CN100394491C - Optical storing device control circuit and method thereof - Google Patents
Optical storing device control circuit and method thereof Download PDFInfo
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- CN100394491C CN100394491C CNB2005100798417A CN200510079841A CN100394491C CN 100394491 C CN100394491 C CN 100394491C CN B2005100798417 A CNB2005100798417 A CN B2005100798417A CN 200510079841 A CN200510079841 A CN 200510079841A CN 100394491 C CN100394491 C CN 100394491C
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Abstract
This invention relates to a control circuit of optics memory device, it has: a circuit phase calculation element, which is used to calculate the loop circuit phase of the servo system according to at least one error signal of the servo system; and a system control element, links the circuit phase calculation element, which is used to do compensation control according to the best control parameter of the loop the circuit phase, the servo system includes a guided servo control system or a focusing servo control system, the said compensation control is radial incline controls or the adjustment of focusing balance , and at least a best control parameter which is determined by several loop circuit phase ,calculated by the circuit phase calculation element according to the best control parameter. This invention does not need to use the divider, and reduces at least one band-pass optical filter and low band filter compare with the existing technology. So, the invention uses much less calculation module, it is easy to realize.
Description
Technical field
The present invention relates to a kind of optical storage (optical storage device), refer to a kind of control circuit and method thereof of optical storage especially.
Background technology
Along with the lifting of computer operation speed and the rise of world-wide web, the user of every field grows with each passing day for the demand of data storage.Various CDs (optical disc), for example: the digital multi-purpose CD (Digital Versatile Disc, DVD) ... etc. because possess lightweight and portable in volume, memory capacity is considerable and advantage such as price economy, and becomes quite universal.Therefore, optical storage (optical storage device) corresponding to these CDs, for example: digital multi-purpose CD-ROM drive (DVD drive), digital multi-purpose CD writer (DVD burner) ... etc., the standard that becomes counter then one of is equipped with.
Please refer to Fig. 1, Fig. 1 is the synoptic diagram that the U.S. patent application case of publication number US 2003/0147315 discloses the control circuit of an optical storage empty disc tilt control device, and wherein the part assembly is not shown in Fig. 1.This inclination control circuit has at least: a tracking error signal computing unit 10, a loop level (loop level) computing unit 11, a system control unit 12, a radial skew (radial tilt) control module 14, a circulation orbital servo (tracking servo) unit 15.Tracking error signal computing unit 10, loop level computing unit 11 and circulation orbital servo unit 15 can be in order to constitute the inclination measuring equipment of blank CD.System control unit 12 can utilize the loop level (loop level) that records to represent tilt quantity, and produces a controlled variable according to the loop level that records, with the inclination angle between control CD 1 and the optical read head 3.The measuring equipment at the inclination angle that this optical storage is detailed as shown in Figure 2, wherein the part that indicates of square frame is the detailed construction of loop level computing unit 11 shown in Figure 1.Loop level computing unit 11 has: bandpass filter 1131 and 1141, rectifier 1132 and 1142 and low-pass filter 1133 and 1143.Waveform generator 112 can produce the disturbance that a waveform is the string ripple (disturbance) signal, and the output signal Vt that tracking error signal computing unit 10 is produced is known tracking error signal (TE signal).Loop level computing unit 11 is handled tracking error signal and the signal that obtains by totalizer 111 additions respectively by bandpass filter, rectifier and low-pass filtering assembly, to obtain two loop level signal Vin and Vout respectively.Loop level signal Vout and Vin are divided by for opening loop gain, and open between loop gain and the tilt quantity a corresponding relation is arranged, so system control unit 12 can be obtained the corresponding relation of this loop gain and controlled variable according to loop level signal Vin and Vout, with the inclination angle between control CD 1 and the optical read head 3.
From the above, system control unit 12 can be obtained the loop level corresponding to several controlled variable.System control unit 12 just according to the size of these loop level, is selected an optimum angle of incidence controlled variable in these controlled variable.Yet the calculating of optical storage loop gain need a divider, so comparatively complicated in realization.
Summary of the invention
Therefore the object of the present invention is to provide control circuit and the method thereof of a kind of optical storage (optical storagedevice).
The present invention discloses a kind of control circuit of optical storage, it includes: a servo-drive system, it has a circulation orbital servo control system or a focus servo control system, this servo-drive system includes: a servo control unit, be used for compensating control, this compensation is controlled to be radial skew control or focuses on the adjustment of balance; One loop phase (loop phase) computing unit is coupled to this servo-drive system, is used for closed loop phase place according at least one this servo-drive system of error signal calculation of this servo-drive system; An and system control unit, be coupled to loop phase computing unit and this servo-drive system, be used for producing best (optimized) controlled variable according to the closed loop phase place, with by utilizing this servo control unit to compensate control, wherein, optimization control parameter is at least one optimization control parameter that is determined according to a plurality of closed loops phase place that the loop phase computing unit calculates.
Described system control unit is first optimization control parameter of one first orbit radius and second optimization control parameter to one second orbit radius on should CD on the corresponding CD of decision in a plurality of controlled variable, again according to described first, second orbit radius and first, second optimization control parameter carry out an interpolation (interpolation) computing or an extrapolation (extrapolation) computing with the optimization control parameter that determines a corresponding intended orbit radius to compensate control.
A plurality of first phase places that described a plurality of closed loops phase place has one first orbit radius on the corresponding CD and a plurality of second phase places to one second orbit radius on should CD, described a plurality of first phase place has one first extreme value, this first extreme value is one first a tentative controlled variable in corresponding a plurality of controlled variable, and described control circuit includes in addition: a radiofrequency signal (RF signal) quality computing unit, be coupled to described system control unit, be used for calculating the best radiofrequency signal index of quality (RF qualityindex) of corresponding first orbit radius, this the best radiofrequency signal index of quality is one first a predetermined control parameter in corresponding described a plurality of controlled variable, wherein said system control unit is to calculate a controlled variable off-set value according to the first predetermined control parameter and the first tentative controlled variable, and described system control unit is the optimization control parameter that decides corresponding second orbit radius according to described a plurality of second phase places and controlled variable off-set value.
Described a plurality of second phase place has a secondary extremal, this secondary extremal is one second a tentative controlled variable in corresponding described a plurality of controlled variable, and described system control unit is the optimization control parameter that decides corresponding second orbit radius according to the second tentative controlled variable and controlled variable off-set value.
The described second tentative controlled variable equals the described first tentative controlled variable.
Described system control unit determines that the first predetermined control parameter is the optimization control parameter of corresponding first orbit radius.
The described best radiofrequency signal index of quality is corresponding to partial response signal noise ratio (partialresponse signal-to-noise ratio, PRSNR), continuous amplitude edge (SequencedAmplitude Margin, SAM) or simulated bit error rate (simulated bit error rate, SBER).
Described loop phase computing unit includes in addition: a signal generator is used for producing the disturbing signal of one-period property; At least one arithmetic element, it is subtracter or totalizer, this arithmetic element is to be used for periodic disturbing signal input circulation orbital servo control system or focus servo control system, with periodic disturbing signal and error signal is subtracted each other or addition; And phase detectors, be used for the periodic disturbing signal that the detection signal generator produces and the phase differential of error signal, wherein this phase differential is the closed loop phase place.
Described phase detectors include in addition: a bandpass filter, be coupled to error detection unit, and be used for filtering this error signal to produce a bandpass filtered signal; One digitizing (digitizing) unit is coupled to bandpass filter, is used for producing a binary (binary) signal according to bandpass filtered signal; One XOR computing (esclusive OR, XOR) unit is coupled to digital unit, is used for disturbing signal and binary signal are carried out an XOR to produce a pulse signal; And level and smooth (smooth) wave filter, be coupled to the XOR arithmetic element, be used for the filtered pulse signal to produce an output signal, wherein this output signal level is corresponding to a phase place in described a plurality of phase places.
The present invention also provides a kind of control method of optical storage accordingly, and it includes: (a) the closed loop phase place of at least one this servo-drive system of error signal calculation of foundation one servo-drive system; And (b) produce best (optimized) controlled variable to compensate control according to this closed loop phase place, wherein said servo-drive system includes a circulation orbital servo control system or a focus servo control system, described compensation is controlled to be radial skew (radial tilt) control or focuses on the adjustment of balance (focus balance), and described optimization control parameter is at least one optimization control parameter that is determined according to a plurality of closed loops phase place that the step of the closed loop phase place of calculating servo is calculated.
Step (b) includes in addition: first optimization control parameter of one first orbit radius and second optimization control parameter to one second orbit radius on should CD on the corresponding CD of decision in described a plurality of controlled variable; And according to described first, second orbit radius and first, second optimization control parameter carry out an interpolative operation or an extrapolation computing with the optimization control parameter that determines a corresponding intended orbit radius to compensate control.
A plurality of first phase places that described a plurality of phase place has one first orbit radius on the corresponding CD and a plurality of second phase places to one second orbit radius on should CD, described a plurality of first phase place has one first extreme value, this first extreme value is one first a tentative controlled variable in corresponding described a plurality of controlled variable, and described control method includes in addition: calculate the best radiofrequency signal index of quality of corresponding first orbit radius, this best radiofrequency signal index of quality is one first a predetermined control parameter in corresponding described a plurality of controlled variable; Wherein step (b) is calculated a controlled variable off-set value according to the first predetermined control parameter and the first tentative controlled variable in addition, and decides the optimization control parameter of corresponding second orbit radius according to described a plurality of second phase places and controlled variable off-set value.
Described a plurality of second phase place has a secondary extremal, this secondary extremal is one second a tentative controlled variable in corresponding described a plurality of controlled variable, and step (b) is to decide the optimization control parameter of corresponding second orbit radius according to the second tentative controlled variable and controlled variable off-set value.
The described second tentative controlled variable equals the described first tentative controlled variable.
Described step (b) includes in addition: determine that the first predetermined control parameter is the optimization control parameter of corresponding first orbit radius.
The described best radiofrequency signal index of quality is corresponding to partial response signal noise ratio, continuous amplitude edge or simulated bit error rate.
Described step (a) includes in addition: the disturbing signal that produces one-period property; Periodic disturbing signal input is followed rail or focus servo control system; And the phase differential of the disturbing signal of sense cycle and error signal, wherein phase differential is the closed loop phase place.
Described step (a) includes in addition: (a-0) the filter error signal is to produce a bandpass filtered signal; (a-1) produce a binary signal according to bandpass filtered signal; (a-2) disturbing signal and binary signal are carried out an XOR to produce a pulse signal; And (a-3) the filtered pulse signal is to produce an output signal, and wherein this output signal level is corresponding to a phase place in described a plurality of phase places.
Apparatus and method of the present invention need not used divider, reduce a bandpass filter and a low-pass filter at least in addition compared to prior art.Therefore, the component count that is used for calculating required for the present invention still less, so be easier to realize.
Description of drawings
Fig. 1 is the synoptic diagram of a control circuit in the known optical storage.
Fig. 2 is the synoptic diagram that follows the rail control loop of control circuit shown in Figure 1.
Fig. 3 is the synoptic diagram according to the control circuit of the optical read head of an optical storage of the present invention.
Fig. 4 is according to the first embodiment of the present invention, is used for measuring the synoptic diagram of the assembly of closed loop phase place in control circuit shown in Figure 3.
Fig. 5 is according to first embodiment of the invention, is used for measuring the synoptic diagram of the assembly of closed loop phase place in control circuit shown in Figure 3.
Fig. 6 is the synoptic diagram of loop phase computing unit shown in Figure 3.
Fig. 7 is the synoptic diagram of the curve of the closed loop phase place of corresponding first embodiment of the invention and frequency.
Fig. 8 is that the closed loop transfer function phase place measurement level and the radiofrequency signal index of quality correspond respectively to the synoptic diagram of two curves of controlled variable under the possible situation of first embodiment of the invention.
Fig. 9 is according to the process flow diagram of the control method of optical storage of the present invention.
Figure 10 is according to the process flow diagram of the control method of optical storage of the present invention.
Figure 11 is according to second embodiment of the invention, is used for measuring the synoptic diagram of the assembly of closed loop phase place in control circuit shown in Figure 3.
Figure 12 is the synoptic diagram of the curve of the closed loop phase place of corresponding second embodiment of the invention and frequency.
Figure 13 is that the closed loop sensitivity function phase place measurement level and the radiofrequency signal index of quality correspond respectively to the synoptic diagram of two curves of controlled variable under the possible situation of second embodiment of the invention.
1 CD, 3 optical read heads
10 tracking error signal computing units, 11 loop level computing units
12 system control units, 14 radial skew control modules
15 circulation orbital servo unit, 111 totalizers
112 waveform generators, 113,114 level detection unit
1131,1141 bandpass filter, 1132,1142 rectifiers
1133,1143 low-pass filters, 310 optical read heads
314 focus error detection unit, 312 radio-frequency signal detection unit
316 tracking error detecting units, 320 radiofrequency signal quality computing units
332,432 selected cells, 340 loop phase computing units
350 system control units, 360 tilt control unit
370 focus control unit, 374 focus actuator
380 follow rail control module 386 follows the rail actuator
410 signal generators 434,434-1,434-2 arithmetic element
450 phase detectors, 520 servo control units
530 actuators, 540 error detection unit
610 bandpass filter, 620 digital units
630 XOR arithmetic elements, 640 smoothing filters
Embodiment
Please refer to Fig. 3, Fig. 3 is the synoptic diagram according to the control circuit of an optical storage of the present invention (optical storage device), wherein this optical storage is meant the device that is used for driving CD (optical disc), for example: digital multi-purpose CD-ROM drive (DVD drive), digital multi-purpose CD writer (DVDburner) ... etc.This control circuit includes: an optical read head (optical pickup) 310, one radiofrequency signal (RF signal) detecting unit 312, a focus error detection unit 314, a tracking error detecting unit 316, a radiofrequency signal quality computing unit 320, a loop phase computing unit 340, a system control unit 350, tilt (tilt) control module 360, focus on (focusing) control module 370, with one follow rail (tracking) control module 380.
One first embodiment as shown in Figure 4, loop phase computing unit 340 in this control circuit includes at least: a signal generator 410, selected cell 332 and 432, subtracter 434-1 and 434-2, with phase detectors 450, wherein subtracter 434-1 and 434-2 also can adopt other arithmetic element (as totalizer) to implement.System control unit can be selected one first loop or one second loop by selected cell 332 and 432.First loop is a focus servo control system, and it includes subtracter 434-1, focus control unit 370, focus actuator 374, focus error detection unit 314; And this second loop is a circulation orbital servo control system, and it includes subtracter 434-2, follows rail control module 380, follows rail actuator 386, tracking error detecting unit 316.According to present embodiment, focus actuator 374 is to be arranged in the middle of the optical read head shown in Figure 3 310 with following rail actuator 386.For the purpose of simplifying the description, Fig. 3 omit this control circuit part assembly such as signal generator 410, subtracter 434-1 and 434-2, focus actuator 374, follow rail actuator 386 and do not give demonstration.Yet this is not a limitation of the present invention.
According to the present invention, one closed loop phase place can be represented the phase differential between the two-phase place value, also can represent the level differences between two signals with this two-phase place value, promptly a phase place measures level, wherein the value of this phase differential measures the on duty with certain value (constant value) of level for this phase place, in fact just represents this phase differential so this phase place measures level.For example: if this two signal is respectively above-mentioned error signal and disturbing signal 412, have this two phase place respectively, then this phase place measurement level is exactly the level differences between this error signal and the disturbing signal 412.According to present embodiment, this a plurality of closed loops phase place is that a plurality of phase places measure level, all exports by output signal 342, and wherein each phase place measures the level that level is output signal 342.
Fig. 5 selects signal 331 to be in the synoptic diagram of the state in first or second state.When selecting signal 331 to be in first state, representative system control module 350 selects to measure the closed loop phase place of focus servo control systems, so subtracter 434 shown in Figure 5, servo control unit 520, actuator 530, error detection unit 540, error signal 542 are represented subtracter 434-1 shown in Figure 4, focus control unit 370, focus actuator 374, focus error detection unit 314, focus error signal FE respectively.When selecting signal 331 to be in second state, representative system control module 350 selects to measure the closed loop phase place of circulation orbital servo control system, so subtracter 434 shown in Figure 5, servo control unit 520, actuator 530, error detection unit 540 are represented subtracter 434-2 shown in Figure 4 respectively with error signal 542, follow rail control module 380, followed rail actuator 386, tracking error detecting unit 316, tracking error signal TE.
In present embodiment, disturbing signal 412 is disturbance (disturbance) signals that a waveform can be a square wave, and arithmetic element 434 is to be used for disturbing signal 412 and error signal 542 are subtracted each other, and exports operation result to phase detectors 450.In addition, but a plurality of closed loops phase place between phase detectors 450 error signal 542 and the disturbing signal 412, and by these a plurality of closed loops phase places of output signal 342 output, wherein this a plurality of closed loops phase place correspond respectively to optical read head 310 a plurality of controlled variable T0, T1 ..., T9.That is to say, by determining a controlled variable Ti to control optical read head 310 seriatim, and calculate closed loop phase place by phase detectors 450 corresponding to each controlled variable Ti, system control unit 350 just can obtain seriatim corresponding to these ten controlled variable T0, T1 ..., ten closed loop phase places of T9.According to these ten closed loop phase places, system control unit 350 can in these ten controlled variable T0, T1 ..., select a controlled variable Tx among the T9, and compensate and control the pitch angle of optical read head 310 by tilt control unit 360 with respect to disc according to controlled variable Tx.
The running of above-mentioned phase detectors 450 is described as follows.As shown in Figure 6, phase detectors 450 include: a bandpass filter 610, a digitizing (digitizing) unit 620, an XOR computing (exclusive OR, XOR) unit 630, with level and smooth (smooth) wave filter 640.Bandpass filter 610 filter error signals 542 are producing a bandpass filtered signal 611, and digital unit 620 produces a binary (binary) signals 621 according to bandpass filtered signal 611, and wherein binary signal 621 has a high level and a low level.In present embodiment, digital unit 620 is a chopper (slicer).630 of XOR arithmetic elements are carried out an XOR to produce a pulse signal 631 to disturbing signal 412 and binary signal 621, and wherein pulse measures of dispersion of high level width and low level width in one-period is promptly represented phase differential between disturbing signal 412 and the error signal 542 in the pulse signal 631.Smoothing filter 640 can use low-pass filter, in order to filtered pulse signal 631 to produce above-mentioned output signal 342.As previously described, each phase place of present embodiment measures the level that level is output signal 342, especially is that a closed loop transfer function (transfer function) phase place measures the level Δ
TF, it represents the phase of a closed loop transfer function
TF, wherein the phase differential that is equivalent between disturbing signal 412 and the error signal 542 of the level of output signal 342 takes absolute value, shown in following equation:
|φ
TF|＝Δ
TF*180°，-180°≤φ
TF≤0°；
Definite value 180 in this equation promptly can be used to carry out closed loop transfer function phase place and measures the level Δ
TFPhase with the closed loop transfer function
TFBetween conversion.So, in application of the present invention, can use this closed loop transfer function phase place to measure the level Δ
TFRepresent the phase of closed loop transfer function
TFTake absolute value.
The connected mode of each assembly by as shown in Figure 5, the phase of corresponding closed loop transfer function
TFCan illustrate by Fig. 7 with the curve of frequency f.Along with system control unit 350 in regular turn in controlled variable T0, T1 ..., T9 selects each controlled variable Ti, the phase of closed loop transfer function for use
TFWith the curve of frequency f originally can be as shown in Figure 7 curve 720, can move right gradually then and be changed to as shown in Figure 7 curve 710, retract left gradually more at last, for example move on to the position shown in the curve 720.As shown in Figure 7, the dotted line of the frequency f o by disturbing signal 412 respectively with curve 710 and 720 intersections in point 712 and 722.Therefore, along with system control unit 350 in regular turn in controlled variable T0, T1 ..., T9 selects each controlled variable Ti for use, the phase of aforesaid closed loop transfer function
TFOriginally can be point 722 as shown in Figure 7, can upwards move gradually then and be changed to as shown in Figure 7 point 712, retract downwards gradually more at last, for example move on to the some position shown in 722.A plurality of closed loops phase place that above-mentioned loop phase computing unit 340 is calculated (is that a plurality of closed loops transfer function phase place that loop phase computing unit 340 is calculated measures the level Δ
TF) be the distance that corresponds respectively to point (as putting 712 and 722) with the transverse axis of these curves that change one by one (as curve 710 and 720) and the mutual intersection of above-mentioned dotted line.
In present embodiment, but a plurality of radiofrequency signal index of quality (RF quality index) Q of the data field of the CD (optical disc) that radiofrequency signal quality computing unit 320 calculating optical memory storages are read
RFWherein these radiofrequency signal index of quality are corresponding to partial response signal noise ratio (partialresponse signal-to-noise ratio, PRSNR), continuous amplitude edge (SequencedAmplitude Margin, SAM), simulated bit error rate (simulated bit error rate, SBER).By determining a controlled variable Ti to control optical read head 310 seriatim, and calculate the radiofrequency signal index of quality by radiofrequency signal quality computing unit 320 corresponding to each controlled variable Ti, system control unit 350 just can obtain seriatim corresponding to these ten controlled variable T0, T1 ..., ten radiofrequency signal index of quality of T9.According to these ten radiofrequency signal index of quality, system control unit 350 can in these ten controlled variable T0, T1 ..., select a controlled variable Ty among the T9, and compensate and control the pitch angle of optical read head 310 by tilt control unit 360 with respect to CD according to controlled variable Ty, so that optical read head 310 reaches best operational effectiveness.What need be careful is, according to radiofrequency signal index of quality Q
RFThe optimization control parameter Ty that is determined measures the level Δ according to closed loop transfer function phase place usually
TFThe optimization control parameter Tx that is determined more can make optical read head 310 reach best operational effectiveness.In addition, radiofrequency signal index of quality Q
RFBe to be applicable to the optical disc data district, and closed loop transfer function phase place measure the level Δ
TFThen all be applicable to the data field and the non-data field of discs.Therefore, for an orbit radius r1 of CD, system control unit 350 can first calculation control parameter Tx and Ty between offset value delta T, then, for an orbit radius r 2 of CD, system control unit 350 can calculate closed loop transfer function phase place and measure the level Δ
TF, measure the level Δ according to closed loop transfer function phase place again
TFOptimization control parameter with offset value delta T calculating respective carter radius r 2.
Fig. 8 is that closed loop transfer function phase place measures the level Δ under the possible situation of present embodiment
TFAnd radiofrequency signal index of quality Q
RFCorrespond respectively to the synoptic diagram of two curves of controlled variable Ti.System control unit 350 record corresponding to these ten controlled variable T0, T1 ..., ten closed loop transfer function phase places of T9 measure the level Δs
TFAfterwards, just obtain as shown in Figure 8, closed loop transfer function phase place measures the level Δ
TFWith the curve 810 of the corresponding relation of controlled variable Ti, are minimum value in each data point of curve 810 wherein corresponding to the point 812 of controlled variable T4.System control unit 350 can in these ten controlled variable T0, T1 ..., select among the T9 controlled variable T4 as an optimization control parameter Tx.In addition, system control unit 350 record corresponding to these ten controlled variable T0, T1 ..., after ten radiofrequency signal index of quality of T9, just obtain curve 820 as shown in Figure 8, i.e. radiofrequency signal index of quality Q
RFWith the corresponding relation of controlled variable Ti, are minimum value in each data point of curve 820 wherein corresponding to the point 822 of controlled variable T6.System control unit 350 can in these ten controlled variable T0, T1 ..., select among the T9 controlled variable T6 as an optimization control parameter Ty.Under this situation, above-mentioned offset value delta T equals two transverse axis units of transverse axis as shown in Figure 8.Change in the example in one of present embodiment, if radiofrequency signal index of quality Q
RFOptimum value be maximal value (that is, radiofrequency signal index of quality Q
RFDownward with the curve recess of the corresponding relation of controlled variable Ti), then can be with radiofrequency signal index of quality Q
RFValue get negative sign make its optimum value be converted to minimum value (that is, radiofrequency signal index of quality Q
RFWith the curve recess of the corresponding relation of controlled variable Ti upwards).
The control method of the foregoing description can illustrate by Fig. 9 and process flow diagram shown in Figure 10, wherein Fig. 9 910 be respectively to be performed once in steps in step 910-1 and the 910-2 of Figure 10.Step shown in Figure 9 is described as follows.
Step 910S: beginning.
Step 912: start signal generator 410.
Step 914: execution in step 916-i and step 917-i, wherein i=0～(N-1).
Step 916-i: with controlled variable Ti control optical read head 310.
Step 917-i: record is corresponding to the closed loop phase place of controlled variable Ti.
Step 918: shutdown signal generator 410.
Step 920: seeking best closed loop phase place (is that a plurality of closed loops transfer function phase place that loop phase computing unit 340 is calculated measures the level Δ
TFOptimum value, be minimum value in present embodiment) pairing controlled variable Tx.
Step 922: if FLAG_INIT1=0 then enters step 924, otherwise, enter step 936.
Step 924: if DATA_AREA=1 then enters step 926, otherwise, enter step 934, wherein this step is to judge according to flag DATA_AREA, and it is the data field that the position is read in the DATA_AREA=1 representative at present, and it is non-data field that the position is read in the DATA_AREA=0 representative at present.
Step 926: seek best radiofrequency signal index of quality Q
RFPairing controlled variable Ty.
Step 928: calculate offset value delta T, wherein Δ T=Ty-Tx.
Step 930: make T=Ty.
Step 932: make FLAG_INIT1=1.
Step 934: make Δ T=0.
Step 936: make T=Tx+ Δ T.
Step 910E: finish.
In addition, step shown in Figure 10 is described as follows.
Step 904: if FLAG_INIT2=0 then enters step 906, otherwise, enter step 908.
Step 906: optical read head 310 is moved to a primary importance corresponding to radius r 1.
Step 910-1: decision is corresponding to the optimization control parameter T_r1 of radius r 1, and wherein optimization control parameter T_r1 is 9 of this execution graphs optimization control parameter T of gained after 910 in steps.
Step 940: storage radius r 1 and optimization control parameter T_r1.
Step 946: optical read head 310 is moved to the second place corresponding to radius r 2.
Step 910-2: decision is corresponding to the optimization control parameter T_r2 of radius r 2, and wherein optimization control parameter T_r2 is 9 of this execution graphs optimization control parameter T of gained after 910 in steps.
Step 950: storage radius r 2 and optimization control parameter T_r2.
Step 952: make FLAG_INIT2=1.
Step 908: carry out an interpolation (interpolation) computing or an extrapolation (extrapolation) computing according to radius r 1 and r2 and optimization control parameter T_r1 and T_r2, with the optimization control parameter (being the optimum value of controlled variable T) that determines a corresponding intended orbit radius r.
Please consult Figure 11, Figure 12, one second embodiment shown in Figure 13 simultaneously.This second embodiment is approximate with first embodiment, and its Discrepancy Description is as follows.As shown in figure 11, the input signal of above-mentioned phase detectors 450 is the output signal 435 of disturbing signal 412 and arithmetic element 434.Each phase place of present embodiment measures the level that level is the output signal 342 of phase detectors 450, especially is that a closed loop sensitivity function (sensitivity function) phase place measures the level Δ
SF, it represents the phase of a closed loop sensitivity function
SFClosed loop sensitivity function phase place measures the level Δ
SFPhase with the closed loop sensitivity function
SFRelation between (in the present embodiment being phase differential between disturbing signal 412 and the output signal 435) is shown in following equation:
φ
SF＝Δ
SF*180°，0°≤φ
SF≤180°；
Definite value 180 in this equation promptly can be used to carry out closed loop sensitivity function phase place and measures the level Δ
SFPhase with the closed loop sensitivity function
SFBetween conversion.Wherein, the phase of the closed loop sensitivity function of foundation second embodiment
SFWith the curve 730 and 740 of frequency f as shown in figure 12.System control unit 350 then foundation closed loop shown in Figure 13 sensitivity function phase place measures the level Δ
SFWith the maximal value 832 of each data point in the curve 830 of the corresponding relation of controlled variable Ti, and radiofrequency signal index of quality Q
RF Maximal value 842 with each data point in the curve 840 of the corresponding relation of controlled variable Ti decides above-mentioned optimization control parameter Tx and Ty.Change in the example in one of present embodiment, if radiofrequency signal index of quality Q
RFOptimum value be minimum value (that is, radiofrequency signal index of quality Q
RFWith the curve recess of the corresponding relation of controlled variable Ti upwards), then can be with radiofrequency signal index of quality Q
RFValue get negative sign make its optimum value be converted to maximal value (that is, radiofrequency signal index of quality Q
RFDownward with the curve recess of the corresponding relation of controlled variable Ti).
One of benefit of the present invention is, the component count that apparatus and method of the present invention are required to be used for calculating the closed loop phase place than be used in the known technology counter circuit level component count still less, and be easier to realize than known technology.
Another benefit of the present invention is, apparatus and method of the present invention can adopt in an optical disc data district corresponding to partial response signal noise ratio (partial response signal-to-noise ratio, PRSNR), continuous amplitude edge (Sequenced Amplitude Margin, SAM) or simulated bit error rate (simulatedbit error rate, SBER) the radiofrequency signal index of quality, the off-set value between optimization control parameter that is produced with compensation basis closed loop phase place and the optimization control parameter that produced according to the radiofrequency signal index of quality.Therefore, apparatus and method of the present invention also can accurately operate in the non-data field of CD.
The above only is preferred embodiment of the present invention, and all equalizations of being done according to the present patent application claim change and modify, and all should belong to the covering scope of patent of the present invention.
Claims (18)
1. the control circuit of an optical storage is characterized in that, comprises:
One servo-drive system, it has a circulation orbital servo control system or a focus servo control system, and this servo-drive system includes:
One servo control unit is used for compensating control, and this compensation is controlled to be radial skew control or focuses on the adjustment of balance;
One loop phase computing unit is coupled to this servo-drive system, is used for closed loop phase place according at least one this servo-drive system of error signal calculation of this servo-drive system; And
One system control unit is coupled to loop phase computing unit and this servo-drive system, is used for producing optimization control parameter according to the closed loop phase place, with by utilizing this servo control unit to compensate control;
Wherein, described loop phase computing unit comprises a signal generator, be used for producing the disturbing signal of one-period property, according to the closed loop phase place of described disturbing signal and the described servo-drive system of described error signal calculation, described optimization control parameter is at least one optimization control parameter that is determined according to a plurality of closed loops phase place that the loop phase computing unit calculates.
2. control circuit as claimed in claim 1, it is characterized in that, described system control unit is first optimization control parameter of one first orbit radius and second optimization control parameter to one second orbit radius on should CD on the corresponding CD of decision in a plurality of controlled variable, again according to described first, second orbit radius and first, second optimization control parameter carry out an interpolative operation or an extrapolation computing with the optimization control parameter that determines a corresponding intended orbit radius to compensate control.
3. control circuit as claimed in claim 1, it is characterized in that, a plurality of first phase places that described a plurality of closed loops phase place has one first orbit radius on the corresponding CD and a plurality of second phase places to one second orbit radius on should CD, described a plurality of first phase place has one first extreme value, this first extreme value is one first a tentative controlled variable in corresponding a plurality of controlled variable, and described control circuit includes in addition:
One radiofrequency signal quality computing unit is coupled to described system control unit, is used for calculating the best radiofrequency signal index of quality of corresponding first orbit radius, and this best radiofrequency signal index of quality is one first a predetermined control parameter in corresponding described a plurality of controlled variable;
Wherein said system control unit is to calculate a controlled variable off-set value according to the first predetermined control parameter and the first tentative controlled variable, and described system control unit is the optimization control parameter that decides corresponding second orbit radius according to described a plurality of second phase places and controlled variable off-set value.
4. control circuit as claimed in claim 3, it is characterized in that, described a plurality of second phase place has a secondary extremal, this secondary extremal is one second a tentative controlled variable in corresponding described a plurality of controlled variable, and described system control unit is the optimization control parameter that decides corresponding second orbit radius according to the second tentative controlled variable and controlled variable off-set value.
5. control circuit as claimed in claim 4 is characterized in that, the described second tentative controlled variable equals the described first tentative controlled variable.
6. control circuit as claimed in claim 3 is characterized in that, described system control unit determines that the first predetermined control parameter is the optimization control parameter of corresponding first orbit radius.
7. control circuit as claimed in claim 3 is characterized in that, the described best radiofrequency signal index of quality is corresponding to partial response signal noise ratio, continuous amplitude edge or simulated bit error rate.
8. control circuit as claimed in claim 1 is characterized in that, described loop phase computing unit includes in addition:
At least one arithmetic element, it is subtracter or totalizer, this arithmetic element is to be used for periodic disturbing signal input circulation orbital servo control system or focus servo control system, with periodic disturbing signal and error signal is subtracted each other or addition; And
One phase detectors are used for the periodic disturbing signal that the detection signal generator produces and the phase differential of error signal, and wherein this phase differential is the closed loop phase place.
9. control circuit as claimed in claim 8 is characterized in that, described phase detectors include in addition:
One bandpass filter is coupled to error detection unit, is used for the filter error signal to produce a bandpass filtered signal;
One digital unit is coupled to bandpass filter, is used for producing a binary signal according to bandpass filtered signal;
One XOR arithmetic element is coupled to digital unit, is used for disturbing signal and binary signal are carried out an XOR to produce a pulse signal; And
One smoothing filter is coupled to the XOR arithmetic element, is used for the filtered pulse signal to produce an output signal, and wherein this output signal level is corresponding to a phase place in described a plurality of phase places.
10. the control method of an optical storage is characterized in that, includes:
(a) according to the closed loop phase place of at least one this servo-drive system of error signal calculation of the servo-control system that includes a circulation orbital servo control system or a focus servo control system; And
(b) disturbing signal of generation one-period property according to the closed loop phase place of described disturbing signal and the described servo-drive system of described error signal calculation, produces optimization control parameter to compensate control according to the closed loop phase place;
Wherein said compensation is controlled to be radial skew control or focuses on the adjustment of balance, and described optimization control parameter is at least one optimization control parameter that is determined according to a plurality of closed loops phase place that step (a) is calculated.
11. control method as claimed in claim 10 is characterized in that, step (b) includes in addition:
First optimization control parameter of one first orbit radius and second optimization control parameter on the corresponding CD of decision in described a plurality of controlled variable to one second orbit radius on should CD; And
According to described first, second orbit radius and first, second optimization control parameter carry out an interpolative operation or an extrapolation computing with the optimization control parameter that determines a corresponding intended orbit radius to compensate control.
12. control method as claimed in claim 10, it is characterized in that, a plurality of first phase places that described a plurality of phase place has one first orbit radius on the corresponding CD and a plurality of second phase places to one second orbit radius on should CD, described a plurality of first phase place has one first extreme value, this first extreme value is one first a tentative controlled variable in corresponding described a plurality of controlled variable, and described control method includes in addition:
Calculate the best radiofrequency signal index of quality of corresponding first orbit radius, this best radiofrequency signal index of quality is one first a predetermined control parameter in corresponding described a plurality of controlled variable;
Wherein step (b) is calculated a controlled variable off-set value according to the first predetermined control parameter and the first tentative controlled variable in addition, and decides the optimization control parameter of corresponding second orbit radius according to described a plurality of second phase places and this controlled variable off-set value.
13. control method as claimed in claim 12, it is characterized in that, described a plurality of second phase place has a secondary extremal, this secondary extremal is one second a tentative controlled variable in corresponding described a plurality of controlled variable, and step (b) is to decide the optimization control parameter of corresponding second orbit radius according to the second tentative controlled variable and controlled variable off-set value.
14. control method as claimed in claim 13 is characterized in that, the described second tentative controlled variable equals the described first tentative controlled variable.
15. control method as claimed in claim 12 is characterized in that, described step (b) includes in addition:
Determine that the first predetermined control parameter is the optimization control parameter of corresponding first orbit radius.
16. control method as claimed in claim 10 is characterized in that, the described best radiofrequency signal index of quality is corresponding to partial response signal noise ratio, continuous amplitude edge or simulated bit error rate.
17. control method as claimed in claim 10 is characterized in that, described step (a) includes in addition:
With periodic disturbing signal input circulation orbital servo control system or focus servo control system; And
The disturbing signal of sense cycle and the phase differential of error signal, wherein phase differential is the closed loop phase place.
18. control method as claimed in claim 10 is characterized in that, described step (a) includes in addition:
(a-0) the filter error signal is to produce a bandpass filtered signal;
(a-1) produce a binary signal according to bandpass filtered signal;
(a-2) disturbing signal and binary signal are carried out an XOR to produce a pulse signal; And
(a-3) the filtered pulse signal is to produce an output signal, and wherein this output signal level is corresponding to a phase place in described a plurality of phase places.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100798417A CN100394491C (en) | 2005-06-29 | 2005-06-29 | Optical storing device control circuit and method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100798417A CN100394491C (en) | 2005-06-29 | 2005-06-29 | Optical storing device control circuit and method thereof |
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| CN1889179A CN1889179A (en) | 2007-01-03 |
| CN100394491C true CN100394491C (en) | 2008-06-11 |
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| US7663987B2 (en) * | 2007-04-14 | 2010-02-16 | Mediatek Inc. | Method and system for calibrating recording track offset of optical storage device |
| CN102495290B (en) * | 2011-12-28 | 2014-06-11 | 上海海事大学 | Obtaining apparatus for port impedance characteristic of alternating current power electronic module and obtaining method thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1207523A2 (en) * | 2000-11-17 | 2002-05-22 | Samsung Electronics Co., Ltd. | Error signal detection apparatus for optical recording/reproducing system |
| JP2004311006A (en) * | 2003-03-26 | 2004-11-04 | Matsushita Electric Ind Co Ltd | Tracking error detector |
| JP2004319072A (en) * | 2003-04-02 | 2004-11-11 | Matsushita Electric Ind Co Ltd | Tracking error detecting device |
| US20040228233A1 (en) * | 2003-04-02 | 2004-11-18 | Takashige Hiratsuka | Tracking error detection apparatus |
| CN1619667A (en) * | 2003-11-17 | 2005-05-25 | 威盛电子股份有限公司 | Method and device for adjusting a control parameter of a servo of an optical drive |
| CN1622207A (en) * | 2003-11-24 | 2005-06-01 | 联发科技股份有限公司 | Servo loop system identification device and optical disk player having said device |
-
2005
- 2005-06-29 CN CNB2005100798417A patent/CN100394491C/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1207523A2 (en) * | 2000-11-17 | 2002-05-22 | Samsung Electronics Co., Ltd. | Error signal detection apparatus for optical recording/reproducing system |
| JP2004311006A (en) * | 2003-03-26 | 2004-11-04 | Matsushita Electric Ind Co Ltd | Tracking error detector |
| JP2004319072A (en) * | 2003-04-02 | 2004-11-11 | Matsushita Electric Ind Co Ltd | Tracking error detecting device |
| US20040228233A1 (en) * | 2003-04-02 | 2004-11-18 | Takashige Hiratsuka | Tracking error detection apparatus |
| CN1619667A (en) * | 2003-11-17 | 2005-05-25 | 威盛电子股份有限公司 | Method and device for adjusting a control parameter of a servo of an optical drive |
| CN1622207A (en) * | 2003-11-24 | 2005-06-01 | 联发科技股份有限公司 | Servo loop system identification device and optical disk player having said device |
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