CN101552017B - Method and device for distinguishing the disk kinds - Google Patents
Method and device for distinguishing the disk kinds Download PDFInfo
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- CN101552017B CN101552017B CN2009101375028A CN200910137502A CN101552017B CN 101552017 B CN101552017 B CN 101552017B CN 2009101375028 A CN2009101375028 A CN 2009101375028A CN 200910137502 A CN200910137502 A CN 200910137502A CN 101552017 B CN101552017 B CN 101552017B
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Abstract
The invention discloses a method and device for distinguishing the disk kind, comprising distinguishing whether a compact disk is a blank compact disk or not; detecting the phases of the first signal of the compact disk and the difference phase detection signal when the compact disk is not a blank compact disk; comparing the phases of the first signal and the difference phase detection signal and distinguishing whether the compact disk is an organic dyestuff data compact disk or a inorganic dyestuff data compact disk based on the phase comparison result; the first signal is any one of the mainpush pull signal, secondary push pull signal, difference push pull signal or arbitrary combinations of the above signals. The method and device for distinguishing the disk kind can distinguish whethe r the compact disk is an organic dyestuff data compact disk or a inorganic dyestuff data compact disk, thereby preventing the optical storage device from being loaded with the wrong parameters.
Description
Technical field
The present invention relates to a kind of disc types discrimination technology, and be particularly related to a kind of method and device thereof of differentiating disc types.
Background technology
Blue light (Blu-ray) memory technology development descends though the price of Blu-ray Disc is existing so far, but still be higher than present main flow the multifunctional digital CD (digital versatile disc, DVD).For this reason, blu-ray standard has been released a key name in BD-R Format V1.2 in 2007 be the new technology of LTH (Low toHigh), and the cost of blue light burning CD is declined to a great extent.
The LTH technology is to use organic compound (that is organic dyestuff) as data Layer, and the LTH technology is mainly in the mode of describing the data of optical disk record, the reflectivity that its formulation writes the data field is uprised by low, and therefore the CD that uses the LTH technology to write is called LTH CD (that is organic dyestuff CD).
Fig. 1 is the Blu-ray Disc structural representation.Please refer to Fig. 1, the zone that Blu-ray Disc writes the data mark is called the MARK district, is not called the SPACE district and Blu-ray Disc writes the zone of data mark.In the organic dyestuff CD, the reflectivity in MARK district is after writing, and its reflectivity can uprise, and far above the SPACE district that does not write the data mark.Because the reflectivity in MARK district can uprise (Low toHigh) by low, so the CD of kind is called as the LTH CD.
The conventional blu-ray CD is that to adopt metallic compound (that is inorganic dyestuff) then be HTL (High to Low) pattern as the CD of data Layer, is called HTL CD (that is inorganic dyestuff CD).In the inorganic dyestuff CD, the data mark writes the low reflection after regional reflectivity can be become write by the high change of reflection before writing, that is the reflectivity in MARK district can be by high step-down (High to Low).With at present, the form that all is to use HTL of general blue light burning CD when the read-write system of CD-ROM device runs into the CD of LTH form suddenly, then must have corresponding judgment mechanism, to introduce suitable setting and specific servo action.
Because organic dyestuff CD and two kinds of CDs of inorganic dyestuff CD are very big in the difference in reflectivity that writes the zone,,, must can right judgement go out disc types earlier for broadcast and burning CD that can be correct therefore for CD-ROM device manufacturer.Then, make the optimal setting of parameter, tracking error signal (TE, Tracking Error) for example, the parameter of focus error signal servosignals such as (FE, Focus Error) according to disc types.And above-mentioned servosignal all can must be adjusted different parameters (for example yield value) because of the disc types difference, to guarantee the stable of CD signal quality.And, because the problem of difference in reflectivity, radio frequency (radio frequency, RF) signal (that is data-signal) also can be because of the disc types difference, and different signal intensities is arranged, therefore the parameter of data-signal multiplier (-icator) (RF EQ) with the employed laser power of optical read/write head, also must be done necessary correction because of disc types is different.
In addition, the more important thing is this two kinds of CDs, its position that writes data is also inequality, and the organic dyestuff CD is an IN GROOVE writing mode, and the inorganic dyestuff CD is an ON GROOVE writing mode.CD-ROM device use differential push-pull (Differential Push Pull, DPP) signal is locked rail, and the organic dyestuff CD will be different with the lock rail position on the inorganic dyestuff CD.Therefore,, change the lock rail position of CD drive, CD just may take place to play (that is reading) and situation generation that can't burning (that is writing) when the action of not making optical disc judgment in advance.
Summary of the invention
The invention provides a kind of method of differentiating disc types, can differentiate the CD that reads is organic dyestuff CD or inorganic dyestuff CD.
The present invention also provides a kind of device of differentiating disc types, can be organic dyestuff CD or inorganic dyestuff CD according to CD, loads different parameters to produce corresponding servosignal.
The present invention proposes a kind of method of differentiating disc types, and it comprises the following steps: to judge whether a CD is blank CD; When this CD non-blank-white CD, detect one first signal of this CD and the phase place of differential phase detection signal; And the phase place of this first signal and this differential phase detection signal compared, and to differentiate this CD according to this phase place comparative result be an organic dyestuff optical data disk or an inorganic dyestuff optical data disk; Described first signal is to promote mainly any of drawing in signal, inferior push-pull signal, the differential push-pull signal, or the combination in any of above three kinds of signals.
In one embodiment of this invention, the method for differentiation disc types more comprises: when this CD is blank CD, detect the radiofrequency signal of this CD and/or the amplitude of radio frequency ripple signal; Whether the amplitude of described radiofrequency signal of foundation and/or radio frequency ripple signal is greater than a default threshold value, and differentiating described CD is an organic dyestuff blank CD or an inorganic dyestuff blank CD.
In one embodiment of this invention, above-mentioned this CD of phase judgment according to this first signal and this differential phase detection signal is that the step of an organic dyestuff optical data disk or an inorganic dyestuff optical data disk comprises:
When this promotes mainly that to draw signal and/or this differential push-pull signal be identical with the phase place of this differential phase detection signal, and/or, judge that this CD is this inorganic dyestuff optical data disk when this time push-pull signal when being opposite with the phase place of this differential phase detection signal;
When this promotes mainly that to draw signal and/or this differential push-pull signal be opposite with the phase place of this differential phase detection signal, and/or, judge that this CD is this organic dyestuff optical data disk when this time push-pull signal when being identical with the phase place of this differential phase detection signal.
Perhaps according to the optically read element arrangements difference of optical read/write head, above-mentioned this CD of phase judgment according to this first signal and this differential phase detection signal is that the step of an organic dyestuff optical data disk or an inorganic dyestuff optical data disk comprises:
When this promotes mainly that to draw signal and/or this differential push-pull signal be identical with the phase place of this differential phase detection signal, and/or, judge that this CD is this organic dyestuff optical data disk when this time push-pull signal when being opposite with the phase place of this differential phase detection signal;
When this promotes mainly that to draw signal and/or this differential push-pull signal be opposite with the phase place of this differential phase detection signal, and/or, judge that this CD is this inorganic dyestuff optical data disk when this time push-pull signal when being identical with the phase place of this differential phase detection signal.
The present invention also proposes a kind of device of differentiating disc types, and it comprises an optical read/write head, is used to read a CD, and exports a plurality of electric signal according to the situation that reads of this CD, and wherein those electric signal comprise a radiofrequency signal; One digital signal processor couples this optical read/write head, and handling those electric signal is one first signal, a differential phase detection signal and a radio frequency ripple signal; When this CD was not blank CD, relatively the phase place of this first signal and this differential phase detection signal obtained a phase place comparative result; And a control module, couple this digital signal processor, differentiating this CD according to described phase place comparative result is an organic dyestuff optical data disk or an inorganic dyestuff optical data disk; And the differentiation result of above-mentioned this CD of foundation loads corresponding parameters to produce a corresponding servosignal; Described first signal is to promote mainly any of drawing in signal, inferior push-pull signal, the differential push-pull signal, or the combination in any of above three kinds of signals.
In one embodiment of this invention, whether greater than a default threshold value, differentiate this CD is an organic dyestuff blank CD or an inorganic dyestuff blank CD to above-mentioned control module according to the amplitude in this radiofrequency signal and/or this radio frequency ripple signal.
Based on above-mentioned, the method of differentiation disc types of the present invention and device thereof, can differentiate the CD that reads is organic dyestuff CD or inorganic dyestuff CD, and be organic dyestuff CD or inorganic dyestuff CD according to CD, load different parameters to produce corresponding servosignal, make the lock rail that optical storage can be correct.Thus, can avoid the parameter of optical storage, take place and cause CD can't play with situation that can't burning because of loading error.
Characteristics of the present invention, no matter be blank CD, or the CD of record data, before the lock rail, CD be can judge and organic dyestuff CD or inorganic dyestuff CD belonged to, and use the introducing suitable parameter, make the CD rail of locking in the tram, can avoid locking the rail mistake, or reduce the time of trial and error.
For above-mentioned feature and advantage of the present invention can be become apparent, embodiment cited below particularly, and conjunction with figs. is described in detail below.
Description of drawings
Fig. 1 is the structural representation of Blu-ray Disc.
Fig. 2 A is the system schematic of optical storage according to an embodiment of the invention.
Fig. 2 B is the structure and the signal waveform synoptic diagram thereof of organic dyestuff optical data disk for CD among Fig. 2 A.
Fig. 2 C is the structure and the signal waveform synoptic diagram thereof of inorganic dyestuff optical data disk for CD among Fig. 2 A.
Fig. 2 D is the structure and the signal waveform synoptic diagram thereof of organic dyestuff blank CD for CD among Fig. 2 A.
Fig. 2 E is the structure and the signal waveform synoptic diagram thereof of inorganic dyestuff blank CD for CD among Fig. 2 A.
Fig. 3 A is the system schematic of the digital signal processor 220 of Fig. 2 A.
Fig. 3 B is the system schematic of the signal amplitude detecting device 320 of Fig. 3 A.
Fig. 3 C is the system schematic of the signal phase comparer 330 of Fig. 3 A.
Fig. 4 is the system schematic of the photodetector 214 of Fig. 2 A.
Fig. 5 is the process flow diagram of disc types method of discrimination according to an embodiment of the invention.
The main element symbol description:
10: CD
200: optical storage
210: optical read/write head
211: the blue laser light source
212: spectroscope
213: object lens
214: photodetector
215: focus driver
220: digital signal processor
230: control module
310: operation processing unit
320: the signal amplitude detecting device
321: multiplexer
325: demultiplexer
322: the signal maximum detecting device
323: the signal minimum detecting device
324: subtracter
330: the signal phase comparer
331: the first analog-digital converters
332: the second analog-digital converters
333: arithmetic logic unit
340: storer
401,402,403: beam sensor
S501～S515: the step of the disc types method of discrimination of one embodiment of the invention
Embodiment
Because the position that writes data of organic dyestuff burning CD and inorganic dyestuff burning CD is different, and the reflection of its CD is also inequality, so reading or burning blue light (Blu-ray, BD) during CD, must judge earlier read or the kind of the CD of burning is organic dyestuff CD or inorganic dyestuff CD.Wherein, Blu-ray Disc can for the one time write-in-type blue light CD (Blu-ray Recordable Disc, BD-R) maybe can repeat the write-in-type blue light CD (Blu-ray Re-Writeable Disc, BD-RW).
Fig. 2 A is the system schematic of optical storage according to an embodiment of the invention.Please refer to Fig. 2 A, in the present embodiment, the device of differentiating disc types is to be example with optical storage 200, and optical storage 200 comprises optical read/write head 210, digital signal processor 220 and control module 230.Optical read/write head 210 can receive from the servosignal of control module 230 and CD 10 is focused on and locks rail, CD 10 is read to produce a plurality of electric signal, wherein CD 10 can be blue light burning CD, and electric signal can comprise radiofrequency signal (radio frequency, RF).Electric signal A, B, C, D and radiofrequency signal RF that digital signal processor 220 meetings are provided according to optical read/write head 210, calculate differential phase detection signal (Differential Phase Detection, DPD), differential push-pull signal (Differential Push-Pull, DPP) and radio frequency ripple signal (Radio Frequencyripple, RFRP).And when CD is record data CD (being the non-blank-white CD), digital signal processor 220 can be when obtaining differential phase detection signal DPD, the phase place of differential phase detection signal DPD and differential push-pull signals DP P relatively, obtain a phase place comparative result for control module 230 as the foundations of differentiation disc types (can but the absolute value of phase differential that is not limited to obtain differential phase detection signal DPD and differential push-pull signals DP P as the phase place comparative result); When CD is blank CD, thus since blank CD not burning data can not form differential phase detection signal DPD, therefore detect the amplitude of radiofrequency signal RF and/or radio frequency ripple signal RFRP, to differentiate the foundation of disc types as control module 230; Whether control module 230 surpasses the kind that default threshold value is differentiated CD according to the amplitude of radiofrequency signal RF and/or radio frequency ripple signal RFRP, if the amplitude of this radiofrequency signal RF and/or this radio frequency ripple RFRP signal is greater than this threshold value, then this CD is the organic dyestuff blank CD; Otherwise this CD is the inorganic dyestuff blank CD.And digital signal processor 220 can be with above-mentioned comparative result or the output of detected amplitude.230 signals of being exported according to digital signal processor 220 of control module, and a plurality of parameter (for example seeking rail and focusing) produce servosignal and carry out the read-write of CD 10 with the control optical read/write head.
See optical read/write head 210 again, optical read/write head 210 comprises blue laser light source 211, spectroscope 212, object lens 213, photodetector 214 and focus driver 215.In optical read/write head 210, blue laser light source 211 can receive the power that determines whether launch light beam and adjust light beam from the servosignal of control module 230.Blue laser light source 211 emitted light beams can be sent to object lens 213 via spectroscope 212, are passing through object lens 213 post-concentration Jiao on the data Layer of CD 10.The light beam that focuses on CD 10 data Layers can be reflected, and produces beam signal, and beam signal can conduct on the photodetector 214 via spectroscope 212.And photodetector 214 can be converted to electric signal A, B, C, D and radiofrequency signal RF with beam signal.Focus driver 215 can receive the position of adjusting object lens 213 from the servosignal of control module 230 equally, focuses on the data Layer of CD 10 so that the light beam of blue laser light source 211 can be correct.
When CD 10 is when writing the CD of data, when then optical storage 200 reads CD 10 after focusing, can produce differential phase detection signal DPD, differential push-pull signals DP P and radio frequency ripple signal RFRP at least.When CD 10 is the words of organic dyestuff LTH optical data disk, then the absolute value of the phase differential of the differential phase detection signal DPD that produced of digital signal processor 220 and differential push-pull signals DP P is about 180 degree, that is differential phase detection signal DPD and differential push-pull signals DP P are anti-phase, its signal waveform is shown in Fig. 2 B, and Fig. 2 B is the structure and the signal waveform synoptic diagram thereof of organic dyestuff optical data disk for CD among Fig. 2 A.When CD 10 is the words of inorganic dyestuff HTL optical data disk, its differential phase detection signal DPD and differential push-pull signals DP P meeting same-phase (that is the absolute value of phase differential is about 0 degree), its signal waveform is shown in Fig. 2 C, and Fig. 2 C is the structure and the signal waveform synoptic diagram thereof of inorganic dyestuff optical data disk for CD among Fig. 2 A.
Please refer to Fig. 2 B and Fig. 2 C, the zone that wherein is used for writing data is called groove (Groove), but not the zone that is used for writing data is called base station (Land).In organic dyestuff optical data disk and inorganic dyestuff optical data disk, because the ditch slot definition difference that data write, the groove position that the organic dyestuff optical data disk writes is near shaven head, the groove position that the inorganic dyestuff optical data disk writes is away from shaven head, so the signal slope of differential push-pull signals DP P can be opposite, but differential phase detection signal DPD can be identical, because the slope direction of differential phase detection signal DPD is only relevant with the data writing position.So, because the groove location definition difference of organic dyestuff optical data disk and inorganic dyestuff optical data disk, so the differential phase detection signal DPD of inorganic dyestuff optical data disk is identical with the phase place of differential push-pull signals DP P, and the differential phase detection signal DPD of organic dyestuff optical data disk is opposite with the phase place of differential push-pull signals DP P.Therefore, control module 230 CD 10 that can utilize this characteristic to be used for differentiating to write data is organic dyestuff optical data disk or inorganic dyestuff optical data disk.And control module 230 is after differentiation CD 10 is organic dyestuff optical data disk or inorganic dyestuff optical data disk, can load pre-set corresponding parameters, with the servosignal that produces corresponding CD 10 kinds and change its write-in policy (that is control rule).
What deserves to be mentioned is, because differential push-pull signals DP P draws signal (MainPush-Pull by promoting mainly, MPP) deduct time push-pull signal (Sub-Push-Pull, SPP) produce, so differential push-pull signals DP P can with promote mainly that to draw signal MPP phase place identical, opposite with the phase place of inferior push-pull signal SPP.Therefore in other embodiments, also can relatively promote mainly the absolute value of the phase differential of drawing signal MPP or inferior push-pull signal SPP and differential phase detection signal DPD, and differentiate the kind of CD 10 thus, this point is in explaining after a while.
When CD 10 does not write data (that is CD 10 is blank CD), because digital signal processor 220 can't produce effective differential phase detection signal DPD, so optical storage can produce differential push-pull signals DP P, radio frequency and radio frequency ripple signal RFRP at least reading CD 10.And, because the reflectivity of organic dyestuff CD can be than the reflectivity height of inorganic dyestuff CD, so the signal intensity that the organic dyestuff CD produces (meaning signal intensity into radio frequency and/or radio frequency ripple signal RFRP at this) also can be than inorganic dyestuff CD height, wherein the reflectivity of organic dyestuff CD is defined as 16～35%, and the reflectivity of inorganic dyestuff CD is defined as 11～24%.
Fig. 2 D is the structure and the signal waveform synoptic diagram thereof of organic dyestuff LTH blank CD for CD among Fig. 2 A, and Fig. 2 E is the structure and the signal waveform synoptic diagram thereof of inorganic dyestuff HTL blank CD for CD among Fig. 2 A.Please refer to Fig. 2 D and Fig. 2 E, see by knowing in the diagram, read radiofrequency signal RF that the organic dyestuff blank CD produced and the amplitude of radio frequency ripple signal RFRP, greater than reading radiofrequency signal RF that the inorganic dyestuff blank CD produced and the amplitude of radio frequency ripple signal RFRP.Therefore, radio frequency that optical storage 200 can these two kinds of CDs or the amplitude of radio frequency ripple signal RFRP are got an intermediate value (can but be not limited to the radio frequency of two kinds of CDs or the mean value of radio frequency ripple signal RFRP amplitude) as threshold value, and greater than this threshold value, differentiate CD 10 and be organic dyestuff blank CD or inorganic dyestuff blank CD according to the degree that whether changes among radiofrequency signal RF and/or the radio frequency ripple signal RFRP.After differentiating CD 10 and be organic dyestuff blank CD or inorganic dyestuff blank CD, control module 230 can load corresponding parameters equally, with the servosignal that produces corresponding CD 10 kinds and change its write-in policy (that is controlling rule).
Fig. 3 A is the system schematic of the digital signal processor 220 of Fig. 2 A.Please refer to Fig. 3 A, digital signal processor 220 comprises operation processing unit 310, signal amplitude detecting device 320, signal phase comparer 330 and storer 340.Operation processing unit 310 couples optical read/write head 210, is used for carrying out computing to obtain differential push-pull signals DP P, differential phase detection signal DPD and radio frequency ripple signal RFRP according to electric signal A, B, C, D and radiofrequency signal RF.Signal amplitude detecting device 320 couples operation processing unit 310, is used to detect the amplitude of radiofrequency signal RF or radio frequency ripple signal RFRP, and with detected amplitude output.
Signal phase comparer 330 couples operation processing unit 310, is used for the phase place of comparison differential phase detection signal DPD and differential push-pull signals DP P, and the output phase comparative result.Storer 340 couples signal amplitude detecting device 320 and signal phase comparer 330, be used to store the phase place comparative result of amplitude, differential phase detection signal DPD and the differential push-pull signals DP P of threshold value, radiofrequency signal RF and radio frequency ripple RFRP, and corresponding CD all kinds read or write parameter.Control module 230 can read the data in the storer 340, differentiates the kind of CD, produces servosignal to load corresponding parameters.In other embodiments, signal phase comparer 330 also can be drawn the comparison that signal MPP or inferior push-pull signal SPP make phase place with promoting mainly with differential phase detection signal DPD, and storer 340 can be stored its phase place comparative result equally, and be organic dyestuff CD or inorganic dyestuff CD so as to differentiating CD, produce corresponding servosignal with further.
In addition, signal amplitude detecting device 320 and signal phase comparer 330 can be realized by the entity circuit at this, make the processing speed of digital signal processor 220 can therefore not reduce.And in other embodiments, also signal amplitude detecting device 320 and signal phase comparer 330 can be written as program, in the firmware that is written in digital signal processor 220.Thus, can not change the hardware design, and realize the signal amplitude detecting device 320 of the embodiment of the invention and the function of signal phase comparer 330.
Next, following usefulness one circuit description signal amplitude detecting device 320.Fig. 3 B is the system schematic of the signal amplitude detecting device 320 of Fig. 3 A.Please refer to Fig. 3 B, signal amplitude detecting device 320 comprises multiplexer 321, signal maximum detecting device 322, signal minimum detecting device 323, subtracter 324 and demultiplexer 325.Multiplexer 321 received RF signal RF and radio frequency ripple signal RFRP, and, wherein select the generation of signal Ssel to be produced by operation processing unit 310 according to selecting signal Ssel decision output radiofrequency signal RF or radio frequency ripple signal RFRP.Signal maximum detecting device 322 couples multiplexer 321, is used to detect the maximal value of the signal that is received.Signal minimum detecting device 323 couples multiplexer 321, is used to detect the minimum value of the signal that is received.The positive input terminal of subtracter 324 couples signal maximum detecting device 322, and its negative input end couples signal minimum detecting device 323, with the difference and the output of the output signal of the output signal that obtains signal maximum detecting device 322 and signal minimum detecting device 323.Demultiplexer 325 couples the output terminal of subtracter, is the amplitude A mp of radiofrequency signal RF to export difference according to selection signal Ssel decision
RFOr the amplitude A mp of radio frequency ripple signal RFRP
RFRP
For instance, when selecting signal Ssel to be the accurate position of logic high voltage, multiplexer 321 can be exported radiofrequency signal RF.Signal maximum detecting device 322 and signal minimum detecting device 323 can write down maximal value and the minimum value of radiofrequency signal RF respectively.Then, subtracter 324 can deduct its minimum value with the maximal value of radiofrequency signal RF, and the difference of being exported is the amplitude A mp of radiofrequency signal RF
RFDemultiplexer 325 is then same according to selecting signal Ssel, with the amplitude A mp with radiofrequency signal RF
RFExport corresponding output terminal to.In addition, be the accurate position of logic low-voltage when selecting signal Ssel, then signal amplitude detecting device 320 can be obtained the amplitude of radio frequency ripple signal RFRP, and with the amplitude A mp of radio frequency ripple signal RFRP
RFRPExport corresponding output terminal to, its circuit running is to above-mentioned similar, so repeat no more.
Then, following signal phase comparer 330 is further described.Fig. 3 C is the system schematic of the signal phase comparer 330 of Fig. 3 A.Please refer to Fig. 3 C, signal phase comparer 330 comprises first analog-digital converter 331, second analog-digital converter 332 and arithmetic logic unit 333.First analog-digital converter 331 receives differential phase detection signal DPD, determines the accurate position of logic voltage of its output with the voltage quasi position of foundation differential phase detection signal DPD.Second analog-digital converter 332 receives differential push-pull signals DP P, determines the accurate position of logic voltage of its output with the voltage quasi position of foundation differential push-pull signals DP P.Arithmetic logic unit 333 determines the phase place comparative result S of its output according to the accurate position of the logic voltage of analog-digital converter 331 and 332 outputs
CPThe accurate position of logic voltage.Wherein arithmetic logic unit 333 for example is a mutual exclusion or XOR (XOR) door.
The differential phase detection signal DPD and the differential push-pull signals DP P that please refer to Fig. 2 B illustrate, in first analog-digital converter 331, when the voltage quasi position of differential phase detection signal DPD during greater than voltage Va, the accurate position of first analog-digital converter, 331 meeting output logic high voltages, when the voltage quasi position of differential phase detection signal DPD during less than voltage Va, first analog-digital converter 331 can the accurate position of output logic low-voltages.In second analog-digital converter 332, when the voltage quasi position of difference push-pull signal DPP during greater than voltage Vb, the accurate position of second analog-digital converter, 332 meeting output logic high voltages, when the voltage quasi position of difference push-pull signal DPP during less than voltage Vb, second analog-digital converter 332 can the accurate position of output logic low-voltages.
Because the differential phase detection signal DPD of Fig. 2 B and the phase place of differential push-pull signals DP P are opposite, so the accurate position of the logic voltage of analog-digital converter 331 and 332 outputs can be opposite.Therefore, the phase place comparative result S of arithmetic logic unit 333 outputs
CPBe the accurate position of logic high voltage, it is anti-phase representing differential phase detection signal DPD and differential push-pull signals DP P.In like manner can push away, when the phase place of differential phase detection signal DPD and differential push-pull signals DP P was identical, the accurate position of the logic voltages of analog-digital converter 331 and 332 outputs can be identical.Therefore, the phase place comparative result S of arithmetic logic unit 333 outputs
CPBe the accurate position of logic low-voltage, representing differential phase detection signal DPD and differential push-pull signals DP P is homophase.What deserves to be mentioned is that above-mentioned voltage quasi position is for being used for explanation, and is non-with the restriction embodiments of the invention.
In optical storage 200, can be different because of optically read element (PDIC) design of optical read/write head, and make obtained differential phase detection signal DPD different with above-mentioned explanation with the phase relation of differential push-pull signals DP P.Fig. 4 is the system schematic of the photodetector 214 of Fig. 2 A.According to one of them embodiment of the present invention, the beam signal that left half of 401a received of promoting mainly the producing method of drawing signal MPP and be main beam detector (MainBeam PD) 401 cuts the beam signal that right half of 401b receives by subtracter E0, that is the positive input terminal of subtracter E0 couples the left half of 401a of beam detector 401, and the negative input end of subtracter E0 couples the right half of 401b of beam detector; The beam signal that left half of 402a received of an auxilliary beam detector (Side Beam PD) 402 cuts the beam signal that right half of 402b receives by subtracter E1, that is the positive input terminal of subtracter E1 couples the left half of 402a of beam detector 402, and the negative input end of subtracter E1 couples the right half of 402b of beam detector; The beam signal that left half of 403a received of another auxilliary beam detector (Side Beam PD) 403 cuts the beam signal that right half of 403b receives by subtracter E2, that is the positive input terminal of subtracter E2 couples the left half of 403a of beam detector 403, and the negative input end of subtracter E2 couples the right half of 403b of beam detector.
At this moment, when CD 10 is the organic dyestuff optical data disk, it promotes mainly the waveform of drawing signal MPP can be similar in appearance to the waveform of the differential push-pull signals DP P of Fig. 2 B, opposite with differential phase detection signal DPD phase place.When CD 10 is the inorganic dyestuff optical data disk, it promotes mainly the waveform of drawing signal MPP can be similar in appearance to the waveform of the differential push-pull signals DP P of Fig. 2 C, identical with differential phase detection signal DPD phase place.In addition, because differential push-pull signals DP P can draw signal MPP and deducts time push-pull signal SPP and produce by promoting mainly, because of the waveform of this time push-pull signal SPP1 and SPP2 can be anti-phase with differential push-pull signals DP P, can obtain to understand with reference to diagram, just can utilize time push-pull signal SPP1 and SPP2 to differentiate the kind of CD equally.Wherein, amplifier G1 and G2 are used to adjust the size of signal, totalizer E3 is used to obtain total inferior push-pull signal SPP, totalizer E4 is used for the left and right half of beam signal additions that receive of main beam detector 401 are obtained radiofrequency signal RF, and subtracter E5 is used for drawing signal MPP and deducting inferior push-pull signal SPP and obtain differential push-pull signals DP P with promoting mainly.
According to another embodiment of the invention, sense on beam detector 401,402 and 403 changes, become and make the right half of beam signal that is received of beam detector 401,402 and 403 cut the half of beam signal that is received in a left side, that is the positive and negative two ends of subtracter E0, E1 and E2 couple exchange, can make that beam detector 401,402 and 403 signals that produce are opposite with above-mentioned explanation.At this moment, when CD 10 is the organic dyestuff optical data disk, its promote mainly draw signal MPP and differential phase push-pull signal DPP all can with differential phase detection signal DPD same-phase; Inferior push-pull signal SPP1 and SPP2 can with differential phase detection signal DPD antiphase.When CD 10 is the inorganic dyestuff optical data disk, it is promoted mainly and draws signal MPP and differential phase push-pull signal DPP can be anti-phase with differential phase detection signal DPD; Inferior push-pull signal SPP1 or SPP2 can with differential phase detection signal DPD homophase.Therefore, can be by relatively promoting mainly the phase place of drawing signal MPP, inferior push-pull signal SPP1 or SPP2 and differential phase detection signal DPD, according to disc types and promote mainly the phase relation of drawing signal MPP, inferior push-pull signal SPP1 or SPP2 and differential phase detection signal DPD, just can differentiate CD 10 and be organic dyestuff optical data disk or inorganic dyestuff optical data disk.And photodetector can produce electric signal A, B, C, D and radiofrequency signal RF in circuit running back, and its circuit running can be understood by diagram, so do not explain in this.
It must be noted that, above-mentioned Fig. 4 for explanation promote mainly draw signal MPP and time push-pull signal SPP1 and SPP2 can be because its generation circuit different, and cause the change of differential phase push-pull signal DPP and differential phase detection signal DPD phase place, be not to be used to limit the applied circuit of the embodiment of the invention.Yet constant is, when reading organic dyestuff optical data disk or inorganic dyestuff optical data disk, the phase relation of both differential phase push-pull signal DPP and differential phase detection signal DPD can be opposite each other, differentiate the kind of CD thus, the differential phase push-pull signal here also can be drawn signal MPP or the replacement of inferior push-pull signal with promoting mainly.Further specify, under the situation of same optical read/write head, can be (for example according to first signal, differential phase push-pull signal DPP, promote mainly and draw signal MPP or inferior push-pull signal SPP) and secondary signal is (for example, differential phase detection signal DPD) absolute value of phase differential judges whether differential phase push-pull signal DPP is identical with the phase place of differential phase detection signal DPD, when the phase place of the branch phase place of being on duty push-pull signal DPP and differential phase detection signal DPD is identical, the absolute value of described phase differential be approximately 0 degree (be described phase differential with the absolute value of the difference of 0 degree less than with the absolute value of 180 differences of spending), when the phase place of the branch phase place of being on duty push-pull signal DPP and differential phase detection signal DPD is opposite, the absolute value of described phase differential be approximately 180 degree (be described phase differential absolute value and the differences of 180 degree absolute value less than with the absolute value of difference of 0 degree), thereby the differentiation CD is organic dyestuff CD or inorganic dyestuff CD.According to one of them embodiment of the present invention,, judge that then CD is the organic dyestuff CD when the absolute value of the phase differential of differential phase detection signal DPD and differential phase push-pull signal DPP is about 0 when spending; And be about 180 when spending when the absolute value of phase differential, then be the inorganic dyestuff CD.Because time push-pull signal SPP and differential phase push-pull signal DPP are anti-phase, so in like manner can know by inference, with the situation of above-mentioned same optical read/write head under, when the absolute value of the phase differential of SPP and DPD is about 0 when spending, can judge that CD is the inorganic dyestuff CD; And be about 180 when spending when the absolute value of phase differential, then be the organic dyestuff CD.When using different optical read/write heads, its PDIC arranges when changing to some extent, above-mentioned phase differential may be just opposite with the relation of disc types, but still can be the kind that 0 degree or 180 degree are distinguished organic dyestuff CD or inorganic dyestuff CD by the absolute value of phase differential.
Then, can be by the foregoing description, gather and be the disc types method of discrimination, below explain according to this again.Fig. 5 is the process flow diagram of the disc types method of discrimination of one of them embodiment according to the present invention.Please refer to Fig. 5, at first step S501 can judge whether the CD of inserting optical storage is blank CD.It should be noted that to utilize signals such as detecting RF or DPD whether to exist with as judging whether CD is the foundation of blank CD,, just do not add explanation at this because this mode is that to know the personage of this technology known.When CD is not a blank CD, that is the judged result of step S501 is "No", and then whether execution in step S502 is same-phase to judge differential phase detection signal DPD and differential push-pull signals DP P.When differential phase detection signal DPD and differential push-pull signals DP P are not same-phase, that is the judged result of step S502 is "No", then shown in step S503, represents that this CD is an organic dyestuff LTH optical data disk.Then, execution in step S504 reads parameter and writes parameter to set the LTH correlation parameter to allow optical storage be loaded with the organic dye CD.Then shown in step S505, optical storage can enter LTH burning or playing flow.
Get back to step S502, when differential phase detection signal DPD and differential push-pull signals DP P are same-phase, that is the judged result of step S502 is "Yes", then shown in step S506, represents that this CD is an inorganic dyestuff HTL optical data disk.Then, execution in step S507 reads parameter and writes parameter to set the HTL correlation parameter to allow optical storage load inorganic dyestuff.Then shown in step S508, optical storage can enter HTL burning or playing flow.
See step S501 again, when CD is a blank CD, that is the judged result of step S501 is "Yes", and then whether execution in step S509 is less than or equal to threshold value with the amplitude of judging radio frequency or radio frequency ripple RFRP signal.When the amplitude of radio frequency or radio frequency ripple RFRP signal is less than or equal to threshold value, that is the judged result of step S509 is that "Yes" is (during practical application, situation in the time of also the amplitude of radio frequency or radio frequency ripple RFRP signal can being equaled threshold value is set at "No"), then shown in step S510, represent that this CD is an inorganic dyestuff HTL blank CD.Then, execution in step S511 sets the HTL correlation parameter to allow optical storage loading inorganic dyestuff write parameter.Then shown in step S512, optical storage can enter HTL burning flow process.
Get back to step S509, when the amplitude of radio frequency or radio frequency ripple RFRP signal greater than threshold value, that is the judged result of step S509 is "No", then shown in step S513, represents that this CD is an organic dyestuff LTH blank CD.Then, execution in step S514 writes parameter and sets the LTH correlation parameter to allow optical storage be loaded with organic dye.Then shown in step S515, optical storage can enter LTH burning flow process.
In step S501, the action that can read before optical storage is locked rail to CD when the result who reads can't produce differential phase detection signal DPD or radiofrequency signal RF, judges that then this CD is a blank CD; Otherwise, judge that then this CD is not blank CD.In addition, above-mentioned differential push-pull signal can be promoted mainly and draw signal MPP or inferior push-pull signal SPP and substitute, and can reach the effect of optical disc judgment equally.
What deserves to be mentioned is, in other embodiments, can be because the design difference of photodetector, and may make differential phase detection signal and differential push-pull signal phase place also thereby change, make the judged result change of step S502.Just, when differential phase detection signal and differential push-pull signal are same-phase, then representing CD is the organic dyestuff optical data disk; Otherwise then representing CD is the inorganic dyestuff optical data disk.Fig. 5 in order to illustrate that embodiments of the invention illustrate, is not to be used to limit scope of the present invention only.
In sum, the optical storage of the embodiment of the invention and disc types method of discrimination thereof, when the optical data disk of record is arranged, phase difference by differential phase detection signal DPD and differential push-pull signals DP P is organic dyestuff CD or inorganic dyestuff CD to differentiate optical data disk, when blank CD, and be organic dyestuff CD or inorganic dyestuff CD to differentiate CD whether greater than default threshold value according to the amplitude of radio frequency or radio frequency ripple signal.The parameter that then loads pre-set corresponding different discs kind makes optical storage to carry out correct lock rail to CD to produce corresponding servosignal.Thus, can avoid the parameter of optical storage, take place and cause CD can't play with situation that can't burning because of loading error.
Though the present invention with embodiment openly as above; so it is not to be used to limit the present invention; have in the technical field under any and know the knowledgeable usually; without departing from the spirit and scope of the present invention; when doing a little change and retouching, so protection scope of the present invention is as the criterion when looking claims person of defining.
Claims (11)
1. method of differentiating disc types is used to differentiate the kind of Blu-ray Disc, comprising:
Judge whether a CD is blank CD;
When this CD non-blank-white CD, detect one first signal of this CD and the phase place of differential phase detection signal;
The phase place of this first signal and this differential phase detection signal is compared, and to differentiate this CD according to this phase place comparative result be an organic dyestuff optical data disk or an inorganic dyestuff optical data disk;
Described first signal is to promote mainly any of drawing in signal, inferior push-pull signal, the differential push-pull signal, or the combination in any of above three kinds of signals;
When judging that this CD is blank CD, detect the radiofrequency signal of this CD and/or the amplitude of radio frequency ripple signal; And
Whether the amplitude of described radiofrequency signal of foundation and/or radio frequency ripple signal is greater than a default threshold value, and differentiating described CD is an organic dyestuff blank CD or an inorganic dyestuff blank CD.
2. the method for claim 1 is characterized in that, the step that described this CD of phase judgment according to this first signal and this differential phase detection signal is an organic dyestuff optical data disk or an inorganic dyestuff optical data disk comprises:
When this promotes mainly that to draw signal and/or this differential push-pull signal be identical with the phase place of this differential phase detection signal, and/or, judge that this CD is this inorganic dyestuff optical data disk when this time push-pull signal when being opposite with the phase place of this differential phase detection signal; And
When this promotes mainly that to draw signal and/or this differential push-pull signal be opposite with the phase place of this differential phase detection signal, and/or, judge that this CD is this organic dyestuff optical data disk when this time push-pull signal when being identical with the phase place of this differential phase detection signal;
Perhaps according to the optically read element arrangements difference of optical read/write head, the step that described this CD of phase judgment according to this first signal and this differential phase detection signal is an organic dyestuff optical data disk or an inorganic dyestuff optical data disk comprises:
When this promotes mainly that to draw signal and/or this differential push-pull signal be identical with the phase place of this differential phase detection signal, and/or, judge that this CD is this organic dyestuff optical data disk when this time push-pull signal when being opposite with the phase place of this differential phase detection signal; And
When this promotes mainly that to draw signal and/or this differential push-pull signal be opposite with the phase place of this differential phase detection signal, and/or, judge that this CD is this inorganic dyestuff optical data disk when this time push-pull signal when being identical with the phase place of this differential phase detection signal.
3. method as claimed in claim 1 or 2 is characterized in that, this relatively the step of the phase place of this first signal and this differential phase detection signal comprise:
Calculate the absolute value of the phase differential of this first signal and this differential phase detection signal;
When the absolute value of the difference of the absolute value of this phase differential and 0 degree less than with the absolute value of the differences of 180 degree the time, judge that this first signal is identical with the phase place of this differential phase detection signal; When the absolute value of the differences of the absolute value of this phase differential and 180 degree less than with the absolute value of the difference of 0 degree the time, judge that this first signal is opposite with the phase place of this differential phase detection signal.
4. method as claimed in claim 1 or 2, it is characterized in that, whether the amplitude of described radiofrequency signal of described foundation and/or radio frequency ripple signal greater than default threshold value, and the step of differentiating described CD and be an organic dyestuff blank CD or an inorganic dyestuff blank CD comprises:
If the amplitude of this radiofrequency signal and/or this radio frequency ripple signal is greater than this threshold value, then this CD is the organic dyestuff blank CD;
If the amplitude of this radiofrequency signal and/or this radio frequency ripple signal is less than or equal to this threshold value, then this CD is the inorganic dyestuff blank CD.
5. device of judging disc types is used to differentiate the kind of Blu-ray Disc, it is characterized in that, comprising:
One optical read/write head is used to read a CD, and exports a plurality of electric signal according to the situation that reads of this CD, and wherein those electric signal comprise a radiofrequency signal;
One digital signal processor couples this optical read/write head, and handling those electric signal is one first signal, a differential phase detection signal and a radio frequency ripple signal; When this CD was not blank CD, relatively the phase place of this first signal and this differential phase detection signal obtained a phase place comparative result; And
One control module couples this digital signal processor, and differentiating this CD according to described phase place comparative result is an organic dyestuff optical data disk or an inorganic dyestuff optical data disk; And the differentiation result of above-mentioned this CD of foundation loads corresponding parameters to produce a corresponding servosignal;
Described first signal is to promote mainly any of drawing in signal, inferior push-pull signal, the differential push-pull signal, or the combination in any of above three kinds of signals;
Wherein,
When this digital signal processor is blank CD when this CD, detect the amplitude of this radiofrequency signal and/or this radio frequency ripple signal;
Whether greater than a default threshold value, differentiate this CD is an organic dyestuff blank CD or an inorganic dyestuff blank CD to this control module according to the amplitude of this radiofrequency signal and/or this radio frequency ripple signal.
6. device as claimed in claim 5 is characterized in that described optical read/write head comprises a photodetector; This photodetector comprises main beam detector and auxilliary beam detector;
It is that an organic dyestuff optical data disk or an inorganic dyestuff optical data disk are meant that this control module is differentiated this CD according to this phase place comparative result:
This control module is when this promotes mainly that to draw signal and/or this differential push-pull signal be identical with the phase place of this differential phase detection signal, and/or, judge that this CD is this inorganic dyestuff optical data disk when this time push-pull signal when being opposite with the phase place of this differential phase detection signal; And
This control module is when this promotes mainly that to draw signal and/or this differential push-pull signal be opposite with the phase place of this differential phase detection signal, and/or, judge that this CD is this organic dyestuff optical data disk when this time push-pull signal when being identical with the phase place of this differential phase detection signal;
Perhaps according to the optically read element arrangements difference of optical read/write head, it is that an organic dyestuff optical data disk or an inorganic dyestuff optical data disk are meant that this control module is differentiated this CD according to this phase place comparative result:
This control module is when this promotes mainly that to draw signal and/or this differential push-pull signal be identical with the phase place of this differential phase detection signal, and/or, judge that this CD is this organic dyestuff optical data disk when this time push-pull signal when being opposite with the phase place of this differential phase detection signal; And
This control module is when this promotes mainly that to draw signal and/or this differential push-pull signal be opposite with the phase place of this differential phase detection signal, and/or, judge that this CD is this inorganic dyestuff optical data disk when this time push-pull signal when being identical with the phase place of this differential phase detection signal.
7. as claim 5 or 6 described devices, it is characterized in that the phase place comparative result that this digital signal processor obtains is meant:
Obtain the absolute value of the phase differential of this first signal and this differential phase detection signal; When the absolute value of the difference of the absolute value of this phase differential and 0 degree less than with the absolute value of the differences of 180 degree the time, the phase place comparative result of acquisition is that this first signal is identical with the phase place of this differential phase detection signal; When the absolute value of the differences of the absolute value of this phase differential and 180 degree less than with the absolute value of the difference of 0 degree the time, the phase place comparative result of acquisition is that this first signal is opposite with the phase place of this differential phase detection signal.
8. as claim 5 or 6 described devices, it is characterized in that, whether greater than a default threshold value, differentiate this CD is that an organic dyestuff blank CD or an inorganic dyestuff blank CD are meant to this control module according to the amplitude of this radiofrequency signal and/or this radio frequency ripple signal:
This control module is when the amplitude of this radiofrequency signal and/or this radio frequency ripple signal during greater than this threshold value, and differentiating this CD is the organic dyestuff blank CD; When the amplitude of this radiofrequency signal and/or this radio frequency ripple signal is less than or equal to this threshold value, differentiating this CD is the inorganic dyestuff blank CD.
9. as claim 5 or 6 described devices, it is characterized in that this digital signal processor comprises:
One operation processing unit couples this optical read/write head, is used for carrying out computing to produce this first signal, this differential phase detection signal and this radio frequency ripple signal according to those electric signal;
One signal amplitude detecting device couples this operation processing unit, is used to detect the amplitude of this radiofrequency signal and/or this radio frequency ripple signal;
One signal phase comparer couples this operation processing unit, is used for the relatively phase place of this first signal and this differential phase detection signal, obtains this phase place comparative result; And
One storer, couple this signal amplitude detector and this signal phase comparer, be used to store the amplitude of this default threshold value, this radiofrequency signal and/or this radio frequency ripple signal and this phase place comparative result of this first signal and this differential phase detection signal.
10. device as claimed in claim 8 is characterized in that, this signal amplitude detector comprises:
One multiplexer receives this radiofrequency signal and this radio frequency ripple signal and one and selects signal, and exports this radiofrequency signal or this radio frequency ripple signal according to this selection signal deciding;
One signal maximum detecting device couples this multiplexer, is used to detect the maximal value of the signal that is received;
One signal minimum detecting device couples this multiplexer, is used to detect the minimum value of the signal that is received;
One subtracter, its positive input terminal couple this signal maximum detecting device, and its negative input end couples this signal minimum detecting device, with a difference and the output of the output signal of the output signal that obtains this signal maximum detecting device and this signal minimum detecting device; And
One demultiplexer couples the output terminal of this subtracter, is the amplitude of this radiofrequency signal or the amplitude of this radio frequency ripple signal to select this difference of signal deciding according to this.
11. device as claimed in claim 8 is characterized in that, this signal amplitude detector comprises:
One first analog-digital converter receives this first signal;
One second analog-digital converter receives this secondary signal; And
One arithmetic logic unit, couple this first and this second analog-digital converter, be used for according to this first and the output signal of this second analog-digital converter produce this phase place comparative result.
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| EP1626397A2 (en) * | 1999-12-02 | 2006-02-15 | Samsung Electronics Co., Ltd. | Apparatus for generating a track cross signal |
| CN1942935A (en) * | 2005-01-24 | 2007-04-04 | 松下电器产业株式会社 | Optical disc device |
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