CN101436417B - Method for distinguishing eccentric CD - Google Patents
Method for distinguishing eccentric CD Download PDFInfo
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- CN101436417B CN101436417B CN2007101871207A CN200710187120A CN101436417B CN 101436417 B CN101436417 B CN 101436417B CN 2007101871207 A CN2007101871207 A CN 2007101871207A CN 200710187120 A CN200710187120 A CN 200710187120A CN 101436417 B CN101436417 B CN 101436417B
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- eccentric
- discs
- signal
- distinguishing
- focusing
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Abstract
The invention provides a method for identifying an eccentric optical disk sheet, which comprises: generating a focus on an optical disk sheet; driving the optical disk sheet to rotate; generating a track spanning signal through a track of the optical disk sheet spanning the focus; and judging that the optical disk sheet is the eccentric optical disk sheet when the frequency of the track spanning signal is smaller than a preset value. The method for identifying the eccentric optical disk sheet can accurately judge whether an optical disk sheet is an eccentric optical disk sheet or not, so as to perform special treatment on the eccentric optical disk sheet to avoid unreadable error when the eccentric optical disk sheet is read.
Description
Technical field
The present invention is relevant to a kind of method of judging eccentric CD, refers to a kind of method that is used for the judgement eccentric CD of CD player especially.
Background technology
In the processing procedure of discs, data can be stored in the concentrically ringed track, are writing fashionablely, and data can write discs in regular turn along concentrically ringed track, and data also can read in regular turn from concentrically ringed track when reading.
Being drafted according to the specification of discs of general track, for example for CD, the pitch under the normal condition is 1.6 μ m, for DVD, is 0.74 μ m under the normal condition.
When the CD processing procedure, at the central part of discs, the main shaft at Spindle Motor center is because the reason of installing can utilize machinery to wear center pit at the discs center.In theory, the track concentric circles center of discs identifying recording layer should be identical with above-mentioned center pit, and departure between the two should be 0.
Yet in fact, general optical disk is as material, then with in addition moulding of mould with polycarbonate.In the process of moulding, may be because the formation of various errors, cause producing between the track concentric circles center of the center pit of discs and discs identifying recording layer the error offset of 10 μ m to 100 μ m, this offset excessive if (being commonly referred to as eccentric CD), then can cause reading device can't follow rail, cause the CD player can't normal operation, data be had no idea by correct reading.
Therefore how to judge when reading discs whether this discs is that eccentric CD is real in needing the problem of solution at present badly.
Summary of the invention
Therefore, one of purpose of the present invention is to provide a kind of method for distinguishing eccentric CD, and this method comprises: produce one and focus on a discs; Drive this discs, make this discs begin rotation; Cross this focusing according to a track of this discs and produce a seeking signal; And the frequency of working as this seeking signal judges promptly that less than a predetermined value this discs is this eccentric CD.
Method for distinguishing eccentric CD of the present invention, this method more comprises: after this discs begins rotation, when this track is crossed this focusing, this focus reflection one digital signal, this digital signal comprises this seeking signal.
Method for distinguishing eccentric CD of the present invention, this method more comprises: provide a signal receiving device to receive this seeking signal.
Method for distinguishing eccentric CD of the present invention, this seeking signal are a RP (Rapid Prototyping) digital signal.
Method for distinguishing eccentric CD of the present invention, this predetermined value are 15kHz.
Method for distinguishing eccentric CD of the present invention, this seeking signal are to produce according to the number of times that this track of this discs is crossed this focusing.
Method for distinguishing eccentric CD of the present invention, this discs begin postrotational rotating speed for fixing.
Method for distinguishing eccentric CD of the present invention, the position that this focusing produces is arranged in a data recording scope of this CD.
Method for distinguishing eccentric CD of the present invention, the position of this focusing is maintained fixed.
The present invention provides a kind of method for distinguishing eccentric CD in addition, and this method comprises: drive a discs, make this discs begin rotation; On discs, produce one and focus on, and receive a reflected signal of this focusing; According to this reflected signal, a track of finding out this discs is crossed the frequency of this focusing; And work as this frequency and judge promptly that less than a predetermined value this discs is this eccentric CD.
Method for distinguishing eccentric CD of the present invention comprises a seeking signal in this reflected signal, this seeking signal is crossed this focusing according to this track and formed.
Method for distinguishing eccentric CD of the present invention, this seeking signal are to produce according to the number of times that this track of this discs is crossed this focusing.
Method for distinguishing eccentric CD of the present invention, this method more comprises: provide a signal receiving device to receive this reflected signal.
Method for distinguishing eccentric CD of the present invention, this reflected signal are a RP (Rapid Prototyping) digital signal.
Method for distinguishing eccentric CD of the present invention, this predetermined value are 15kHz.
Method for distinguishing eccentric CD of the present invention, this discs begin postrotational rotating speed for fixing.
Method for distinguishing eccentric CD of the present invention, the position that this focusing produces is arranged in a data recording scope of this CD.
Method for distinguishing eccentric CD of the present invention, the position of this focusing is maintained fixed.
Method for distinguishing eccentric CD of the present invention, whether be eccentric CD, so that handle especially at eccentric CD, avoid eccentric CD to produce the mistake that can't read when CD reads if can accurately judge CD.
Description of drawings
Fig. 1 is the structure drawing of device of the judgement eccentric CD method of preferred embodiment of the present invention;
Fig. 2 is the seeking signal oscillogram of preferred embodiment of the present invention;
Fig. 3 shows the judgement eccentric CD method flow diagram of preferred embodiment of the present invention.
Embodiment
See also Fig. 1, Fig. 1 is the structure drawing of device of the judgement eccentric CD method of preferred embodiment of the present invention, as shown in Figure 1, judges that the device of eccentric CD method comprises Spindle Motor 11, focuses on generation device 13 and signal receiving device 16.
Spindle Motor 11 comprises a central shaft 111, rotates to drive discs 12 in order to the center pit 121 that inserts discs 12.When Spindle Motor 11 drives discs 12 rotations, focus on generation device 13 and can on discs 12, produce a focusing 14, focus on 14 and be positioned at discs 12 identifying recording layer scopes, in order to reading the data on the track, and reflect a reflected signal 15 to signal receiving device 16.Reflected signal 15 is generally RP (Rapid Prototyping) digital signal, comprising the data of record on the discs 12 that is read, and crosses when focusing on 14 when track, and reflected signal 15 can comprise that simultaneously track crosses the seeking signal of focusing 14.
When discs 12 is eccentric CD, mean that the center pit 121 of discs and the track concentric circles center of discs 12 identifying recording layers have deviation, therefore when discs 12 rotations, the track of discs 12 identifying recording layers can be oval rotation, because the focusing 14 that is formed on the discs 12 remains on the fixing position, therefore track is when discs 12 rotations, can constantly cross and focus on 14, and reflected signal 15 just can stride across track and focuses on 14 number of times and reflect to signal receiving device with the form of digital signal and receive.
Please refer to Fig. 2, Fig. 2 is the seeking signal oscillogram of preferred embodiment of the present invention, and as shown in Figure 2, the track crossings of the frequency representation discs 12 of seeking signal 21 is crossed and focused on 14 frequency, the frequency of crossing focusing 14 when track is high more, then waveform is intensive more, otherwise the frequency of crossing focusing 14 when track is low more, then waveform is loose more, therefore can be from the waveform closeness of seeking signal 21, judge that track crosses the frequency of discs 12, push away to such an extent that whether this discs 12 belongs to eccentric CD indirectly.
Experimental result, the frequency of the seeking signal 21 of general discs are between 15kHz-30kHz, and the frequency of the seeking signal 21 of eccentric CD surpasses 30kHz even reaches 50kHz.
Therefore when needs judge that a slice discs is general optical disk or eccentric CD, get certain frequency range in the present embodiment, and the number of times between the certain frequency scope appears in observation seeking signal 21 within a certain period of time, because the seeking signal 21 of actual conditions is not the stable signal of one-period, therefore only calculate the number of times of seeking signal 21 between certain limit, when this number of times less than certain value, judge that then discs is an eccentric CD.Because the seeking signal of eccentric CD often causes the frequency of seeking signal 21 to improve because stride rail often, thereby when the certain frequency scope is limited in the mean value of high and low frequency, the number of times that the high frequency that eccentric CD is easier to occur appears in the certain frequency scope just can reduce, therefore as long as number of times is less than certain value and judges that just discs is an eccentric CD.
In the present embodiment, per 8.3 microseconds (microsecond) that are produced as of seeking signal 21 measure once, making seeking signal oscillogram as shown in Figure 2, but not as limit.
Please refer to Fig. 3, it shows the judgement eccentric CD method flow diagram of preferred embodiment of the present invention, as shown in Figure 3, at first drive discs 12 (S1) with Spindle Motor 11, make discs 21 begin rotation, then produce in the record data scope on discs and focus on 14 (S2), in the process of discs 12 rotations, because the position of focusing 14 is maintained fixed, the track of record data can be crossed and focus on 14, and the generation seeking signal, signal receiving device 16 can be used for receiving seeking signal (S3), and seeking signal is analyzed (S4), see seeking signal between the number of times of certain limit within a certain period of time whether less than a predetermined value (S5), if the result who analyzes, the frequency of seeking signal surpasses less than a predetermined value between the number of times of certain limit, judges that then this discs 12 is eccentric CD (S51), if greater than a predetermined value, judge that then discs 12 is general discs (S52), to finish the process of judging eccentric CD.
As mentioned above, whether the present invention can accurately judge CD is eccentric CD, so that handle especially at eccentric CD, avoids eccentric CD to produce the mistake that can't read when CD reads, and has the value on the industry.
The above only is preferred embodiment of the present invention; so it is not in order to limit scope of the present invention; any personnel that are familiar with this technology; without departing from the spirit and scope of the present invention; can do further improvement and variation on this basis, so the scope that claims were defined that protection scope of the present invention is worked as with the application is as the criterion.
Being simply described as follows of symbol in the accompanying drawing:
11: Spindle Motor
111: central shaft
12: disc
121: center pit
13: focus on generation device
14: focus on
15: reflected signal
16: signal receiving device
21: seeking signal
S1-S52: method flow.
Claims (12)
1. a method for distinguishing eccentric CD is characterized in that, this method comprises:
Produce one and focus on a discs, the position of this focusing is maintained fixed;
Drive this discs, make this discs begin rotation;
Cross this focusing according to a track of this discs and produce a seeking signal; And
When the number of times of frequency in a preset range of this seeking signal judges promptly that less than a predetermined value this discs is this eccentric CD within a certain period of time.
2. method for distinguishing eccentric CD according to claim 1 is characterized in that, this method more comprises: after this discs begins rotation, and when this track is crossed this focusing, this focus reflection one digital signal, this digital signal comprises this seeking signal.
3. method for distinguishing eccentric CD according to claim 1 is characterized in that, this method more comprises: provide a signal receiving device to receive this seeking signal.
4. method for distinguishing eccentric CD according to claim 1 is characterized in that, this seeking signal is a RP digital signal.
5. method for distinguishing eccentric CD according to claim 1 is characterized in that, this seeking signal is to produce according to the number of times that this track of this discs is crossed this focusing.
6. method for distinguishing eccentric CD according to claim 1 is characterized in that, the position that this focusing produces is arranged in a data recording scope of this CD.
7. a method for distinguishing eccentric CD is characterized in that, this method comprises:
Drive a discs, make this discs begin rotation;
Produce one and focus on discs, and receive a reflected signal of this focusing, wherein, the position of this focusing is maintained fixed;
According to this reflected signal, a track of finding out this discs is crossed the frequency of this focusing; And
When the number of times of this frequency in a preset range judges promptly that less than a predetermined value this discs is this eccentric CD within a certain period of time.
8. method for distinguishing eccentric CD according to claim 7 is characterized in that, comprises a seeking signal in this reflected signal, and this seeking signal is crossed this focusing according to this track and formed.
9. method for distinguishing eccentric CD according to claim 8 is characterized in that, this seeking signal is to produce according to the number of times that this track of this discs is crossed this focusing.
10. method for distinguishing eccentric CD according to claim 7 is characterized in that, this method more comprises: provide a signal receiving device to receive this reflected signal.
11. method for distinguishing eccentric CD according to claim 7 is characterized in that, this reflected signal is a RP digital signal.
12. method for distinguishing eccentric CD according to claim 7 is characterized in that, the position that this focusing produces is arranged in a data recording scope of this CD.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101871207A CN101436417B (en) | 2007-11-16 | 2007-11-16 | Method for distinguishing eccentric CD |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101871207A CN101436417B (en) | 2007-11-16 | 2007-11-16 | Method for distinguishing eccentric CD |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101436417A CN101436417A (en) | 2009-05-20 |
| CN101436417B true CN101436417B (en) | 2011-04-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007101871207A Expired - Fee Related CN101436417B (en) | 2007-11-16 | 2007-11-16 | Method for distinguishing eccentric CD |
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| CN (1) | CN101436417B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1542780A (en) * | 2003-04-28 | 2004-11-03 | ���µ�����ҵ��ʽ���� | Information carrier apparatus and information carrier eccentricity correction method |
| CN1873790A (en) * | 2004-03-18 | 2006-12-06 | 联发科技股份有限公司 | Method and device for detecting track deflection of diskette of optical drive |
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2007
- 2007-11-16 CN CN2007101871207A patent/CN101436417B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1542780A (en) * | 2003-04-28 | 2004-11-03 | ���µ�����ҵ��ʽ���� | Information carrier apparatus and information carrier eccentricity correction method |
| CN1873790A (en) * | 2004-03-18 | 2006-12-06 | 联发科技股份有限公司 | Method and device for detecting track deflection of diskette of optical drive |
Non-Patent Citations (1)
| Title |
|---|
| JP昭57-55542A 1982.04.02 |
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| Publication number | Publication date |
|---|---|
| CN101436417A (en) | 2009-05-20 |
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Granted publication date: 20110413 Termination date: 20131116 |