CN1988010A - Device and method for regulating optic disc device loop gain - Google Patents
Device and method for regulating optic disc device loop gain Download PDFInfo
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- CN1988010A CN1988010A CN 200510111953 CN200510111953A CN1988010A CN 1988010 A CN1988010 A CN 1988010A CN 200510111953 CN200510111953 CN 200510111953 CN 200510111953 A CN200510111953 A CN 200510111953A CN 1988010 A CN1988010 A CN 1988010A
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- 230000008676 import Effects 0.000 claims description 3
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Abstract
This invention relates to a disk device ring-loop gain adjustment device and a method including: setting a sine wave frequency and a target phase difference adjusting ring loop gain to any values input by users, generating sine wave signals of the set frequency to be synthesized with servo error signal to be filtered by a band-pass filter, testing the phase difference between the synthesized signal and sine wave signal to finish the adjustment operation of the ring-loop gain when the phase difference is the same with the target phase difference, which can automatically adjust servo-ring loop gain on various digital video disk players so as to carry out follow servo and focus servo.
Description
Technical field
The present invention relates to a kind of optic disc device loop gain regulating device and method, refer in particular in Digital video disc player (DVD-Player) or various types of compact disk equipments similar to the Digital video disc player, automatically regulate servo loop gain (Servo Loop Gain), so that can stably carry out a kind of optic disc device loop gain regulating device and the method for tracking servo (Tracking Servo) and focus servo (Focusing Servo).
Background technology
Fig. 1 is the loop gain regulating device organigram of normal optical disk equipment.Constitute by sinusoidal wave generating unit 10, bandpass filter (BPF) 11, phase differential detecting element 12, loop gain adjusting portion 13, servo loop wave filter 14, loop gain device the 15, the 1st organ stop 16 and the 2nd organ stop 17 in above-mentioned loop gain regulating device.
In addition, sinusoidal wave generating unit 10 generates the sine wave signal of the predefined assigned frequency of output.As shown in Figure 1, above-mentioned the 1st organ stop 16 is synthetic with above-mentioned sine wave (Sine Wave) signal and tracking error signal (or focus error signal), simultaneously to above-mentioned phase differential detecting element 12 outputs, after 17 approvals of above-mentioned the 2nd organ stop, above-mentioned tracking error signal (or poly-error signal) (A) is synthesized with the 1st organ stop 16 synthetic signals (B).
In addition, export to loop gain device 15 through servo loop wave filter 14 by the 1st organ stop 16 synthetic signals (B).By signal (A+B) the process bandpass filter 11 that above-mentioned the 2nd organ stop 17 synthesizes, input phase difference detecting element 12.So phase differential detecting element 12 detects the composite signal (A+B) of the regulation wave band that filters by bandpass filter 11 and the phase differential (Phase Difference) between sine wave signal.
Loop gain adjusting portion 13 compares phase differential and the predefined target phase difference that phase differential detecting element 12 detects, and makes its data consistent with each other.By regulation loop multiplier (-icator) 15, output makes tracking error signal (or focus error signal) become minimum tracking driving voltage (or focus driving voltages).
In addition, as shown in Figure 2, loop gain is to be that corresponding phase differential is " 90 degree " on the point of zero crossing (ZeroCrossing) on the point of zero (Zero) on the normal optical disk equipment.So, above-mentioned phase differential being set on " 90 degree ", loop gain adjusting portion 13 is carried out the activity of a series of regulation loop multiplier (-icator)s 15, and the phase difference value that phase differential detecting element 12 is detected is 90 degree.
But speed and storage times speed improve significantly because the compact disk equipment that comes out along with nearest exploitation reads doubly, the performance requirement of tracking servo or focus servo are also become higher, so sine wave freuqency that need be higher.For example, when sample frequency stationary state detected phase difference, the resolution (Resolution) of using high_frequency sine wave to measure phase differential is lower than the resolution of using low-frequency sine to measure phase differential relatively, therefore has the accurately problem of regulation loop gain.
Summary of the invention
The present invention proposes for addressing the above problem just.The object of the present invention is to provide the loop gain regulating device and the method for compact disk equipment.For example, can on compact disk equipment, regulate the servo loop gain automatically, so that stably carry out tracking servo and focus servo.Frequency by will regulating the sine wave signal that the gain of above-mentioned servo loop needs and target phase difference are set at by the user and select the variable value imported arbitrarily, so that more effectively improve the resolution (Resolution) that is used for detecting phase differential.
To achieve these goals, be divided into 3 steps according to the loop gain control method of compact disk equipment of the present invention: the 1st step will be used for the sine wave freuqency of regulation loop gain and the arbitrary value that target phase difference is set at user's input respectively; The 2nd step after generating the sine wave signal of above-mentioned setpoint frequency and servo error signal and mixing, is carried out filtering by bandpass filter; The 3rd step detects the phase differential between filtered composite signal and sine wave signal, under the situation consistent with above-mentioned target phase difference, finishes the operation of loop gain-adjusted.
In addition, include the sinusoidal wave generating unit of the sine wave signal that produces regulation loop gain needs according to the loop gain regulating device of compact disk equipment of the present invention; The synthesizer of synthetic above-mentioned sine wave signal and servo error signal; Detect the phase differential detecting element of the phase differential between above-mentioned filtered composite signal and sine wave signal; The phase differential that above-mentioned phase differential detecting element detects is compared the loop gain adjusting portion of regulation loop gain with target phase difference; The servocontrol portion that is set at any selective value of user respectively with the frequency and the target phase difference of above-mentioned sine wave signal.
Effect of the present invention:
A kind of optic disc device loop gain regulating device of the present invention and method can be regulated the servo loop gain, automatically so that stably carry out tracking servo and focus servo on various compact disk equipments such as Digital video disc player.Frequency by will regulating the sine wave signal that the gain of above-mentioned servo loop needs and target phase difference are set at by the user and select any variable value of importing, more effectively improve the resolution that detects phase differential, therefore can fine regulate the servo loop gain.In the compact disk equipment of high power speed, also can stably carry out tracking servo and focus servo.
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.
Description of drawings
Fig. 1 is the loop gain regulating device organigram of normal optical disk equipment;
Fig. 2 represents the phase differential that the loop gain regulating device of normal optical disk equipment detects, regulates and the synoptic diagram of loop gain with the form of coordinate;
Fig. 3 is the loop gain regulating device organigram according to compact disk equipment of the present invention;
Fig. 4 represents according to any variable sine wave freuqency of the present invention's setting and the embodiment synoptic diagram of target phase difference with the form of coordinate;
Thereby Fig. 5 is the embodiment synoptic diagram in any variable sine wave freuqency of foundation the present invention setting and phase differential raising resolution;
Fig. 6 is the operational scheme synoptic diagram according to optic disc device loop gain control method of the present invention.
The symbol description of major part in the accompanying drawing:
10,20: sinusoidal wave generating unit 11,21: bandpass filter
12,22: phase differential detecting element 13,23: loop gain adjusting portion
14,24: servo loop wave filter 15,25: loop gain
16,17,26,27: organ stop 28: servo controller
Embodiment
With reference to the accompanying drawings the embodiment according to optic disc device loop gain regulating device of the present invention and method is described in detail.
Fig. 3 is the loop gain regulating device organigram according to compact disk equipment of the present invention.Above-mentioned loop gain regulating device includes sinusoidal wave generating unit 20, bandpass filter (BPF) 21, phase differential detecting element 22, loop gain adjusting portion 23, servo loop wave filter 24, loop gain device the 25, the 1st organ stop 16 and the 2nd organ stop 17, and the servo controller 28 that sine wave freuqency and target phase difference is set at arbitrary value.
On the other hand, according to user's input, the control signal (Freq_CTL) (variable) of the above-mentioned sinusoidal wave generating unit 20 of above-mentioned servo controller 28 output controls makes sinusoidal wave generating unit generate sine (Sine Wave) the ripple signal that contains optional frequency.Simultaneously the target phase difference (Target_PH_Diff) of above-mentioned loop gain adjusting portion 23 is made as the arbitrary value of user's input.
In addition, as shown in Figure 4, if make optical disk servo-system open loop tansfer function correspondence on target zero crossing frequency " A " point, for example, though sine wave freuqency can be set at original 2KHz, simultaneously target phase difference is set at 90 degree, but differs 50 when spending, also may correspond to the target zero cross point at " B " some phase differential.
Sine wave freuqency is set at 1KHz, simultaneously target phase difference is set at 50 degree.For example, as shown in Figure 5, the resolution of the resolution (Resolution) that detects phase differential when using the sine wave signal of 1KHz frequency during than the sine wave signal that uses the 2KHz frequency is more accurate, so loop gain adjusting portion 23 can be regulated the servo loop gain more accurately.To do detailed explanation to this below.
Fig. 6 is the operational scheme synoptic diagram according to optic disc device loop gain control method of the present invention.
S10 is being set at loop gain adjusting (Loop Gain Control) pattern.
S11, the user selects any sine wave freuqency value of importing, for example, and under the situation of selecting input " 1KHz ", above-mentioned servo controller 28 is set at " 1KHz ", control signal (Freq_CTL) input sine wave generating unit 20 that simultaneously will be corresponding with it with the sine wave of regulation loop gain.
S12, in addition, servo controller 28 is for example selected under the situation of input " 50 degree " at the arbitrary target phase difference value of user's input, and the target phase difference that regulation loop is gained is set at " 50 degree ".
S13 through above-mentioned series of identical process, confirms whether sine wave freuqency and target phase difference are set at the arbitrary value that the user imports.
S14, on the other hand, above-mentioned sinusoidal wave generating unit 20 generates and exports the sine wave signal of " 1KHz " frequency according to the control signal of above-mentioned controller output.As mentioned above, by the 1st organ stop 26 that sine wave signal and tracking error signal (or focus error signal) is synthetic as synthesizer, simultaneously to above-mentioned phase differential detecting element 22 outputs.Above-mentioned tracking error signal (or focus error signal) (A) is synthesized after 27 approvals of above-mentioned the 2nd organ stop and by the 1st organ stop 26 synthetic signals (B).
S15, and 26 synthetic signal B import to loop gain device 25 through servo loop wave filter 24 by the 1st organ stop.Has only the wave band of regulation by bandpass filter 21 in the signal (A+B) that above-mentioned the 2nd organ stop 27 synthesizes.
S16, therefore, phase differential detecting element 22 can detect the composite signal (A+B) of the regulation wave band that bandpass filter 21 leaches and the phase differential (Phase Difference) between sine wave signal.Above-mentioned loop gain adjusting portion 23 compares phase differential and any target phase difference of setting of user " 50 degree " that above-mentioned phase differential detecting element 22 detects.
S17 judges whether the numerical value of said two devices is consistent.
S18 if above-mentioned judged result is inconsistent, then carries out loop gain and regulates operation 25.
If S19 consistent, then set and continues to keep loop gain, after this finishes the operation of loop gain-adjusted.Therefore can not only stably move tracking servo or focus servo, and improve the resolution that detects phase differential greatly, can more accurate adjusting servo loop gain.
Those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the present invention, and be not to be used 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 modification of the above embodiment.
Claims (8)
1, a kind of loop gain control method of compact disk equipment is characterized in that comprising following 3 steps:
The 1st step, sine wave freuqency and the target phase difference with the regulation loop gain is set at the arbitrary value that the user imports respectively;
The 2nd step, generate the sine wave signal of frequency of above-mentioned setting and servo error signal synthetic after, bandpass filter is carried out filtering;
The 3rd step detects the phase differential between above-mentioned filtered composite signal and sine wave signal, when consistent with above-mentioned target phase difference, finishes the adjusting operation of loop gain.
2, the loop gain control method of compact disk equipment as claimed in claim 1.It is characterized in that:
Above-mentioned composite signal that leaches and the phase differential between sine wave signal, behind the regulation loop yield value, are carrying out bandpass filtering and phase differential repeatedly and are detecting when inconsistent with target phase difference.
3, the loop gain control method of compact disk equipment as claimed in claim 1.It is characterized in that:
According to user's selection, above-mentioned sine wave freuqency can be made as the arbitrary value that can improve the resolution that detects phase differential.
4, the loop gain control method of compact disk equipment as claimed in claim 1.It is characterized in that:
According to user's selection, above-mentioned target phase difference can be set at other target phase difference arbitrarily that is not 90 degree.
5, a kind of loop gain regulating device of compact disk equipment is characterized in that comprising:
The sinusoidal wave generating unit of the sine wave signal that the gain of generation regulation loop needs;
The synthesizer of synthetic above-mentioned sine wave signal and servo error signal;
Detect the phase differential detecting element of the phase differential between above-mentioned filtered composite signal and sine wave signal;
The phase differential that above-mentioned phase differential detecting element detects is compared the loop gain adjusting portion of regulation loop gain with target phase difference;
The servocontrol portion that is set at the optional value of user respectively with the frequency and the target phase difference of above-mentioned sine wave signal.
6, the loop gain regulating device of compact disk equipment as claimed in claim 5.It is characterized in that:
The regulation loop gain of described servocontrol portion makes above-mentioned composite signal through filtering consistent with target phase difference with the phase differential between sine wave signal.
7, as the loop gain regulating device of the above-mentioned compact disk equipment of claim 5.It is characterized in that:
Described servocontrol portion is according to user's input, and the sine wave freuqency of generating apparatus is set at the optional frequency value that can improve the resolution that detects phase differential.
8, the loop gain regulating device of compact disk equipment as claimed in claim 5.It is characterized in that:
Described servocontrol portion is according to user's input, the target phase difference of detection device is set at detects other arbitrary values that the phase differential target is not 90 degree.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510111953 CN1988010A (en) | 2005-12-23 | 2005-12-23 | Device and method for regulating optic disc device loop gain |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510111953 CN1988010A (en) | 2005-12-23 | 2005-12-23 | Device and method for regulating optic disc device loop gain |
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| CN1988010A true CN1988010A (en) | 2007-06-27 |
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| CN 200510111953 Pending CN1988010A (en) | 2005-12-23 | 2005-12-23 | Device and method for regulating optic disc device loop gain |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102289130A (en) * | 2010-06-03 | 2011-12-21 | 安森美半导体贸易公司 | Loop gain adjusting circuit |
| CN101382772B (en) * | 2007-09-07 | 2012-12-26 | 三星电子株式会社 | Reduced noise servo control |
| CN108282162A (en) * | 2017-01-06 | 2018-07-13 | 联咏科技股份有限公司 | Clock and data recovery circuit with improved jitter tolerance |
-
2005
- 2005-12-23 CN CN 200510111953 patent/CN1988010A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101382772B (en) * | 2007-09-07 | 2012-12-26 | 三星电子株式会社 | Reduced noise servo control |
| CN102289130A (en) * | 2010-06-03 | 2011-12-21 | 安森美半导体贸易公司 | Loop gain adjusting circuit |
| CN102289130B (en) * | 2010-06-03 | 2014-03-05 | 半导体元件工业有限责任公司 | Loop gain adjusting circuit |
| CN108282162A (en) * | 2017-01-06 | 2018-07-13 | 联咏科技股份有限公司 | Clock and data recovery circuit with improved jitter tolerance |
| CN108282162B (en) * | 2017-01-06 | 2021-08-31 | 联咏科技股份有限公司 | Clock and Data Recovery Circuits with Improved Jitter Tolerance |
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