CN1560864A

CN1560864A - Defect signal detection device and method

Info

Publication number: CN1560864A
Application number: CNA2004100078661A
Authority: CN
Inventors: 欧阳世龙; 赖义麟; 胡培杰
Original assignee: Via Technologies Inc
Current assignee: Via Technologies Inc
Priority date: 2004-03-03
Filing date: 2004-03-03
Publication date: 2005-01-05
Anticipated expiration: 2024-03-03
Also published as: CN100401416C

Abstract

The invention is a flaw signal detecting device and the method. It presets a pit length range; inputs a digital signal containing several pits with different lengths; the digital signal is converted in NRZ signal, calculates the pit length of each pit; calculates the times that the pit length within the preset pit length range, and the times the length surpasses the range, when one accumulative times reach the preset limit value, ignites a flaw flag signal as the logic high level or the logic low level. The invention also provides a device for detecting the flaw signal.

Description

Flaw signal pick-up unit and method

Technical field

The present invention is a device and method about the optical disk system data detection signal, particularly is relevant to the device and method that an optical disk system detects defect of optical disc (defect) signal.

Background technology

Appearance along with light memory medium, store the thing that huge data no longer are the part difficulties, and since the mode of light memory medium storage data be with the digital mode imprinting on light memory medium, therefore utilize the simulation storing mode of magnetic compared to tradition, more can keep data-signal for a long time, data-signal can the distortion to some extent because of the time simultaneously.

The specification of light memory medium was formulated (Red Book Red Book) as far back as 1980 by Philip and Sony two companies, after this, in order to adapt to the difference of storage data content, many other specification (as: yellow book Yellow Book, Orange Book Orange Book have also been formulated successively ... Deng), the form of but on the whole going up the light memory medium data storing is roughly the same, and serves as to extend the basis with the earliest Red Book.

Data-signal in being stored in light memory medium before, must be earlier through modulation.To CD (compact dick, CD), data-signal must be earlier through 8 to 14 modulations (Eight toFourteen Modulation, EFM), and the data behind the modulation are a succession of by logic " 1 " and logic " 0 " combine the position (binary) signal, if but directly these signals are write in the CD, because the length in each hole, hole approximately has only 0.13 μ m～0.15 μ m, therefore the read head (pickup head) of optical disk system also can't read out the logic level state of each accurately, so the data-signal behind the modulation must arrive 11T (3T with 3T respectively, 4T, 5T, 6T, 7T, 8T, 9T, 10T, the hole, hole that 11T) is uneven in length (pit or land) (shown in Figure 1A) form coding and being stored in the CD, and this 3T to 11T promptly so-called (2,10) RLL (RunLength Limited) coding (shown in Figure 1B).That is to say, the spiral trajectory that data track in the CD is made up of the hole, hole of these 9 kinds of different lengths, as shown in Figure 2,2A is the wherein one piece of data signal of data of optical disk track, optical pickup reflects RF signal 2B by the data-signal 2A on scanning (tracking) data track, and 2C is corresponding data signal 2A (2,10) the non-return-to-zero signal of rll encoder (NRZ signal), because the RF signal amplitude intensity that the position, hole, hole that length is different reflects can be different, so system can be according to the size of oscillator intensity and interpretation goes out each stroke count number of it is believed that.Presentation logic during the accurate conversion in NRZ signal logic position (the logic high standard is converted to the logic low level, or the logic low level is converted to the logic high standard) in the 2C wherein " 1 ", and logic level presentation logic when remaining unchanged " 0 ".

Identical, digital versatile disc (digital versatile disc, DVD) also be profit in the same way, after earlier data-signal will being crossed 8 to 16 modulations (EFM plus), adding a 14T component in addition with 3T to 11T respectively, behind the hole, hole that formation is uneven in length, be stored in the digital versatile disc.

For CD; though there is the protection of one deck plastic layer on the surface; but CD still might because scratch and or some external factors; as imprinting process or fingerprint ... etc. factor; make data-signal produce flaw (defect); therefore flaw signal can make can't reflect correct RF signal when optical pickup follows rail, make the desired data-signal that reads out that optical disk system can't be correct, and then has produced misoperation.

Because the existence of flaw signal, can make the RF signal produce irregular variation, therefore the mode that generally is used for detecting flaw signal as shown in Figure 3, utilization adds a reference voltage (reference voltage level) 3B on the RF signal 3A of data-signal reflection, when the position of envelope (envelop) the signal 3C of RF signal accurate during less than reference voltage 3B (shown in the 3E zone of Fig. 3), then flaw flag (defect flag) signal 3D is pulled to the logic high standard by the logic low level, in order to indicating this 3E zone for the zone of flaw signal to be arranged, and the servo-control system (servo system) of informing optical disk system not to this regional frequency locking to avoid producing mistake.

If but the flaw signal of CD is when being not very serious (for example: the slight scratch or the flaw that vestige caused of fingerprint), if still utilize above-mentioned method, then may be by the correct position of finding out flaw signal in the RF signal of data-signal reflection, this situation as shown in Figure 4, the position standard of envelope signal 4C that the part (shown in the 4E zone of Fig. 4) that flaw signal exists is arranged among the RF signal 4A is on the contrary than reference voltage 4B height, thus, just can't find out the position of flaw signal in the RF signal by reflection, and the appearance that reflects flaw signal that flaw flag signals 4D just can't be correct.

Summary of the invention

The invention provides a kind of device and method that detects flaw signal, can so that optical disk system can be correct the part of finding out flaw signal in the CD, produced misoperation to avoid optical disk system because reading data-signal defective.

The device that the present invention detects flaw signal includes: a memory buffer, and in order to store the data of optical disk signal, wherein each stroke count number of it is believed that includes several holes, hole that is uneven in length; One first counter is in order to calculate the length in each hole, hole; One second counter, the length of totally cheating the hole are between a default number of times of cheating in the length range of hole, and the value that will add up and a corresponding preset threshold value comparison; One the 3rd counting unit, include a plurality of the 3rd counters, each the 3rd counter all has hole, the hole length range of a correspondence, the length of totally cheating the hole respectively exceeds default hole hole length range and the number of times in the signal length scope of the hole of each correspondence, simultaneously, each the 3rd counter also has a corresponding preset threshold value, in order to respectively with corresponding cumulative number value relatively; One flaw signal testing circuit produces a flaw flag signals, and according to second counter and a plurality of the 3rd counter cumulative number and corresponding default threshold value result relatively, changes its logic level.

The method that the present invention detects flaw signal includes: hole, default hole length range; Next imports a stroke count number of it is believed that, and this stroke count number of it is believed that includes the hole, hole that several are uneven in length; Then, convert data-signal to the NRZ signal, calculate hole, the hole length in each this hole, hole respectively; And totally cheat the number of times of hole length in the length range of hole, default hole respectively, and hole, hole length exceeds the outer number of times of default hole hole length range, when the number of times of one of them accumulative total reached the corresponding preset threshold value, triggering a flaw flag signals was logic high standard or logic low level.

Description of drawings

Figure 1A is hole, hole length synoptic diagram;

Figure 1B is hole, hole length synoptic diagram;

Fig. 2 is the data of optical disk signal schematic representation;

Fig. 3 is that prior art is in order to detect the flaw signal synoptic diagram;

Fig. 4 is that prior art is in order to detect the flaw signal synoptic diagram;

Fig. 5 detects the flaw signal installation drawing for the present invention;

Fig. 6 detects the flaw signal process flow diagram for the present invention;

Fig. 7 is applied to a disc accessing figure for the present invention;

Fig. 8 reads process flow diagram for the present invention is applied to a CD;

Fig. 9 is applied to an optical disc reading signal synoptic diagram for the present invention.

Symbol description among the figure:

2A, 9A data-signal 2B, 3A, 4A RF signal

2C (2,10) RLL signal 3B, 4B reference voltage

3C, 4C RF signal envelope 3D, 4D flaw flag signals

3E, 4E, 9C flaw signal zone 9B NRZ signal

500,700 flaw signal pick-up units, 510,710 memory buffer

520,720 first counters, 530,730 second counters

540,740 the 3rd counting units, 550,750 flaw signal testing circuits

DEF_FLAG flaw flag signals

CNT1, CNT2, CNT3 cumulative number value

SHR1, SHR2, the corresponding default threshold value of SHR3

D (P ₀, P ₁, P ₂P _N-1) data-signal

(L ₀, L ₁, L ₂L _N-1) hole, hole length

Hole, the default hole of RANGE length range

610 default RANGE

620 input D (P ₀, P ₁, P ₂P _N-1)

630 D (P ₀, P ₁, P ₂P _N-1) change into the NRZ signal

640 default DEF_FLAG are first logic level

642 default M=0, CNT2=0, CNT3=0 (CNT3_1, CNT3_2 ...)

650 calculate M pen hole hole P _MLength L _MWhether 660 DEF_FLAG are first logic level

670 L _MWhether fall among the RANGE

672 find out hole, corresponding hole length L _MOne of them counter (540_J) of scope, and the cumulative number value CNT3_J of this one the 3rd counter 540_J added 1 (CNT3_J=CNT_J+1)

Whether 674 CNT3_J reach corresponding SHR3_J

676 DEF_FLAG are pulled to second logic level

680 L _MWhether fall among the RANGE

682?CNT2＝CNT2+1；

Whether 684 CNT2 reach SHR2

686 DEF_FLAG are pulled to first logic level

690?M＝M+1

Whether 692 M equal N

694 reset all counters

810 default RANGE are 3T～11T

820 input D (P ₀, P ₁, P ₂P _N-1)

830 D (P ₀, P ₁, P ₂P _N-1) convert the NRZ signal to

840 DEF_FLAG are the logic low level

842 default M=0, CNT2=0, CNT3_1=0, CNT3_2=0, CNT3_3=0

850 calculate M pen hole hole P _MLength L _M

Whether 860 DEF_FLAG are the logic low level

870 L _MWhether fall within RANGE (among=3T～11T)

871 L _MWhether less than 3T

872?CNT3_1＝CNT3_1+1

Whether 873 CNT3_1 reach SHR3_1

874 L _MWhether greater than 18T

875?CNT3_3＝CNT3_3+1

Whether 876 CNT3_3 reach SHR3_3

877?CNT3_2＝CNT3_2+1

Whether 878 CNT3_2 reach SHR3_2

879 DEF_FLAG are pulled to the logic high standard

880 L _MWhether fall within RANGE (among=3T～11T)

882?CNT2＝CNT2+1

Whether 884 CNT2 reach SHR2

886 DEF_FLAG are pulled to the logic low level

890?M＝M+1

892 judge whether M equals N

894 reset all counters

Embodiment

The invention provides a kind of device and method that detects flaw signal, what make that optical disk system can be correct detects flaw signal in the CD.Below will enumerate preferred embodiment in order to explanation the present invention, know that all this only is an explanation for example yet know this skill person, and be not that the preferred embodiment enumeration of relevant this invention is as follows in order to qualification invention itself.

As shown in Figure 5, the device 500 that the present invention detects flaw signal includes: a memory buffer 510, and in order to store the optical disc data signal, wherein each stroke count number of it is believed that includes several holes, hole that is uneven in length; One first counter 520 is linked to memory buffer 510, in order to calculate the length in each hole, hole in the memory buffer 510; One second counter 530, be linked to first counter 520, calculate the number of times of length in the length range of hole, a default hole in hole, hole in order to each accumulative total first counter, and value CNT2 and corresponding preset threshold value SHR2 of this accumulative total compared; One the 3rd counting unit 540, include several the 3rd counters (540_1,540_2,), be attached to first counter 520 simultaneously, and each the 3rd counter (540_1,540_2,) all have a correspondence to exceed hole, the hole length range of hole, default hole length range respectively, in order to add up the number of times (CNT3_1 in each hole, corresponding hole length range respectively, CNT3_2,), simultaneously, each the 3rd counter (540_1,540_2,) a corresponding preset threshold value (SHR3_1 also arranged respectively, SHR3_2,), in order to respectively with corresponding cumulative number value (CNT3_1, CNT3_2,) relatively; One flaw signal testing circuit 550, produce a flaw flag signals DEF_FLAG who is preset as first logic level, this flaw flag signals DEF_FLAG can be according to the cumulative number CNT2 and the (CNT3_1 of second counter 530 and the 3rd counting unit 540, CNT3_2,) with corresponding default threshold value SHR2 and (SHR3_1, SHR3_2,) relatively result, change its logic level, that is to say, if the logic level of flaw flag signals DEF_FLAG (is assumed to be low logic level when being first logic level of presetting, that is logical zero), if when having judged flaw signal and having existed, then the logic level of flaw flag signals DEF_FLAG becomes second logic level (be assumed to be high logic level, that is logical one).

The method that the present invention detects flaw signal includes: hole, default hole length range; Secondly, import the stroke count number of it is believed that a D (P ₀, P ₁, P ₂P _N-1) to memory buffer 510, and this stroke count number of it is believed that D (P ₀, P ₁, P ₂P _N-1) include N the hole hole; A default flaw flag signals DEF_FLAG is in order to indicate this stroke count number of it is believed that D (P ₀, P ₁, P ₂P _N-1) in whether the existence of flaw signal is arranged, and default first logic level (when not having flaw signal to exist) that maintains of flaw flag signals DEF_FLAG; The data-signal that will include hole, N hole changes into the NRZ signal, utilizes first counter 520 to calculate the length (L in each hole, hole respectively according to the order in hole, hole again ₀, L ₁, L ₂L _N-1), afterwards according to result calculated, output to respectively in the counter of corresponding scope, that is to say, utilize second counter 530 to add up hole, hole length between default number of times (CNT2) of cheating the hole length range, perhaps utilize the 3rd counting unit 540 each the 3rd counter (540_1,540_2 ...) add up respectively and cheat the number of times in the length range of hole, default hole of hole length, and each the 3rd counter (540_1,540_2 ...) hole, pairing hole length range number of times (CNT3_1, CNT3_2 ...); Each relatively accumulative frequency value CNT2 and (CNT3_1, CNT3_2 ...) and corresponding preset threshold value SHR2 and (SHR3_1, SHR3_2 ...), when the accumulative frequency value reaches default threshold value, the position standard that then changes flaw flag signals DEF_FLAG (if the position standard of flaw flag signals DEF_FLAG is first logic level, is then changed into second logic level; Otherwise,, then change into first logic level if the position standard of flaw flag signals DEF_FLAG is second logic level); After the length in each hole, hole of data-signal all totally finishes, reset the cumulative number value of all counters.And when optical disk servo-system detected flaw flag signals DEF_FLAG logic level and changes, promptly whether frequency locking (suppose, if first logic level of flaw flag signals DEF_FLAG for presetting, then optical disk servo-system frequency locking according to the State Control of logic level; Otherwise, if flaw flag signals DEF_FLAG is second logic level, optical disk servo-system frequency locking not then).

Can find that wherein accumulative frequency value CNT2 conforms with the number of times of hole, default hole length range for Qi Keng hole length in several holes, hole of accumulative total.If accumulative frequency value CNT2 threshold value SHR2 default with it than than the result, then be can be used as whether flaw flag DEF_FLAG signal is returned to the standard of presetting first logic level by second logic level, uses indicating data-signal D (P ₀, P ₁, P ₂P _N-1) in do not have flaw signal to occur part.Wherein if flaw flag signals DEF_FLAG has been the first default logic level, even then accumulative frequency value CNT2 reaches default threshold value SHR2, then the position standard of flaw flag signals DEF_FLAG still maintains default first logic level.

And wherein can also find several accumulative frequency values (CNT3_1, CNT3_2 ...) (for example: greater than hole, default hole length range, or less than hole, default hole length range do not conform with the number of times of several situations of hole, default hole length range for Qi Keng hole length in several holes, hole of accumulative total ... Deng).If with the accumulative frequency value (CNT3_1, CNT3_2 ...) corresponding with it respectively default threshold value (SHR3_1, SHR3_2 ...) compare than the result, whether then can be used as flaw flag DEF_FLAG signal is pulled to the standard of second logic level by default first logic level, use indicating data-signal D (P ₀, P ₁, P ₂P _N-1) in have flaw signal to occur part.Wherein if flaw flag signals DEF_FLAG has been second logic level, even then the accumulative frequency value (CNT3_1, CNT3_2 ...) one of them reached corresponding default threshold value (SHR3_1, SHR3_2 ...), then the position standard of flaw flag signals DEF_FLAG still maintains second logic level.

Its method is as shown in Figure 6:

610: a default hole hole length range RANGE;

620: input includes the data-signal D (P in several holes, hole ₀, P ₁, P ₂P _N-1);

630: with data-signal D (P ₀, P ₁, P ₂P _N-1) change into the NRZ signal;

640: a default flaw flag signals DEF_FLAG is first logic level;

642: default M=0, CNT2=0, CNT3=0 (CNT3_1, CNT3_2 ...);

650: calculate M pen hole hole P _MLength L _M

660: judge whether flaw flag signals DEF_FLAG is first logic level;

If then execution in step 670, otherwise then execution in step 680;

670: judge hole, hole length L _MWhether fall among the default hole hole length range RANGE;

If then execution in step 690, if not, then execution in step 672;

672: in several the 3rd counters of the 3rd counting unit 540 (540_1,540_2 ...) find out hole, corresponding hole length L _MOne of them counter (540_J) of scope, and the cumulative number value CNT3_J of this one the 3rd counter 540_J added 1 (CNT3_J=CNT_J+1);

674: judge whether CNT3_J reaches corresponding preset threshold value SHR3_J;

If then execution in step 676, otherwise then execution in step 690;

676: DEF_FLAG is pulled to second logic level with the flaw flag signals, skips to step 690;

680: judge hole, hole length L _MWhether fall among the default hole hole length range RANGE;

If then execution in step 682, if not, then execution in step 690;

The cumulative number value CNT2=CNT2+1 of 682: the second counters 530;

Whether 684:CNT2 reaches the default threshold value SHR2 of second counter 530;

If then execution in step 686, otherwise then execution in step 690;

686: DEF_FLAG is pulled to first logic level with the flaw flag signals, skips to step 690;

690:M=M+1 gets back to step 650;

692: judge whether M equals N;

If then execution in step 694, otherwise then execution in step 692; And

694: reset all counters, get back to step 620.

The length of each frame signal is 588T in the known optical disc, and the length range in each hole, hole is 3T～11T, at the example of this measure one optical disk servo-system.As above chat, the present invention is applied to the device 700 (as shown in Figure 7) that an optical disk servo-system detects a defect of optical disc signal, include: a memory buffer 710, in order to store optical disc data signal D, wherein data-signal D includes N hole, hole (P that is uneven in length ₀, P ₁, P ₂P _N-1); One first counter 720 is linked to memory buffer 710, in order to calculate each hole, hole (P ₀, P ₁, P ₂P _N-1) length (L ₀, L ₁, L ₂L _N-1); One second counter 730 is linked to first counter 720, calculates the length (L in hole, hole in order to each accumulative total first counter ₀, L ₁, L ₂L _N-1) between a default hole hole length range RANGE (number of times among the 3T～11T), and with a value CNT2 and a corresponding preset threshold value SHR2 comparison of this accumulative total; One the 3rd counting unit 740, include three the 3rd counters (740_1,740_2,740_3), be attached to first counter 720 simultaneously, and each the 3rd counter (740_1,740_2,740_3) all has hole, the hole length range of a correspondence respectively, exceed default hole hole length range RANGE (3T～11T) but the number of times in the signal length scope of the hole of each correspondence (CNT3_1, CNT3_2, CNT3_3) in order to totally to cheat hole length respectively, that is first the 3rd counter 740_1 accumulative total is cheated hole length (L ₀, L ₁, L ₂L _N-1) in less than the number of times CNT3_1 of default hole hole length range RANGE (that is less than 3T), second the 3rd counter 740_2 then totally cheats hole length (L ₀, L ₁, L ₂L _N-1) greater than the number of times CNT3_2 of default hole hole length range RANGE (that is greater than 11T), the 3rd the 3rd counter 740_3 then totally cheats hole length (L ₀, L ₁, L ₂L _N-1) much larger than presetting hole hole length range RANGE (that is much larger than 11T, for example: number of times CNT3_3 18T), in addition, each the 3rd counter (740_1,740_2,740_3) also has a corresponding preset threshold value (SHR3_1, SHR3_2, SHR3_3) respectively, in order to respectively with corresponding cumulative number value (CNT3_1, CNT3_2, CNT3_3) relatively; An and flaw signal testing circuit 750, produce a flaw flag signals DEF_FLAG who is preset as the logic low level, cumulative number CNT2 and (CNT3_1, CNT3_2, CNT3_3) and corresponding default threshold value SHR2 and (SHR3_1, SHR3_2, SHR3_3) result relatively according to second counter 730 and the 3rd counting unit 740 change its logic level.

The present invention is applied to method that an optical disk servo-system detects a defect of optical disc signal as shown in Figure 8:

810: default hole hole length range RANGE is 3T～11T;

820: input includes the data-signal D (P in several holes, hole ₀, P ₁, P ₂P _N-1);

830: with data-signal D (P ₀, P ₁, P ₂P _N-1) convert the NRZ signal to;

840: a default flaw flag signals DEF_FLAG is the logic low level;

842: default M=0, CNT2=0, CNT3_1=0, CNT3_2=0, CNT3_3=0;

850: calculate M pen hole hole P _MLength L _M

860: judge whether flaw flag signals DEF_FLAG is the logic low level;

If then execution in step 870, otherwise then execution in step 880,

870: judge hole, hole length L _MWhether fall within default hole hole length range RANGE (among=3T～11T);

If then execution in step 890, if not, then select execution in step 871 according to hole, hole length;

871: judge hole, hole length L _MWhether less than 3T,

If then execution in step 872, on the contrary execution in step 874 then

872: the cumulative number value CNT3_1 of first the 3rd counter 740_1 adds 1 that is CNT3_1=CNT3_1+1, then execution in step 873;

873: judge whether CNT3_1 reaches default threshold value SHR3_1;

If then execution in step 879, on the contrary execution in step 890 then;

874: judge hole, hole length L _MWhether greater than 18T;

If, execution in step step 875 then, otherwise execution in step 877 then;

The cumulative number value CNT3_3 of 875: the three the 3rd counter 740_3 adds 1 that is CNT3_3=CNT3_3+1, then execution in step 876;

876: judge whether CNT3_3 reaches default threshold value SHR3_3;

If then execution in step 879, on the contrary execution in step 890 then;

The cumulative number value CNT3_2 of 877: the second the 3rd counter 740_3 adds 1 that is CNT3_2=CNT3_2+1, then execution in step 878;

878: judge whether CNT3_2 reaches default threshold value SHR3_2;

If then execution in step 879, on the contrary execution in step 890 then;

879: DEF_FLAG is pulled to the logic high standard with the flaw flag signals, skips to step 890;

880: judge hole, hole length L _MWhether fall within default hole hole length range RANGE (among=3T～11T);

If then execution in step 882, if not, then execution in step 890,

The cumulative number value CNT2=CNT2+1 of 882: the second counters 730;

Whether 884:CNT2 reaches the default threshold value SHR2 of second counter 730;

If then execution in step 886, otherwise then execution in step 890,

886: DEF_FLAG is pulled to the logic low level with the flaw flag signals, skips to step 890;

890：M＝M+1；

892: judge whether M equals N;

If then execution in step 894, otherwise then execution in step 850; And

894: reset all counters, get back to step 820.

By on chat, as shown in Figure 9,9A one includes the data-signal of flaw signal, 9B is corresponding NRZ signal, 9C is the flaw flag signals, when flaw flag signals 9C is that the logic low level is punctual, only calculate hole, hole length and violate the number of times of 3T～11T nrz encoding, therefore if when having hole, hole length to occur reaching default threshold value SHR3_1 or SHR3_2 among the regional 9E less than 3T or greater than the number of times of 11T, or when as long as the situation greater than 18T appears once in hole hole length, just flaw flag signals DEF_FLAG is pulled to the logic high standard, in order to inform optical disk servo-system lock stop audio data signal (for flaw signal); Otherwise, when the flaw flag signals is that the logic low level is punctual, only calculate the number of times that hole, hole length conforms with 3T～11T nrz encoding, that is, if among the 9F, the number of times accumulative total that hole, hole length conforms with 3T～11T nrz encoding reaches when presetting threshold value SHR2, then flaw flag signals DEF_FLAG is pulled to the logic low level by the logic high standard, begins the frequency locking data-signal with the notice optical disk servo-system.

Though the CD outermost layer has the data in the plastic layer protection CD; but inevitably; data in the CD still might cause data to produce flaw because of neglectful scratch or the factor that some are external; if optical disk servo-system does not have the correct existence that detects these flaw signal; then may cause the mistake when reading, perhaps further make optical disk servo-system produce misoperation.

As above chat, the invention provides device and method that a kind of flaw signal detects, make that optical disk servo-system can not need to have judged whether that by the mode of external dc reference voltage flaw signal exists.Device and the method for utilizing flaw signal of the present invention to detect can be controlled its lock rail whether foundation in order to be used as optical disk servo-system so that optical disk servo-system is very quick and the efficient place of finding out flaw signal in the CD.

Though the present invention illustrates as above with the preferable implementation column that is applied to optical disk servo-system and reads a data of optical disk, yet it is not in order to limit spirit of the present invention and the above embodiments.The present invention can be contained in the data of optical disk pattern of any kind of, as digital multifunctional optical disk data pattern etc., all is encompassed among the spirit of the present invention.At this, do not break away from the modification of being done in spirit of the present invention and the scope, all should be included in the claim of the present invention.

Claims

1. flaw signal detection method includes:

Hole, default hole length range;

Import a data-signal, wherein this data-signal includes hole, complex hole;

Convert this data-signal to the non-return-to-zero signal;

Cheat hole, the hole length in each this hole, hole of order computation in hole according to this at every turn; And

This hole, hole length of each accumulative total is between the number of times of this hole, default hole length range, and this hole, hole length exceeds the number of times of this hole, default hole length range;

Wherein when the result of the number of times of this accumulative total reaches corresponding one default threshold value, then trigger a flaw flag signals, wherein this flaw flag signals is preset as first logic level.

2. flaw signal detection method as claimed in claim 1 wherein when this hole, hole length this cumulative number value in this hole, default hole length range reaches the corresponding first default threshold value, then triggers this flaw flag signals and is this second logic level.

3. flaw signal detection method as claimed in claim 1 wherein when this hole, hole length reaches the corresponding second default threshold value greater than this cumulative number of this hole, default hole length range, then triggers this flaw flag signals and is this first logic level.

4. flaw signal detection method as claimed in claim 1 wherein when this hole, hole length reaches the corresponding the 3rd default threshold value less than this cumulative number of this hole, default hole length range, then triggers this flaw flag signals and is this first logic level.

5. flaw signal detection method as claimed in claim 1, wherein more comprise a length value much larger than this hole, default hole length range maximum permissible value is set, when a plurality of should one of them hole, hole length of holes, hole during greater than this length value, then trigger this flaw flag signals and be this first logic level.

6. flaw signal detection method as claimed in claim 1 wherein when this flaw flag signals triggers, is reseted each this cumulative number.

7. flaw signal pick-up unit includes at least:

One memory buffer, in order to receive a data-signal, wherein this data-signal includes hole, complex hole;

One first counter is linked to this memory buffer, in order to according to a plurality of orders of being somebody's turn to do the hole, hole, calculates wherein hole, the hole length that should cheat the hole at every turn;

One second counter is linked to this first counter, and in order to a plurality of number of times of hole, hole length in the length range of hole, a default hole that should cheat the hole of accumulative total, and corresponding default threshold value with relatively;

A plurality of the 3rd counters, be linked to this first counter, the number of times that exceeds this hole, default hole length range in order to hole, the hole length in a plurality of these holes, hole of accumulative total, wherein, each the 3rd counter all has hole, the hole length range of a correspondence, in order to adding up the number of times of a plurality of these holes, hole in this hole, hole length range of each correspondence respectively, and corresponding with one respectively default threshold value relatively;

One flaw flag signals produces circuit, be linked to this memory buffer, this second counter, and a plurality of the 3rd counters, in order to produce the flaw flag signals of first logic level of presetting, and according to the cumulative number of this second counter and these a plurality of the 3rd counters and corresponding should comparing than the result by default threshold value, triggering its logic level is one first logic level or one second logic level.

8. the described flaw signal pick-up unit of claim 7, wherein when this hole, hole length when this cumulative number of this hole, default hole length range reaches the corresponding first default threshold value, then trigger this flaw flag signals and be this second logic level.

9. the described flaw signal pick-up unit of claim 7, wherein these a plurality of the 3rd counters include at least: this hole, hole length of accumulative total is greater than the counter of this hole, default hole length range, and one this hole hole length of accumulative total less than the counter of this hole, default hole length range, and this hole, hole length of an accumulative total is much larger than in the counter of this hole, default hole length range maximum permissible value.

10. the described flaw signal pick-up unit of claim 9 wherein when this hole, hole length reaches the corresponding second default threshold value greater than this cumulative number of this hole, default hole length range, then triggers this flaw flag signals and is this first logic level.

11. the described flaw signal pick-up unit of claim 9, wherein when this hole, hole length less than this cumulative number of this hole, default hole length range reach corresponding should be default during threshold value, then trigger this flaw flag signals and be this second logic level.

12. the described flaw signal pick-up unit of claim 9 wherein when maximum permissible value much larger than this hole, default hole length range appears in this hole hole length, then triggers this flaw flag signals and is this second logic level.