CN101083092B - Servo calibration mark detection circuit and method thereof - Google Patents
Servo calibration mark detection circuit and method thereof Download PDFInfo
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- CN101083092B CN101083092B CN2007101054884A CN200710105488A CN101083092B CN 101083092 B CN101083092 B CN 101083092B CN 2007101054884 A CN2007101054884 A CN 2007101054884A CN 200710105488 A CN200710105488 A CN 200710105488A CN 101083092 B CN101083092 B CN 101083092B
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Abstract
The invention provides a servo calibration mark detection circuit for use in an optical disk drive. The servo calibration mark detection circuit comprises a summing processor, a slicing level generator, and a comparator. The summing processor sums an intensity of a light beam reflected from both an inner groove and an outer groove to obtain a first signal. The slicing level generator generates a slicing level. The comparator then compares the first signal with the slicing level to obtain a second signal, wherein the second signal indicates a first location of a first servo calibration mark recorded on the inner groove and a second location of a second servo calibration mark recorded on the outer groove. Provided servo calibration mark detection method and detection circuit can determine the location of the servo calibration mark, and balance tilt of disc based on the mark.
Description
Technical field
The invention relates to CD, particularly relevant for the servo correction mark (ServoCalibration Mark, method SCM) and the testing circuit that detect CD.
Background technology
The CD-ROM drive mat detects the radio-frequency (RF) signal strength that pit (pit) and plane (land) are reflected on the track of a CD, and fetches data from optical disk reading.When the plane of CD during, be referred to as " inclination " (tilt) not exclusively perpendicular to the projecting direction of radiofrequency signal.This may be that the plane of CD-ROM drive fixed light disc not to be aimed at institute and caused.When tilting to take place, the focus of radiofrequency signal can't normally focus on the disc tracks face, causes the mistake of reading of data.Therefore when reading CD, must compensate inclination.The compensation of tilting is called angular balance (tilt balance) again.
Servo correction mark (SCM) among HD-DVD or the DVD-RAM is for being recorded in the micro marks on the disc tracks.Fig. 1 is the synoptic diagram of the servo correction mark that write down on two adjacent tracks of HD-DVD.Two adjacent tracks are respectively inner track 130 and outer side track 110.Between inner track 130 and the outer side track 110 plane area (land).The swinging signal that the address information of track is crossed with modulation (wobble) kenel is recorded in track 110 and 130, if normal phase swing (Normal Phase Wobble, NPW) then represent 0, (Inverted Phase Wobble IPW) then represents 1 and inverted phase is swung.The servo correction mark that is recorded on track 110 and 130 has two classes.Symmetry servo correction mark 132 and 112 is and is recorded in inner track 130 and outer side track 110 symmetrically.Asymmetric servo correction mark 134 and 114 is recorded in inner track 130 and outer side track 110 asymmetricly.The rail portion of record servo correction mark is removed to make plane (land) in the above.
The focus 102 of radiofrequency signal is projeced on the HD-DVD discs surface and along track and moves with reading of data.Focus 102 is the data of sweep record on inner track 130 and outer side track 110 simultaneously.Focus 102 is split into four quadrant A, B, C, D, is carried out the detection of reflected signal strength respectively by an optical sensor.Therefore, the radio-frequency (RF) signal strength that is obtained by inner track 130 reflections can be represented by (A+D) and reflect the radio-frequency (RF) signal strength that obtains by outer side track 110 by (B+C) expression.
Fig. 2 a displayed record is at the symmetrical servo correction mark 206 and 208 of inner track 204 with outer side track 202.Symmetry servo correction mark 206 and 208 comprises a plurality of plane domains (land) and is formed at repeatedly on inner track 204 and the outer side track 202.The persistence length of each plane domain is 8T.Fig. 2 b shows the reflected signal strength that CD reading head receives when reading symmetrical servo correction mark 206 and 208.Radiofrequency signal on being projeced into inner track 204 and outer side track 202 progressively as shown in fig. 1 as when track moves, the reflection strength of radiofrequency signal is shown in Fig. 2 b.Because symmetrical servo correction mark 206 and 208 comprises plane domain repeatedly on track 204 and 202, when the projection focus point ran into plane domain, the reflection strength of radiofrequency signal just increased accordingly.Therefore, the waveform of reflection strength such as same sine wave or a succession of pulse (glitch).
Fig. 3 a displayed record is at the asymmetric servo correction mark 306 and 308 of inner track 304 with outer side track 302.Asymmetric servo correction mark 306 and 308 is respectively two plane domains and is formed asymmetrically on inner track 304 and outer side track 302.The persistence length of each plane domain is two wavelength of swinging signal (wobble).Fig. 3 b shows the reflected signal strength that CD reading head receives when reading asymmetric servo correction mark 306 and 308.Radiofrequency signal on being projeced into inner track 304 and outer side track 302 progressively as shown in fig. 1 as when track moves, the reflection strength of radiofrequency signal is shown in Fig. 3 b.When the projection focus point ran into the plane domain of asymmetric servo correction mark 306 and 308, the reflection strength of radiofrequency signal just increased accordingly.Because early than the plane domain of asymmetric servo correction mark 308 on track 302, so the waveform of reflection strength has two peak value P to asymmetric servo correction mark 306 at the plane domain on the track 304
1With P
2, correspond respectively to asymmetric servo correction mark 306 and 308.
Fig. 4 is the block diagram of the available circuit 400 of the position of estimation servo correction mark.The read head of CD-ROM drive at first detects the swinging signal (wobble signal) of track.Wobble signal processor 402 then derives a series of wobble data position according to swinging signal.Wobble data code translator 404 is then deciphered the wobble data position to obtain address information.Owing to stored address information in the swinging signal, and the position of servo correction mark can estimate by address information, so servo correction mark indicator 406 can be estimated the position that the servo correction mark by address information.Then, the read head of CD-ROM drive reads the servo correction mark according to the position of servo correction mark again, carries out the angular balance of CD afterwards again according to the servo correction mark.
The circuit 400 of Fig. 4 needs mat swinging signal data to decide the position of servo correction mark.Yet, when the beginning CD seek rail (tracking-on) time, and can't read swinging signal, also just can't mat swinging signal data decide the position of servo correction mark, more can't carry out the angular balance of CD according to the servo correction mark.Therefore, need a kind of method that detects the servo correction mark, use for CD-ROM drive.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of servo correction mark testing circuit (servocalibration mark detection circuit), be used for a CD-ROM drive, to solve the problem that prior art exists.This servo correction mark testing circuit comprises an adder processor, and one cuts voltage generator, and a comparer.This adder processor will be from the intensity addition of an inner track (inner groove) with the radiofrequency signal of an outer side track (outer groove) reflection, to obtain one first signal.This cuts voltage generator generation one and cuts voltage (slicing voltage).This comparer relatively this first signal and this cuts voltage, to produce a secondary signal.Wherein this inner track is adjacent with this outer side track, and this secondary signal is indicated a primary importance of the one first servo correction mark that is recorded in this inner track and a second place that is recorded in one second servo correction mark of this outer side track.
The present invention also provides the method for a kind of detection servo correction mark (servo calibration mark), is used for a CD-ROM drive.At first, will be from the intensity addition of the radiofrequency signal of an inner track and outer side track reflection, to obtain one first signal.Then, produce one and cut voltage.Then, relatively this first signal and this cut voltage, to produce a secondary signal.Wherein this inner track is adjacent with this outer side track, and this secondary signal is indicated a primary importance of the one first servo correction mark that is recorded in this inner track and a second place that is recorded in one second servo correction mark of this outer side track.
The present invention also provides a kind of servo correction mark testing circuit (servo calibration mark detectioncircuit), is used for a CD-ROM drive.This servo correction mark testing circuit comprises a push-pull type processor, and one cuts voltage generator, one first comparer, one second comparer, and a binding modules.This push-pull type processor (push-pull processor) will subtract each other from one first intensity of the radiofrequency signal of inner track reflection and one second intensity from the radiofrequency signal of outer side track reflection, to obtain one first signal.This cuts voltage generator and cuts voltage (slicing voltage) and one second and cut voltage in order to produce one first.This first comparer relatively this first signal and this first cuts voltage, and to produce a secondary signal, this secondary signal indication is recorded in a primary importance of one first servo correction mark of this inner track.This second comparer relatively this first signal and this second cuts voltage, and to produce one the 3rd signal, the indication of the 3rd signal is recorded in a second place of one second servo correction mark of this outer side track.This binding modules, to obtain one the 4th signal, wherein this inner track is adjacent with this outer side track in conjunction with this secondary signal and the 3rd signal, and the indication of the 4th signal is recorded in this primary importance and this second place.
The present invention also provides a kind of method that detects the servo correction mark, is used for a CD-ROM drive.At first, will subtract each other from one first intensity of the radiofrequency signal of inner track reflection and one second intensity, to obtain one first signal from the radiofrequency signal of outer side track reflection.Then, producing one first cuts voltage and one second and cuts voltage.Then, relatively this first signal and this first cuts voltage, and to produce a secondary signal, this secondary signal indication is recorded in a primary importance of one first servo correction mark of this inner track.Then, relatively this first signal and this second cuts voltage, and to produce one the 3rd signal, the indication of the 3rd signal is recorded in a second place of one second servo correction mark of this outer side track.At last, to obtain one the 4th signal, wherein this inner track is adjacent with this outer side track in conjunction with this secondary signal and the 3rd signal, and the indication of the 4th signal is recorded in this primary importance and this second place.
The method of detection servo correction mark provided by the invention and testing circuit can determine the position of servo correction mark, carry out the angular balance of CD according to the servo correction mark.
Description of drawings
Fig. 1 is the synoptic diagram of the servo correction mark that write down on two adjacent tracks of HD-DVD;
Fig. 2 a displayed record is at the symmetrical servo correction mark of inner track and outer side track;
Fig. 2 b shows the reflected signal strength that CD reading head receives when reading symmetrical servo correction mark;
Fig. 3 a displayed record is at the asymmetric servo correction mark of inner track and outer side track;
Fig. 3 b shows the reflected signal strength that CD reading head receives when reading asymmetric servo correction mark;
Fig. 4 is the block diagram of the available circuit of the position of estimation servo correction mark;
Fig. 5 is the block diagram according to servo correction mark testing circuit of the present invention;
Fig. 6 is the process flow diagram according to the method for detection servo correction mark of the present invention;
The signal that the servo correction mark testing circuit of Fig. 7 displayed map 5 produces;
Fig. 8 is the block diagram according to another servo correction mark testing circuit of the present invention;
Fig. 9 detects the process flow diagram of the method for servo correction mark according to of the present invention another; And
The signal that the servo correction mark testing circuit of Figure 10 displayed map 8 produces.
Drawing reference numeral:
500,800～servo correction mark testing circuit;
502,802～CD;
504,804～radio-frequency module;
506,808～adder processor;
806～push-pull type processor;
510,810～servo correction mark position produces circuit;
512,812～direct current component extractor;
514,814,815～voltage regulator module;
516,816～comparer;
818～binding modules;
520,820～servo correction mark peak detection circuit;
522,822,524,824～peak records module;
526,826～multiplexer;
528,828～analog-to-digital converter; And
530,830～digital processing unit.
Embodiment
For above-mentioned and other purposes of the present invention, feature and advantage can be become apparent, several preferred embodiments cited below particularly, and cooperate Figure of description, be described in detail below:
Fig. 5 is the block diagram according to servo correction mark testing circuit 500 of the present invention.Servo correction mark testing circuit 500 is arranged in the CD-ROM drive, in order to detect the servo correction mark of CD 502.In an embodiment, CD 502 is HD-DVD.At first, radio-frequency module 504 mats one radiofrequency signal of CD-ROM drive is projected on two adjacent tracks simultaneously, comprises an inner track and an outer side track, shown in the radiofrequency signal focus 102 of Fig. 1.In an embodiment, radio-frequency module 504 is CD reading head.The servo correction mark of CD 502 comprises as the symmetrical servo correction mark 112 among Fig. 1 and 132 and as the asymmetric servo correction mark 134 and 114 among Fig. 1.
Servo correction mark testing circuit 500 comprises that adder processor 506, servo correction mark position produce circuit 510, digital processing unit 530 and servo correction mark peak detection circuit 520.Fig. 6 is the process flow diagram according to the method 600 of detection servo correction mark of the present invention.Servo correction mark testing circuit 500 detects the servo correction mark of CD 502 according to method 600.Adder processor 506 at first will be from the intensity addition of the radiofrequency signal of inner track and outer side track reflection, to obtain a N in step 602
0Signal.Because the reflected signal of radiofrequency signal is divided into 4 quadrants, respectively by different optical sensor A, B, C, D independent detection, as shown in Figure 1, therefore (A+D) reaches the intensity of (B+C) representing respectively from the radiofrequency signal of inner track and outer side track reflection, and the signal N that adder processor 506 produces
0Can be expressed as (A+B+C+D).Fig. 7 shows the signal N that adder processor 506 produces
0Signal N
0Zone 708 corresponding to symmetrical servo correction mark, and signal N
0Zone 712 and 714 correspond respectively to the asymmetric servo correction mark that is recorded in inner track and outer side track.
Owing to do not need to use symmetrical servo correction mark to carry out angular balance in the present embodiment, so digital processing unit is eliminated N in 604
0The pulse 708 that produces because of symmetrical servo correction mark in the signal.Servo correction mark position produces circuit 510 and follows in step 606 according to N
0Signal produces the position of the asymmetric servo correction mark that is recorded in inner track and outer side track.Servo correction mark position produces circuit 510 and comprises and cut voltage generator (slicing level generator) and comparer 516.In an embodiment, this cuts voltage generator and comprises a direct current part extractor 512 and a voltage regulator module 514.Direct current component extractor 512 takes out signal N
0Direct current component, this direct current component is shown in the L of Fig. 3 b.Voltage regulator module 514 is then adjusted the voltage of this direct current component, to obtain an adjusted direct current component, cuts voltage as this.Comparer 516 is comparison signal N then
0Cut voltage with this, to produce a signal N
1, signal N
1As shown in Figure 7.Signal N
1Zone 702 and 704 indicate the position of the asymmetric servo correction mark that is recorded in inner track and outer side track respectively.
Digital processing unit 530 is followed in step 608 according to N
1Signal deciding indication is recorded in the position of the asymmetric servo correction mark of inner track
Signal and indication are recorded in the position of the asymmetric servo correction mark of outer side track
Signal.
Signal and
Signal all is shown among Fig. 7, wherein
The zone 722 of signal is corresponding to the position of the asymmetric servo correction mark that is recorded in inner track, and
The zone 724 of signal is corresponding to the position of the asymmetric servo correction mark that is recorded in outer side track.
Servo correction mark peak detection circuit 520 is basis signal N then
0,
Detection record is in the position of the asymmetric servo correction mark of inner track and outer side track.Servo correction mark peak detection circuit 520 comprises two peak records modules 522 and 524, multiplexer 526 and analog-to-digital converter 528.Peak records module 522 foundation in step 610
722 record N during the enabling of signal
0The peak value P of signal
1Because
722 corresponding to the servo correction mark that is recorded in inner track during the enabling of signal, so peak value P
1Servo correction mark corresponding to inner track.Peak records module 524 foundation in step 612
724 record N during the enabling of signal
0The peak value P of signal
2Because
724 corresponding to the servo correction mark that is recorded in outer side track during the enabling of signal, so peak value P
2Servo correction mark corresponding to outer side track.
At peak value P
1With P
2Deliver to before the digital processing unit 530, must be converted into digital value earlier.The signal that multiplexer 526 produces according to digital processing unit 530
With a channel transfer peak value P
1With P
2To analog-to-digital converter 528, wherein signal
Also be shown in Fig. 7.Then, analog-to-digital converter 528 is with peak value P
1With P
2Be converted to digital value.Because peak value P
1With P
2Expression is by the servo correction mark institute reflected radio signal intensity of inner track and outer side track, if peak value P
1With P
2Unequal, expression CD 502 has to tilt to take place.Therefore, digital processing unit 530 in step 616 according to peak value P
1With P
2The heeling condition of decision CD 502.Then, CD-ROM drive just can carry out the angular balance of CD 502 according to this heeling condition in step 616.Therefore, servo correction mark testing circuit 500 data that need not swing (wobble) signal just can detect the position of servo correction mark.
Fig. 8 is the block diagram according to servo correction mark testing circuit 800 of the present invention.Servo correction mark testing circuit 800 carries out the detection of servo correction mark according to the method 900 of Fig. 9.The servo correction mark testing circuit 800 of Fig. 8 is similar to the servo correction mark testing circuit 500 of Fig. 5 substantially, except the servo correction mark position that has increased push-pull type processor (push-pull processor) 806 and Fig. 8 produces the servo correction mark position generation circuit 510 that circuit 810 is different from Fig. 5 slightly.Therefore, only just both do not exist together and describe below.
Because the servo correction mark testing circuit 500 of Fig. 5 only will be from the intensity addition of inner track with the radiofrequency signal of outer side track reflection, so the N that obtains
0Signal packet contains a succession of pulse 708 that is produced because of symmetrical servo correction mark, and digital processing unit 530 must additionally be removed pulse 708.Otherwise pulse 708 can cause signal N
1Mistake.Digital processing unit 530 has increased its extra burden and has made its structure complicated for the processing of removing pulse 708.
For fear of above-mentioned shortcoming, the servo correction mark testing circuit 800 of Fig. 8 has increased push-pull type processor 806.Push-pull type processor 806 will subtract each other from first intensity of the radiofrequency signal of inner track reflection and second intensity from the radiofrequency signal of outer side track reflection in step 902, to obtain N
4Signal.If detect by optical sensor A, B, C, D respectively among reflected radio signal such as Fig. 1, the N that produced of push-pull type processor 806 then
4Signal can be expressed as (A+D-B-C).As shown in Figure 10, because the pulse that symmetrical servo correction mark produces is because of formula (A+D-B-C) disappears mutually, so N
4Signal does not have the N as Fig. 7
0Have impulsive noise as the signal.Because N
4Impulsive noise in the signal is eliminated or is reduced, and the digital processing unit 830 of Fig. 8 must additionally not removed pulse 708, thereby has reduced the work load of digital processing unit 830, and has simplified the circuit design of digital processing unit 830.
Servo correction mark position produces circuit 810 and follows in step 904 according to N
4Signal produces the position of the asymmetric servo correction mark that is recorded in inner track and outer side track.Servo correction mark position produce circuit 810 comprise one cut voltage generator, two comparers 816,817 and merge module 818.In an embodiment, this cuts voltage generator and comprises a direct current part extractor 812 and two voltage regulator modules 814,815.Direct current component extractor 812 takes out signal N
4Direct current component.Because signal N
4Peak value P
1' be not as signal N
0Peak value P
1As be on the occasion of, therefore need carry out different processing.Voltage regulator module 814 and 815 is then adjusted the voltage of direct current component respectively, cuts voltage to obtain two respectively.Comparer 816,817 is difference comparison signal N then
4With these two cut voltage, to produce signal N
5And signal N
6, signal N
5And signal N
6As shown in figure 10.Signal N
5Zone 1002 and signal N
6Zone 1004 indicate the position of the asymmetric servo correction mark that is recorded in inner track and outer side track respectively.In an embodiment, merge module 818 and be one or door (OR gate).Or 818 couples of signal N of door
5And signal N
6Carry out or (OR) computing to obtain signal N
7As shown in figure 10, signal N
7Zone 1012 and zone 1014 respectively indication be recorded in the position of the asymmetric servo correction mark of inner track and outer side track.
Digital processing unit 830 is then in the signal of step 906 basis signal N7 derived graph 7
And
The intensity addition of the radiofrequency signal that adder processor 808 then will reflect from inner track and outer side track in step 908 is to obtain signal N
0Peak records module 822 and 824 is foundation in step 910 and 912 then
And
Write down N during the enabling of signal
0The peak value P of signal
1And P
2At last, digital processing unit 830 in step 914 according to peak value P
1With P
2The heeling condition of decision CD 802.Then, CD-ROM drive just can carry out the angular balance of CD 502 according to this heeling condition in step 916.Therefore, servo correction mark testing circuit 800 data that also need not swing (wobble) signal just can detect the position of servo correction mark.
Though the present invention discloses as above with preferred embodiment; right its is not in order to limiting the present invention, any those who familiarize themselves with the technology, without departing from the spirit and scope of the present invention; when can doing a little change and retouching, so protection scope of the present invention is as the criterion when looking the claim person of defining.
Claims (26)
1. a servo correction mark testing circuit is used for a CD-ROM drive, and this servo correction mark testing circuit comprises:
One adder processor will be from the intensity addition of the radiofrequency signal of an inner track and outer side track reflection, to obtain one first signal;
One cuts voltage generator, cuts voltage in order to produce one; And
One comparer, more described first signal and the described voltage that cuts are to produce a secondary signal;
Wherein said inner track is adjacent with described outer side track, and described secondary signal is indicated a primary importance of the one first servo correction mark that is recorded in described inner track and a second place that is recorded in one second servo correction mark of described outer side track.
2. servo correction mark testing circuit as claimed in claim 1, it is characterized in that, the described voltage generator that cuts comprises a direct current part extractor, and described direct current component extractor takes out the direct current component of described first signal, with as the described voltage that cuts.
3. servo correction mark testing circuit as claimed in claim 2, it is characterized in that, the described voltage generator that cuts also comprises a voltage regulator module, and this voltage regulator module is adjusted the voltage of described direct current component, to obtain an adjusted direct current component with as the described voltage that cuts.
4. servo correction mark testing circuit as claimed in claim 1, it is characterized in that, this servo correction mark testing circuit also comprises a digital processing unit that is coupled to described comparer, and this digital processing unit is represented one the 3rd signal of described primary importance according to described secondary signal decision and represented one the 4th signal of the described second place.
5. servo correction mark testing circuit as claimed in claim 4 is characterized in that, described servo correction mark testing circuit also comprises:
One first peak value record module, be coupled to described adder processor and described digital processing unit, according to one first peak value of described first signal of described the 3rd signal record, wherein this first peak value is produced by the described first servo correction mark that described inner track writes down; And
One second peak records module, be coupled to described adder processor and described digital processing unit, according to one second peak value of described first signal of described the 4th signal record, wherein this second peak value is produced by the described second servo correction mark that described outer side track writes down.
6. servo correction mark testing circuit as claimed in claim 5, it is characterized in that, described first peak value and second peak value are sent to described digital processing unit, this digital processing unit described first peak value of foundation and second peak value determine a heeling condition of described CD, and described CD-ROM drive carries out the angular balance of this CD according to this heeling condition.
7. servo correction mark testing circuit as claimed in claim 5 is characterized in that, described servo correction mark testing circuit also comprises:
One multiplexer is coupled to described digital processing unit and described first peak value record module and the described second peak records module, and one the 5th signal that the described digital processing unit of foundation produces is with described first peak value of a channel transfer and second peak value; And
One analog-to-digital converter is coupled to described multiplexer, described first peak value and the second peak value self simulation is converted to digital kenel, to be sent to described digital processing unit.
8. servo correction mark testing circuit as claimed in claim 1 is characterized in that, described CD-ROM drive is a HD-DVD CD-ROM drive.
9. a method that detects the servo correction mark is used for a CD-ROM drive, it is characterized in that, this method comprises the following steps:
Will be from the intensity addition of the radiofrequency signal of an inner track and outer side track reflection, to obtain one first signal;
Produce one and cut voltage;
More described first signal and this cut voltage, to produce a secondary signal;
Wherein said inner track is adjacent with described outer side track, and this secondary signal is indicated a primary importance of the one first servo correction mark that is recorded in described inner track and a second place that is recorded in one second servo correction mark of described outer side track.
10. the method for detection servo correction mark as claimed in claim 9 is characterized in that, the described generation step that cuts voltage comprises that the direct current component that takes out described first signal is with as the described voltage that cuts.
11. the method for detection servo correction mark as claimed in claim 10 is characterized in that, the described generation step that cuts voltage also comprises the voltage of adjusting described direct current component, to obtain an adjusted direct current component to cut voltage as this.
12. the method for detection servo correction mark as claimed in claim 9 is characterized in that this method also comprises the following steps:
One the 3rd signal of the described primary importance of decision expression and one the 4th signal of the expression second place;
According to one first peak value of described first signal of described the 3rd signal record, wherein this first peak value is produced by the described first servo correction mark that described inner track writes down; And
According to one second peak value of described first signal of described the 4th signal record, wherein this second peak value is produced by the described second servo correction mark that described outer side track writes down.
13. the method for detection servo correction mark as claimed in claim 12 is characterized in that this method also comprises the following steps:
Determine a heeling condition of described CD according to described first peak value and second peak value; And
Carry out the angular balance of described CD according to this heeling condition.
14. the method for detection servo correction mark as claimed in claim 9 is characterized in that, described CD-ROM drive is a HD-DVD CD-ROM drive.
15. a servo correction mark testing circuit is used for a CD-ROM drive, it is characterized in that, this servo correction mark testing circuit comprises:
One push-pull type processor will subtract each other from one first intensity of the radiofrequency signal of inner track reflection and one second intensity from the radiofrequency signal of outer side track reflection, to obtain one first signal;
One cuts voltage generator, cuts voltage and one second and cuts voltage in order to produce one first;
One first comparer, more described first signal and described first cuts voltage, and to produce a secondary signal, this secondary signal indication is recorded in a primary importance of one first servo correction mark of described inner track;
One second comparer, more described first signal and described second cuts voltage, and to produce one the 3rd signal, the indication of the 3rd signal is recorded in a second place of one second servo correction mark of described outer side track; And
One binding modules, in conjunction with described secondary signal and described the 3rd signal to obtain one the 4th signal;
Wherein said inner track is adjacent with described outer side track, and the indication of the 4th signal is recorded in the described primary importance and the described second place.
16. servo correction mark testing circuit as claimed in claim 15 is characterized in that, the described voltage generator that cuts comprises:
One direct current part extractor, a direct current part of taking out described first signal;
One first voltage regulator module is adjusted the voltage of described direct current component, to cut voltage as described first; And
One second voltage regulator module is adjusted the voltage of described direct current component, to cut voltage as described second.
17. servo correction mark testing circuit as claimed in claim 15 is characterized in that, described binding modules be one or the door.
18. servo correction mark testing circuit as claimed in claim 15, it is characterized in that, described servo correction mark testing circuit also comprises a digital processing unit that is coupled to described binding modules, one the 6th signal that this digital processing unit is represented one the 5th signal of described primary importance and represented the described second place according to described the 4th signal deciding.
19. servo correction mark testing circuit as claimed in claim 18 is characterized in that, described servo correction mark testing circuit also comprises:
One adder processor will be from the intensity addition of the radiofrequency signal of described inner track and outer side track reflection, to obtain one the 7th signal;
One first peak value record module, be coupled to described adder processor and digital processing unit, according to one first peak value of described the 7th signal of described the 5th signal record, wherein this first peak value is produced by the described first servo correction mark that described inner track writes down; And
One second peak records module, be coupled to described adder processor and described digital processing unit, according to one second peak value of described the 7th signal of described the 6th signal record, wherein this second peak value is produced by the second servo correction mark that described outer side track writes down.
20. servo correction mark testing circuit as claimed in claim 19, it is characterized in that, described first peak value and second peak value are sent to described digital processing unit, this digital processing unit described first peak value of foundation and second peak value determine a heeling condition of described CD, and described CD-ROM drive carries out the angular balance of this CD according to this heeling condition.
21. servo correction mark testing circuit as claimed in claim 19 is characterized in that, described servo correction mark testing circuit also comprises:
One multiplexer is coupled to described digital processing unit and described first peak value record module and the described second peak records module, and one the 8th signal that the described digital processing unit of foundation produces is with described first peak value of a channel transfer and second peak value; And
One analog-to-digital converter is coupled to described multiplexer, described first peak value and the second peak value self simulation is converted to digital kenel, to be sent to described digital processing unit.
22. servo correction mark testing circuit as claimed in claim 15 is characterized in that, described CD-ROM drive is a HD-DVD CD-ROM drive.
23. a method that detects the servo correction mark is used for a CD-ROM drive, it is characterized in that, this method comprises the following steps:
To subtract each other from one first intensity of the radiofrequency signal of inner track reflection and one second intensity, to obtain one first signal from the radiofrequency signal of outer side track reflection;
Producing one first cuts voltage and one second and cuts voltage;
More described first signal and this first cuts voltage, and to produce a secondary signal, described secondary signal indication is recorded in a primary importance of one first servo correction mark of described inner track;
More described first signal and described second cuts voltage, and to produce one the 3rd signal, described the 3rd signal indication is recorded in a second place of one second servo correction mark of described outer side track; And
To obtain one the 4th signal, wherein said inner track is adjacent with described outer side track in conjunction with described secondary signal and the 3rd signal, and the indication of the 4th signal is recorded in the described primary importance and the second place.
24. the method for detection servo correction mark as claimed in claim 23 is characterized in that, produces described first and cuts voltage and second step that cuts voltage comprises:
Take out a direct current part of described first signal;
Adjust the voltage of described direct current component, to cut voltage as described first; And
Adjust the voltage of described direct current component, to cut voltage as described second.
25. the method for detection servo correction mark as claimed in claim 23 is characterized in that described method also comprises the following steps:
Described the 4th signal deciding of foundation is represented one the 5th signal of described primary importance and is represented one the 6th signal of the described second place;
Will be from the intensity addition of the radiofrequency signal of described inner track and outer side track reflection, to obtain one the 7th signal;
According to one first peak value of described the 7th signal of described the 5th signal record, wherein this first peak value is produced by the described first servo correction mark that described inner track writes down; And
According to one second peak value of described the 7th signal of described the 6th signal record, wherein this second peak value is produced by the described second servo correction mark that described outer side track writes down.
26. the method for detection servo correction mark as claimed in claim 25 is characterized in that this method also comprises the following steps:
Determine a heeling condition of described CD according to described first peak value and second peak value; And
Carry out the angular balance of this CD according to described heeling condition.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US80362906P | 2006-06-01 | 2006-06-01 | |
| US60/803,629 | 2006-06-01 | ||
| US80483406P | 2006-06-15 | 2006-06-15 | |
| US60/804,834 | 2006-06-15 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101083092A CN101083092A (en) | 2007-12-05 |
| CN101083092B true CN101083092B (en) | 2010-12-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007101054884A Expired - Fee Related CN101083092B (en) | 2006-06-01 | 2007-06-01 | Servo calibration mark detection circuit and method thereof |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN101083092B (en) |
| TW (1) | TWI339839B (en) |
-
2007
- 2007-05-30 TW TW096119299A patent/TWI339839B/en not_active IP Right Cessation
- 2007-06-01 CN CN2007101054884A patent/CN101083092B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| TWI339839B (en) | 2011-04-01 |
| TW200805343A (en) | 2008-01-16 |
| CN101083092A (en) | 2007-12-05 |
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