CN1312683C - Device and method for automatic adjustment of optical drive mirror signal - Google Patents
Device and method for automatic adjustment of optical drive mirror signal Download PDFInfo
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- CN1312683C CN1312683C CNB2004100084592A CN200410008459A CN1312683C CN 1312683 C CN1312683 C CN 1312683C CN B2004100084592 A CNB2004100084592 A CN B2004100084592A CN 200410008459 A CN200410008459 A CN 200410008459A CN 1312683 C CN1312683 C CN 1312683C
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Abstract
The invention discloses an automatic adjusting device and method for CD-ROM mirror signal, the device includes a pre-amplifier and a mirror signal adjuster, wherein the pre-amplifier is used to receive the signal output by the optical pick-up head to generate the mirror signal to the track-jump speed controller to control the track-jump action of the optical pick-up head, and the mirror signal adjuster is used to receive and judge the mirror signal to output the adjusting signal to the mirror signal generator as the basis for the mirror signal generation.
Description
Technical field
The present invention relates to a kind of CD-ROM drive mirror signal automatic regulating apparatus and method, particularly a kind of CD-ROM drive mirror signal automatic regulating apparatus and method.
Background technology
When reading discs, the CD-ROM drive optical read/write head must be jumped onto the tracks laser point light and follow the rail action between the different track of discs, just read discs.Yet because the discs track itself is not the relation of proper circle or its bearing machine tool, the optical read/write head of CD-ROM drive can't focus on its laser spot (focus on) on same track and depart from (can claim be run out).Therefore, CD-ROM drive can see through some testing mechanisms and detect these and departs from, and can jump onto the tracks, follow rail and locking normally in orbit to feedback the control optical read/write head.
Fig. 5 is known CDROM track-hopping, follow the synoptic diagram of rail framework.This framework includes optical read/write head 110, pre-amplifier 125, the controller 150 of jumping onto the tracks, follow rail controller 170 and driver 160 etc.With the action of jumping onto the tracks is example, when optical read/write head 110 is jumped onto the tracks when action, can provide some parameters to for example being direction and the rail number of direction detection-sluggishness protection-residue rail number controller 151 when determining to jump onto the tracks of jumping onto the tracks in the controller 150 of jumping onto the tracks by software.
Wherein, optical read/write head 110 can be corresponding its give pre-amplifier 125 to jump onto the tracks some signals 115 of output of action of discs; and pre-amplifier 125 promptly can produce tracking error signal 143 according to these signals 115; mirror signal 145 and tracking error zero-crossing signal 146 etc.; and tracking error signal 143 is output to following rail controller 170; mirror signal 145 and tracking error zero-crossing signal 146 are output to the direction detection-sluggishness protection-residue rail number controller 151 of jumping onto the tracks, and tracking error zero-crossing signal 146 also is output in the velocity calculator 175 to the controller 150 of jumping onto the tracks.
Therefore, the speed control 177 of jumping onto the tracks in the controller 150 of jumping onto the tracks can receive the signal 181 that is produced by rate curve generator 179 and get over the speed error signal 185 that rate signal 183 synthesize with velocity calculator 175 according to the friendship that tracking error zero-crossing signal 146 produces, and the back coupling of velocity error is controlled when jumping onto the tracks as optical read/write head 110.
Yet; sluggishness protection when the direction when optical read/write head 110 is jumped onto the tracks, residue rail number and slide rail then is that sluggishness is protected when being gone to judge the direction that optical read/write head 110 jumps onto the tracks, the residue rail number of jumping onto the tracks according to the mirror signal 145 and the phase place of tracking error zero-crossing signal 146 and being jumped onto the tracks slide rail according to the phase place of mirror signal (MIRR) 145 and tracking error zero-crossing signal 146 and then as optical read/write head 110 by the direction detections-sluggishness protection-residue rail number controller 151 of jumping onto the tracks, and corresponding output signal 153 is to jumping onto the tracks speed control 177.
At last, the speed control 177 of jumping onto the tracks can drive optical read/write heads 110 jump onto the tracks speed, the direction of action according to speed error signal and signal 153 Control Driver 160, and the sluggishness protection during slide rail.
As for purpose of the present invention, then be to propose at the mirror signal that pre-amplifier 125 is produced.Please refer to Fig. 1, Fig. 1 is the synoptic diagram that mirror signal produces.Please contrast Fig. 5 simultaneously, after prime amplifier 125 received signals 115, minute surface source signal generator 126, the minute surface cutting reference signal generator 127 that can see through in the pre-amplifier 125 produce minute surface source signal (MIRR source) 136 and minute surface cutting reference signal (MIRR slice level) 137 respectively, and minute surface source signal 136 and minute surface cutting reference signal 137 promptly form mirror signal 145 after comparer 128 is synthetic.
But,, all can influence the output of signal 115, i.e. the input of minute surface source signal generator 126, minute surface cutting reference signal generator 127 owing to the every discs self character or the relation of its bearing machine tool.Therefore, when the minute surface cutting reference signal 137 that the minute surface source signal 136 that minute surface source signal generator 126 is produced is produced by minute surface cutting reference signal generator 127 through comparer 128 is cut, the reference level that minute surface source signal 136 is cut is usually inaccurate, and cause the phase error of mirror signal 145, i.e. semiperiod and asymmetric up and down.
So, pre-amplifier 125 has no to feedback situation about controlling for mirror signal 145 under, optical read/write head 110 is when reading different discs, the minute surface source signal 136 that minute surface source signal generator 126 is produced is normal because of minute surface source signal 136 is cut the incorrect of reference level, and influences the output of mirror signal 145.And if jump onto the tracks direction detections-sluggishness protection-residue rail number controller 151 receive the mistake mirror signal 145 time; regular meeting causes optical read/write head 110 during jumping onto the tracks; the direction erroneous judgement; the rail number calculates wrong; or slide rail takes place during completing jumping; and the protection of the magnetic hysteresis during slide rail also can't stop slide rail, and promptly optical read/write head 110 can not stop shake.
Summary of the invention
In view of this, the purpose of this invention is to provide a kind of CD-ROM drive mirror signal automatic regulating apparatus and method, can effectively produce correct mirror signal, so that the optical read/write head of CD-ROM drive can cross correct track when discs being jumped onto the tracks action, and be unlikely to produce slide rail and related malfunction etc.
CD-ROM drive mirror signal automatic regulating apparatus of the present invention includes pre-amplifier and mirror signal adjuster.Wherein, pre-amplifier is given the speed control of jumping onto the tracks for the signal of exporting in order to the reception optical read head to produce mirror signal, with the action of jumping onto the tracks of control optical read head.The mirror signal adjuster then in order to reception and judgement mirror signal, is adjusted signal with output and is given the mirror signal generator, as the basis of mirror signal generation.
In preferred embodiment of the present invention, the mirror signal adjuster more includes detecting device and calibrating device.And wherein detecting device is in order to receive and to detect mirror signal, with output result signal.Calibrating device is the reception result signal then, adjusts signal with output.And detecting device can for example be low-pass filter or counter.
CD-ROM drive mirror signal automatic adjusting method of the present invention comprises: read mirror signal, if the semiperiod up and down of mirror signal is asymmetric, then adjust mirror signal, so that the symmetry of semiperiod up and down of mirror signal.Output at last is the mirror signal of semiperiod symmetry up and down, with the basis of carrying out as optical read head jumping onto the tracks and moving.
Because mirror signal is formed by minute surface source signal one cutting reference level is provided by minute surface cutting reference signal, therefore, in preferred embodiment of the present invention, the method more comprises: if this cutting reference level is number too high, and cause mirror signal semiperiod is asymmetric up and down the time, turn down this cutting reference level, so that the reference level that the minute surface source signal is cut is moderate.Otherwise,, then turn down this and cut reference level if this cutting reference level is low excessively.
Yet according to above-mentioned notion, the method also can comprise: if the cutting reference level is too high, also can heighten the waveform reference level of minute surface source signal, so that the reference level that the minute surface source signal is cut is moderate, on the contrary opposite.
In addition, if after adjusting this cutting reference level, the reference level that the minute surface source signal is cut is still higher and be the limit, then stops to adjust this cutting reference level, or after adjusting this cutting reference level one suitable number of times, promptly stops to adjust this cutting reference level.
Comprehensively above-mentioned, the present invention proposes a kind of CD-ROM drive mirror signal automatic regulating apparatus and method, utilize the mechanism of mirror signal back coupling control, can effectively produce correct mirror signal, so that the optical read/write head of CD-ROM drive can cross correct track when discs being jumped onto the tracks action, and be unlikely to produce slide rail and related malfunction etc.
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
Fig. 1 is the synoptic diagram of known CD-ROM drive mirror signal automatic regulating apparatus;
Fig. 2 is the synoptic diagram of the CD-ROM drive mirror signal automatic regulating apparatus of preferred embodiment of the present invention;
Fig. 3 A and Fig. 3 B are the waveform synoptic diagram of Fig. 1 pre-amplifier internal mirror source signal and its output tracking error signal and the mirror signal that pre-amplifier is exported and the waveform synoptic diagram of tracking error signal; And
Fig. 4 is the operation steps process flow diagram of Fig. 2 CD-ROM drive mirror signal automatic regulating apparatus 200 of preferred embodiment of the present invention; And
Fig. 5 is known CDROM track-hopping, follow the synoptic diagram of rail framework.
Description of reference numerals: 110,201 optical read/write heads; 115,153,181,203 signals; 125,210 pre-amplifiers; 126,215 minute surface source signal generators; 127,217 minute surfaces cutting reference signal generator; 128,219 comparers; 136,216 minute surface source signals; 137,218 minute surfaces cutting reference signal; 143 tracking error signals; 145,211 mirror signals; 146 tracking errors zero are handed over control signal more; 150,220 controllers of jumping onto the tracks; The 151 direction detection-sluggishness protection-residue rail number controllers of jumping onto the tracks; 160 drivers; 170 follow the rail controller; 175 velocity calculators; 177 speed controls of jumping onto the tracks; 179 rate curve generators; 185 speed error signals; 200 CD-ROM drive mirror signal automatic regulating apparatuses; 210 pre-amplifiers; 240,250 adjust signal; 260 detecting devices; 270 calibrating devices; 401～412 steps.
Embodiment
Fig. 2 is the synoptic diagram of the CD-ROM drive mirror signal automatic regulating apparatus of preferred embodiment of the present invention.In Fig. 2, CD-ROM drive mirror signal automatic regulating apparatus 200 includes pre-amplifier 210 and mirror signal adjuster 230 etc.Wherein, be mainly by mirror signal adjuster 230 and receive the mirror signal 211 that is produced by pre-amplifier 210, adjust signal as the usefulness of adjusting mirror signal 211 to feedback output one, and make that mirror signal 211 phase places are correct, be i.e. semiperiod symmetry up and down.
Fig. 3 A and Fig. 3 B are Fig. 1 pre-amplifier 125 internal mirror source signals 136 and the waveform synoptic diagram of its output tracking error signal 146 and mirror signal 145 that pre-amplifier 125 the is exported waveform synoptic diagram with tracking error signal 146.In Fig. 3 A, Fig. 1 minute surface source signal 136 is cutting reference signal 137 when comparer 128 compares with minute surface, and minute surface source signal 136 is equivalent to, as a, b, c and be cut through a direct current reference level.
And among Fig. 3 A minute surface source signal 136 via different reference level a, b, c cutting after, 145 of formed mirror signals are shown in Fig. 3 B.When the cutting reference level of minute surface source signal 136 such as a were too high, formed relatively 145 its first cycle of mirror signal time span t1 will be relatively less than second cycle time span t2.In like manner, if the cutting reference level of minute surface source signal 136 such as c cross when hanging down, formed relatively 145 its first cycle of mirror signal time span t3 will be relatively greater than second cycle time span t4.So, with the mirror signal 145 of a, c formation that reference level is cut and tracking error zero-crossing signal 146 jumping onto the tracks during action control as Fig. 1 optical read/write head 110, to not match because of mirror signal 145 phase place, and influence the action of jumping onto the tracks of optical read/write head 110 with tracking error zero-crossing signal 146.
As for when if the cutting reference level of minute surface source signal 136 such as b are correct, formed relatively 145 its first cycle of mirror signal time span t5 will equal second cycle time span t6.And cutting formed mirror signal 145 by the b reference level, minute surface source signal 136 is only correct mirror signal 145.So, with the mirror signal 145 of b formation that reference level is cut and tracking error zero-crossing signal 146 jumping onto the tracks during action control as optical read/write head 110, mirror signal 145 and tracking error signal 146 phase matching, and make the action of jumping onto the tracks of optical read/write head 110 correct.
Refer again to Fig. 2, under this framework of preferred embodiment of the present invention, can be at the too high or too low problem of above-mentioned cutting reference level, by the mirror signal adjuster 230 in the CD-ROM drive mirror signal automatic regulating apparatus 200, the mirror signal 211 that reception is produced by pre-amplifier 210 is to feedback output adjustment signal 240,250 as the back coupling control of adjusting mirror signal 211.
The method that CD-ROM drive mirror signal automatic regulating apparatus 200 is adjusted mirror signal 211 then is to read mirror signal 211 earlier, if the semiperiod up and down of mirror signal 211 is asymmetric, then adjusts mirror signal 211, so that the symmetry of semiperiod up and down of mirror signal 211.At last, the mirror signal 211 of the correct symmetry of semiperiod up and down can be input in the controller 220 of jumping onto the tracks, and carries out the basis of jumping onto the tracks and moving as 210 pairs of this optical read/write heads.
Wherein, the mirror signal 211 that pre-amplifier 210 is exported still receives the signal 203 that optical read/write heads 201 are exported by the minute surface source signal generator 215 of inside with minute surface cutting reference signal generator 217, with produce respectively minute surface source signal 215 and minute surface cutting reference signal 218 through comparer 219 relatively after and form.Therefore, the method that CD-ROM drive mirror signal automatic regulating apparatus 200 is adjusted mirror signal 211 also comprises: if when comparer 219 compares, it is too high or too low that minute surface is cut the reference level of base-level signal 218 cutting minute surface source signals 216, and cause mirror signal 211 semiperiod is asymmetric up and down the time, produce adjustment signal 250 respectively by mirror signal adjuster 230,240 to minute surface cutting reference signal generator 217 and minute surface source signal generator 215, to adjust some parameters of minute surface cutting reference signal generator 217 and minute surface source signal generator 215 inside, and then adjust to adjust the cutting reference level of the minute surface cutting reference signal 218 that minute surface cutting reference signal generator 217 and minute surface source signal generator 215 exported and the waveform reference level of minute surface source signal 216, so that minute surface cutting reference signal 218 provides the cutting reference level of minute surface source signal 216 moderate.
Therefore, adjust mirror signal 211 methods as can be known by above-mentioned CD-ROM drive mirror signal automatic regulating apparatus 200, mirror signal adjuster 230 in this CD-ROM drive mirror signal automatic regulating apparatus 200 can for example possess to be had in order to detecting the detecting device 260 of mirror signal semiperiod 211 about, and in order to judge mirror signal semiperiod symmetrical calibrating device 270 of also calibrating whether 211 about.And in preferred embodiment of the present invention, low-pass filter that detecting device 260 can for example be formed for resistance capacitance or digital counter, and this mirror signal 211 back outputs one consequential signal 280 is given calibrating device 270 after detecting.Wherein, low-pass filter can be a voltage signal with mirror signal 211 waveform rectifications, with reaction mirror signal semiperiod symmetry whether 211 about, and counter can be directly to mirror signal semiperiod counting 211 about, with counting with react mirror signal about in the of 211 the semiperiod whether symmetrical.And calibrating device 270 can and be exported respectively and adjust signal 240,250 to cutting reference signal generator 217 and minute surface source signal generator 215 according to consequential signal 280 corresponding controls.
The operating process of this CD-ROM drive mirror signal automatic regulating apparatus 200 can be with reference to figure 4, and Fig. 4 is the operation steps process flow diagram of Fig. 2 CD-ROM drive mirror signal automatic regulating apparatus 200 of preferred embodiment of the present invention.When prime amplifier 210 begins to produce mirror signal 211, promptly enter step 401.At this moment, the detecting device 260 in the mirror signal adjuster 230 promptly begins to read the mirror signal of being exported by when prime amplifier 210 211, and this is for to enter step 402 by step 401.
Then, this mirror signal 211 is via its time span of semiperiod up and down of the low-pass filter in the detecting device 260 260, counter 290 countings, and by calibrating device 270 by its semiperiod time span symmetry whether up and down of mirror signal 211, whether too high to judge that minute surface source signal 216 is cut reference level, this is for to enter step 403 by step 402.If it is too high that minute surface source signal 216 is cut reference level, then enter step 404 by step 403, controller 293 outputs are adjusted signal 250 to minute surface and are cut reference level generator 217 to turn down the cutting reference level that minute surface cutting reference signal 218 offers minute surface source signal 216.If it is not too high that minute surface source signal 216 is cut reference level, then step 403 enters step 405, judges by controller 293 whether minute surface source signal 216 is cut reference level low excessively.
When calibrating device 270 by after adjusting signal 250 and turning down minute surface cutting reference signal 240 and offer the cutting reference level of minute surface source signal 216, promptly enter step 406 by step 404, whether the time span of semiperiod of judging mirror signal again about in the of 211 symmetry, if symmetry then enter step 407 to stop whole flow process by step 406, if it is asymmetric, calibrating device 270 is exported and is adjusted signal 250 to pre-amplifier 125, to adjust the cutting reference level that minute surface cutting reference signal 240 offers minute surface source signal 216, and proceeding the following flow process of step 402 sees back, in step 405, if it is low excessively that minute surface source signal 216 is cut reference level, then enter step 409 by step 405, controller 293 outputs are adjusted signal 250 to minute surface and are cut reference level generator 217 to heighten the cutting reference level that minute surface cutting reference signal 218 offers minute surface source signal 216.Reference level is not too high then to enter step 407 to stop whole flow process by step 405 if minute surface source signal 216 is cut.
And when calibrating device 270 by after adjusting signal 250 and turning down minute surface cutting reference signal 240 and offer the cutting reference level of minute surface source signal 216, promptly enter step 411 by step 409, whether the time span of semiperiod of judging mirror signal again about in the of 211 symmetry, if symmetry then enter step 407 to stop whole flow process by step 406, if it is asymmetric, calibrating device 270 is exported and is adjusted signal 250 to pre-amplifier 125, offer the cutting reference level of minute surface source signal 216 to adjust minute surface cutting reference signal 240, and proceed the following flow process of step 402.
In addition, it is above-mentioned that the stopping of whole flow process also is not limited to, for instance, after the cycle index of flow process arrives an appropriate value, or when the cutting reference level of adjusting the minute surface cutting reference signal 240 minute surface source signal 216 that offers reaches the limit of, all can stop whole process step, to prevent that whole flow process from continuing and non-stop running and influence the action of CDROM track-hopping.
And by above-mentioned process step, CD-ROM drive mirror signal automatic regulating apparatus 200 removes can effectively adjust minute surface cutting reference signal 240, jump onto the tracks outside action uses for 201 pairs of discs 205 of optical read/write head to produce correct mirror signal 211, this CD-ROM drive mirror signal automatic regulating apparatus 200 also has the complete operating mechanism of a cover.
Comprehensively above-mentioned, the present invention proposes a kind of CD-ROM drive mirror signal automatic regulating apparatus and method, by detecting and judging the mechanism of adjustment, the mirror signal that reception is exported by pre-amplifier, adjust signal controlling minute surface cutting reference signal with back coupling output and offer the cutting reference level of minute surface source signal, and produce correct mirror signal.Therefore, the optical read/write head of CD-ROM drive can cross correct track when discs being jumped onto the tracks action, and avoids producing slide rail and related malfunction etc.
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, all should be considered as further enforcement of the present invention.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100084592A CN1312683C (en) | 2004-03-12 | 2004-03-12 | Device and method for automatic adjustment of optical drive mirror signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100084592A CN1312683C (en) | 2004-03-12 | 2004-03-12 | Device and method for automatic adjustment of optical drive mirror signal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1667722A CN1667722A (en) | 2005-09-14 |
| CN1312683C true CN1312683C (en) | 2007-04-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100084592A Expired - Fee Related CN1312683C (en) | 2004-03-12 | 2004-03-12 | Device and method for automatic adjustment of optical drive mirror signal |
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| CN (1) | CN1312683C (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08321050A (en) * | 1995-05-25 | 1996-12-03 | Matsushita Electric Ind Co Ltd | Offset correction method for tracking error signal |
| US5953305A (en) * | 1996-11-23 | 1999-09-14 | Lg Electronics Inc. | Method for detecting mirror signal and the same circuit |
| EP1237154A2 (en) * | 2001-03-02 | 2002-09-04 | Texas Instruments Incorporated | Mirror detection signal generator |
-
2004
- 2004-03-12 CN CNB2004100084592A patent/CN1312683C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08321050A (en) * | 1995-05-25 | 1996-12-03 | Matsushita Electric Ind Co Ltd | Offset correction method for tracking error signal |
| US5953305A (en) * | 1996-11-23 | 1999-09-14 | Lg Electronics Inc. | Method for detecting mirror signal and the same circuit |
| EP1237154A2 (en) * | 2001-03-02 | 2002-09-04 | Texas Instruments Incorporated | Mirror detection signal generator |
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| Publication number | Publication date |
|---|---|
| CN1667722A (en) | 2005-09-14 |
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Granted publication date: 20070425 Termination date: 20160312 |