CN1290100C - Method and apparatus for detecting disk track bias of CD driver - Google Patents
Method and apparatus for detecting disk track bias of CD driver Download PDFInfo
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- CN1290100C CN1290100C CN 200410008682 CN200410008682A CN1290100C CN 1290100 C CN1290100 C CN 1290100C CN 200410008682 CN200410008682 CN 200410008682 CN 200410008682 A CN200410008682 A CN 200410008682A CN 1290100 C CN1290100 C CN 1290100C
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Abstract
The present invention discloses a method and device for detecting disk track bias of an optical driver, wherein the amplitude electric potential of a central error signal or the frequency of a semi-track signal in a unit time mainly are used as the reference of the method and the device for detecting the disk. Compared with the known method using track error signals, the method can easily detect whether the disk is in a bias track or not, and semi-track signals have no noise trouble of the track error signals on a trigger source to avoid the erroneous judgment about whether the disk is in the bias track or not.
Description
Technical field
The present invention relates to a kind of detection track deflection of diskette method and device of CD-ROM drive, half rail signal frequency in the amplitude current potential of particularly a kind of use center rub-out signal (Center Error) or unit interval is as the detection track deflection of diskette method of CD-ROM drive and the foundation of device.
Background technology
In general, because the carrier or the track of discs own of carrying disc sheet do not belong to proper circle in the CD-ROM drive, so discs often can't be fixed on the center of circle.Also therefore, the read/write head of CD-ROM drive the situation (run out) of inclined to one side rail usually occurs easily when reading or writing discs, and the read/write head of CD-ROM drive can't read or write track correct on the discs.
When CD-ROM drive detects its discs of carrying and the situation of inclined to one side rail occurs, corresponding emergency measure is a speed (as 32 times) doubly during speed that CD-ROM drive will read discs is reduced to by high power speed (as 52 times), so that the minimizing of the situation of the inclined to one side rail of discs, and read/write head can read or write track correct on the discs.
But, known testing mechanism in the inclined to one side rail of CD ROM disc is utilize that read/write head returns one follows rail rub-out signal (Tracking Error) and judge.Please refer to Figure 1A and Figure 1B, Figure 1A and Figure 1B are the waveform synoptic diagram that known use follows the derailing of rail input disc.When being followed the rail rub-out signal with CD-ROM drive according to read/write head returned and detect discs and discs and do not have inclined to one side rail situation to take place, shown in Figure 1A, after this follows rail rub-out signal (signal of channel A) and amplifies in the bandpass filtering mode to follow its peak swing of rail rub-out signal (signal of channel C) be 0.73 volt.
And when discs has inclined to one side rail situation to take place, shown in Figure 1B, this follow rail rub-out signal (signal of channel A) after bandpass filter is amplified to follow its peak swing of rail rub-out signal (signal of channel C) be 0.82 volt.
So, detect discs whether partially during rail to follow the rail rub-out signal, what noise was more follows rail rub-out signal (especially when discs is got with the high power fast reading) after bandpass filter is amplified, its corresponding shown amplitude waveform otherness that goes out and little.Therefore, detect discs whether partially during rail, tend to cause erroneous judgement, can't really detect whether partially rail of discs to follow the rail rub-out signal.And can't detect discs whether partially during rail when CD-ROM drive, CD-ROM drive also can't reduce the speed that reads discs in good time, cause read/write head can't read or write correct path on the discs, finally, read/write head will be attempted reading or write correct path on the discs again with high power speed always, so that cause the CD-ROM system read-write efficiency to fall the end, even the doubt when machine is arranged.
In view of this, the present invention proposes a kind of detection track deflection of diskette method and device of CD-ROM drive, can effectively detect the situation of the inclined to one side rail of discs so that CD-ROM drive can and correctly read or write the discs that it was carried with the speed of the best.
Based on the passback of known use CD ROM reading-writing head follow the rail rub-out signal as this CD-ROM drive institute carrying disc sheet its whether partially during the detection signal of rail, at the inclined to one side rail of this discs or not partially under the situation of rail, all difference is little to follow the shown amplitude current potential that goes out of rail rub-out signal, causes CD-ROM drive can't read or write this discs.Therefore, the present invention considers to replace this to follow the rail rub-out signal with other signal, can under the situation of the inclined to one side rail of discs tangible amplitude current potential etc. be arranged to expect this other signal.
Summary of the invention
Fundamental purpose of the present invention provides a kind of detection track deflection of diskette method of CD-ROM drive, it is characterized in that using the center rub-out signal that is used for locating optical read/write head in the CD-ROM drive as the disc signal of rail whether partially that detects in the CD-ROM drive, when inclined to one side rail, this center rub-out signal is changeed signal frequently along with inclined to one side rail loads one, and makes the current potential of amplitude change.
In preferred embodiment of the present invention, said method comprises: according to the current potential of center rub-out signal amplitude and not partially the difference between the current potential of the center rub-out signal amplitude of rail judge disc inclined to one side rail whether in the CD-ROM drive.And in use whether partially heart rub-out signal as detecting disc in the CD-ROM drive before the signal of rail, earlier with bandpass filtering mode filtering center rub-out signal, again with the center rub-out signal as the disc signal of rail whether partially that detects in the CD-ROM drive.And the mode of bandpass filtering is the above bandpass filtering mode of second order.
Another fundamental purpose of the present invention provides a kind of detection track deflection of diskette method of CD-ROM drive, it is characterized in that: stride the rail number to judge whether partially rail of this disc according to read/write head in the unit interval on disc.
In preferred embodiment of the present invention, if in the unit interval read/write head on disc stride the rail number greater than a standard value time, disc in the CD-ROM drive is inclined to one side rail, if read/write head is striden the rail number when being less than or equal to standard value on disc in the unit interval, the disc in the CD-ROM drive is rail partially.Wherein, can CD-ROM drive in several limits on Spindle Motor time of calculating its running integer circle of Spindle Motor, and with time of its running integer circle of Spindle Motor as the above-mentioned unit interval.And utilize in the CD-ROM drive employed tracking error signal and radio frequency pulsation signalling mirror to penetrate and produce half rail signal, on disc, stride the rail number to judge read/write head.
The present invention goes back the detection track deflection of diskette device that a fundamental purpose provides a kind of CD-ROM drive, includes pre-amplifier, analog/digital converter and digital signal processor.Wherein pre-amplifier mainly receives signal that a read/write head exports to produce center error signal, tracking error signal and radio frequency fluctuating signal.Analog/digital converter mainly transfers center error signal, tracking error signal and radio frequency fluctuating signal to digital signal by simulating signal.Center error signal, tracking error signal and radio frequency fluctuating signal after the digital signal processor selectivity reception digitizing are with the foundation as track deflection of diskette.
Therefore, when the rub-out signal of digital signal processing device selective reception center, then detect the whether partially method of rail of disc with the center rub-out signal before the practice.And when digital signal processing device selective reception tracking error signal and radio frequency fluctuating signal, then practice preceding read/write head in the unit interval is striden the rail number to judge the whether partially method of rail of this disc on disc.
Comprehensively above-mentioned, the present invention proposes a kind of detection track deflection of diskette method and device of CD-ROM drive, can effectively detect the situation of the inclined to one side rail of discs so that CD-ROM drive can and correctly read or write the discs that it was carried with the speed of the best.
For the ease of further understanding feature of the present invention, purpose and function, the present invention is described in detail with instantiation below in conjunction with accompanying drawing.
Description of drawings
Figure 1A and Figure 1B are the waveform synoptic diagram that known use follows the derailing of rail input disc;
Fig. 2 is the synoptic diagram of the interior read/write head of CD-ROM drive and its carrier;
Fig. 3 is respectively center signal at the synoptic diagram of discs before and after changeing frequently;
Fig. 4 A and Fig. 4 B are respectively use center rub-out signal and detect the waveform synoptic diagram whether discs derails;
Fig. 5 is the synoptic diagram of Spindle Motor in the CD-ROM drive;
Fig. 6 is the synoptic diagram that tracking error signal and radio frequency pulsation form half rail signal;
Fig. 7 detects the signal graph of inclined to one side rail discs to stride the rail mode of counting;
Fig. 8 is the detection track deflection of diskette schematic representation of apparatus of the CD-ROM drive in the preferred embodiment of the present invention;
Fig. 9 is the operation steps process flow diagram of Fig. 8 digital signal processing device 830 inside; And
Figure 10 is the time diagram that detects inclined to one side rail discs with the center rub-out signal.
Description of reference numerals: 205 discs; 210 read/write heads; 220 carriers; 301,303 center rub-out signals; 302 sine waves; 500 Spindle Motors; 510 limits; 610 follow the rail rub-out signal; 620 radio frequency fluctuating signals; 630 half rail signals; 805 signals; 810 pre-amplifiers; 811 center signal generators; 813 radio frequencies pulsation signal generator; 815 follow rail rub-out signal generator; 816 center signals; 817 radio frequency fluctuating signals; 818 follow the rail rub-out signal; 820 analog/digital converters; 830 digital signal processing devices; 901～911 steps.
Embodiment
Fig. 2 is the synoptic diagram of the interior read/write head of CD-ROM drive and its carrier.In Fig. 2, in general, when discs 205 is in inclined to one side rail situation in the CD-ROM drive, the read/write head 210 in the CD-ROM drive and also can move along with the direction of the inclined to one side rail of discs together with the carrier 220 of carrying read/write head 210.Yet in order to control the center that read/write head 210 can be in carrier 220 at any time, CD-ROM drive can be controlled the relative position of read/write head 210 and carrier 220 according to a center rub-out signal.
Because this center rub-out signal, in the time of will be along with the inclined to one side rail of discs 205, the relative position of reaction read/write head 210 and carrier 220, therefore, it is one to react a signal of discs 205 inclined to one side rails that this center rub-out signal also can be used as.And particularly, when the inclined to one side rail of discs 205, this center rub-out signal more can load one along with discs 205 inclined to one side rails changes signal frequently, and makes this center rub-out signal when the inclined to one side rail of discs 205, and the current potential change of obvious amplitude is arranged.
Fig. 3 is respectively center signal at the synoptic diagram of discs before and after changeing frequently.In Fig. 3, center rub-out signal 301 is when discs is in inclined to one side rail, and can load a sine wave identical with the inclined to one side rail frequency of discs changes frequency signal 302 and form the center rub-out signal 303 that is loaded with commentaries on classics frequency signal 302.
Therefore, if by this center rub-out signal as discs whether partially during the detection signal of rail, it will have obvious difference on the otherness of amplitude current potential.Refer again to Fig. 4 A and Fig. 4 B, Fig. 4 A and Fig. 4 B are respectively use center rub-out signal and detect the waveform synoptic diagram whether discs derails.In Fig. 4 A, when using the center rub-out signal as detecting the discs whether partially signal of rail and discs partially during rail, the center rub-out signal of channel A with the bandpass filter on 2 rank (or more than 2 rank) after amplifying on certain frequency band, i.e. the signal of channel C, its peak swing is 0.69 volt.
And when use center rub-out signal as detecting discs whether partially when the signal of rail and the inclined to one side rail of discs, please refer to Fig. 4 B, the signal of the channel C after the center rub-out signal of channel A is amplified with bandpass filter, its peak swing is 1.12 volts.
So compare with known, follow the rail rub-out signal as detecting the inclined to one side rail of discs whether the time if adopt, representative not partially the rail rub-out signal amplitude current potential that follows that follows rail rub-out signal and the inclined to one side rail of representative of rail differ 0.09 volt.If adopt the center rub-out signal as detecting the inclined to one side rail of discs whether the time, representative not partially the center rub-out signal amplitude current potential of the center rub-out signal of rail and the inclined to one side rail of representative differ 0.43 volt, bigger difference is obviously arranged.
Whether partially in addition, the present invention also proposes a kind of when utilizing disc to change the integer circle, stride the rail number of striding of this discs of rail with CD ROM reading-writing head and judge this discs rail in CD-ROM drive.Its reason is, discs is when running integer circle, and read/write head is striden the rail number of striding of the inclined to one side rail discs of rail certainly will be greater than striding the rail number for inclined to one side rail discs.
In preferred embodiment of the present invention, be mainly and use the time that the limit on the Spindle Motor is calculated the whole number of turns of discs commentaries on classics in the CD-ROM drive, (Radio Frequency Ripple RFRP) forms half rail signal and counts rail to utilize in the CD-ROM drive pulsation of employed tracking error signal and radio frequency in addition.Please refer to Fig. 5, Fig. 5 is the synoptic diagram of Spindle Motor in the CD-ROM drive.In Fig. 5, can have for example individual limit 510 in 6 (or 18) on the Spindle Motor 500 in order to the rotating disc sheet in the CD-ROM drive, turn around and work as Spindle Motor 500 fortune, be that discs is transported when turning around, 6 limits 510 on the Spindle Motor 500 are all transported and are circled, the time in the time of therefore can learning discs running integer circle through 6 limits 510 on this Spindle Motor 500.
Fig. 6 is the synoptic diagram that tracking error signal and radio frequency pulsation form half rail signal.When the shape that originally promptly gets on the right track according to discs produce follow rail rub-out signal 610 and a radio frequency fluctuating signal 620 both trigger mutually with the triggering source and mirror after, to form a half cycles signal 630 that is equivalent to mirror discs track, only the orbital period of this half cycles signal 630 is that discs gets on the right track 1/2nd of the cycle.And the triggering source of following rail rub-out signal 610 and radio frequency fluctuating signal 620 by basis owing to this half rail signal 630 is produced, therefore, the triggering source of this half rail signal 630 does not have noise just like following on rail rub-out signal 610 and radio frequency fluctuating signal 620 its triggering sources.
Based on discs when the running integer circle, read/write head stride the inclined to one side rail discs of rail stride the rail number certainly will greater than not partially the rail discs stride the rail number, therefore the time in the time of can learning discs running integer circle by 6 limits 510 on Fig. 5 Spindle Motor 500, but and by half rail signal 630 of Fig. 6 mirror discs track, can be correct calculate that discs read/write head when running integer circle strides the inclined to one side rail discs of rail stride the rail number.
And when utilizing disc to change the integer circle, stride the rail number of striding of this discs of rail with CD ROM reading-writing head and judge the signal graph of rail discs partially, can be with reference to figure 7, Fig. 7 detects the signal graph of inclined to one side rail discs to stride the rail mode of counting.In Fig. 7, when getting an integer range with the discs of the channel A running number of turns, i.e. time span between the triggering source of channel D signal is during as a unit interval.In this unit interval the half rail signal of corresponding channel C, promptly channel B follows the rail rub-out signal and radio frequency pulsation signalling mirror is penetrated the signal that the back is produced, the number of times of its vibration will be obviously greater than its number of oscillation when discs is inclined to one side rail.
So, see through and use when half rail signal is as the inclined to one side rail of discs whether detection signal in center signal or unit interval, can effectively replace known to follow the rail rub-out signal as the inclined to one side rail of discs whether detection signal.
And above-mentioned to use center signal or half rail signal is as the method for the inclined to one side rail of discs whether detection signal in the unit interval, then can receive and use center signal or half rail signal reach by the digital signal processing device selectivity in the CD-ROM drive.
Fig. 8 is the detection track deflection of diskette schematic representation of apparatus of the CD-ROM drive in the preferred embodiment of the present invention.In Fig. 8, the detection track deflection of diskette device 800 of CD-ROM drive comprises pre-amplifier 810, analog/digital converter 820 and digital signal processing device 830.Wherein, pre-amplifier 810 receives the signal of being exported by CD ROM reading-writing head 805, with by center signal generator 811, the radio frequency pulsation signal generator 813 of its inside and follow rail rub-out signal generator 815 etc. and produce center signal 816, the radio frequency fluctuating signal 817 of simulation respectively and follow rail rub-out signal 818 etc.And center signal 816, the radio frequency fluctuating signal 817 of simulation and follow rail rub-out signal 818 and can be converted to digital signal by analog/digital converter 820.At last, specifically, digital signal processing device 830 is with selectivity receiving center signal 816, radio frequency fluctuating signal 817 and follow rail rub-out signal 818 with the detection signal as the inclined to one side rail of discs.
And the operation steps process flow diagram of digital signal processing device 830 inside please refer to Fig. 9, and Fig. 9 is the operation steps process flow diagram of Fig. 8 digital signal processing device 830 inside.In Fig. 9, partially whether during rail, this is a step 901 to the discs that begins to detect its carrying when CD-ROM drive.After, whether partially digital signal processing device can be selected as detecting the discs signal of rail, as the center rub-out signal, establish frequently fluctuating signal and follow rail rub-out signal etc., this is that step 901 is to step 902.
In order to select conduct to detect the whether partially signal of rail of discs, digital signal processing device can judge whether the signal that it received is the center rub-out signal earlier, and this is that step 902 is to step 903.If what digital signal processing device received is the center rub-out signal, then by step 903 to step 904, the digital signal processing device bandpass filter original state value that it is inner earlier makes zero, and prepares to use bandpass filter to amplify the center rub-out signal.Then, digital signal processing device promptly uses bandpass filter to amplify the center rub-out signal, and this is that step 904 is to step 905.
Then, digital signal processing device relatively amplifies the amplitude current potential of rear center's rub-out signal, and this is that step 905 is to step 906.If the amplitude current potential of center rub-out signal is greater than the standard value of the inclined to one side rail of discs, then digital signal processing device is exported the flag signals of the inclined to one side rail of discs; If the amplitude current potential of center rub-out signal is less than the standard value of the inclined to one side rail of discs, then digital signal processing device is not exported the flag signals of the inclined to one side rail of discs, and this is that step 906 is to step 907.After step 907 finished, whether partially digital signal processing device then finished the discs judgment mechanism of rail, and this is that step 907 is to step 908.
On the contrary, if digital signal processing device receives is not center rub-out signal but radio frequency fluctuating signal and when following the rail rub-out signal, then be that step 903 is to step 909, by digital signal processing device with the radio frequency fluctuating signal with follow the rail rub-out signal and trigger mutually, drive the half rail signal that read/write head is striden rail discs rail number and form generation mass color.Then, digital signal processing device is judged time of discs running integer circle according to the limit on the Spindle Motor in the CD-ROM drive, and with the unit interval as half rail signal time of this discs running integer circle, this is that step 909 is to step 910.Whether partially then, digital signal processing device is by half rail signal in the unit interval, judge rail number that read/write head in the unit interval strides the rail discs with decision discs rail, and this is that step 910 is to step 911.If the rail number that read/write head is striden the rail discs in the unit interval during greater than a standard value of the inclined to one side rail of CD-ROM drive, is then exported a flag signals of the inclined to one side rail of discs, otherwise then denied, this is that step 911 is to step 907.
In addition, step 904 is news figure during to the signal of step 907, can be with reference to Figure 10, and Figure 10 is the time diagram that detects inclined to one side rail discs with the center rub-out signal.In Figure 10, digital signal processing device after bandpass filter is amplified, during as if its amplitude current potential value of being above standard, then produces the command signal of an inclined to one side rail control and the flag signals of an inclined to one side rail in the center rub-out signal in regular turn.The then corresponding multiple that reads discs in order to the control read/write head of this command signal and flag signals.
The detection track deflection of diskette method of CD-ROM drive proposed by the invention and device will have the following advantages:
1, it is loaded with commentaries on classics signal frequently when the inclined to one side rail of discs owing to the center rub-out signal, its amplitude current potential will be than in discs obviously many during rail partially, therefore when the rub-out signal of use center as detecting discs whether during the detection signal of inclined to one side rail, follow the rail rub-out signal with known use and compare, can judge easilier by its amplitude potential change.
2, the rail number of striding of the read/write head when utilizing discs to change the integer circle judges that whether partially discs during rail, change the unit interval of integer circle as discs with the limit on the Spindle Motor in the CD-ROM drive, and stride the rail number with what follow that rail signal and radio frequency pulsation signalling mirror penetrates that formed half rail signal represents that read/write head strides the rail discs, therefore, by half rail signal in the unit interval as detecting discs whether partially during rail, except that can effectively judging discs whether partially the rail, and this half rail signal can't follow the rail rub-out signal as known, on its triggering source, have noise, and influence is to the judgement of the inclined to one side rail of discs.
Comprehensively above-mentioned, the present invention proposes a kind of detection track deflection of diskette method and device of CD-ROM drive, count the rail number by the amplitude current potential that uses the center rub-out signal or half rail signal representative in the unit interval and detect whether partially rail of discs, and following the rail rub-out signal with known use compares, whether partially the present invention will be easier judge discs rail, and half rail signal does not have and follows the rail rub-out signal have noise on its triggering source.Therefore, the present invention can provide a kind of more known better and inclined to one side rail testing mechanism of discs that accuracy is higher really.
The above only is preferred embodiment of the present invention, can not limit the scope of the invention with this.All equalizations of doing according to claim of the present invention change and modify, will not lose main idea of the present invention place, also do not break away from the spirit and scope of the present invention, and the former capital should be considered as further enforcement of the present invention.
Claims (5)
1. the detection track deflection of diskette method of a CD-ROM drive comprises:
Whether partially use the center rub-out signal that is used for locating an optical read/write head in this CD-ROM drive as this disc signal of rail that detects in this CD-ROM drive, when inclined to one side rail, this center rub-out signal changes along with inclined to one side rail takes place one; And
Judge this disc rail whether partially in this CD-ROM drive according to the change of this center rub-out signal.
2. whether partially the detection track deflection of diskette method of CD-ROM drive as claimed in claim 1 wherein also comprises: judge this disc rail in this CD-ROM drive according to the current potential of this center rub-out signal amplitude.
3. the detection track deflection of diskette method of CD-ROM drive as claimed in claim 1, wherein also comprise: using this center rub-out signal as detecting this disc in this CD-ROM drive whether partially before the signal of rail, adopt earlier the bandpass filtering mode to center rub-out signal filtering, then with this center rub-out signal as this disc signal of rail whether partially that detects in this CD-ROM drive.
4. the detection track deflection of diskette method of CD-ROM drive as claimed in claim 3, wherein this bandpass filtering mode is the above bandpass filtering mode of second order.
5. the detection track deflection of diskette device of a CD-ROM drive comprises:
One pre-amplifier receives a signal that a read/write head exports to produce a center error signal, a tracking error signal and a radio frequency fluctuating signal;
One analog/digital converter transfers this center error signal, this tracking error signal and this radio frequency fluctuating signal to digital signal by simulating signal; And
One digital signal processor, this center error signal, this tracking error signal and this radio frequency fluctuating signal after the selectivity reception digitizing are with the foundation as this track deflection of diskette.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410008682 CN1290100C (en) | 2004-03-18 | 2004-03-18 | Method and apparatus for detecting disk track bias of CD driver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410008682 CN1290100C (en) | 2004-03-18 | 2004-03-18 | Method and apparatus for detecting disk track bias of CD driver |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200610099303 Division CN1873790A (en) | 2004-03-18 | 2004-03-18 | Method and device for detecting track deflection of diskette of optical drive |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1670846A CN1670846A (en) | 2005-09-21 |
| CN1290100C true CN1290100C (en) | 2006-12-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200410008682 Expired - Fee Related CN1290100C (en) | 2004-03-18 | 2004-03-18 | Method and apparatus for detecting disk track bias of CD driver |
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| CN (1) | CN1290100C (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4791335B2 (en) * | 2006-12-15 | 2011-10-12 | 株式会社日立製作所 | Tracking error detection method and optical disk reproducing apparatus using the same |
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Granted publication date: 20061213 Termination date: 20160318 |