CN100369128C - Tracking controlling method - Google Patents
Tracking controlling method Download PDFInfo
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- CN100369128C CN100369128C CNB2006100922936A CN200610092293A CN100369128C CN 100369128 C CN100369128 C CN 100369128C CN B2006100922936 A CNB2006100922936 A CN B2006100922936A CN 200610092293 A CN200610092293 A CN 200610092293A CN 100369128 C CN100369128 C CN 100369128C
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Abstract
The present invention relates to a track-following control method which is used for controlling an optical drive to read or write a plurality of concave tracks and convex tracks in an optical disk. Firstly, an initial alternative point of each concave track and convex track is detected. When the initial alternative point of the concave track and the convex track is detected, a motor turnover value and a motor count value at this point are respectively stored to be used as a first reference value and a second reference value, wherein the motor turnover value and the motor count value are generated according to a motor signal. Subsequently, the motor turnover value and the motor count value are respectively accumulated and return to zero. When the accumulated motor turnover value is equal to the first reference value and the accumulated motor count value is equal to second reference value, the quasi position of an alternative signal is switched over. Finally, the concave track and the convex track are cut or read according to the quasi position of the alternative signal by using different cutting power or reading power.
Description
Technical field
The present invention is about a kind of control method of CD-ROM drive, particularly about a kind of rail guided control method of CD-ROM drive.
Background technology
In order to allow discs store more data, the discs specification of a new generation also changes the track structure of discs except using the shorter laser of wavelength.
As shown in Figure 1, it is the synoptic diagram of the discs track structure of a known DVD-RAM specification, and wherein the track of discs alternately is formed by connecting by recessed rail (Groove Track) and protruding rail (Land Track).As shown in Figure 1, the inner ring of discs is a protruding rail, second circle then is recessed rail, the 3rd circle is again a protruding rail, alternately connect and the discs track structure of formation DVD-RAM specification, its concave rail protruding rail replaces the junction and is called recessed rail protruding rail and replaces point (Land-Groove SwitchPoint), and the recessed rail protruding rail of each rail replaces point (for example recessed rail protruding rail is some P1 and P2 alternately) and is positioned on the same radius R.When CD-ROM drive reads the discs of DVD-RAM specification, because recessed rail is different with the height of protruding rail, therefore CD-ROM drive must replace a little by elder generation's recessed rail protruding rail of detecting, and then use different imprinting/readout powers to come imprinting/read recessed rail and protruding rail respectively with the control optical read/write head, make optical read/write head correctly read and write recessed rail or protruding rail.
As shown in Figure 2, it is known technology convexity block signal, follows the graph of a relation of rail rub-out signal and alternating signal.In the discs track of DVD-RAM specification, contain a plurality of projections district (Emboss Areas), it is for being engraved in the time data of discs in advance, and CD-ROM drive can produce a projection signal (Emboss Signal) when reading the projection district, as shown in Figure 2, the projection signal is periodic signal.In general, optical read/write head reads recessed rail protruding rail alternately during point, and following rail rub-out signal (TE, Tracking Error Signal) can be different, so known technology is that detecting follows the rail rub-out signal and replaces a little to judge recessed rail protruding rail.As shown in Figure 2, when optical read/write head reads protruding rail, following the rail rub-out signal is a sine wave, and when optical read/write head reads recessed rail, following the rail rub-out signal is a negative string ripple, and CD-ROM drive sends an alternating signal to switch different imprinting/readout powers by the variation that detecting follows the rail rub-out signal.But when discs has scratch or data not to carve at the beginning, it is obvious inadequately to cause following the rail rub-out signal, therefore possibly can't judge rightly the variation that follows the rail rub-out signal and can't find out correct recessed rail protruding rail alternately point to switch correct imprinting/readout power.
In addition, known technology can also another way come judicious recessed rail protruding rail to replace point to switch correct imprinting/readout power.Please refer to Fig. 3, it is the synoptic diagram of the interior physical label content (Physical ID field) of a section in the known technology.The beginning of each section (Sector) has a physical label (PID on the track, Physical ID), it comprises zone field (Sectorinformation) and sector number (Sector number), and wherein zone field comprises one and keeps hurdle (Reserved), physical label numbering (Physical ID number), a section form hurdle (Sectortype) and a number of plies (Layer number).Wherein, the relative position of section form hurdle record section in this track, section form hurdle is 4 to represent this section first section of track for this reason, that is recessed rail protruding rail alternately point be the initiating terminal that is positioned at this section, section form hurdle is 5 to represent this section last section of track for this reason, section form hurdle is 6 to represent this section section before last section of track for this reason, and section form hurdle is 7 to represent this section section of non-afore-mentioned in the track for this reason.
Known technology reads the section form hurdle of physical label of each section to judge the position of each section in track, when section form hurdle is 5, the section of representing optical read/write head just reading and writing is positioned at the tail end of this rail, that is be that next section that optical read/write head will be read and write is to belong to another track, that is to say that next section initiating terminal is that recessed rail protruding rail replaces a little.As shown in Figure 4, it is the graph of a relation of known technology convexity block signal, physical label and alternating signal, and CD-ROM drive is judged the position of each section in track by the section form hurdle that reads physical label, when reading section form hurdle when being 4, then send an alternating signal to switch different imprinting/readout powers.
Yet, known technology must ceaselessly be detected and follow the rail rub-out signal, or read the physical label content, therefore optical read/write head is controlled bad when the bad of discs or when reading discs, will cause and follow the rail rub-out signal or physical label is difficult for reading or identification, thus also can't judge rightly out recessed rail protruding rail alternately point to use different imprinting/readout powers.
Therefore, provide a kind of rail guided control method, judge mistakenly that in the hope of avoiding recessed rail protruding rail replaces a little, and then make CD-ROM drive correctly control recessed rail of optical read-write head accessing or protruding rail, one of current just important problem.
Summary of the invention
Because above-mentioned problem the invention provides a kind of alternately rail guided control method of point of recessed rail protruding rail of can avoiding judging mistakenly.
The present invention proposes a kind of rail guided control method, and it is controlled a CD-ROM drive and reads or write a discs, and wherein discs has a plurality of tracks, and a plurality of tracks comprise a plurality of recessed rails and a plurality of protruding rail, and replaces point alternately to be connected in series via a plurality of recessed rail protruding rails respectively.This rail guided control method is at first detected an initial recessed rail protruding rail and is replaced a little, when detecting an initial recessed rail protruding rail alternately during point, storing a motor turnover value and the motor count value of this moment respectively is one first reference value and one second reference value, and wherein this motor turnover value and this motor count value are to produce according to a motor signal.Then, add up respectively and make zero this motor turnover value and this motor count value.When this motor turnover value that adds up equals this first reference value and this motor count value that adds up and equals this second reference value, the accurate position of then switching an alternating signal.At last, come these recessed rail and protruding rails of imprinting/read according to the accurate position of alternating signal to determine different imprinting/readout powers.Wherein this motor signal is provided by a Spindle Motor, and this Spindle Motor comprises M rotor, and when this Spindle Motor rotates a circle, this motor signal is a M cycle square wave.
From the above, because of rail guided control method of the present invention is add up motor turnover value and motor count value, whenever the motor turnover that adds up be worth first reference value and the motor count value that adds up to second reference value, then representative detects a recessed rail protruding rail and replaces a little, so can avoid judging mistakenly that recessed rail protruding rail replaces a little, and then make CD-ROM drive correctly control recessed rail of optical read-write head accessing or protruding rail.
Description of drawings
Fig. 1 is the synoptic diagram of the discs track structure of known DVD-RAM specification.
Fig. 2 is known technology convexity block signal, follow the graph of a relation of rail rub-out signal and alternating signal.
Fig. 3 is the synoptic diagram of the interior physical label content of a section in the known technology.
Fig. 4 is the graph of a relation of known technology convexity block signal, physical label and alternating signal.
Fig. 5 is the block diagram of the CD-ROM drive of an embodiment of the invention.
Fig. 6 is the graph of a relation of each signal in the rail guided control method of an embodiment of the invention.
Fig. 7 is the process flow diagram of the rail guided control method of an embodiment of the invention.
The element numbers explanation:
ES: projection signal FGCNT: motor count value
FGIN: motor signal FGNUM: motor turnover value
LGS: alternating signal R: radius
R1: the first reference value R2: second reference value
S1: the first switching signal S2: second switching signal
PID: physical label P
1, P
2: recessed rail protruding rail replaces a little
RF: radiofrequency signal TE: follow the rail rub-out signal
1: discs
21: optical read/write head 22: Spindle Motor
23: long-range motor 24: motor driver
25: actuator 31: radio frequency amplifier
32: demoder 4: servo processor
41: follow rail module 42: measure module
421: counting unit 422: storage element
43: generation module 431: comparing unit
432: signal generation unit 44: control module
S71-S74: the step of rail guided control method
Embodiment
Hereinafter with reference to correlative type, rail guided control method and CD-ROM drive according to the embodiment of the invention are described.
As shown in Figure 5, it is the block diagram of the CD-ROM drive of an embodiment of the invention.This CD-ROM drive comprises an optical read/write head (Optical Pick-up Head) 21, one Spindle Motor (Spindle Motor) 22, one long-range motor (Feed Motor) 23, one motor driver (Motor Driver) 24, one actuator (Actuator) 25, a radio frequency amplifier (RF Amplifier) 31, one demoder 32 and a servo processor 4.Wherein servo processor 4 comprises and follows rail module 41, and measure module 42, a generation module 43 and a control module 44.
In one embodiment of this invention, following rail module 41, measurement module 42, generation module 43 and control module 44 can be the program code that is executed in servo processor 4.Servo processor 4 can be a controller (Controller) or a processor (Processor).In addition, radio frequency amplifier 31, demoder 32 can be integrated in the middle of the same chip with servo processor 4.
Optical read/write head 21 can be divided into a radiofrequency signal RF, and follow a rail rub-out signal TE and a projection signal ES after data that discs 1 reads is via radio frequency amplifier 31 processing and amplifying.Radio frequency amplifier 31 will follow rail rub-out signal TE and projection signal ES and be sent to and follow rail module 41 in the servo processor 4.In addition, radio frequency amplifier 31 is sent to demoder 32 with radiofrequency signal RF, and demoder 32 is sent to the decoded physical label PID of radiofrequency signal RF and follows rail module 41.Therefore following rail module 41 can be according to following rail rub-out signal TE or physical label PID, and an initial recessed rail protruding rail that detects discs 1 replaces a little, and for example the recessed rail protruding rail of Fig. 1 replaces some P1.Detect an initial recessed rail protruding rail alternately during point when following rail module 41, the first switching signal S1 that then sends one first accurate position is to generation module 43 and measure module 42.
As shown in Figure 6, it is the graph of a relation of each signal in the rail guided control method of an embodiment of the invention.Motor turnover value FGNUM begins to add up by 0, and whenever motor signal FGIN generation one-period square wave, then counting unit 421 adds up 1 with motor turnover value FGNUM.In the present embodiment, Spindle Motor 22 comprises 6 rotors, so after motor turnover value FGNUM began to be added to 5 by 0, counting unit 421 began to add up after motor turnover value FGNUM is made zero again.Motor count value FGCNT produces according to motor signal FGIN.In the present embodiment, during motor signal FGIN produced the one-period square wave, after counting unit 421 began motor count value FGCNT to be added to 1024 by 1, counting unit 421 began to add up after motor count value FGCNT being made zero again again.When at time point a, counting unit 421 detects the first switching signal S1 of the first accurate position, then saves as the first reference value R1 and the second reference value R2 respectively to storage element 422 according to motor turnover this moment value FGNUM and motor count value FGCNT.In the present embodiment, the first reference value R1 is that 3, the second reference value R2 are 332.When at time point a, signal generation unit 432 also detects the first switching signal S1 of the first accurate position simultaneously, and then signal generation unit 432 switches alternating signal LGS when time point a.In the present embodiment, alternating signal LGS was a low level originally, when time point a, then was switched to a high levle.Afterwards, signal generation unit 432 is all detected the second switching signal S2.When at time point b, signal generation unit 432 detects the second switching signal S2 again when being first accurate, then switch alternating signal LGS once again to low level, this moment, Spindle Motor 22 rotated a circle, and made discs 1 next recessed rail protruding rail that rotates a circle replace a little.When signal generation unit 432 detects the second switching signal S2 again when being first accurate, then switch alternating signal LGS once again to high levle (figure does not show), the rest may be inferred switches alternating signal LGS.
In sum, the present invention replaces a little according to following the initial recessed rail protruding rail that rail rub-out signal TE or physical label PID find out on the discs 1, to store motor turnover value FGNUM and the motor count value FGCNT of this moment, save as the first reference value R1 and the second reference value R2 respectively.Because each recessed rail protruding rail alternately point all is positioned on the same radius, so be added to the first reference value R1 and when motor count value FGCNT is added to the second reference value R2 as motor turnover value FGNUM at every turn, then represent Spindle Motor 22 to rotate a circle, make discs 1 next recessed rail protruding rail that rotates a circle replace a little, so CD-ROM drive can correctly be controlled recessed rail of optical read/write head 21 accesses or protruding rail.
Fig. 7 is the process flow diagram of the rail guided control method of an embodiment of the invention.The rail guided control method of the embodiment of the invention comprises step S71 to step S74.At first carry out step S71, when detecting an initial recessed rail protruding rail alternately during point, the accurate position of switching an alternating signal, wherein this initial recessed rail protruding rail is according to a track rub-out signal TE alternately or a physical label PID detects.Then carry out step S72, when detecting an initial recessed rail protruding rail alternately during point, storing a motor turnover value and the motor count value of this moment respectively is one first reference value and one second reference value, and wherein this motor turnover value and this motor count value are to produce according to a motor signal.This motor signal is provided by a Spindle Motor, and this Spindle Motor comprises M rotor, and when this Spindle Motor rotates a circle, this motor signal is a M cycle square wave.Then carry out step S73, this motor turnover value and this motor count value add up respectively and make zero, wherein this motor turnover value begins to add up by 0, when this motor signal generation one-period square wave, then this motor turnover value adds up 1, after this motor turnover value is added to M-1, begin again to add up after this motor turnover value that makes zero, during this motor signal produces the one-period square wave, after this motor count value begins to be added to a pre-determined number by 1, begin again to add up after this motor count value that makes zero.Then carry out step S74, when this motor turnover value that adds up equals this first reference value and this motor count value that adds up and equals this second reference value, the accurate position of switching this alternating signal.At last, according to the accurate position of this alternating signal, come imprinting/read recessed rail or protruding rail with different imprinting/readout powers with decision.
The above only is an illustrative, but not is restrictive.Anyly do not break away from spirit of the present invention and category, and, all should be contained in the appended claim scope its equivalent modifications of carrying out or change.
Claims (3)
1. rail guided control method, it is controlled a CD-ROM drive and reads or write a discs, and wherein this discs has a plurality of tracks, and described track comprises a plurality of recessed rails and a plurality of protruding rail, and alternately point is alternately to be connected in series via a plurality of recessed rail protruding rails respectively, and this method comprises:
When detecting an initial recessed rail protruding rail alternately during point according to seeking rail mistake signal or physical label, storing a motor turnover value and the motor count value of this moment respectively is one first reference value and one second reference value, and wherein this motor turnover value and this motor count value are to produce according to a motor signal;
Respectively this motor turnover value and this motor count value are all added up and rezero operation, wherein when this motor signal generation one-period square wave, then this motor turnover value adds up 1, after this motor turnover value is added to M-1, begin again to add up after this motor turnover value that makes zero, and when this motor signal generation one-period square wave, after this motor count value begins to be added to a pre-determined number by 1, begin again to add up after this motor count value that makes zero; And
When the motor turnover value that adds up equals this first reference value and the motor count value that adds up when equaling this second reference value, imprinting/read described recessed rail and protruding rail are come in order to determine different imprinting/readout powers in the accurate position of switching an alternating signal;
Wherein this motor signal is provided by a Spindle Motor, and this Spindle Motor comprises M rotor, and when this Spindle Motor rotates a circle, this motor signal is a M cycle square wave.
2. rail guided control method according to claim 1 more comprises:
When detecting this initial recessed rail protruding rail alternately during point, the accurate position of switching this alternating signal.
3. rail guided control method according to claim 1, wherein when this alternating signal of switching is one first accurate, then use one first power to come imprinting or read described recessed rail, when switching this alternating signal and be one second accurate, then use one second power to come imprinting or read described protruding rail.
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CNB2006100922936A CN100369128C (en) | 2006-06-16 | 2006-06-16 | Tracking controlling method |
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CNB2006100922936A CN100369128C (en) | 2006-06-16 | 2006-06-16 | Tracking controlling method |
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CN100369128C true CN100369128C (en) | 2008-02-13 |
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Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0916965A (en) * | 1995-06-30 | 1997-01-17 | Nikon Corp | Optical disk and recording power setting method for same |
WO2004081919A2 (en) * | 2003-03-11 | 2004-09-23 | Koninklijke Philips Electronics N.V. | Dual-speed optical record carrier recording apparatus |
US20050180285A1 (en) * | 2001-08-24 | 2005-08-18 | Langereis Gerardus R. | Optical record carrier recording method and apparatus |
CN1658296A (en) * | 2004-01-06 | 2005-08-24 | 三星电子株式会社 | Optical disk writing method and optical disk recording equipment |
-
2006
- 2006-06-16 CN CNB2006100922936A patent/CN100369128C/en active Active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0916965A (en) * | 1995-06-30 | 1997-01-17 | Nikon Corp | Optical disk and recording power setting method for same |
US20050180285A1 (en) * | 2001-08-24 | 2005-08-18 | Langereis Gerardus R. | Optical record carrier recording method and apparatus |
WO2004081919A2 (en) * | 2003-03-11 | 2004-09-23 | Koninklijke Philips Electronics N.V. | Dual-speed optical record carrier recording apparatus |
CN1658296A (en) * | 2004-01-06 | 2005-08-24 | 三星电子株式会社 | Optical disk writing method and optical disk recording equipment |
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