CN100371999C - Detecting system and method for identifying optic storage medium recording area - Google Patents
Detecting system and method for identifying optic storage medium recording area Download PDFInfo
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- CN100371999C CN100371999C CNB2005101086301A CN200510108630A CN100371999C CN 100371999 C CN100371999 C CN 100371999C CN B2005101086301 A CNB2005101086301 A CN B2005101086301A CN 200510108630 A CN200510108630 A CN 200510108630A CN 100371999 C CN100371999 C CN 100371999C
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Abstract
The present invention relates to an optical distinguishing system for distinguishing different record areas on an optical storing medium. The optical distinguishing system comprises an optical head, a signal adder and a sum comparator, wherein the optical head is provided with a light source for providing an incident beam to a data recording area and a header label recording area on an optical memory medium, and a corresponding reflected light beam is generated. The optical head comprises a left detecting module and a right detecting module, can detect the received reflected light beam, and can generate a group of left detecting signals and a group of right detecting signals correspondingly. The signal adder is used for adds the amplitude values of the right detection signals and the amplitude values of the left detection signal to generate a sum signal. The sum comparator compares the sum signal with a preset sum reference signal so as to obtain a sum comparison signal, and whether the detected reflected light beam is from the data record area or the header recording area can be determined according to the sum comparison signal.
Description
The application is on October 16th, 2002 to the application number of Patent Office of the People's Republic of China's application is the case of dividing an application that 02145872.3 name is called the application of " detection system and the method for differentiating the recording areas of optic storage medium ".
Technical field
The present invention is relevant for a kind of optics judgement system, in order to differentiate the different recording regions on the optic storage medium.
Background technology
See also Fig. 1, Fig. 1 is the structural representation in optical disc storage zone.The general known formula digital audio/video disk (DVD-RAM) that rewrites is to write down various data with two kinds of storage track 13, they are respectively a protruding storage track (land storage track) and a depression storage track (groovestorage track), two kinds of tracks all can be in order to the storage data, no matter and be any track, can be divided into central part 15 and periphery position 16, both sides again, and the data that each section is complete are classified as one section storage area (sector) 10, each section storage area 10 can be further divided into the data recorded area (dataarea) 12 of the header record district (header) 11 of recording address information with recording address data and storage audio-visual data.The recording mode of header record district 11 and data recorded area 12 all be with signaling point (pit) 14 imprintings on storage track 13, the configuration of the signaling point 14 on the signaling point 14 in header record district 11 and the data recorded area 12 is also inequality.At data recorded area 12, the signaling point 14 of audio-visual data is the central part 15 that is recorded in track 13, yet in header record district 11,14 of the signaling points of address information are recorded in the peripheral position 16 of track 13, and the signaling point 14 of positional information is because of storage track 13 differences at place, arrangement mode in storage track 13 both sides is also inequality, protruding storage track with the depression storage track arrangement mode just in time opposite.
The light source that reads that sends from optical head generally is divided into four parts, the locking position of optical head is in the centre of track, if during optical head reads data log district, from the signal that CD reflection is returned, two part additions of the same side (being all left side or right side), become two groups of signal values, two groups of signal values subtract each other just can equal 0; If optical head is when reading header area, two groups of signal values of returning from CD reflection subtract each other just can not equal 0, can learn that by this signal Processing the zone that optical head is just reading is header record district 11 or data recorded area 12.
The known system that reads the zone in order to the detection optical head, the detection light beam of returning from CD reflection is through producing a detection signal after the computing, after the process arithmetical unit is handled detection signal with above-mentioned compute mode, via a low-pass filter (LPF) filtering noise, produce a low-pass filter signal, this low-pass filter signal is compared with the predetermined reference value in the comparer of the comparer of high threshold values and low valve valve again, produces a high threshold values and a low valve valve comparison signal.At two comparison signal waveforms is not 0 zone, and the expression optical head is reading header area; Detecting whether high threshold values comparison signal produce earlier than low valve valve comparison signal is not 0 waveform, can learn that just this track is protruding storage track or depression storage track.
It more than is known orbit information method of discrimination, but above-mentioned detection technique is when being based upon optical head and being locked in the centre of track, if it is not 0 o'clock that optical head is not locked into the centre and the tracking error of track, high threshold values and low valve valve comparison signal just can produce error, make audio-video optical disk system produce mistake for the interpretation of data of optical disk.This situation is especially with optical head the most normal generation when the header area migration data recorded area, because the situation that this moment, optical head shook easily makes to follow the tracks of to produce deviation.
So, need a kind ofly to revise the system of differentiating error, not whether influenced in that track is Centromedian the position by optical head, can both interpretation go out correct data.The present invention provides a scheme that solves promptly at this problem.
Summary of the invention
The purpose of this invention is to provide a kind of detection system and method for differentiating the optic storage medium recording areas, avoid because of the optical head of optics audio/video because be not locked in the track centre, and produce the error of data read aspect.
The present invention is a kind of optics judgement system, and this system can be further divided into first judgement system and second judgement system, in order to differentiate the different recording regions on the optic storage medium.One storage track direction of this optic storage medium is provided with a plurality of storage areas.Each storage area can be divided into a central part and periphery position, both sides.First storage area includes a data recorded area writing down a numerical data, and a header record district is to write down an address information.This numerical data is stored in the central part of this data recorded area, and this address information is stored in the peripheral position in this header record district.
First judgement system in this optics judgement system comprises an optical head, a signal totalizer and always adds comparer.This optical head has a light source providing an incident beam to data recorded area and header record district, and via a plurality of modulation, and produce a corresponding folded light beam.This optical head be arranged at optic storage medium at a distance of a preset distance part, and can be locked in the central part of storage area substantially, to detect this folded light beam along this storage track direction.This optical head comprises a left detection module and a right-hand detection module.This left detection module is arranged at the left side of this optical head along the storage track direction, can detect received folded light beam, and one group of left detection signal of corresponding generation.This right-hand detection module is arranged at the right side of this optical head along the storage track direction, can detect received folded light beam, and one group of right-hand detection signal of corresponding generation.This signal totalizer is used for the left detection signal of generation that this optical head detects and the amplitude of right-hand detection signal are always added, to produce a total plus signal.This always adds comparer and is used for this total plus signal and the predetermined reference signal that always adds are compared, and always adds comparison signal to obtain one.
Always adding comparison signal can be data recorded area or the header record district that comes from optic storage medium in order to the decision folded light beam that optical head detected.
Second judgement system of the present invention comprises an optical head, a signal subtraction device, a band pass filter means.This optical head has a light source providing an incident beam to data recorded area and header record district, and via a plurality of modulation, and produce a corresponding folded light beam.This optical head be arranged at optic storage medium at a distance of a preset distance part, and can be locked in the central part of storage area substantially, detect this folded light beam with direction along storage track.This optical head comprises a left detection module and a right-hand detection module.This left detection module is arranged at the left side of this optical head along the storage track direction, can detect received folded light beam, and one group of left detection signal of corresponding generation.This right-hand detection module is arranged at the right side of this optical head along the storage track direction, can detect received folded light beam, and one group of right-hand detection signal of corresponding generation.This signal subtraction device is used for the left detection signal and the right-hand detection signal of generation that this optical head detects subtracted each other program through a prearranged signal, to produce a subtracted signal.This band pass filter means is used for the high frequency of this subtracted signal and low frequency part filtering in addition, to obtain a bandpass filtered signal.
Bandpass filtered signal can be protruding storage track or the depression storage track that comes from optic storage medium in order to the decision folded light beam that optical head detected.
As from the foregoing, the present invention utilizes two groups of judgement systems to do the work of differentiation respectively for the header record district in the CD, data recorded area, protruding storage track and depression storage track, not only can finish the work of differentiation, more can avoid optical head because of the differentiation error of offset to generation.
Can be further understood by the following detailed description and accompanying drawings about the advantages and spirit of the present invention.
Description of drawings
Fig. 1 is the structural representation in optical disc storage zone.
Fig. 2 is the calcspar according to first judgement system 20 of the present invention and second judgement system 30.
Fig. 3 is the corresponding relation figure according to threshold values comparison signal of the present invention and recording areas.
Fig. 4 is the method flow diagram according to first judgement system 20 of the present invention.
Fig. 5 A and 5B are the method flow diagram according to second judgement system 30 of the present invention.
The drawing reference numeral explanation
10: 30: the second judgement systems of storage area
11: header record district 33: the signal subtraction device
12: data recorded area 34: bandpass filter
13: storage track 341: low-pass filter
14: signaling point 342: Hi-pass filter
15: the central part 35 of storage track: high threshold values comparer
16: the peripheral position 36 of storage track: low valve valve comparer
20: the first judgement system SS: total plus signal
21: light source SC: always add comparison signal
22: optical head SD: subtracted signal
222: left detection module SL: low-pass filter signal
224: right-hand detection module SH: bandpass filtered signal
23: signal totalizer HC: high threshold values comparison signal
24: always add comparer LC: the low valve valve comparison signal
Embodiment
The objective of the invention is providing a kind of optics to judge system, to differentiate the different recording regions on the optic storage medium.This optic storage medium includes at least one protruding storage track (land storagetrack) and at least one depression storage track (groove storage track), and each bar track all can be divided into a central part and both sides periphery position.This optic storage medium can be one can rewrite formula digital multi-purpose CD (DVD-RAM).
A storage track 13 as shown in Figure 1, it can be divided into central part 16 and periphery position 16, both sides.Storage track 13 is provided with a plurality of storage areas (sector) 10, and each storage area 10 can be divided into a central part 15 and a peripheral position 16.Each storage area 10 includes a data recorded area (data area) 12 writing down digital audio-video data, and a header record district (header) 11 is to write down an address information.This numerical data is with the central part 15 of digital store in data recorded area 12.This address information also includes a plurality of position and is stored in the periphery position 16, both sides in header record district 11.
Optics judgement system of the present invention can be further divided into first judgement system and second judgement system.See also Fig. 2, Fig. 2 is the calcspar according to first judgement system 20 of the present invention and second judgement system 30.First judgement system 20 comprise an optical head 22, a signal totalizer 23, with one always add comparer 24.Light sources 21 in the optical head 22 be in order to provide an incident beam to the header record district 11 with data recorded area 12, and via a plurality of modulation, and produce a corresponding folded light beam.Optical head 22 be arranged at this optic storage medium at a distance of a preset distance part, and can be locked in the central part 15 of storage area 10 substantially, detect this folded light beam with direction along storage track 13.
Aforesaid right-hand detection module 224 also is divided into two sub-detecting devices (not demonstrating among Fig. 2), is respectively second detecting device and the 3rd detecting device.This second detecting device is arranged at the right lateral side of optical head 22 along storage area 10, can detect along the received folded light beam of the right lateral side of storage area 10, and corresponding generation one second detection signal.The 3rd detecting device is arranged at the forward right side of optical head 22 along storage area 10, can detect along the received folded light beam of the forward right side of storage area 10, and corresponding generation 1 the 3rd detection signal.Signal totalizer 23 receive and with the amplitude of the first, second, third and the 4th detection signal with always to add, to produce total plus signal SS.
Please continue referring to Fig. 2, second judgement system 30 of the present invention is in order to differentiate the different storage track 13 on the optic storage medium.Second judgement system 30 comprises an optical head 22, a signal subtraction device 33, a band pass filter means 34, one high threshold values comparer 35 and a low valve valve comparer 36.The light source 21 and the optical head 22 of second judgement system 30 promptly is respectively the light source 21 and optical head 22 of first judgement system 20.Signal subtraction device 33 is used for optical head 22 is detected left detection signal and the right-hand detection signal that produces, and subtracts each other program through a prearranged signal, to produce a subtracted signal SD.It is optical head 22 to be detected the amplitude sum of the first and the 4th detection signal that produces and the amplitude sum of the second and the 3rd detection signal is subtracted each other that this prearranged signal subtracts each other program, with generation subtracted signal SD.Band pass filter means 34 is used for the high frequency of subtracted signal SD and low frequency part filtering in addition, to obtain a bandpass filtered signal SH.High threshold values comparer 35 is used for a bandpass filtered signal SH and a high threshold criteria signal of being scheduled to are compared, to obtain a high threshold values comparison signal HC.Low valve valve comparer 36 is used for a bandpass filtered signal SH and a low valve valve reference signal of being scheduled to are compared, to obtain a low valve valve comparison signal LC.Second pulsating wave according to bandpass filtered signal SH is that high threshold values comparison signal HC of generation or low valve valve comparison signal LC can determine the folded light beam that optical head 22 is detected after relatively, is protruding storage track or the depression storage track that comes from optic storage medium.If second pulsating wave of bandpass filtered signal SH produces low valve valve comparison signal LC after relatively, then be protruding storage track, otherwise, then be the depression storage track.
Comprise a low-pass filter 341 and a Hi-pass filter 342 in the band pass filter means 34 of second judgement system 30.Low-pass filter 341 is used for the HFS filtering in addition of subtracted signal SD, to obtain a low-pass filter signal SL.Hi-pass filter 342 is used for the low frequency part filtering in addition of low-pass filter signal SL, to obtain bandpass filtered signal SH.Low-pass filter signal SL herein is a kind of block signal (step signal), and bandpass filtered signal SH is a kind of pulse signal (pluse signal).
In another specific embodiment, this signal subtraction program is optical head 22 to be detected the phase place sum of the second and the 4th detection signal that produces, and the phase place sum of the first and the 3rd detection signal subtracts each other, with generation subtracted signal SD.And wherein, the second and the 4th detection signal is in-phase signal (in-phasesignals), and the first and the 3rd detection signal is an in-phase signal, and subtracted signal SD then is a phase difference detection (Differential Phase Detection, DPD) signal.
See also Fig. 3, the signal waveforms that Fig. 3 draws for the comparison signal that first judgement system 20 and second judgement system 30 according to Fig. 2 produce.By can finding out among Fig. 3, always first judgement system 20 produced add comparison signal SC, the waveform in header record district 11 is not 0, so as long as detecting waveform is not 0 place, just expression is header record district 11 herein.Otherwise if optical head 22 is reading of data in data recorded area 12 just, and then waveform is shown as 0.Low-pass filter 341 with the HFS filtering after, produce low-pass filter signal SL, 11 can to produce two be not 0 waveform one on the other in the header record district, this two is not that the distance of 0 waveform can not change because of the tracking error of optical head 22.Again via after the part filtering of Hi-pass filter 342 with low frequency, produce bandpass filtered signal SH, can be in the header record district 11 with data recorded area 12, and in the header record district 11 about arrange the junction and produce three pulsating waves.These three pulsating waves are relatively produced high threshold values comparison signal HC and low valve valve comparison signal LC in the back via high threshold values comparer 35 and low valve valve comparer 36 respectively, if second pulsating wave of bandpass filtered signal SH produces low valve valve comparison signal LC after relatively, then represent optical head 22 to be sitting on the protruding storage track and read information; Otherwise,, then represent optical head 22 to be sitting on the depression storage track and read information if second pulsating wave of bandpass filtered signal SH produces high threshold values comparison signal HC after relatively.
See also Fig. 4, Fig. 4 is the method flow diagram according to first judgement system 20 of the present invention.Below detailed description is applied to method of discrimination on first judgement system 20 of system of the present invention.
S41: provide an incident beam to data recorded area and header record district, and via a plurality of modulation, and produce a folded light beam;
S42: provide an optical head be arranged at optic storage medium at a distance of a preset distance part, and can be locked in the central part of storage area substantially, to detect this folded light beam along the storage track direction;
S43: the left detection signal of generation that this optical head detects and the amplitude of right-hand detection signal are always added, to produce a total plus signal;
S44: will this total plus signal and the predetermined reference signal that always adds compare, always add comparison signal to obtain one; And
S45: always adding comparison signal according to this can be data recorded area or the header record district that comes from optic storage medium in order to the folded light beam that determines that this optical head detects.
See also Fig. 5 A and 5B, it is the method flow diagram according to second judgement system 30 of the present invention.Method of the present invention comprises the following step:
S51: provide an incident beam to data recorded area and header record district, and via a plurality of modulation, and produce a corresponding folded light beam;
S52: provide an optical head be arranged at optic storage medium at a distance of a preset distance part, and can be locked in the central part of storage area substantially, detect this folded light beam with direction along storage track;
S53: left detection signal and right-hand detection signal with generation that this optical head detects, subtract each other program through a prearranged signal, to produce a subtracted signal;
S54: with the HFS filtering in addition of this subtracted signal, to obtain a low-pass filter signal;
S55: with the low frequency part filtering in addition of this low-pass filter signal, to obtain a bandpass filtered signal;
S56: this bandpass filtered signal and a high threshold criteria signal of being scheduled to are compared, to obtain a high threshold values comparison signal;
S57: this bandpass filtered signal and a low valve valve reference signal of being scheduled to are compared, to obtain a low valve valve comparison signal; And
S58: according to this high threshold values comparison signal and this low valve valve comparison signal, can determine the folded light beam that this optical head detects, be protruding storage track or the depression storage track that comes from optic storage medium.
The mode of known optical head detection optical recording medium, the central part of lock reord track accurately, if the tracking of optical head has error, differentiation for orbital region will be wrong, even influence data read continue carry out, so System and method for of the present invention improves this problem significantly, has high industry applications; Also not solve this error at once, and differentiate the method for posting field fast, so judgement system of the present invention has novelty significantly owing in the known technology; First and second judgement system of the present invention, utilize the part that can not be subjected to the tracking error influence in the optical detector signal, compared, differentiated, obtain the tram of the track that optical head reading, system design for a kind of innovation, advanced person, so without doubt, the present invention also has progressive naturally.
By the above detailed description of preferred embodiments, be to wish to know more to describe feature of the present invention and spirit, and be not to come category of the present invention is limited with above-mentioned disclosed preferred embodiment.On the contrary, its objective is that hope can contain in the category of protection domain of being disposed at of various changes and tool equivalence institute of the present invention desire application.Therefore, the category of the protection domain that the present invention applied for should be done the broadest explanation according to above-mentioned explanation, contains the configuration of all possible change and tool equivalence to cause it.
Claims (20)
1. optics judgement system, in order to differentiate the different storage track on the optic storage medium, include at least one protruding storage track and at least one depression storage track on this optic storage medium, each storage track all is divided into a central part and periphery position, both sides, and all include a data recorded area to write down a numerical data, and one the header record district to write down an address information, this numerical data comprises a plurality of position and is stored in the central part of this data recorded area along the direction of this storage track, this address information also comprises a plurality of position and is stored in the periphery position, both sides in this header record district along the direction of this storage track, in a protruding storage area and the address information in the header record district of a depression storage area, the sequencing at this periphery position, both sides that is stored in is also inequality, and this optics judgement system comprises:
One optical head, be arranged at this optic storage medium at a distance of a preset distance part, and be locked in the central part of a storage area substantially, detect a folded light beam with direction along this storage track, this optical head comprises:
One light source, in order to providing an incident beam to this data recorded area and this header record district, and via this modulation of a plurality of, and produce corresponding this folded light beam;
One left detection module is arranged at the left side of this optical head along this storage track direction, is used to detect received folded light beam, and one group of left detection signal of corresponding generation; And
One right-hand detection module is arranged at the right side of this optical head along this storage track direction, is used to detect received folded light beam, and one group of right-hand detection signal of corresponding generation;
One signal totalizer is used for this group left detection signal of generation that this optical head detects and this are organized right-hand detection signal, subtracts each other program through a prearranged signal, to produce a corresponding subtracted signal; And
One band pass filter means, being used for high frequency and low frequency part filtering in addition with this subtracted signal, is to come from this a projection storage track of this optic storage medium or a bandpass filtered signal of this depression storage track with the folded light beam that obtains being used to determine this optical head to be detected.
2. optics judgement system as claimed in claim 1, wherein to subtract each other program be that the amplitude of this group left detection signal of generation that this optical head detects and the amplitude of the right-hand detection signal of this group are subtracted each other to this prearranged signal, to produce this corresponding subtracted signal.
3. optics judgement system as claimed in claim 1, wherein this left detection module comprises:
One first detecting device is arranged at the left rear side of this optical head along this storage area, is used to detect along this received folded light beam of the left rear side of this storage area, and corresponding generation one first detection signal; And
One the 4th detecting device is arranged at the front left side of this optical head along this storage area, is used to detect along this received folded light beam of the front left side of this storage area, and corresponding generation 1 the 4th detection signal.
4. optics judgement system as claimed in claim 3, wherein this right-hand detection module comprises:
One second detecting device is arranged at the right lateral side of this optical head along this storage area, is used to detect along this received folded light beam of the right lateral side of this storage area, and corresponding generation one second detection signal; And
One the 3rd detecting device is arranged at the forward right side of this optical head along this storage area, is used to detect along this received folded light beam of the forward right side of this storage area, and corresponding generation 1 the 3rd detection signal.
5. optics judgement system as claimed in claim 4, wherein this signal subtraction program is that this of generation that this optical head detects first subtracted each other with the amplitude sum of the 3rd detection signal with the amplitude sum of the 4th detection signal and this second, to produce this corresponding subtracted signal.
6. optics judgement system as claimed in claim 4, wherein this signal subtraction program is that this of generation that this optical head detects second subtracted each other with the phase place sum of the 3rd detection signal with the phase place sum of the 4th detection signal and this first, to produce this corresponding subtracted signal.
7. optics judgement system as claimed in claim 6, wherein this second with the 4th detection signal be in-phase signal, and this first with the 3rd detection signal be in-phase signal, and this corresponding subtracted signal is a phase difference detection signal.
8. optics judgement system as claimed in claim 1, wherein this optics judgement system comprises in addition:
One high threshold values comparer is used for this bandpass filtered signal and a high threshold criteria signal of being scheduled to are compared, to obtain a high threshold values comparison signal; And
One low valve valve comparer is used for this bandpass filtered signal and a low valve valve reference signal of being scheduled to are compared, to obtain a low valve valve comparison signal;
Wherein according to this high threshold values comparison signal and this low valve valve comparison signal, the folded light beam that determines this optical head to detect is this projection storage track or this depression storage track that comes from this optic storage medium.
9. optics judgement system as claimed in claim 1, wherein this band pass filter means comprises:
One low-pass filter is used for HFS filtering in addition with this subtracted signal, to obtain a low-pass filter signal; And
One Hi-pass filter is used for low frequency part filtering in addition with this low-pass filter signal, to obtain this bandpass filtered signal.
10. optics judgement system as claimed in claim 9, wherein this low-pass filter signal is a kind of block signal, and this bandpass filtered signal is a kind of pulse signal.
11. optics method of discrimination, in order to differentiate the different storage track on the optic storage medium, include at least one protruding storage track and at least one depression storage track on this optic storage medium, each storage track all is divided into a central part and periphery position, both sides, and all include a data recorded area to write down a numerical data, and one the header record district to write down an address information, this numerical data comprises a plurality of position and is stored in the central part of this data recorded area along the direction of this storage track, this address information also comprises a plurality of position and is stored in the periphery position, both sides in this header record district along the direction of this storage track, in a protruding storage area and the address information in the header record district of a depression storage area, the sequencing at this periphery position, both sides that is stored in is also inequality, and this optics method of discrimination comprises the following step:
Provide an incident beam to this data recorded area and this header record district, and via this modulation of a plurality of, and produce a corresponding folded light beam;
Provide an optical head be arranged at this optic storage medium at a distance of a preset distance part, and be locked in the central part of this storage area substantially, detect this folded light beam with direction along this storage track, this optical head comprises:
One left detection module is arranged at the left side of this optical head along this storage track direction, is used to detect received folded light beam, and one group of left detection signal of corresponding generation; And
One right-hand detection module is arranged at the right side of this optical head along this storage track direction, is used to detect received folded light beam, and one group of right-hand detection signal of corresponding generation;
This group left detection signal of generation that this optical head detects and this are organized right-hand detection signal, subtract each other program through a prearranged signal, to produce a corresponding subtracted signal; And
With the high frequency and the low frequency part filtering in addition of this subtracted signal, be to come from this a projection storage track of this optic storage medium or a bandpass filtered signal of this depression storage track to obtain in order to the folded light beam that determines this optical head to be detected.
12. optics method of discrimination as claimed in claim 11, wherein to subtract each other program be that the amplitude of this group left detection signal of generation that this optical head detects and the amplitude of the right-hand detection signal of this group are subtracted each other to this prearranged signal, to produce this corresponding subtracted signal.
13. optics method of discrimination as claimed in claim 11, wherein this left detection module comprises:
One first detecting device is arranged at the left rear side of this optical head along this storage area, is used to detect along this received folded light beam of this storage area, and corresponding generation one first detection signal; And
One the 4th detecting device is arranged at the front left side of this optical head along this storage area, is used to detect along this received folded light beam of the front left side of this storage area, and corresponding generation 1 the 4th detection signal.
14. optics method of discrimination as claimed in claim 13, wherein this right-hand detection module comprises:
One second detecting device is arranged at the right lateral side of this optical head along this storage area, is used to detect along this received folded light beam of the right lateral side of this storage area, and corresponding generation one second detection signal; And
One the 3rd detecting device is arranged at the forward right side of this optical head along this storage area, is used to detect along this received folded light beam of the forward right side of this storage area, and corresponding generation 1 the 3rd detection signal.
15. optics method of discrimination as claimed in claim 14, wherein this signal subtraction program is that this of generation that this optical head detects first subtracted each other with the amplitude sum of the 3rd detection signal with the amplitude sum of the 4th detection signal and this second, to produce this corresponding subtracted signal.
16. optics method of discrimination as claimed in claim 14, wherein this signal subtraction program is that this of generation that this optical head detects second subtracted each other with the phase place sum of the 3rd detection signal with the phase place sum of the 4th detection signal and this first, to produce this corresponding subtracted signal.
17. optics method of discrimination as claimed in claim 16, wherein this second with the 4th detection signal be in-phase signal, and this first with the 3rd detection signal be in-phase signal, and this corresponding subtracted signal is a phase difference detection signal.
18. optics method of discrimination as claimed in claim 11, wherein this optics method of discrimination comprises the following step in addition:
This bandpass filtered signal and a high threshold criteria signal of being scheduled to are compared, to obtain a high threshold values comparison signal; And
This bandpass filtered signal and a low valve valve reference signal of being scheduled to are compared, to obtain a low valve valve comparison signal;
Wherein according to this high threshold values comparison signal and this low valve valve comparison signal, the folded light beam that determines this optical head to detect is this projection storage track or this depression storage track that comes from optic storage medium.
19. optics method of discrimination as claimed in claim 11, wherein this bandpass filtered signal is to be obtained by the following step:
With the HFS filtering in addition of this subtracted signal, to obtain a low-pass filter signal; And
With the low frequency part filtering in addition of this low-pass filter signal, to obtain this bandpass filtered signal.
20. optics method of discrimination as claimed in claim 19, wherein this low-pass filter signal is a kind of block signal, and this bandpass filtered signal is a kind of pulse signal.
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| CN 02145872 CN1244915C (en) | 2002-10-16 | 2002-10-16 | Testing system and method for distinguishing optical storage media recording district |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08249659A (en) * | 1995-03-13 | 1996-09-27 | Hitachi Electron Eng Co Ltd | Method for inspecting defect of optical disk |
| JPH0963086A (en) * | 1995-08-23 | 1997-03-07 | Matsushita Electric Ind Co Ltd | Track direction positioning device |
| CN1207549A (en) * | 1997-07-31 | 1999-02-10 | 汤姆森多媒体公司 | Tracking system for optical storage media |
| JP2002288855A (en) * | 2001-03-26 | 2002-10-04 | Matsushita Electric Ind Co Ltd | Optical disk device |
-
2002
- 2002-10-16 CN CN 02145872 patent/CN1244915C/en not_active Expired - Fee Related
- 2002-10-16 CN CNB2005101086301A patent/CN100371999C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08249659A (en) * | 1995-03-13 | 1996-09-27 | Hitachi Electron Eng Co Ltd | Method for inspecting defect of optical disk |
| JPH0963086A (en) * | 1995-08-23 | 1997-03-07 | Matsushita Electric Ind Co Ltd | Track direction positioning device |
| CN1207549A (en) * | 1997-07-31 | 1999-02-10 | 汤姆森多媒体公司 | Tracking system for optical storage media |
| JP2002288855A (en) * | 2001-03-26 | 2002-10-04 | Matsushita Electric Ind Co Ltd | Optical disk device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1783235A (en) | 2006-06-07 |
| CN1490794A (en) | 2004-04-21 |
| CN1244915C (en) | 2006-03-08 |
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