CN1300777C - Interference removing apparatus and method for focusing error signal and tracking error signal - Google Patents
Interference removing apparatus and method for focusing error signal and tracking error signal Download PDFInfo
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- CN1300777C CN1300777C CNB2003101079972A CN200310107997A CN1300777C CN 1300777 C CN1300777 C CN 1300777C CN B2003101079972 A CNB2003101079972 A CN B2003101079972A CN 200310107997 A CN200310107997 A CN 200310107997A CN 1300777 C CN1300777 C CN 1300777C
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Abstract
The present invention provides an apparatus and a method for removing the interference of focusing error signals and tracking error signals. The apparatus comprises an LPF, a subtracter and a converting part, wherein the LPF receives radio frequency signals detected by a detector used for detecting the focusing error signals, the tracking error signals and the radio frequency signals, and converts the radio frequency signals into RFRP signals; the subtracter subtracts the RFRP signals obtained by the conversion from the focusing error signals and outputs M. FE signals; the converting part receives the M. FE signals output by the subtracter and the focusing error signals and outputs corresponding signals according to different converting positions. The apparatus and the method for removing the interference of focusing error signals and tracking error signals of the present invention can remove instable focusing servos caused by the interference of the tracking error signals to the focusing error signals.
Description
(1) technical field
The invention relates to the interference removal device of focus error signal and trail-and-error signal and method, especially about removing because the focus error signal that the trail-and-error signal causes, thereby make and realize the stable of focus servo.
(2) background technology
Fig. 1 is in the middle of the prior art, the structural representation of focus error signal and trail-and-error signal supervisory instrument.As shown in the figure, comprise with lower device:
Visual detector (photo detector:PD) 101, the optical analysis discs beam reflected, and detect;
Servo fault detecting device 102 will detected Signal Separation be trail-and-error signal and focus error signal from above-mentioned visual detector 101, and detect;
Electric power amplifier 103 receives from above-mentioned servo wrong detecting device 102 detected focus error signals and trail-and-error signal, and with the electric power amplification of signal;
Driver 104 carries out tracking servo and focus servo according to the signal that obtains after above-mentioned electric power amplifier 103 amplification.
With reference to above-mentioned Fig. 1, focusing mistake in the middle of the prior art and trail-and-error detection method are described.Fig. 2 is the central focusing mistake of prior art and the operational flowchart of trail-and-error method for detecting.As shown in Figure 2, the light beam of above-mentioned visual detector 101 execution analysis CD reflection, and detect S201; Here, above-mentioned visual detector 101 will be converted to electric signal from the light signal that semiconductor laser penetrates, and detect, in order to realize that tracking servo and focus servo that CD uses drive, and are divided into A with laser beam from the centre, B, C, D four parts detect the signal of each respective regions then.
Then, above-mentioned servo fault detecting device 102 is carried out and detect trail-and-error signal and focus error signal S202 from above-mentioned detected four kinds of signal.Here, above-mentioned light signal with above-mentioned laser is divided into 4 parts A, B, C, D is a benchmark, detect above-mentioned trail-and-error signal and focus error signal, above-mentioned trail-and-error signal can be according to mathematical expression TE={ (A+D)-(B+C) } * G1 obtains, above-mentioned focus error signal can be according to mathematical expression FE={ (A+C)-(B+D) } obtain.
Then, above-mentioned electric power amplification 103 above-mentioned detected trail-and-error signal TE of reception and the focus error signal FE of portion carry out electric power amplification S203 to it then.
Thereafter, above-mentioned driver 104 is carried out tracking servo and focus servo S204 according to trail-and-error signal TE and focus error signal FE that above-mentioned electric power amplification portion 103 amplification obtain.
In addition, Fig. 3 is the oscillogram by detected trail-and-error signal of prior art and focus error signal.As shown in Figure 3, detect trail-and-error signal and focus error signal by said method, carry out tracking servo and focus servo then, can cause the phase mutual interference, if at this moment two signals all are to detect the A that obtains in the above-mentioned visual detector 101, B, C, D signal are the basis, tracking servo is in and stops (OFF) state, and focus servo is in unlatching (ON) state, will detect the trail-and-error signal in the focus error signal, thereby can disturb focus error signal.
Therefore,, focus servo will occur influencing, make the focus servo instability, thereby can not accurately read the information on the CD, perhaps can in normal read processes, bring out mechanical noise (acoustic noise) if above-mentioned phenomenon is serious.
(3) summary of the invention
Therefore, the present invention carries out in order to address the above problem just.The object of the present invention is to provide the interference removal device and the method for a kind of focus error signal and trail-and-error signal, the method can be removed the focus servo instability that the interference of focus error signal is caused owing to the trail-and-error signal.
To achieve these goals, the interference removal device of focus error signal of the present invention and trail-and-error signal is characterized in comprising:
Low-pass filter receives by being used to detect focus error signal and trail-and-error signal, and the detected above-mentioned radiofrequency signal of the servo fault detecting device of radiofrequency signal, and is converted to the rf wave signal, this rf wave signal=above-mentioned radiofrequency signal * electric power amplification value;
Subtract the calculation device, from above-mentioned focus error signal, cut the above-mentioned rf wave signal that is converted to, and output correction focus error signal, this revises focus error signal=above-mentioned focus error signal-above-mentioned rf wave signal * increment;
Converter section receives above-mentioned subtracting and calculates correction focus error signal and the above-mentioned focus error signal of exporting in the device, and according to the difference of dislocation, the output corresponding signal wherein when tracking servo and focus servo all are in unlatching, is exported above-mentioned focus error signal; When tracking servo is in closed condition and focus servo when being in opening, export above-mentioned correction focus error signal.
Here, especially in order or to revise focus error signal and the conversion operations that carries out with output focus error signal in the above-mentioned converter section, the characteristics of described interference removal device also are, comprise and possess a system controller, can be to above-mentioned converter section input control signal, selectable output signal then.
In addition, to achieve these goals, the interference removal method of focus error signal of the present invention and trail-and-error signal is characterized in comprising following operating process:
Phase one receives by being used to detect focus error signal and trail-and-error signal, and the above-mentioned radiofrequency signal that detects of the servo fault detecting device of radiofrequency signal, and is converted to the rf wave signal, this rf wave signal=above-mentioned radiofrequency signal * electric power amplification value;
Subordinate phase cuts the above-mentioned rf wave signal that is converted to from above-mentioned focus error signal, and output correction focus error signal, and this revises focus error signal=above-mentioned focus error signal-above-mentioned rf wave signal * increment;
Phase III, receive above-mentioned subtracting and calculate correction focus error signal and the above-mentioned focus error signal of exporting in the device, difference according to dislocation, the output corresponding signal, the stage that in this stage, also comprises input control signal, realize the output of selectivity signal, wherein when tracking servo and focus servo all are in unlatching, export above-mentioned focus error signal; When tracking servo is in closed condition and focus servo when being in opening, export above-mentioned correction focus error signal.
For further specifying above-mentioned purpose of the present invention, design feature and effect, the present invention is described in detail below with reference to accompanying drawing.
(4) description of drawings
Fig. 1 is the structural representation of existing focus error signal and trail-and-error signal supervisory instrument.
Fig. 2 is the existing operational flowchart that focuses on wrong and trail-and-error detection method.
Fig. 3 is by the trail-and-error signal of prior art detection and the oscillogram of focus error signal.
Fig. 4 is the structural representation of the interference removal device of focus error signal of the present invention and trail-and-error signal.
Fig. 5 is the operational flowchart of the interference removal method of focus error signal of the present invention and trail-and-error signal.
Fig. 6 a is the detected radiofrequency signal oscillogram of the present invention.
Fig. 6 b is the oscillogram of the detected RFRP of the present invention (radio frequency ripple) signal.
Fig. 6 c is the oscillogram of the detected focus error signal of the present invention,
Fig. 6 d is detected M.FE signal waveforms according to the present invention.
(5) embodiment
Fig. 4 is the structural representation of the interference removal device of focus error signal of the present invention and trail-and-error signal.
As shown in the figure, the interference removal device of focus error signal and trail-and-error signal comprises:
Visual detector (photo detector:PD) 401, the optical analysis discs beam reflected, and detect;
Servo fault detecting device 402 will detected Signal Separation be trail-and-error signal and focus error signal from above-mentioned visual detector 40l, and radiofrequency signal, and detect;
Low-pass filter (LPF:low pass filter) 403, reception is by being used to detect focus error signal and trail-and-error signal, and servo fault detecting device 402 detected above-mentioned radio frequency (radio frequency) signals of radiofrequency signal, and be converted to RFRP (radio frequency ripple: signal rf wave);
Subtract and calculate device 404, from above-mentioned focus error signal, cut the above-mentioned RFRP signal that is converted to, and output M.FE (Modify focus error: revise and focus on mistake) signal;
Converter section 405 receives above-mentioned M.FE signal and the above-mentioned focus error signal of calculating output in the device 404 that subtract, according to the difference of dislocation, and the output corresponding signal.
System controller 406 can be to above-mentioned converter section 405 input control signals, then selectable output signal.
Electric power amplifier 407 receives from above-mentioned servo fault detecting device 402 detected focus error signals and trail-and-error signal, and with the electric power amplification of signal;
Driver 408 carries out tracking servo and focus servo according to the signal that obtains after above-mentioned electric power amplifier 407 amplification.
Here, with reference to Fig. 4 the interference removal method of focus error signal of the present invention and trail-and-error signal is described.Fig. 5 is the operational flowchart of the interference removal method of focus error signal of the present invention and trail-and-error signal.As shown in the figure, above-mentioned visual detector 401 optical analysis discs folded light beams, and carry out detected operation S501.Here, above-mentioned visual detector 401 will be converted to electric signal from the light signal that semiconductor laser penetrates, and detect, in order to realize that tracking servo and focus servo that CD uses drive, and are divided into A with laser beam from the centre, B, C, D four parts detect the signal of each respective regions then.
Then, will carry out and from above-mentioned detected four kinds of signals, separate trail-and-error signal TE and focus error signal FE, and radiofrequency signal, and detect S502.Here, be divided into 4 parts A with the light signal of above-mentioned laser, B, C, D is a benchmark, detect above-mentioned trail-and-error signal and focus error signal, above-mentioned trail-and-error signal can be according to mathematical expression TE={ (A+D)-(B+C) } * G1 obtains, above-mentioned focus error signal can be according to mathematical expression FE={ (A+C)-(B+D) } * G2 obtains.(G1 here and G2 refer to electric power amplification value.)
In addition, Fig. 6 a is the detected radiofrequency signal oscillogram of the present invention, and above-mentioned radiofrequency signal is tried to achieve by RF=A+B+C+D.
In addition, above-mentioned low-pass filter 403 is carried out detected radiofrequency signal is converted to RFRP signal S503.Fig. 6 b is the oscillogram of the detected RFRP signal of the present invention.As shown in the figure, above-mentioned radiofrequency signal becomes RFRP=(A+B+C+D) * G3 by above-mentioned low-pass filter 403.
Here, the above-mentioned calculation device 404 that subtracts will be carried out the RFRP signal that the above-mentioned low-pass filter 403 of reception is converted to, and cut the above-mentioned RFRP signal that is converted to from above-mentioned focus error signal, and the operation S504 of output M.FE signal.Here, Fig. 6 c as shown in the figure, cuts the waveform shown in above-mentioned Fig. 6 b for the oscillogram of the detected focus error signal of the present invention from focus error signal.
In addition, above-mentioned subtracting calculates that device 404 obtains two kinds of signal subtractions and the signal exported is M.FE (Modifyfocus error: revise focus on wrong).Here, Fig. 6 d is detected M.FE signal waveforms according to the present invention.As shown in the figure, if from above-mentioned focus error signal, cut the RFRP signal, will export the M.FE that has carried out distortion, and above-mentioned M.FE tries to achieve (G4 is an increment) by M.FE=FE-G4*RFRP.
Thereafter, above-mentioned converter section 405 is just carried out and is received above-mentioned M.FE signal and the above-mentioned focus error signal of calculating output in the device 404 that subtract, according to the difference of dislocation, and output corresponding signal S505.Here, the conversion operations of above-mentioned converter section 405 control is to operate and output signal by the control signal of said system controller 406 inputs.
If above-mentioned tracking servo and above-mentioned focus servo all are in opening, disturb because signal can not occur, so the above-mentioned control signal of just importing is carried out conversion and control, thereby can export above-mentioned focus error signal.But, focus servo is in opening if tracking servo is in closed condition, will detect the trail-and-error signal in the focus error signal, thereby causes interference, thereby will import the control signal that to export above-mentioned M.FE signal, and then change.Therefore, according to the difference of the On/Off state of above-mentioned trail-and-error signal, the signal of conversion and output also can be different.
Then, above-mentioned electric power amplifier 407 receives from above-mentioned servo fault detecting device 402 detected focus error signals and trail-and-error signal, and with the electric power amplification S506 of signal.Driver 408 carries out tracking servo and focus servo S507 according to the signal that obtains after above-mentioned electric power amplifier 407 amplification.
The interference removal device and the method for focus error signal of the present invention and trail-and-error signal can be removed the focus servo instability that the interference of focus error signal is caused owing to the trail-and-error signal.
Though the present invention describes with reference to current specific embodiment, but those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the present invention, should understand and wherein can make variations and modifications and do not break away from the present invention in a broad sense, so be not as limitation of the invention, as long as in connotation scope of the present invention, all will drop in the scope of claims of the present invention variation, the distortion of the above embodiment.
Claims (3)
1. the interference removal device of focus error signal and trail-and-error signal is characterized in that comprising:
Low-pass filter receives by being used to detect focus error signal and trail-and-error signal, and the above-mentioned radiofrequency signal that detects of the servo fault detecting device of radiofrequency signal, and is converted to the rf wave signal, this rf wave signal=above-mentioned radiofrequency signal * electric power amplification value;
Subtract the calculation device, from above-mentioned focus error signal, cut the above-mentioned rf wave signal that is converted to, and output correction focus error signal, this revises focus error signal=above-mentioned focus error signal-above-mentioned rf wave signal * increment;
Converter section receives above-mentioned subtracting and calculates correction focus error signal and the above-mentioned focus error signal of exporting in the device, and according to the difference of dislocation, the output corresponding signal wherein when tracking servo and focus servo all are in unlatching, is exported above-mentioned focus error signal; When tracking servo is in closed condition and focus servo when being in opening, export above-mentioned correction focus error signal.
2. the interference removal device of focus error signal as claimed in claim 1 and trail-and-error signal, it is characterized in that: in order or to revise focus error signal and the conversion operations that carries out output focus error signal in the above-mentioned converter section, described interference removal device also comprises possessing a system controller, can be to above-mentioned converter section input control signal, selectable output signal then.
3. the interference removal method of focus error signal and trail-and-error signal is characterized in that comprising following operating process:
Phase one receives by being used to detect focus error signal and trail-and-error signal, and the above-mentioned radiofrequency signal that detects of the servo fault detecting device of radiofrequency signal, and is converted to the rf wave signal, this rf wave signal=above-mentioned radiofrequency signal * electric power amplification value;
Subordinate phase cuts the above-mentioned rf wave signal that is converted to from above-mentioned focus error signal, and output correction focus error signal, and this revises focus error signal=above-mentioned focus error signal-above-mentioned rf wave signal * increment;
Phase III, receive above-mentioned subtracting and calculate correction focus error signal and the above-mentioned focus error signal of exporting in the device, difference according to dislocation, the output corresponding signal, the stage that in this stage, also comprises input control signal, realize the output of selectivity signal, wherein when tracking servo and focus servo all are in unlatching, export above-mentioned focus error signal; When tracking servo is in closed condition and focus servo when being in opening, export above-mentioned correction focus error signal.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101079972A CN1300777C (en) | 2003-10-17 | 2003-10-17 | Interference removing apparatus and method for focusing error signal and tracking error signal |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2003101079972A CN1300777C (en) | 2003-10-17 | 2003-10-17 | Interference removing apparatus and method for focusing error signal and tracking error signal |
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| CN1609954A CN1609954A (en) | 2005-04-27 |
| CN1300777C true CN1300777C (en) | 2007-02-14 |
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| CNB2003101079972A Expired - Fee Related CN1300777C (en) | 2003-10-17 | 2003-10-17 | Interference removing apparatus and method for focusing error signal and tracking error signal |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2007317284A (en) * | 2006-05-25 | 2007-12-06 | Hitachi Ltd | Optical disk device |
| CN113325265A (en) * | 2021-05-12 | 2021-08-31 | 武汉三相电力科技有限公司 | Device for detecting mixed traveling wave in power transmission line |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0718832A1 (en) * | 1994-12-22 | 1996-06-26 | Sony Corporation | Reproduction of optical discs |
| CN1227384A (en) * | 1998-02-26 | 1999-09-01 | 联发科技股份有限公司 | Automatic regulator and method for optimum focusing point of CD machine |
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2003
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0718832A1 (en) * | 1994-12-22 | 1996-06-26 | Sony Corporation | Reproduction of optical discs |
| CN1227384A (en) * | 1998-02-26 | 1999-09-01 | 联发科技股份有限公司 | Automatic regulator and method for optimum focusing point of CD machine |
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