CN1277257C - Adaptive level cutting method and apparatus for CD-ROM radio frequency pulse signal - Google Patents
Adaptive level cutting method and apparatus for CD-ROM radio frequency pulse signal Download PDFInfo
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- CN1277257C CN1277257C CN 03156735 CN03156735A CN1277257C CN 1277257 C CN1277257 C CN 1277257C CN 03156735 CN03156735 CN 03156735 CN 03156735 A CN03156735 A CN 03156735A CN 1277257 C CN1277257 C CN 1277257C
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Abstract
The present invention discloses an adaptive electrical level cutting method for a radio-frequency pulse signal of an optical drive, which comprises the following steps: judging whether the radio-frequency pulse signal is under the control of track reading, and low-pass filtering the radio-frequency pulse signal to generate the central electrical level of the radio-frequency pulse signal. The present invention also discloses an adaptive electrical level cutting device for the radio-frequency pulse signal of the optical drive, which comprises an analog-digital converter used for sampling the radio-frequency pulse signal, a digital signal processor connected to the analog-digital converter, and an analog-digital converter connected to the digital signal processor and used for outputting the central electrical level of the radio-frequency pulse. The present invention adds the digital signal processor, and thereby, the adaptive cutting of the center electrical level of the radio-frequency pulse signal is realized, and an accurate radio-frequency zero-cutting signal is generated. The present invention is in favor of a CD to complete the track reading control, short distance track seeking control and the long distance track seeking control when data areas are staggered and no data area is staggered.
Description
Technical field
The present invention relates to a kind of self-adaptive level cutting method of CD-ROM drive radio-frequency (RF) pulse signal; Especially refer to a kind of radio-frequency (RF) pulse signal at CD-ROM drive, the self-adaptation that proposes is cut the method for its centered level.The invention still further relates to a kind of self-adaptive level cutter sweep of CD-ROM drive radio-frequency (RF) pulse signal.
Background technology
In general CD-ROM system, CD-ROM drive herein is meant CD-ROM drive (Compact Disk-Read OnlyMemory drive; CD-ROM drive), or digital multi disc driver (Digital VersatileDisk player DVD player), utilize stepper motor to come drive arrangements that the platform of optical read head is arranged, discs is done the action of reading rail (tracking) and seeking rail (seeking).
Because on discs, have a plurality of tracks (track), in order to record data, so-called to seek rail action promptly be the track that optical read head is moved to the reading of data of wanting.Seek rail and can be divided into that rail (Short Seek) is sought in short distance and long distance is sought rail (Long Seek).Rail is sought in short distance, generally speaking is the rail of seeking below 1000 rails, and the emphasis that rail is sought in short distance is fast, accurate, therefore needs closed loop control.Long distance is sought rail then needs to seek fast rail, and this moment is for opening circuit controls, and in order to keep object lens in the center, reads track brake (Tracking Actuator) and will use errors of centration to control (Central Error Control).Usually long distance all can cooperate short distance accurately once to seek rail arrival location after seeking rail.
Read rail action and be meant that lens do moving of horizontal direction, the track that will read with locking.Afterwards, with the laser radiation discs, the optical sensor of reflected light on optical read head receives, and data-signal and the required original signal of various control on the output discs.
The resulting signal of optical read head can be through prime amplifier complex RF signal (RadioFrequency; RF), and number control signal as: read rail error signal (Tracking Error:TE), radio-frequency (RF) pulse signal (Radio Frequency Ripple; RFRP), read rail error zero and cut signal (Tracking Error Zero Cross; TEZC) and radio frequency zero cut signal (Radio FrequencyZero Cross:RFZC).At present existing CD-ROM drive promptly utilizes radio frequency zero to cut signal and read rail error zero and cut two kinds of signals of signal and produce number trailer system alternately when rail is sought in short distance.
Radio-frequency (RF) pulse signal is to be got by the radiofrequency signal of being read.Radiofrequency signal is that discs reads next data-signal, when the lens alignment track, and the amplitude maximum of radiofrequency signal, and when lens are in the middle of two tracks, the amplitude minimum of radiofrequency signal.Radio-frequency (RF) pulse signal deducts the value of lower envelope line with the value of coenvelope (envelope) line of radiofrequency signal and gets, or radiofrequency signal is got through low-pass filtering.
It is to be got by the radio-frequency (RF) pulse signal of being read that radio frequency zero is cut signal.When the rail action was read in execution, traditional way was with radio-frequency (RF) pulse signal, and as reference centered level (slice level), for example the amplitude null value with the radio-frequency (RF) pulse signal waveform is the reference center level with a fixed value.When the value of radio-frequency (RF) pulse signal greater than this reference center level, then radio frequency zero value of cutting signal is a high level, if the value of radio-frequency (RF) pulse signal less than this reference center level, then radio frequency zero value of cutting signal is a low level.It is to be used for the number rail that radio frequency in the CD-ROM drive zero is cut the signal major function, all can use no matter seek rail control in long and short distance.
Traditional another kind of way is to produce the reference center level by the hardware circuit low-pass filter.Figure 1 shows that conventional hardware low-pass filtering centered level generator, an electric capacity (C) 100, a resistance (R) 102 and a comparer 104 have been comprised, X holds input radio frequency pulse signal (RFRP), and Y holds input reference voltage (Vref), and Z end output radio frequency zero is cut signal (RFZC).Principle of work is with the low-pass filter of radio-frequency (RF) pulse signal through electric capacity 100 and resistance 102 compositions, relends to help comparer 104 and radio-frequency (RF) pulse signal relatively to produce the zero signal of cutting of radio frequency mutually.
Yet, when the staggered situation of data field and non-data regions takes place in discs, there is the resulting radio-frequency (RF) pulse signal amplitude in data field bigger, and it is less at the resulting radio-frequency (RF) pulse signal amplitude of non-data regions, if produce or directly use the mode of reference center level by the hardware circuit low-pass filter with tradition, with making the radio frequency zero that obtains cut distorted signals, seek the rail action problem will take place.
Summary of the invention
Fundamental purpose of the present invention is to provide a kind of self-adaptive level cutting method of CD-ROM drive radio-frequency (RF) pulse signal.
To achieve these goals, the present invention has provided a kind of self-adaptive level cutting method of CD-ROM drive radio-frequency (RF) pulse signal, it provides a digital signal processor, this digital signal processor can be according to a radio-frequency (RF) pulse signal (RFRP), set up a radio-frequency (RF) pulse signal centered level (RFRPCTR), comprise the following step: judge whether to reading under the rail control; When controlling following time reading rail, this radio-frequency (RF) pulse signal is inputed to one first low-pass filter, produce this radio-frequency (RF) pulse signal centered level; When not controlling following time reading rail, this radio-frequency (RF) pulse signal is inputed to one second low-pass filter, produce this radio-frequency (RF) pulse signal centered level, wherein, the frequency range of this second low-pass filter is higher than the frequency range of this first low-pass filter; And this radio-frequency (RF) pulse signal and this radio-frequency (RF) pulse signal centered level inputed to a comparer, this comparer will export the zero signal of cutting of a radio frequency.
The present invention also provides a kind of self-adaptive level cutter sweep of CD-ROM drive radio-frequency (RF) pulse signal, according to a radio-frequency (RF) pulse signal (RFRP), set up a radio-frequency (RF) pulse signal centered level (RFRPCTR), comprise: an analog-digital converter (ADC) (analog to digital converter), this radio frequency heartbeat signals is used for taking a sample; One digital signal processor, connect this analog-digital converter, this digital signal processor comprises one first low-pass filter, reading use under the rail control, and one second low-pass filter, use under the rail control non-reading, wherein, the frequency range of this second low-pass filter is higher than the frequency range of this first low-pass filter; One digital analog converter (DAC) (digital to analog converter) connects this digital signal processor, is used for exporting this radio-frequency (RF) pulse signal centered level; And a comparer, be used to receive the input of this radio-frequency (RF) pulse signal and this radio-frequency (RF) pulse signal centered level, and export a radio frequency zero and cut signal.
Characteristics of the present invention are that the present invention has added a digital signal processor, realize the self-adaptation cutting of the centered level of radio-frequency (RF) pulse signal, produce correct radio frequency zero and cut signal.
Another characteristics of the present invention are the present invention when reading rail control and seeking rail control, use discrepant low-pass filter on the frequency range, make to read rail control and seek rail control and can in time react.
Description of drawings
Fig. 1 is a conventional hardware low-pass filtering centered level generator;
Fig. 2 is the structural drawing of the self-adaptive level cutter of radio-frequency (RF) pulse signal of the present invention;
The digital signal processor architecture figure that Fig. 3 uses for the present invention;
Fig. 4 is radio-frequency (RF) pulse signal of the present invention and radio-frequency (RF) pulse signal centered level contrast figure;
Fig. 5 is the present invention's second low-pass filter update condition synoptic diagram;
The digital signal processor operational flowchart that Fig. 6 uses for the present invention.
Embodiment
Fig. 2 is the structural drawing of the self-adaptive level cutter of radio-frequency (RF) pulse signal of the present invention.Comprised a pre-amplifier 200, one radio-frequency pulse generators 202, in the radio-frequency (RF) pulse signal (RFRP) that X end produces, a comparer 204, an analog-digital converter 206, a digital signal processor 208, an and digital analog converter 210; Y holds input radio frequency pulse signal centered level (RFRPCTR), and Z end output radio frequency zero is cut signal (RFZC).
206 samplings enter processing in the digital signal processor 208 by analog-digital converter with radio-frequency (RF) pulse signal, the gained result delivers to comparer 204 1 by digital to analog converter 210 and brings in as radio-frequency (RF) pulse signal centered level (RFRPCTR), is cutting signal (RFZC) with the mutual contrast generation of radio-frequency (RF) pulse signal (RFRP) radio frequency zero through pre-amplifier 200 and 202 generations of radio-frequency pulse generator.
The digital signal processor architecture figure that Fig. 3 uses for the present invention.One first low-pass filter 300 and one second low-pass filter 302 have been comprised.By A end input radio frequency pulse signal (RFRP), B end output radio-frequency (RF) pulse signal centered level (RFRPCTR).
When reading rail control, radio-frequency (RF) pulse signal through first low-pass filter 300, can get radio-frequency (RF) pulse signal centered level (RFRPCTR) after analog to digital converter 206 samplings, is used for cutting out radio frequency zero and cuts signal, and radio frequency zero is cut signal does not at this moment have special function.But when when seeking rail control, radio frequency zero is cut signal and has been played the part of important role, it not only can have influence on several rail accuracys, also system's incision closed loop stability there is key meaning, digital signal processor 208 can automatically switch according to system state, when reading rail control, can use first low-pass filter 300, when seeking rail, just can cut automatically by needs to second low-pass filter 302, both structures all are the one-level low-pass filters, sampling frequency is 44.1KHz, only variant on frequency range, general second low-pass filter, 302 frequency ranges meeting broad can in time react when being beneficial to seek rail.
Fig. 4 is radio-frequency (RF) pulse signal of the present invention (RFRP) and radio-frequency (RF) pulse signal centered level (RFRPCTR) contrast figure.When rail is sought in short distance, before must being updated to, the original state value of second low-pass filter 302 once seeks the end value that rail finishes, and the original state value of for the first time seeking used second low-pass filter 302 of rail, in the time of then will cutting the closed loop from opening the loop by system moment second low-pass filter, 302 state values.Behind completing jumping, switch to slower first low-pass filter 300 immediately, just unlikelyly finish the back control system and enter in the hysteresis effect seeking rail, radio frequency zero is cut signal and can wrong phase place be produced, and causes the brake minus effect.
Fig. 5 is the present invention's second low-pass filter update condition synoptic diagram.Whether radio-frequency (RF) pulse signal will be upgraded according to sampling frequency 44.1KHz through the value of second low-pass filter when seeking rail, depend on setting speed restriction, be lower than under the speed limit, promptly in a-quadrant and C zone, then the radio-frequency (RF) pulse signal centered level can be upgraded according to half rail flag signals, otherwise, be higher than on the speed limit, promptly then every 44.1KHz upgrades once in the B zone.
See that half rail flag upgrades the benefit of radio-frequency (RF) pulse signal centered level, be to allow it stablely cut out the phase place that accurate radio frequency zero is cut signal, finish to restrain fast to enter the closed loop so that seek rail; When high speed, can not go on the contrary to see half rail flag, need rapid reaction to upgrade the radio-frequency (RF) pulse signal centered level, could in time cut out radio frequency zero like this and cut signal.
The digital signal processor operational flowchart that Fig. 6 uses for the present invention.(S100) at the beginning at first is input radio frequency pulse signal (S102); Then, judge whether to reading under the rail control (S104); If reading then to use first low-pass filter (S106) under the rail control; And then the radio-frequency (RF) pulse signal centered level (S108) under the rail is read in output; Otherwise,, then upgrade earlier and once seek rail done state value (S112) before the second low-pass filter original state value becomes if not reading under the rail control; Use second low-pass filter (S114) then; And store and seek rail done state value, use (S116) for seek rail next time; The radio-frequency (RF) pulse signal centered level (S108) under the rail is sought in output at last; Whole flow process finishes (S110).
The present invention has following effect:
The present invention has added a digital signal processor, so that the centered level of RF pulse signal is certainly suitable Should cut, produce correct radio frequency zero and cut signal.
The present invention uses frequently wide variant low pass filter when reading rail control and seeking rail control, make Must read rail control and seek rail control and can in time react.
Claims (8)
1, a kind of self-adaptive level cutting method of CD-ROM drive radio-frequency (RF) pulse signal is characterized in that, a digital signal processor is provided, and this digital signal processor can be set up a radio-frequency (RF) pulse signal centered level according to a radio-frequency (RF) pulse signal, also comprises the following step:
Judge whether to reading under the rail control;
When controlling following time reading rail, this radio-frequency (RF) pulse signal is inputed to one first low-pass filter, produce this radio-frequency (RF) pulse signal centered level;
When not controlling following time reading rail, this radio-frequency (RF) pulse signal is inputed to one second low-pass filter, produce this radio-frequency (RF) pulse signal centered level, wherein, the frequency range of this second low-pass filter is higher than the frequency range of this first low-pass filter; And
This radio-frequency (RF) pulse signal and this radio-frequency (RF) pulse signal centered level are inputed to a comparer, and this comparer will be exported a radio frequency zero and cut signal.
2, the self-adaptive level cutting method of CD-ROM drive radio-frequency (RF) pulse signal as claimed in claim 1 is characterized in that: this first low-pass filter is an one-level low-pass filter.
3, the self-adaptive level cutting method of CD-ROM drive radio-frequency (RF) pulse signal as claimed in claim 1 is characterized in that: this second low-pass filter is an one-level low-pass filter.
4, the self-adaptive level cutting method of CD-ROM drive radio-frequency (RF) pulse signal as claimed in claim 1 is characterized in that, also comprises the following step:
Once seek rail done state value in the past and upgraded the original state of this second low-pass filter; And
When seeking the rail end, store the done state of this second low-pass filter.
5, the self-adaptive level cutting method of CD-ROM drive radio-frequency (RF) pulse signal as claimed in claim 1 is characterized in that, also comprises the following step:
One setting speed is provided;
When being lower than this setting speed, then this radio-frequency (RF) pulse signal centered level is upgraded according to half rail flag signals; And
When being higher than this setting speed, then this radio-frequency (RF) pulse signal centered level is upgraded according to a sampling frequency of this second low-pass filter.
6, a kind of self-adaptive level cutter sweep of CD-ROM drive radio-frequency (RF) pulse signal according to a radio-frequency (RF) pulse signal, is set up a radio-frequency (RF) pulse signal centered level, wherein comprises:
One analog-digital converter, this radio-frequency (RF) pulse signal is used for taking a sample;
One digital signal processor is connected to this analog-digital converter, and this digital signal processor comprises one first low-pass filter, is reading use under the rail control; And one second low-pass filter, use under the rail control non-reading, wherein, the frequency range of this second low-pass filter is higher than the frequency range of this first low-pass filter;
One digital analog converter is connected to this digital signal processor, is used for exporting this radio-frequency (RF) pulse signal centered level; And
One comparer is used to receive the input of this radio-frequency (RF) pulse signal and this radio-frequency (RF) pulse signal centered level, and exports a radio frequency zero and cut signal.
7, the self-adaptive level cutter sweep of CD-ROM drive radio-frequency (RF) pulse signal as claimed in claim 6 is characterized in that: this first low-pass filter is an one-level low-pass filter.
8, the self-adaptive level cutter sweep of CD-ROM drive radio-frequency (RF) pulse signal as claimed in claim 6 is characterized in that: this second low-pass filter is an one-level low-pass filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03156735 CN1277257C (en) | 2003-09-08 | 2003-09-08 | Adaptive level cutting method and apparatus for CD-ROM radio frequency pulse signal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03156735 CN1277257C (en) | 2003-09-08 | 2003-09-08 | Adaptive level cutting method and apparatus for CD-ROM radio frequency pulse signal |
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| Publication Number | Publication Date |
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| CN1595508A CN1595508A (en) | 2005-03-16 |
| CN1277257C true CN1277257C (en) | 2006-09-27 |
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| CN 03156735 Expired - Fee Related CN1277257C (en) | 2003-09-08 | 2003-09-08 | Adaptive level cutting method and apparatus for CD-ROM radio frequency pulse signal |
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Owner name: MEDIATEK INC. Free format text: FORMER OWNER: YANGZHI SCIENCE + TECHNOLOGY CO. LTD. Effective date: 20050429 |
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Effective date of registration: 20050429 Address after: Hsinchu, Taiwan Province Applicant after: MediaTek.Inc Address before: Taipei city of Taiwan Province Applicant before: Yangzhi Science & Technology Co., Ltd. |
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