CN1667722A - Device and method for automatic adjustment of optical drive mirror signal - Google Patents

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

Device and method for automatic adjustment of optical drive mirror signal

technical field

The invention relates to an optical drive mirror signal automatic adjustment device and method, in particular to an optical drive mirror signal automatic adjustment device and method.

Background technique

When reading an optical disc, the optical read/write head of the optical drive must jump and track the laser spot between different tracks of the optical disc to read the optical disc. However, since the optical disc track itself is not a true circle or its bearing mechanism, the optical head of the optical drive cannot focus its laser spot on the same track and deviate (it can be called run out). Therefore, the optical drive can detect these deviations through some detection mechanisms, and use feedback to control the optical head to jump, track and lock on the track normally.

FIG. 5 is a schematic diagram of a conventional track-jumping and track-following architecture. This architecture includes an optical read/write head 110 , a preamplifier 125 , a track jump controller 150 , a track controller 170 , and a driver 160 . Taking the track jumping action as an example, when the optical read-write head 110 performs the track jumping action, some parameters can be provided by software to, for example, the track jumping direction detection-hysteresis protection-remaining track number controller 151 in the track jumping controller 150 To determine the direction and number of tracks when jumping tracks.

Wherein, the optical read-write head 110 will output some signals 115 to the pre-amplifier 125 corresponding to its track-jumping action on the optical disc, and the pre-amplifier 125 will generate a tracking error signal 143, a mirror signal 145 and Tracking error zero-crossing signal 146, etc., and tracking error signal 143 is output to tracking controller 170, mirror signal 145 and tracking error zero-crossing signal 146 are output to track jump direction detection-hysteresis protection-remaining track The tracking error zero-crossing signal 146 is also output to the speed calculator 175 in the track jump controller 150 .

Therefore, the track jump speed controller 177 in the track jump controller 150 can receive the signal 181 generated by the speed curve generator 179 and the cross speed signal 183 generated by the speed calculator 175 according to the tracking error zero crossing signal 146. The synthesized speed error signal 185 is used as a feedback control of the speed error when the optical pick-up head 110 jumps tracks.

However, the direction when the optical head 110 jumps tracks, the number of remaining tracks, and the hysteresis protection when it slides are determined by the track jumping direction detection-hysteresis protection-remaining track number controller 151 according to the mirror signal 145 and the tracking error zero crossing. The phase of the crossing signal 146 is used to judge the direction of the optical pick-up head 110 track jump, the number of remaining tracks of the track jump, and the phase of the mirror signal (MIRR) 145 and the tracking error zero-crossing signal 146 as the optical pick-up head 110 jumps. Hysteresis protection when the rail slides, and the corresponding output signal 153 is given to the rail jumping speed controller 177.

Finally, the track jumping speed controller 177 can control the speed and direction of the track jumping action of the driver 160 to drive the optical pickup 110 according to the speed error signal and the signal 153 , and hysteresis protection when sliding the track.

As for the purpose of the present invention, it is proposed for the mirror signal generated by the pre-amplifier 125 . Please refer to FIG. 1 , which is a schematic diagram of mirror signal generation. Please refer to Fig. 5 at the same time, after the pre-amplifier 125 receives the signal 115, the mirror source signal generator 126 and the mirror cutting reference signal generator 127 in the pre-amplifier 125 can respectively produce a mirror source signal (MIRR source) 136 and a mirror The MIRR slice level 137, the mirror source signal 136 and the mirror cutting reference signal 137 are synthesized by the comparator 128 to form the mirror signal 145.

However, due to the characteristics of each optical disc or the relationship between its carrying equipment, it will affect the output of the signal 115 , that is, the input of the mirror source signal generator 126 and the mirror cutting reference signal generator 127 . Therefore, when the mirror source signal 136 produced by the mirror source signal generator 126 is cut by the mirror cut reference signal 137 generated by the mirror cut reference signal generator 127 through the comparator 128, the cut reference level of the mirror source signal 136 is often Inaccurate, resulting in a phase error of the mirror signal 145, that is, the upper and lower half periods are not symmetrical.

Therefore, when the pre-amplifier 125 has no feedback control on the mirror signal 145, when the optical pickup 110 reads different optical discs, the mirror source signal 136 generated by the mirror source signal generator 126 is often caused by the mirror signal. The source signal 136 is clipped to an incorrect reference level, which affects the output of the mirror signal 145 . And if track jump direction detection-hysteresis protection-remaining track number controller 151 receives wrong mirror signal 145, it will often cause the optical read-write head 110 to misjudge the direction during the track jump period, track number calculation is wrong, or the track jump ends When the sliding rail occurs, the hysteresis protection of the sliding rail cannot stop the sliding rail, that is, the optical read-write head 110 will vibrate continuously.

Contents of the invention

In view of this, the object of the present invention is to provide an optical drive mirror signal automatic adjustment device and method, which can effectively generate the correct mirror signal, so that the optical read-write head of the optical drive can jump to the correct position when performing a track jump action on the optical disc. The track, so as not to produce slide rails and joint wrong actions.

The optical drive mirror signal automatic adjustment device of the present invention includes a preamplifier and a mirror signal adjuster. Wherein, the preamplifier is used to receive the signal output by the optical pickup head to generate a mirror signal to the track jump speed controller, so as to control the track jump action of the optical pickup head. The mirror signal adjuster is used to receive and judge the mirror signal, and output the adjustment signal to the mirror signal generator as the basis for generating the mirror signal.

In a preferred embodiment of the present invention, the mirror signal adjuster further includes a detector and a calibrator. And the detector is used to receive and detect the mirror signal to output the resulting signal. The calibrator then receives the resulting signal to output an adjustment signal. Instead the detector can be, for example, a low-pass filter or a counter.

The optical drive mirror signal automatic adjustment method of the present invention includes: reading the mirror signal, if the upper and lower half periods of the mirror signal are asymmetrical, then adjusting the mirror signal so that the upper and lower half periods of the mirror signal are symmetrical. Finally, the symmetrical mirror signals of the upper and lower half cycles are output as the basis for the optical pickup head to perform a track jumping action.

Since the mirror signal is formed by providing the mirror source signal-cutting reference level by the mirror cutting reference signal, in a preferred embodiment of the present invention, the method further includes: if the cutting reference level is too high, causing the mirror When the upper and lower half periods of the signal are asymmetrical, lower the cutting reference level to make the reference level of the mirror source signal cut moderate. Conversely, if the cutting reference level is too low, lower the cutting reference level.

However, according to the above concept, the method may also include: if the cutting reference level is too high, the waveform reference level of the mirror source signal may also be increased so that the reference level of the mirror source signal being cut is moderate, and vice versa.

In addition, if after adjusting the cutting reference level, the reference level of the mirror source signal being cut is still high and at the limit, stop adjusting the cutting reference level, or stop after adjusting the cutting reference level for an appropriate number of times. Adjust this cut reference level.

Based on the above, the present invention proposes an optical drive mirror signal automatic adjustment device and method, which can effectively generate the correct mirror signal by using the mirror signal feedback control mechanism, so that the optical read-write head of the optical drive performs track jumping action on the optical disc It can cross over to the correct track in time, without causing slide rails and associated wrong actions.

In order to facilitate a further understanding of the features, purposes and functions of the present invention, the present invention will be described in detail below with specific examples in conjunction with the accompanying drawings.

Description of drawings

FIG. 1 is a schematic diagram of a conventional optical drive mirror signal automatic adjustment device;

Fig. 2 is a schematic diagram of an optical drive mirror signal automatic adjustment device in a preferred embodiment of the present invention;

3A and FIG. 3B are schematic waveform diagrams of the internal mirror source signal of the preamplifier of FIG. 1 and its output tracking error signal, and waveform schematic diagrams of the mirror signal and the tracking error signal output by the preamplifier; and

FIG. 4 is a flow chart of the operation steps of the optical drive mirror signal automatic adjustment device 200 of FIG. 2 in a preferred embodiment of the present invention; and

FIG. 5 is a schematic diagram of a conventional track-jumping and track-following architecture.

Explanation of reference signs: 110, 201 optical read-write head; 115, 153, 181, 203 signal; 125, 210 pre-amplifier; 126, 215 mirror source signal generator; 127, 217 mirror cutting reference signal generator; 128, 219 comparator; 136, 216 mirror source signal; 137, 218 mirror cutting reference signal; 143 tracking error signal; 145, 211 mirror signal; 146 tracking error zero crossing control signal; Track jump direction detection - hysteresis protection - remaining track number controller; 160 drive; 170 track controller; 175 speed calculator; 177 track jump speed controller; 179 speed curve generator; 185 speed error signal; 200 optical drive mirror signal Automatic adjustment device; 210 pre-amplifier; 240, 250 adjustment signal; 260 detector; 270 calibrator; 401-412 steps.

Detailed ways

FIG. 2 is a schematic diagram of an automatic adjustment device for mirror signal of an optical drive according to a preferred embodiment of the present invention. In FIG. 2 , the optical drive mirror signal automatic adjustment device 200 includes a preamplifier 210 , a mirror signal adjuster 230 and so on. Among them, the mirror signal adjuster 230 mainly receives the mirror signal 211 generated by the preamplifier 210, and outputs an adjustment signal as a feedback to adjust the mirror signal 211, so that the phase of the mirror signal 211 is correct, that is, the upper and lower half Cyclic symmetry.

3A and 3B are schematic waveform diagrams of the mirror source signal 136 and the tracking error signal 146 output from the preamplifier 125 in FIG. In FIG. 3A , when the mirror source signal 136 in FIG. 1 is compared with the mirror cut reference signal 137 by the comparator 128 , the mirror source signal 136 is equivalent to a DC reference level, such as a, b, c, and is cut.

In FIG. 3A , after the mirror source signal 136 is cut by different reference levels a, b, c, the formed mirror signal 145 is as shown in FIG. 3B . When the cutting reference level such as a of the mirror source signal 136 is too high, the time length t1 of the first half cycle of the formed mirror signal 145 will be relatively shorter than the time length t2 of the second half cycle. Similarly, if the cutting reference level c of the mirror source signal 136 is too low, the time length t3 of the first half cycle of the formed mirror signal 145 will be relatively longer than the time length t4 of the second half cycle. Therefore, when the mirror signal 145 and the tracking error zero-crossing signal 146 formed by cutting the a and c reference levels are used as the track jump action control of the optical pick-up 110 in FIG. The phase mismatch of the crossover signal 146 affects the track jumping action of the optical pick-up head 110 .

As for the cutting reference level b of the mirror source signal 136 is correct, relative to the formed mirror signal 145 , the time length t5 of the first half cycle will be equal to the time length t6 of the second half cycle. The mirror signal 145 formed by cutting the mirror source signal 136 by the b reference level is the correct mirror signal 145 . Therefore, when the mirror signal 145 and the tracking error zero-crossing signal 146 formed by cutting the b reference level are used as the track jump action control of the optical pick-up head 110, the mirror signal 145 and the tracking error signal 146 are phase-matched, so that The track jumping action of the optical read/write head 110 is correct.

Please refer to FIG. 2 again. Under the structure of the preferred embodiment of the present invention, the problem of the above-mentioned cutting reference level being too high or too low can be solved by using the mirror signal adjuster 230 in the optical drive mirror signal automatic adjustment device 200, The mirror signal 211 generated by the pre-amplifier 210 is received, and the output adjustment signals 240 and 250 are fed back as a feedback control for adjusting the mirror signal 211 .

The optical drive mirror signal automatic adjustment device 200 adjusts the mirror signal 211 method by first reading the mirror signal 211, if the upper and lower half periods of the mirror signal 211 are asymmetrical, then adjust the mirror signal 211 so that the upper and lower half periods of the mirror signal 211 are symmetrical . Finally, the correct symmetrical mirror signal 211 of the upper and lower half periods can be input into the track jump controller 220 as the basis for the pair of optical read-write heads 210 to perform a track jump action.

Wherein, the mirror signal 211 output by the preamplifier 210 is still received by the internal mirror source signal generator 215 and the mirror cutting reference signal generator 217 from the signal 203 output by the optical head 201 to generate the mirror source signal 215 and The mirror cutting reference signal 218 is formed after being compared by a comparator 219 . Therefore, the method for adjusting the mirror signal 211 by the optical drive mirror signal automatic adjustment device 200 also includes: if compared by the comparator 219, the mirror cut reference level signal 218 cuts the reference level of the mirror source signal 216 too high or too low, resulting in When the upper and lower half periods of the mirror signal 211 are asymmetrical, the mirror signal adjuster 230 generates adjustment signals 250, 240 respectively to the mirror cutting reference signal generator 217 and the mirror source signal generator 215, so as to adjust the mirror cutting reference signal generator 217 and Some parameters inside the mirror source signal generator 215, and then adjust the cutting reference level of the mirror cutting reference signal 218 output by the mirror cutting reference signal generator 217 and the mirror source signal generator 215 and the waveform reference level of the mirror source signal 216 level, so that the cut reference level of the mirror source signal 216 provided by the mirror cut reference signal 218 is moderate.

Therefore, it can be seen from the method for adjusting the mirror signal 211 by the above-mentioned optical drive automatic mirror signal adjustment device 200 that the mirror signal adjuster 230 in the optical drive automatic mirror signal adjustment device 200 may, for example, be provided with a detector 260 for detecting the upper and lower half periods of the mirror signal 211, And a calibrator 270 for judging whether the upper and lower half cycles of the mirror signal 211 are symmetrical and calibrated. In a preferred embodiment of the present invention, the detector 260 can be, for example, a low-pass filter composed of resistors and capacitors or a digital counter, and outputs a result signal 280 to the calibrator 270 after detecting the mirror signal 211 . Among them, the low-pass filter can rectify the waveform of the mirror signal 211 into a voltage signal to reflect whether the upper and lower half cycles of the mirror signal 211 are symmetrical, and the counter can directly count the upper and lower half cycles of the mirror signal 211 to reflect the upper and lower half cycles of the mirror signal 211. Whether the half cycle is symmetric. The calibrator 270 can correspondingly control and output adjustment signals 240 and 250 to the cutting reference signal generator 217 and the mirror source signal generator 215 according to the result signal 280 .

The operation flow of the optical disc drive mirror signal automatic adjustment device 200 can refer to FIG. 4 , which is a flow chart of the operation steps of the optical disc drive mirror signal automatic adjustment device 200 in FIG. 2 according to a preferred embodiment of the present invention. When the preamplifier 210 starts to generate the mirror signal 211 , step 401 is entered. At this point, the detector 260 in the mirror signal adjuster 230 starts to read the mirror signal 211 output by the current stage amplifier 210 , which is to enter step 402 from step 401 .

Then, the mirror signal 211 passes through the low-pass filter 260 in the detector 260, and the counter 290 counts the time length of the upper and lower half cycles, and the calibrator 270 judges whether the mirror signal 211 is symmetrical with the upper and lower half cycle time lengths. Whether the reference level of the mirror source signal 216 is cut too high is determined from step 402 to step 403 . If the cutting reference level of the mirror source signal 216 is too high, then step 403 enters step 404, and the controller 293 outputs the adjustment signal 250 to the mirror cutting reference level generator 217 to lower the mirror cutting reference signal 218 to provide the mirror source signal 216 cutting reference level. If the cut reference level of the mirror source signal 216 is not too high, step 403 proceeds to step 405, and the controller 293 determines whether the cut reference level of the mirror source signal 216 is too low.

After calibrator 270 lowers the cutting reference level provided by mirror cutting reference signal 240 to mirror source signal 216 by adjusting signal 250, it proceeds from step 404 to step 406, and then judges whether the time length of the upper and lower half cycles of mirror signal 211 is symmetrical If it is symmetrical, then step 406 enters step 407 to stop the whole flow process, if it is not symmetrical, the calibrator 270 outputs the adjustment signal 250 to the preamplifier 125 again, so as to adjust the cutting reference voltage provided by the mirror cutting reference signal 240 to the mirror source signal 216 Level, and continue the process below step 402 Looking back, in step 405, if the mirror source signal 216 is cut by the reference level is too low, then enter step 409 from step 405, and the controller 293 outputs the adjustment signal 250 to the mirror cut The reference level generator 217 provides the cutting reference level of the mirror source signal 216 by adjusting the mirror cutting reference signal 218 . If the cut reference level of the mirror source signal 216 is not too high, then go from step 405 to step 407 to stop the whole process.

And when the calibrator 270 lowers the cutting reference level provided by the mirror cutting reference signal 240 to the mirror source signal 216 by the adjustment signal 250, it enters step 411 from step 409, and then judges whether the time length of the upper and lower half periods of the mirror signal 211 is Symmetrical, if symmetrical, go to step 407 from step 406 to stop the entire process, if not symmetrical, calibrator 270 then outputs adjustment signal 250 to pre-amplifier 125 to adjust the cutting reference provided by mirror cutting reference signal 240 to mirror source signal 216 level, and proceed to step 402 and below.

In addition, the stop of the entire process is not limited to the above. For example, when the number of cycles of the process reaches an appropriate value, or when the cutting reference level provided by the mirror cutting reference signal 240 to the mirror source signal 216 reaches When the limit is reached, the entire process steps can be stopped to prevent the continuous and non-stop operation of the entire process from affecting the track jumping action of the optical drive.

And by the above process steps, the optical disc drive mirror signal automatic adjustment device 200 can effectively adjust the mirror cutting reference signal 240 to generate the correct mirror signal 211 for the optical read-write head 201 to perform the track jumping action on the optical disc 205. The mirror signal automatic adjustment device 200 also has a complete set of operation mechanism.

To sum up the above, the present invention proposes a device and method for automatically adjusting the mirror signal of an optical drive. Through the detection and judgment adjustment mechanism, the mirror signal output by the pre-amplifier is received, and the output adjustment signal is fed back to control the mirror cutting reference signal to the mirror. The cut reference level of the source signal, while producing the correct mirror signal. Therefore, the optical read/write head of the optical drive can jump to the correct track when performing a track jumping action on the optical disc, so as to avoid the occurrence of sliding tracks and associated erroneous actions.

The above descriptions are only preferred embodiments of the present invention, and should not limit the scope of the present invention. All equivalent changes and modifications made according to the claims of the present invention will still not lose the gist of the present invention, nor depart from the spirit and scope of the present invention, and all should be regarded as further implementations of the present invention.

Claims (10)

1, a kind of CD-ROM drive mirror signal automatic regulating apparatus comprises:

One pre-amplifier receives the signal that an optical read head is exported, producing a mirror signal to the speed control of jumping onto the tracks, to control one of this optical read head action of jumping onto the tracks; And

One mirror signal adjuster receives and judges this mirror signal, adjusts signal and gives this mirror signal generator to export one, the basis that produces as this mirror signal.

2, CD-ROM drive mirror signal automatic regulating apparatus as claimed in claim 1, wherein this mirror signal adjuster also comprises:

One detecting device receives this mirror signal to detect this mirror signal semiperiod up and down, to export a consequential signal; And

One calibrating device receives and judges this consequential signal, to export this adjustment signal.

3, CD-ROM drive mirror signal automatic regulating apparatus as claimed in claim 2, wherein this pre-amplifier also comprises:

One minute surface source signal generator receives signal and this adjustment signal that this optical read/write head is exported, to produce a minute surface source signal;

One minute surface cutting reference signal generator receives signal and this adjustment signal that this optical read/write head is exported, to produce minute surface cutting reference signal; And

One comparer receives minute surface source signal, minute surface cutting reference signal, with the output mirror signal.

4, a kind of CD-ROM drive mirror signal automatic adjusting method comprises:

Read a mirror signal,, then adjust this mirror signal, so that the symmetry of semiperiod up and down of this mirror signal if the semiperiod up and down of this mirror signal is asymmetric;

Output is this mirror signal of semiperiod symmetry up and down, carries out the basis of jumping onto the tracks and moving with the optical read/write head as this CD-ROM drive.

5, CD-ROM drive mirror signal automatic adjusting method as claimed in claim 4, wherein this mirror signal provides minute surface source signal one cutting reference level to be formed by minute surface cutting reference signal.

6, CD-ROM drive mirror signal automatic adjusting method as claimed in claim 5 wherein also comprises:

If this cutting reference level too high, cause this mirror signal semiperiod is asymmetric up and down the time, turn down this cutting reference level, so that the reference level that this minute surface source signal is cut is moderate.

7, CD-ROM drive mirror signal automatic adjusting method as claimed in claim 5 wherein also comprises:

If this cutting reference level is too high, cause this mirror signal semiperiod is asymmetric up and down the time, heighten the waveform reference level of this minute surface source signal, so that the reference level that this minute surface source signal is cut is moderate; And

If after this cutting reference level of adjustment, the reference level that this minute surface source signal is cut is still higher and be the limit, then stops to adjust this cutting reference level.

8, CD-ROM drive mirror signal automatic adjusting method as claimed in claim 5 wherein also comprises:

If this cutting reference level low excessively, cause this mirror signal semiperiod is asymmetric up and down the time, turn down this cutting reference level, so that the reference level that this minute surface source signal is cut is moderate.

9, CD-ROM drive mirror signal automatic adjusting method as claimed in claim 5 wherein also comprises:

If this cutting reference level is low excessively, cause this mirror signal semiperiod is asymmetric up and down the time, turn down the waveform reference level of this minute surface source signal, so that the reference level that this minute surface source signal is cut is moderate; And

If after adjusting this cutting reference level, the reference level that this minute surface source signal is cut is still on the low side and for the limit, then stop to adjust this cutting reference level.

10, CD-ROM drive mirror signal automatic adjusting method as claimed in claim 9 wherein also comprises:

After adjusting this minute surface cutting reference signal reference level one suitable number of times, promptly stop to adjust this minute surface cutting reference signal.

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