFInfo
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- CN100369146C CN100369146C CNB021480397A CN02148039A CN100369146C CN 100369146 C CN100369146 C CN 100369146C CN B021480397 A CNB021480397 A CN B021480397A CN 02148039 A CN02148039 A CN 02148039A CN 100369146 C CN100369146 C CN 100369146C
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- recording area
- area data
- prerecording zone
- flaw
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Abstract
The present invention provides a data regenerating method of an optical disc prerecording zone and a device of the method. The data regenerating method of an optical disc prerecording zone (BCA) comprises: receiving a radio frequency (RF) signal of the prerecording zone for generating a flaw signal which is used as a prerecording zone signal; sampling the prerecording zone signal according to a sampling time pulse for generating a prerecording zone data character string; realizing a decoding operation according to the prerecording zone data character string for generating prerecording zone data. The method uses the flaw signal as the prerecording zone signal, so that an extra prerecording zone signal acquisition device is not needed.
Description
Technical field
The present invention relates to a kind of renovation process and device thereof of CD pre-recording area data, particularly relate to and a kind ofly utilize flaw (defect) flaw signal that detecting device produced in the CD signal regeneration unit as CD prerecording zone (Burst Cutting Area, BCA) renovation process and the device thereof of the CD pre-recording area data of signal.
Technical field
Present digital video disk/digital versatile dish (Digital Video Disc/Digital Versatile Disc is hereinafter to be referred as DVD) comprises read-only DVD-ROM (Read Only Memory), single burning DVD-R (Recordable) and random access formula DVD-RAM (Random Access Memory).In the development of read-only DVD-ROM, described discs provides a prerecording zone, and (Burst Cutting Area BCA) comes burning data, uses on every discs and indicates individual information.As shown in Figure 1, the prerecording zone 11 of discs 10 is (+0/-0.4) mm to the 23.50 ± 0.5mm positions of counting 22.3 from the disc center.And the data burning method of prerecording zone is to utilize laser beam (laser beam) to remove the reflector layer (reflection film) of the subregion of described prerecording zone with radiation direction.Generally speaking, the data of prerecording zone are to utilize the modulation system of RZ (return to zero) to produce.Owing to had hole, illusory hole character string (Dummy Pit String) at original prerecording zone, so when optical head when reading pre-recording area data, resulting RF (radio frequency) signal is except striped (stripe) signal of prerecording zone, also comprise hole, high frequency hole character string signal, shown in Fig. 2 (A).
Figure 3 shows that the calcspar of traditional prerecording zone signal reproducing apparatus.The renovation process of traditional prerecording zone signal is to utilize the prerecording zone signal reproducing apparatus from the desired prerecording zone information of RF signal acquisition.As shown in Figure 3, the prerecording zone signal reproducing apparatus utilizes a peak detctor 31 to detect the peak value of RF signal.Because the RF signal is loaded with hole (Pit), high frequency hole signal, so high-frequency signal that must utilize low-pass filter (LPF) 32 to filter in the RF signal earlier, and utilize 33 pairs of RF signals of a cutting signal generator to produce a relative cutoff signal (slice signal), again two signals of handling are produced the prerecording zone signal via comparer (comparator) 34.But, because can being subjected to the mirror modulation (mirrormodulation) of prerecording zone, the RF signal produces DC-shift (DC wandering) phenomenon, and the radio-frequency component in the RF signal also is difficult for filtering fully, so traditional treatment method usually can't capture correct prerecording zone signal.
Summary of the invention
Because the problems referred to above, the testing circuit that the purpose of this invention is to provide a kind of utilization detection disc flaw (defect) produces the renovation process and the device thereof of the CD pre-recording area data of prerecording zone signal.
For reaching above-mentioned purpose, the renovation process of CD pre-recording area data of the present invention comprises the following step: radio frequency (the radio frequency that receives a prerecording zone, RF) signal to be producing a flaw signal (defectsignal), and with this flaw signal as a prerecording zone signal; According to a sampling clock described prerecording zone signal is taken a sample, to produce a pre-recording area data character string; And, carry out decode operation according to described pre-recording area data character string, to produce a pre-recording area data.
Therefore, the present invention utilizes flaw signal as the prerecording zone signal, so do not need extra prerecording zone signal acquisition device.
Description of drawings
The synoptic diagram of prerecording zone position in Fig. 1 display light disc.
Fig. 2 shows the RF signal and the prerecording zone signal of prerecording zone, and wherein Fig. 2 (A) is the RF signal, and Fig. 2 (B) is the prerecording zone signal.
Figure 3 shows that the calcspar of traditional prerecording zone signal reproducing apparatus.
Fig. 4 is the regenerating unit of CD pre-recording area data of the present invention.
Fig. 5 is an embodiment of the block scheme of Defect Detection unit.
Fig. 6 shows the sequential chart of flaw signal being taken a sample with suitable sampling clock.
Fig. 7 shows the process flow diagram of the renovation process of CD pre-recording area data of the present invention.
Each description of reference numerals in the accompanying drawing is as follows:
40 regenerating units, 45 decoding units
41 optical heads, 46 servo processors
42 signal amplifiers, 47 motor drivers
43 Defect Detection unit, 48 oscillators
44 sampling units, 49 frequency dividers
Embodiment
Renovation process and device below with reference to graphic detailed description CD pre-recording area data of the present invention.
Because the probability of discs scratch is very high, so the CD signal regenerating unit generally all can comprise a Defect Detection unit and detect disc flaw (scratch) zone, and further handles according to flaw signal, to obtain correct data.Defect Detection circuit main application is the natural scratch zone of detecting on the disc, produces corresponding flaw signal, and the servo processor (servo processor) that provides in the CD signal regenerating unit foundation as system protection is provided.The Defect Detection principle of described Defect Detection circuit is when optical head process defect areas, the ripple value of RF signal (ripple amplitude) can obviously be dwindled, so as long as compare the ripple value of RF signal and the signal difference of described RF signal process low-pass filter (LPF), just can judge the scratch zone, and produce flaw signal.Because the characteristics of signals and the disc scratch situation of prerecording zone are similar, that is Fig. 2 A is the RF signal of prerecording zone, not cheating the hole region of high frequency signals in the signal is the strip reflection horizon and is struck off part, so, utilize Defect Detection unit in the CD signal regenerating unit can isolate prerecording zone signal in the RF signal, as Fig. 2 B.The present invention is promptly according to described characteristic, and the Defect Detection circuit that utilizes the CD signal regenerating unit originally to be had produces the prerecording zone signal.
Fig. 4 is the regenerating unit of CD pre-recording area data of the present invention.Shown in the figure, the regenerating unit 40 of pre-recording area data is to be disposed in the optical disc access device 4 as described, and comprises a Defect Detection unit 43, a sampling unit 44, a decoding unit 45 and a frequency divider 49.Optical disc access device 4 utilizes the signal that is write down on an optical head 41 acquisition discs, and the signal that is captured is passed to signal amplifier 42.Signal amplifier 42 produces so-called RF signal after signal is amplified.When optical disc access device 4 will read pre-recording area data, described optical disc access device 4 can be urged to prerecording zone with optical head, and produced the RF signal of prerecording zone.
The regenerating unit 40 of pre-recording area data utilizes the RF signal of Defect Detection unit 43 reception prerecording zones, and produces flaw signal according to the ripple value of RF signal, and flaw signal is offered sampling unit 44 and servo processor 46.Servo processor 46 can because the processing of servo processor 46 is operating as known techniques, not explain at this according to the reference of flaw signal as system protection more.Sampling unit 44 is considered as the prerecording zone signal with described flaw signal after receiving flaw signal, and according to the sampling clock that frequency divider 49 the is produced prerecording zone signal of taking a sample, produces pre-recording area data character string (bit stream).Afterwards, decoding unit 45 can decode pre-recording area data according to described pre-recording area data character string.Because optical disc access device 4 has all possessed the Defect Detection unit, the flaw signal of therefore using CD signal regenerating unit of the present invention can use optical disc access device 4 originally to provide need not possess extra prerecording zone signal regeneration circuit, can reduce cost.
Fig. 5 is an embodiment of the block scheme of Defect Detection unit.Described Defect Detection unit comprises ripple value detecting device (ripple amplitude detector) 51, one low-pass filter 52 and the flaw decision unit 53 of a RF signal.Ripple value detecting device 51 produces the RFRP signal of the ripple value of representing the RF signal.Under the situation of normal tracking (tracking), the RFRP signal is almost kept the same size, just can dwindle when only running into defect areas.Low-pass filter 52 with the RFRP signal filtering after, produce the RFRPLPF signal.So, utilize flaw to determine unit 53 to compare the size of RFRP signal and RFRPLPF signal, can detect the defect areas of disc.So, as long as suitable setting flaw level (defectlevel) can obtain the flaw signal with respect to the prerecording zone signal.Certainly, the Defect Detection unit also can use other method to produce flaw signal, and can be applicable among the present invention.
Fig. 6 shows the sequential chart of flaw signal being taken a sample with suitable sampling clock.Prerecording zone sample of signal unit 44 receives flaw signal, and after according to a sampling clock described flaw signal being taken a sample, produces a prerecording zone character string.Pre-recording area data decoding unit 45 promptly carries out prerecording zone channels bits demodulation (channel bit demodulation), synchronous detection (sync detection), bug patch code (Error Correction Code) inspection and error-detecting code (Error Detection Code) according to described prerecording zone character string to be checked, and obtains being recorded in the pre-recording area data of disc.
In addition, be the demand in response to DVD high power speed acquisition pre-recording area data, the reference clock of the prerecording zone sample circuit in this device is provided through the frequency divider that can plan 49 by the running clock (XCK) that an oscillator 48 is produced.The relative reference clock of prerecording zone signal frequency different set captured pre-recording area data accurately when system can be according to different rotating speeds under various rotating speeds.For example running clock is 33.8688MHz, and under 1440RPM changes frequently (about 1Xs DVD), the channels bits time width of prerecording zone (channel bittime width) is 8.89us, and can be formulated for 301 this moment with frequency divider 49, produces the sampling clock of the frequency of 11.25kHz.And when under 2880RPM changes frequently, reading,, frequency divider 49 can be formulated for 150 because the channels bits time width shortens into 4.445us.This moment, the frequency of sampling clock approximately was 22.6kHz.Therefore, this device can correctly produce pre-recording area data under difference times speed.
Fig. 7 shows the process flow diagram of the renovation process of CD pre-recording area data of the present invention.The renovation process of CD pre-recording area data of the present invention comprises:
Step S702: beginning.
Step S704: the RF signal that reads prerecording zone.
Step S706: produce flaw signal.Relatively the ripple value signal of the RF signal of prerecording zone and the low-pass filter signal of described ripple value signal use producing a flaw signal as the prerecording zone signal.Owing in optical disc apparatus, had the Defect Detection unit, therefore can utilize flaw signal that described Defect Detection unit produced as the prerecording zone signal, and not need additionally to possess again the prerecording zone detecting unit.
Step S708: sampling.With a sampling clock described prerecording zone signal is taken a sample, produce the prerecording zone character string.
Step S710: decoding.Carry out the demodulation of prerecording zone channels bits, synchronous detection, bug patch code inspection and error-detecting code inspection according to the prerecording zone character string, obtain being recorded in the BCA data of disc.
Step S712: finish.
Though more than illustrate with embodiment and the renovation process and the device of CD pre-recording area data of the present invention therefore not limit scope of the present invention that only otherwise break away from main idea of the present invention, those skilled in the art can carry out various distortion or change.
Claims (7)
1. the renovation process of a CD pre-recording area data comprises the following step:
Produce a flaw signal according to the RF signal that is used to detect a prerecording zone, and with this flaw signal as a prerecording zone signal;
According to a sampling clock described prerecording zone signal is taken a sample, to produce a pre-recording area data character string; And
Carry out decode operation according to described pre-recording area data character string, to produce a pre-recording area data.
2. as the renovation process of claim 1 a described CD pre-recording area data, wherein said decode operation carries out channels bits demodulation, synchronous detection, bug patch code inspection and error-detecting code inspection to described pre-recording area data character string, to produce described pre-recording area data.
3. as the renovation process of claim 1 a described CD pre-recording area data, wherein in the step of described generation flaw signal, the ripple value signal of the described RF signal of more described prerecording zone and the low-pass filter signal of described ripple value signal use producing described flaw signal.
4. the regenerating unit of a CD pre-recording area data comprises:
One Defect Detection unit, in order to receiving a RF signal and to produce a flaw signal according to this RF signal, and with this flaw signal as a prerecording zone signal;
One sampling unit is taken a sample to described prerecording zone signal according to a sampling clock, to produce a pre-recording area data character string; And
One decoding unit carries out decode operation according to described pre-recording area data character string, to produce a pre-recording area data.
5. as the regenerating unit of claim 4 a described CD pre-recording area data, wherein said Defect Detection unit comprises:
One ripple value detecting device in order to receiving a RF signal, and produces the ripple value signal of described RF signal;
One low-pass filter is in order to the high frequency composition of the ripple value signal of the described RF signal of filtering; And
One flaw decision unit in order to the ripple value signal of more described RF signal and the ripple value signal of described filtered RF signal, and produces described flaw signal.
6. as the regenerating unit of claim 4 a described CD pre-recording area data, also comprise a frequency divider, described frequency divider receives a reference clock, and produces described sampling clock.
7. as the renovation process of claim 4 a described CD pre-recording area data, wherein said decoding unit carries out channels bits demodulation, synchronous detection, bug patch code inspection and error-detecting code inspection with described pre-recording area data character string, to produce described pre-recording area data.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021480397A CN100369146C (en) | 2002-10-21 | 2002-10-21 | Data regenerating method of optical disc prerecording zone and its device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021480397A CN100369146C (en) | 2002-10-21 | 2002-10-21 | Data regenerating method of optical disc prerecording zone and its device |
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| CN1492428A CN1492428A (en) | 2004-04-28 |
| CN100369146C true CN100369146C (en) | 2008-02-13 |
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| CNB021480397A Expired - Fee Related CN100369146C (en) | 2002-10-21 | 2002-10-21 | Data regenerating method of optical disc prerecording zone and its device |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1173648A (en) * | 1997-08-29 | 1999-03-16 | Toshiba Corp | Device and method for reproducing disk |
| US6034937A (en) * | 1997-01-10 | 2000-03-07 | Sony Corporation | Optical disc reproduction method and optical disc reproduction apparatus |
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2002
- 2002-10-21 CN CNB021480397A patent/CN100369146C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6034937A (en) * | 1997-01-10 | 2000-03-07 | Sony Corporation | Optical disc reproduction method and optical disc reproduction apparatus |
| JPH1173648A (en) * | 1997-08-29 | 1999-03-16 | Toshiba Corp | Device and method for reproducing disk |
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| CN1492428A (en) | 2004-04-28 |
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