CN1299272C - Multi-mode filter and its filtering method - Google Patents
Multi-mode filter and its filtering method Download PDFInfo
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- CN1299272C CN1299272C CNB011105003A CN01110500A CN1299272C CN 1299272 C CN1299272 C CN 1299272C CN B011105003 A CNB011105003 A CN B011105003A CN 01110500 A CN01110500 A CN 01110500A CN 1299272 C CN1299272 C CN 1299272C
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Abstract
The present invention relates to a multi-mode filtering device and a filtering method thereof, which is mainly used for filtering the position error signal of an optical disk drive. The multi-mode filtering device comprises a central filter, a band-pass filter and a switcher. In the method, the central filter outputs a narrow-frequently signal after filtering the position error signal; the band-pass filter outputs a wide-frequently signal after filtering the position error signal, and the narrow-frequently signal or the wide-frequently signal is decided to be output by the switcher according to the writing mode by the optical disk drive. The present invention can effectively inhibit the position error signal, and does not need outside frequency to dynamically regulate the central frequency of the filters.
Description
Technical field
The relevant a kind of filter of the present invention, particularly a kind of multi-mode filter and filtering method thereof that is used for CD drive.
Background technology
With regard to present medium, the application of CD drive is very extensive, and optical disc memory also becomes the basic outfit of PC already, in recent years more because the popularizing of CD-R and CD-RW, make recording of data backup or musical film be more prone to, started really and examined the record agitation for a moment.The data storing of general optical disk is to carry out in the mode of constant linear velocity, so up to now, can write the formula CD drive, for example read-only optical disc, read-write CD, corresponding digital CD DVD-R, DVD-RW, DVD+RW or DVD-RAM etc., its writing mode is all the pattern that writes of constant linear velocity, therefore, no matter the pick-up head of CD drive is positioned at disc outer ring or inner ring, its speed that writes data all is maintained fixed, after being developed to high power speed, the writing speed of data also will be subject to the rev limit of motor, and can't continue to improve.Therefore, the mode that people just write data turns to the mode of Constant Angular Velocity to develop, for instance, 16 times of machines that fast clv mode writes, its inner ring rotating speed is 8000rpm, writes as if changing the pattern of inner ring with 16 times of fast Constant Angular Velocity into, and then the outer ring can reach 40 times of speed.
In the conventional art, for the position of each data in the nominal light disc, track can be divided into many paragraphs, for example divide in the mode of minute (m), second (s), section, it is exactly a kind of very general practice, in addition, more develop the practice that makes new advances, the rail flanges at CD forms wavy profile exactly, when CD rotates, if utilize the laser radiation track, its reflected light will be swung with rail flanges, has formed so-called speed change (swing) signal; If utilize mode of frequency regulation will carve the absolute time of time slot (Absolute Time In Pre-groove in advance, hereinafter to be referred as ATIP) be coded in the variable rate signal, so, CD drive is after receiving the reflected signal of laser, variable rate signal can be picked up out, and decoded, can learn the position of pick-up head by the absolute time signal that solves.Please refer to Figure 1A, the structure of the write formula discs that its expression is traditional.Discs 100 for example is CD-R, CD-RW, DVD-R, DVD-RW, DVD+RW or DVD-RAM etc. for can write the formula discs, and portrayal has track 130 on the discs 100, with storage data.Then please refer to Figure 1B, its expression track 130 is specially made continuous corrugated profiles, thus utilize after suitable filtering circuit picks up out with variable rate signal, can be with the absolute time signal decoding, to learn the position of pick-up head; Therefore, for the location of read head, picking up of variable rate signal just seems quite important.Please refer to Fig. 1 C, the relation between its expression OPTICAL SENSORS and the track.OPTICAL SENSORS comprises sensor 171, sensor 173, sensor 175 and sensor 177, and the drop point zone 150 of laser represents with dotted line that then as can be seen from Figure, sensor 171,173,175,177 all can sense laser signal simultaneously.Under the pattern of constant linear velocity, the frequency of variable rate signal is 22.05KHz ± 1KHz, its centre frequency is fixed on 22.05KHz, because ATIP is coded in the variable rate signal, therefore only need the variable rate signal decoding can be learnt ATIP, the modal practice is to utilize the main beam push-pull signal to pick up out variable rate signal.For instance, suppose that sensor 171 measured numerical value are A, sensor 173 measured numerical value are B, sensor 175 measured numerical value are C, sensor 177 measured numerical value are D, and then the main beam push-pull signal can be designated as (A+D)-(B+C), is the center-filter filtering of 22.05KHz with the centre frequency with the main beam push-pull signal, can obtain a narrow frequency variable rate signal, to learning ATIP after the narrow frequency variable rate signal decoding.Then please refer to Fig. 2, the variable rate signal pick device under its expression clv mode.Briefly, export after the method for extraction variable rate signal 255 utilizes center-filter 270 with main filtered push pull signal 250 filtering exactly and get final product, at one times when fast, because the centre frequency of center-filter 270 is 22.05KHz, so the frequency of the narrow frequency variable rate signal of exporting from center-filter 270 255 also is 22.05KHz.
It should be noted that read or write speed when CD drive is one times when fast and since under clv mode the fixed-frequency of variable rate signal at 22.05KHz ± 1KHz, so adopt the wave filter of dead center frequency variable rate signal can be taken out; But when Constant Angular Velocity mode, because the linear velocity of disc inner ring is lower, and the linear velocity of outer ring is higher, and variable rate signal can accelerate with the linear velocity increase, so to the outer ring, the frequency of variable rate signal can increase to 22.05 * 2.5KHz by 22.05KHz, therefore from the disc inner ring, under Constant Angular Velocity mode, can't adopt the wave filter of dead center frequency, in addition design; That is to say, because the received variable rate signal of pick-up head can have different frequencies because the radial position at pick-up head place is different under Constant Angular Velocity mode, so just have the people to propose dynamically to adjust the method for the centre frequency of wave filter according to the difference of variable rate signal frequency, to filter out the variable rate signal of various frequencies, but because this idea must be determined the frequency of variable rate signal earlier, could adjust wave filter according to this, therefore, suffer sizable difficulty.As everyone knows, pick-up head is when searching data, its speed that moves is quite high, therefore, want to grasp constantly variable rate signal frequency at that time, but still do not have the feasible practice, in other words, dynamically the idea of adjusting the filter center frequency still can't realize so far, also becomes the main bottleneck of development Constant Angular Velocity technology.
Summary of the invention
The object of the present invention is to provide a kind of multi-mode filter and filtering method thereof that improves disc accessing speed, can support CD drive simultaneously and write data with clv mode or Constant Angular Velocity mode.
According to purpose of the present invention, a kind of multi-mode filter and method thereof are proposed, be summarized as follows:
Multi-mode filter of the present invention comprises center-filter, bandpass filter and switch; The centre frequency of center-filter is fixed, and be suitable for clv mode and extract variable rate signal, and bandpass filter can be utilized Hi-pass filter be connected in series with low-pass filter to form, and it operates frequency domain broadness, suitablely picks up variable rate signal with Constant Angular Velocity mode.Effect by center-filter, can be with the variable rate signal of a narrow frequency of output after the position error signal filtering, and by bandpass filter with position error signal filtering after output a wideband variable rate signal, the pattern that writes that sets according to CD drive, can determine to export with narrow frequency variable rate signal output or with the wideband variable rate signal, by coupling of switch and two filter, can be easily the two selects an output from narrow frequency variable rate signal and wideband variable rate signal.
For achieving the above object, the present invention takes following concrete measure:
Multi-mode filter of the present invention in order to filtering a position error signal, and produces the output signal of a tool certain frequency, comprising: a center-filter, a bandpass filter and a switch;
The input end of center-filter and bandpass filter is connected, and as the input end of filter, the output terminal of center-filter and bandpass filter connects the input end of switch respectively;
Center-filter is in order to the strain position error signal, and produces a narrow frequency signal;
Bandpass filter is in order to the strain position error signal, and produces a broadband signal;
Switch is selected one and is coupled between center-filter and bandpass filter.
Wherein, described bandpass filter comprises: Chuan Jie a Hi-pass filter and low-pass filter mutually;
Hi-pass filter is in order to filter described position error signal;
Low-pass filter is in order to receive and to filter the signal of Hi-pass filter output.
Wherein, the cutoff frequency of described Hi-pass filter is the integral multiple of 22.05KHz.
Wherein, the cutoff frequency of described low-pass filter is the integral multiple of 55KHz.
Wherein, the centre frequency of described filter output signal is the integral multiple of 22.05KHz.
The filtering method of multi-mode filter of the present invention in order to handle the position error signal of a CD drive, may further comprise the steps:
The input position error signal is to the multi-mode filter;
Write the operation frequency domain that pattern is set multi-mode filter according to the CD drive data;
Filter described position error signal, and produce the output signal of a tool certain frequency.
Description of drawings
Reaching embodiment in conjunction with the accompanying drawings is described in detail as follows architectural feature of the present invention and method feature thereof:
The accompanying drawing simple declaration:
Figure 1A: the existing synoptic diagram that can write the formula discs;
Figure 1B: the detailed structure synoptic diagram of Figure 1A middle orbit;
Fig. 1 C: concern synoptic diagram between optical receiver and the track;
Fig. 2: the synoptic diagram of variable rate signal pick device under the clv mode;
Fig. 3: the circuit block diagram of multi-mode filter embodiment of the present invention;
Fig. 4: the circuit block diagram of bandpass filter among Fig. 3;
Fig. 5: the distribution scenario of signal in frequency domain such as servo error signal group, bandpass filter frequency range and radiofrequency signal group in the CD drive.
Embodiment
The present invention is under Constant Angular Velocity mode, pick up variable rate signal with the bandpass filter that frequency band is comparatively broad, and the frequency range of this bandpass filter can be contained the frequency range of variable rate signal, therefore, no matter be positioned at the variable rate signal of CD inner ring or outer ring, its frequency all will drop within the frequency range of bandpass filter, no matter how the frequency of variable rate signal changes all can effectively it be extracted.
Please refer to Fig. 3, the circuit block diagram of an embodiment of its expression multi-mode filter of the present invention.Multi-mode filter 300 comprises center-filter 270, bandpass filter 370 and switch 390, each is interelement to couple relation as shown in the figure, at one times when fast, the centre frequency of center-filter 270 is 22.05KHz, after filtering the main beam push-pull signal 250 under the clv mode, export narrow frequency variable rate signal 255; And the operating frequency of bandpass filter 370 is 22.05KHz～55KHz, after filtering the main beam push-pull signal 250 under the Constant Angular Velocity mode, and the variable rate signal 355 of output wideband.If CD drive adopts the clv mode operation, can utilize coupling of switch 390 and center-filter 270, with variable rate signal 255 outputs of narrow frequency; If CD drive adopts the Constant Angular Velocity mode operation, can utilize coupling of switch 390 and bandpass filter 370, with variable rate signal 355 outputs of wideband.That is to say that CD drive can be set the operation frequency domain of multi-mode filter 300 according to the pattern that writes of data, to improve data write speed.
As shown in Figure 4, the circuit block diagram of its expression bandpass filter 370.Bandpass filter 370 can be connected in series by Hi-pass filter 410 and low-pass filter 430, Hi-pass filter 410 can low-frequency component filtering with main beam push-pull signal 250 after, form transition signal 450, and feed-in low-pass filter 430, at this moment, low-pass filter 430 only needs the radio-frequency component filtering with transition signal 450, can be with variable rate signal 355 outputs of wideband.
As shown in Figure 5, it represents that signals such as servo error signal group, bandpass filter frequency range and radio frequency (RF) ensemble are in the distribution scenario of frequency domain in CD drive.So-called servo error signal group 510 is that CD drive is used for compensating the axial and radial beat amount that the disc rotation is caused, and the error signal group who produces, because the beat amount of disc rotation belongs to physical phenomenon, therefore, servo error signal group 510 frequency range is on the low side, below 3KHz, and not with constant linear velocity doubly the increase of speed value increase.On the other hand, by the frequency response 530 of bandpass filter as can be known, the low angular frequency fL of bandpass filter 370 can be designated as M * 22.05KHz, angle of elevation frequency f H then can be designated as M * 55KHz, wherein M be CD drive Constant Angular Velocity nominal doubly a speed value (1 times of fast Constant Angular Velocity inner ring is 1 times of fast constant linear velocity, the about 2.5 times of fast constant linear velocities in outer ring), therefore, no matter CD drive is to write data with several times of speed, only need to extract required variable rate signal according to the corresponding frequency range of adjusting bandpass filter 370 of its times speed value.Recorded data on the disc, be so-called radio frequency (RF) signal, noted down among track, according to the difference of data, also can form many grooves that are uneven in length (pit) and plane (land) in the track, during the laser radiation track, the reflectivity of groove area can be different with plane area, therefore, after the disc rotation, according to catoptrical variation get final product the variation situation of primary data, changed at reflected light signal, can obtain radiofrequency signal group 570.Because radiofrequency signal group 570 frequency is relevant with the rotating speed of disc, therefore, if the doubly speed value of CD drive is different, then radiofrequency signal group 570 frequency range also can change to some extent, for now, radiofrequency signal group 570 frequency is between N * 196KHz to N * 720KHz, and wherein N is the doubly speed value of CD drive constant linear velocity.
Can know by Fig. 5 and to find out, the operation frequency range 530 of bandpass filter is between M * 22.05KHz and M * 55KHz, in comparison, servo error signal group 510 frequency range is then on the low side relatively (3KHz is following), therefore, the influence of 510 pairs of bandpass filter of servo error signal group, 370 extraction variable rate signals is quite limited, bandpass filter with 2 rank is an example, noise restraint to the servo error signal group is-40dB * log (22.05/3)=-34dB, especially after doubly the speed value increases, the operating frequency 530 of bandpass filter 370 can be multiple and improve, but servo error signal group 510 frequency range can not change, high power when speed servo error will make that the noise restraint is higher, so can be ignored fully to the influence of signal.Moreover, the low-limit frequency fRFL of radiofrequency signal can be to N * 196KHz and the angle of elevation frequency f H of bandpass filter 370 is M * 55KHz, the gap of two frequencies is up to 3.56 times, the noise restraint that also can derive 370 pairs of radio frequency ensembles 570 of bandpass filter for-40dB * log (196/55)=-22dB, therefore, radiofrequency signal group 570 will can not interfere with the extraction work of variable rate signal; And when the doubly fast value of constant linear velocity raise, two frequencies were that synchronously multiple rises, so bandpass filter 370 can be possessed identical noise restraint, and can be because of different its functions that influence of doubly fast value.
Compared with prior art, the present invention has following effect:
Disclosed multi-mode filter of the above embodiment of the present invention and method thereof, can effectively suppress variable rate signal signal in addition, and do not need dynamically to adjust the centre frequency of wave filter by foreign frequency, that the present invention has concurrently is functional, the exploitativeness of simplification and height, can meet the demand of the CD drive of a new generation.
Foregoing is to utilize embodiment that technical characterictic of the present invention is described, is not to be used to limit protection scope of the present invention, even there is the people to change slightly on the basis of the present invention's design, must belong in protection scope of the present invention.
Claims (14)
1, a kind of multi-mode filter that is used for CD drive in order to filtering a position error signal, and produces the output signal of tool certain frequency, comprising: a center-filter; It is characterized in that, also comprise: a bandpass filter and a switch;
The input end of center-filter and bandpass filter is connected, and as the input end of filter, the output terminal of center-filter and bandpass filter connects the input end of switch respectively;
Center-filter is in order to filtering this position error signal, and produces a narrow frequency signal;
Bandpass filter is in order to filtering this position error signal, and produces a broadband signal;
Switch is selected one and is coupled between center-filter and bandpass filter, if CD drive adopts the clv mode operation, switch and center-filter couple, with narrow frequency signal output; If CD drive adopts the Constant Angular Velocity mode operation, switch and bandpass filter couple, and broadband signal is exported.
2. multi-mode filter according to claim 1 is characterized in that, described bandpass filter comprises: Chuan Jie a Hi-pass filter and low-pass filter mutually;
Hi-pass filter is in order to filter described position error signal;
Low-pass filter is in order to receive and to filter the signal of Hi-pass filter output.
3. multi-mode filter according to claim 2 is characterized in that, the cutoff frequency of described Hi-pass filter is the integral multiple of 22.05KHz.
4. multi-mode filter according to claim 2 is characterized in that, the cutoff frequency of described low-pass filter is the integral multiple of 55KHz.
5. multi-mode filter according to claim 1 is characterized in that, the centre frequency of described output signal is the integral multiple of 22.05KHz.
6. CD drive that has as any one described multi-mode filter among the claim 1-5.
7. CD drive according to claim 6 is characterized in that, described CD drive is one can write the formula CD drive.
8. CD drive according to claim 7 is characterized in that, the described formula CD drive that writes comprises: CD-R, CD-RW, DVD-R, DVD-RW, DVD+RW, DVD+RAM.
9. the filtering method of a multi-mode filter, in order to handle the position error signal of a CD drive, wherein this multi-mode filter comprises a center-filter, a bandpass filter and a switch, the input end of this center-filter and this bandpass filter is connected, input end as this multi-mode filter, the output terminal of this center-filter and this bandpass filter connects the input end of this switch respectively, and this filtering method may further comprise the steps:
The input position error signal is to this center-filter and this bandpass filter;
Write pattern according to the CD drive data, by this switch, the broadband signal that writes select tape bandpass filter under the pattern in Constant Angular Velocity selects the narrow frequency signal of center-filter as output signal under clv mode as output signal;
Filter this position error signal, and produce an output signal.
10. filtering method according to claim 9 is characterized in that, described bandpass filter comprises: Chuan Jie a Hi-pass filter and low-pass filter mutually;
Hi-pass filter is in order to filter described position error signal;
Low-pass filter is in order to receive and to filter the signal of Hi-pass filter output.
11. filtering method according to claim 10, it is characterized in that, the centre frequency of described center-filter is 22.05KHz, and the cutoff frequency of described Hi-pass filter is that the integral multiple of 22.05KHz and the cutoff frequency of described low-pass filter are the integral multiple of 55KHz.
12. filtering method according to claim 9 is characterized in that, the centre frequency of described output signal is the integral multiple of 22.05KHz.
13. filtering method according to claim 9 is characterized in that, described CD drive is one can write the formula CD drive.
14. filtering method according to claim 13 is characterized in that, the described formula CD drive that writes comprises: CD-R, CD-RW, DVD-R, DVD-RW, DVD+RW, DVD-RAM.
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| CNB011105003A CN1299272C (en) | 2001-04-25 | 2001-04-25 | Multi-mode filter and its filtering method |
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| CNB011105003A CN1299272C (en) | 2001-04-25 | 2001-04-25 | Multi-mode filter and its filtering method |
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| CN1383136A CN1383136A (en) | 2002-12-04 |
| CN1299272C true CN1299272C (en) | 2007-02-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI597723B (en) * | 2016-03-11 | 2017-09-01 | Pei-Yu Liao | Filter CD music pieces noise device |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105515361B (en) * | 2015-11-26 | 2018-07-06 | 深圳市华星光电技术有限公司 | A kind of buffer circuit |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11288554A (en) * | 1998-03-31 | 1999-10-19 | Victor Co Of Japan Ltd | Device and method for recording/reproducing optical disk |
| JPH11317018A (en) * | 1998-04-30 | 1999-11-16 | Toshiba Corp | Disk reproducing device and rf amplifier control circuit |
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2001
- 2001-04-25 CN CNB011105003A patent/CN1299272C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11288554A (en) * | 1998-03-31 | 1999-10-19 | Victor Co Of Japan Ltd | Device and method for recording/reproducing optical disk |
| JPH11317018A (en) * | 1998-04-30 | 1999-11-16 | Toshiba Corp | Disk reproducing device and rf amplifier control circuit |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI597723B (en) * | 2016-03-11 | 2017-09-01 | Pei-Yu Liao | Filter CD music pieces noise device |
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| CN1383136A (en) | 2002-12-04 |
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