CN1321407C - Automatic detecting device for preetched bumper signal - Google Patents
Automatic detecting device for preetched bumper signal Download PDFInfo
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- CN1321407C CN1321407C CNB031497217A CN03149721A CN1321407C CN 1321407 C CN1321407 C CN 1321407C CN B031497217 A CNB031497217 A CN B031497217A CN 03149721 A CN03149721 A CN 03149721A CN 1321407 C CN1321407 C CN 1321407C
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- signal
- preetched
- bumper
- window
- accurate position
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Abstract
The present invention relates to an automatic detecting device for the signal of a pre-etched convex track. The present invention uses a well-known technique to adjust the aspect of push-pull signal gain so as to enhance the signal-to-noise ratio (SNR) of the signal of the pre-etched convex track to a wobble phenomenon. The present invention discriminates the actual position of the signal of the pre-etched convex track by digital logic; besides, an automatic slice level formed by combining the use of the level automatic detection and the fixed slice level of an RC circuit is used as the basis of judging the pre-etched convex track so as to overcome the defect of difficult obtainment of the correct slice signal of the pre-etched convex track in a disc with already recorded data by using a fixed slice level technique for the pre-etched convex track in the well-known technique.
Description
Technical field
The present invention is a kind of automatic detection device as Video CD preetched bumper signal, be utilize " recommending " (push-pull) adjustment of signal gain improve the signal to noise ratio (S/N ratio) of preetched bumper signal to wig-wag signal, and the utilization Digital Logic is told the physical location of preetched bumper signal, reach with the accurate position of automatic cutting that the accurate position of RC circuit is surveyed automatically and fixing cutting accurate position merging uses the back to be formed, as the foundation of preetched bumper judgement.
Background technology
The writable type Video CD (write-onceDVD of Video CD in the existing technology (DVD), DVD-R) or erasable type Video CD (re-writable DVD, DVD-RW) identical structure is arranged, wherein on the preetched bumper on the disc track (LPP) position, include burning laser (laser) wavelength, disc recording power, recording strategy, disc manufacturer, with information such as disk location.See also Video CD sheet data track (track) synoptic diagram of known technology shown in Figure 1A, it shown in the figure relation of waving phenomenon (wobble) and preetched bumper (LPP), preetched bumper district 15 on figure actual as can be known blank writable type Video CD (DVD-R) or erasable type Video CD (DVD-RW) discs is the crest places that are engraved in groove face 17 with respect to (wobble) 13 that wave the position thus, and trench area (groove) 11 and groove face (land) 17 interlaced arrangement on data track, when disc after data on trench area 11 record, writing a data mark (mark) 12 near the pre-preetched bumper district 15 of carving on the groove face 17, the data that its result is shown as known technology shown in Figure 1B write synoptic diagram, wherein the groove face 17 in each preetched bumper district 15 is discontinuous, produce the boundary effect of thermal diffusion when causing writing data, promptly can be diffused into preetched bumper district 15 at trench area 11 recorded data marks 12 places, and the preetched bumper signal is affected, allow preetched bumper signal originally after writing data, its oscillator intensity can cause signal to noise ratio (S/N ratio) to reduce with respect to wig-wag signal (wobble signal) atrophy.
Known technology Fig. 2 A is depicted as before the Video CD burning for another example, the preetched bumper signal is write the waveform A that data influence, this moment is if utilize the fixing preetched bumper accurate position of cutting (LPPSlice Level), shown in the dotted line of figure, this fixing preetched bumper cut accurate potential energy enough by comparer correct cut out digital preetched bumper signal.Shown in waveform synoptic diagram after Fig. 2 B burning, the acquisition regular meeting of general preetched bumper signal utilizes (push-pull) mode of recommending to produce, and the preetched bumper cutoff signal is taken out, as waveform A in the accurate position of preetched bumper cutting of the fixing accurate bit-type of collocation then.But after writing data, cause the preetched bumper signal amplitude intensity can be many with respect to wig-wag signal (wobble signal) atrophy, as waveform B in the icon, this moment is if use fixing accurate position cutting then can cause the not high problem of preetched bumper cutoff signal correctness, make at process error-correcting code (Error CorrectingCode, ECC) after the protection, still cause preetched bumper signal accuracy on the low side, this will influence CD-ROM drive track import information (lead-in information) read and seek rail (track jump) time address date read; And when same disc follows rail (track-following), it is also inconsistent to the characteristic of outer ring by inner ring to can be observed the preetched bumper signal, add influence or the difference between the different disc that writes data and write indegree, the capital causes the accuracy of preetched bumper cutoff signal to descend, therefore, be necessary to design an accurate automatically position and adjust mechanism, in the hope of under different condition, can both correctly finding the preetched bumper cutoff signal.
Fig. 3 is a known technology preetched bumper cutoff signal generation method circuit diagram, circuit is to utilize fixing preetched bumper cutting accurate position V1 and preetched bumper signal V2, in comparer 31, make comparisons and obtain preetched bumper cutoff signal V12, this signal makes it and waves clock pulse (wobble clock) signal V3 work synchronously via the noise gateway circuit (noisegate) 33 in the circuit again, in order to eliminate the comparer 31 unnecessary impulse disturbances that produces (glitch), and will be sent in the preetched bumper decoding scheme 35 through filtered preetched bumper cutoff signal V4.The confidence level of the preetched bumper cutoff signal of the method before the DVD discs does not write data well, but after writing data, be subjected to high frequency (RF) effect of signals of data, cause the preetched bumper signal amplitude intensity can be with respect to wig-wag signal (wobble signal) atrophy, this moment, the confidence level of preetched bumper cutoff signal just becomes very poor.
See also the accurate position of Fig. 4 known technology correction preetched bumper cutting circuit diagram, known improvement is the way of the accurate position of preetched bumper cutting fixedly, it is to utilize preetched bumper signal V2 through position limiter (level limiter) 41 and bandpass filter (BPF) 43 filtered signals reach the accurate position of correction cutting purpose surely, this signal combines with a preetched bumper cutting accurate position V1 who fixes and does computing and deliver to comparer 31, make comparisons with preetched bumper signal V2 and to obtain preetched bumper cutoff signal V12, again via the noise gateway circuit 33 in the circuit, make it and to wave clock pulse (wobble clock) signal V3 synchronous, eliminate the comparer 31 unnecessary impulse disturbances that produces.Produce the preetched bumper cutoff signal V4 of protection through above-mentioned processing after; be sent at last in the preetched bumper decoding scheme 35; but this still can be subjected to the influence of contiguous preetched bumper; cause the accurate position of bandpass filter 43 filtered cuttings correction deficiency; cause the phenomenon of erroneous judgement preetched bumper, make the accuracy of preetched bumper cutoff signal promote few.
The technology that the present invention uses a kind of preetched bumper signal to survey is automatically surveyed the variation of wig-wag signal (wobble signal), remedy the deficiency of conventional fixed formula preetched bumper cutoff signal, and the cooperation digital logical operation, in order to improve the accuracy of preetched bumper cutoff signal.
Summary of the invention
The present invention is a kind of preetched bumper signal automatic detection device, preetched bumper (landpre-pit wherein, LPP) automatically the accurate position of cutting (auto slice level) technology mainly is in order to overcome when writing data on groove (groove), the thermal diffusion that the preetched bumper signal of this place's groove face (land) can be write data influences, the oscillator intensity that causes having write back preetched bumper signal dies down, and therefore adopts the accurate position of fixed preetched bumper cutting technology will be difficult for accurately cutting to the preetched bumper signal.The present invention is for overcoming this problem, except utilizing known technology to " recommending " (push-pull) the special adjustment of signal gain do, to improve signal to noise ratio (S/N ratio) (the Signal to NoiseRatio of preetched bumper signal to wig-wag signal (wobble signal), SNR), and the utilization Digital Logic is told outside the physical location of preetched bumper signal, and the accurate position of the automatic cutting that accurate position is surveyed automatically and the fixing accurate position of cutting (slice level) merging uses the back to be formed of the RC circuit of arranging in pairs or groups, as the foundation of preetched bumper judgement.The method has comprised and has write the influence factor of data to wig-wag signal (wobble signal), therefore significantly reduce and cut out wrong digital preetched bumper signal, use the accurate position of fixed preetched bumper cutting technology in the located by prior art thereby improve, be difficult in the recorded data disc, obtaining the disappearance of correct preetched bumper cutoff signal.
Description of drawings
Figure 1A is the recordable type Video CD sheet data track format synoptic diagram of known technology;
Figure 1B writes synoptic diagram for the data of known technology;
Fig. 2 A is the waveform synoptic diagram of preetched bumper signal before the burning of recordable type Video CD;
Fig. 2 B is the waveform synoptic diagram of preetched bumper signal after the burning of recordable type Video CD;
Fig. 3 is the circuit diagram of the preetched bumper cutoff signal generation method of known technology;
Fig. 4 is the accurate position of the correction preetched bumper cutting circuit diagram of known technology;
Fig. 5 is a recordable type Video CD sheet data-track synoptic diagram;
Fig. 6 surveys the signal graph of the accurate position of cutting automatically for embodiment of the invention preetched bumper signal;
The circuit diagram of Fig. 7 accurate position sniffer for embodiment of the invention preetched bumper signal cuts automatically.
Among the figure
11 ... trench area 12 ... data markers
13 ... wave position 15 ... the preetched bumper district
17 ... groove face A ... preetched bumper signal waveform before the disc record
B ... preetched bumper signal waveform behind the disc record
V1 ... preetched bumper cutting accurate position V2 ... the preetched bumper signal
V3 ... wave clock signal V12 ... the preetched bumper cutoff signal
V4 ... preetched bumper cutoff signal 31 after the filtering ... comparer
33 ... noise gateway circuit 35 ... the preetched bumper decoding scheme
41 ... accurate position limiter 43 ... bandpass filter
51 ... trench area 55 ... the preetched bumper district
57 ... groove face A ... preetched bumper signal (LPP signal)
B ... preetched bumper cutoff signal (LPP sliced signal)
C ... preetched bumper guard signal (LPP protect signal)
D ... wave clock signal (wobble clock signal)
E ... preetched bumper window signal (LPP window signal)
F ... preetched bumper bottom signal (bottom hold signal)
G ... sampling value preserving signal (sample﹠amp; Hold signal)
H ... accurate position value preserving signal (hold level signal)
I ... accurate position cutoff signal (sliced level signal)
V1 ... fixedly the preetched bumper cutting is accurate
600 ... optical read/write head circuit 601 ... optical read/write head
602 ... phase-locked loop 603 ... spindle motor controller
604 ... Spindle Motor 605 ... gain balancer
606 ... gain weighter 607 ... comparer
608 ... analog operating unit 609 ... the bottom signal generator
610 ... sampled signal position generator 611 ... the synchronizing signal corrector
612 ... preetched bumper window signal generator 613 ... the preetched bumper code translator
60 ... digital processing unit 61 ... first signal
62 ... secondary signal 63 ... the 3rd signal
64 ... the 4th signal 65 ... the 5th signal
Embodiment
Fig. 5 is a recordable type Video CD sheet data track format synoptic diagram, it shown in the figure relation of wig-wag signal (wobble signal) and preetched bumper (LPP), preetched bumper district 55 on the wherein actual blank recordable type Video CD sheet is the crest places of waving position (wobble) that are engraved in the groove face district 57, and trench area (groove) 51 and groove face (land) 57 interlaced arrangement on the data track of discs.For with the preetched bumper signal by taking out in the groove face district 57, use the mode of recommending (push-pull) to take out signal, and the proper proportion adjustment done in the gain of push-pull signal, to promote the signal to noise ratio (S/N ratio) of preetched bumper the wig-wag signal of trench area 51.
In order to promote digital preetched bumper signal data correctness, the present invention proposes two kinds of implementation methods.See also Fig. 6 embodiment of the invention preetched bumper signal and survey the signal graph of the accurate position of cutting automatically, with the digital processing aspect, read a preetched bumper signal A by the optical read/write head of recordable type Video CD, in order to obtain the position of preetched bumper (LPP), promptly utilize DLC (digital logic circuit) to waving clock pulse (wobble clock) counting, it waves the clock signal waveform can be with reference to " D " in the icon, and learn by the Video CD specifications that two adjacent preetched bumpers (LPP) are separated by 8 at least and wave clock pulse (wobble clock), therefore according to waving clock pulse this preetched bumper signal A is cut into several sections, contain 8 in each section and wave clock signal, preceding 3 are waved clock signal and may contain the preetched bumper signal, 5 of backs are waved clock signal and are not contained the preetched bumper signal, therefore we can produce prediction preetched bumper window (LPP window) signal E in addition, this preetched bumper window signal E is according to waving clock signal D, generation open 3 with close 5 signal with as RC impedance switching sequence, promptly, first three is waved clock pulse makes quick RC to a-signal and discharges and recharges processing, then five are waved clock pulse and do at a slow speed to a-signal that RC discharges and recharges, to produce the bottom signal F of icon.Window (window) the acquisition bottom signal F that is left by sampling value preserving signal G can obtain accurate position value preserving signal H as shown in the figure again.
Must do synchronously with waving clock signal D after capturing digital preetched bumper cutoff signal (LPP-sliced signal) B, to obtain preetched bumper guard signal (LPP-protect signal), as the signal of icon C.So just can obtain correct preetched bumper position, and unnecessary impulse disturbances (glitch) signal can be eliminated, carry out the detection and correction (the LPPError Code Detection﹠amp of preetched bumper error-correcting code then; Correction) obtain correct preetched bumper message.
The present invention uses the framework of a cutting standard automatically position (auto slice level) aspect simulation process, at first is to utilize target sampling of Fig. 6 institute and value preserving trigger pip (Sample﹠amp; Hold signal) there be not the preetched bumper part to do the sampling value preserving of preetched bumper bottom signal (LPP bottom signal), and we utilize principle that RC discharges and recharges that the accurate position of preetched bumper bottom signal is recorded in the electric capacity, we are to use the sampling value preserving than signal at the bottom of the RC circuit of resistance is made preetched bumper greatly in this process, and purpose is to obtain stable bottom (bottom) signal level.Yet when the preetched bumper position is arranged, the accurate position of the bottom signal that we utilize previous sampling to preserve is done the mimic channel computing with the accurate position of the fixing cutting of setting and is obtained accurate position cutoff signal, utilizes this accurate position to see through comparer with preetched bumper signal A and obtains digital preetched bumper signal B.In order to prevent that bottom stable in the RC circuit (bottom) signal level is subjected to the influence of preetched bumper signal, therefore be with the resistance decreasing of RC circuit in the process of high levle at preetched bumper window (LPP window) signal, in the hope of changing fast, avoid bottom signal to be subjected to the influence of preetched bumper signal, so preetched bumper bottom signal F shown in Figure 6 is can acute variation in the process of high levle at preetched bumper window (LPP window) signal E.Influence after such method can influence wig-wag signal the amplitude variations that is produced and write data because of adjacent rail, producing the accurate position of suitable cutting by preetched bumper signal level automatic detection device eliminates, avoid comparer to produce wrong digital preetched bumper signal, significantly promote the data accuracy.
Fig. 7 is an embodiment of the invention preetched bumper signal level automatic detection device circuit diagram, below for this reason circuit contrast above-mentioned each signal circuit shown in Figure 6 and connect:
Optical read/write head 601 in the optical read/write head circuit 600 of one recordable type digital laser video disk machine reads the numerical data on the CD, wherein secondary signal 62 obtains the 4th signal 64 through a gain balancer (gainbalance) 605, make its signal amplitude size identical with first signal 61, first signal 61 and the 4th signal 64 utilize push pull mode to produce the 3rd signal 63 then.The 3rd signal 63 is sent to a spindle motor controller 603 by phase-locked loop (wobble PLL) 602 again, thus the Spindle Motor 604 in the control CD-ROM drive, and this signal controlling is a technique known, is not described in detail in this.
The 4th signal 64 is connected to gain weighter 606 and produces the 5th signal 65, thereby first signal 61 and the 5th signal 65 that optical read/write head 601 obtains are adjusted to a certain multiplying power to promote the signal to noise ratio (S/N ratio) of preetched bumper signal (LPP) with respect to wig-wag signal (wobble signal), and obtaining preetched bumper signal A with 61 additions of first signal, this preetched bumper signal A is sent to a comparer 607 and a bottom signal generator 609 respectively.Bottom signal generator 609 is by preetched bumper signal A and the preetched bumper window signal E generation preetched bumper bottom signal F as shown in Figure 6 that is transmitted by digital processing unit 60, sampled signal generator 610 receives this preetched bumper bottom signal F and obtains an accurate position value preserving signal H with the sampled signal G that is transmitted by digital processing unit 60, this accurate position value preserving signal H is sent to an analog operating unit 608, the fixedly preetched bumper cutoff signal V1 that produces with a fixed voltage deals with, and the computing that utilizes this analog operating unit 608 is to obtain accurate position cutoff signal (the sliced level signal) I of preetched bumper.
Comparer 607 receives by read/write head and transmits preetched bumper signal A after gain balancer 605 and gain weighter 606 grades are handled, and receives the accurate position cutoff signal I that obtained by analog operating unit 608 and obtain as shown in Figure 6 preetched bumper cutoff signal B after relatively.
Aforesaid bottom signal generator 609 and sampled signal generator 610 obtain preetched bumper window signal E and sampled signal G to produce accurate cutoff signal H by digital processing unit 60 respectively.
Aforesaid digital processing unit 60 includes a synchronous signal calibrator 611, preetched bumper window signal generator 612, reaches preetched bumper code translator 613.Synchronizing signal corrector 611 receives by the preetched bumper cutoff signal B after comparer 607 processing, and the clock signal D that waves that is transmitted with phase-locked loop 602 does the synchronous correction processing; Preetched bumper window signal generator 612 receives from what phase-locked loop 602 produced and fixedly waves clock signal D, and with this with reference to generation open 3 with the signal waveform of closing 5, preetched bumper window signal E promptly shown in Figure 6.This preetched bumper window signal E be the preetched bumper signal C that produces after (AND) logical operation after the protection via synchronizing signal corrector 611 synchronous processing preetched bumper signal later; Preetched bumper code translator 613, then the preetched bumper signal C that receives after protecting does the decoding of preetched bumper to obtain the object of the invention preetched bumper information.
The accurate position of cutting that is produced by above-mentioned bottom signal generator 609 and sampled signal generator 610, obtain the accurate position of automatic adjustment cutting of preetched bumper via analog operating unit 608, after the processing of comparer 607 and synchronizing signal corrector 611 and preetched bumper window signal generator 612, obtain preetched bumper position signalling C again, obtain correct preetched bumper information by preetched bumper code translator 613 at last, to improve data correctness.
The technology that preetched bumper signal level automatic detection device of the present invention uses a kind of preetched bumper signal level to survey is automatically surveyed the variation of wig-wag signal (wobble signal), to remedy the deficiency of conventional fixed formula preetched bumper cutoff signal, and cooperate digital logical operation to improve the correctness of digital preetched bumper signal, get rid of unnecessary impulse disturbances, so can will cause the error rate of preetched bumper signal interpretation significantly to reduce because of preetched bumper cutoff signal mistake.
In sum, preetched bumper signal level automatic detection device of the present invention has progressive on effect, add easy realization and advantage cheaply, the value that has industry, and be present new invention not seen before on the market, the important document of getting permission that meets patent of invention fully is so file an application in accordance with the law.
But the above person only is preferred embodiment of the present invention, when can not be as implementing restriction of the present invention.That is, every equalization of being done according to the present patent application claim changes and modifies, and all should still belong to claim of the present invention and contain.
Claims (6)
1. preetched bumper signal level automatic detection device, it is characterized in that: use a digital processing unit to tell the physical location of preetched bumper signal, and the accurate position of automatic cutting that the accurate position that utilizes the RC circuit is surveyed automatically and fixing cutting accurate position merging uses the back to be formed, as the foundation that preetched bumper is judged, this device includes:
One bottom signal generator is connected in an optical read/write head circuit, and receives a preetched bumper signal and a preetched bumper window signal, and produces a preetched bumper bottom signal;
One sampled signal generator, it connects this bottom signal generator, and receives this a preetched bumper bottom signal and a sampling value preserving signal, and produces position value preserving signal surely;
One analog operating unit, it connects this sampled signal generator, and receives this standard position value preserving signal and the accurate position of a fixing cutting, after the simulation signed magnitude arithmetic(al), and produces position cutoff signal surely;
One comparer, it connects this analog operating unit and this optical read/write head circuit, and receives this preetched bumper signal and this standard position cutoff signal, and produces a preetched bumper cutoff signal; And
One digital processing unit, it connects this comparer, and this a preetched bumper cutoff signal of reception and a clock signal that waves by the phase-locked loop generation, and producing this preetched bumper window signal and this sampling value preserving signal, this digital processing unit includes a synchronous signal calibrator, a preetched bumper window signal generator and a preetched bumper code translator.
2. preetched bumper signal level automatic detection device as claimed in claim 1, wherein, a phase-locked loop produces this and waves clock signal, and in order to connect this preetched bumper window signal generator and synchronizing signal corrector.
3. preetched bumper signal level automatic detection device as claimed in claim 1, wherein, this digital processing unit connects this comparer, this phase-locked loop, this bottom signal generator and this sampled signal generator.
4. preetched bumper signal level automatic detection device as claimed in claim 1, wherein, this preetched bumper window signal is a kind of signal of opening 3 passes 5.
5. preetched bumper signal level automatic detection device as claimed in claim 1, wherein, this synchronizing signal corrector and preetched bumper window signal generator are synthetic to produce a preetched bumper guard signal, and is connected to this preetched bumper code translator.
6. preetched bumper signal level automatic detection device as claimed in claim 1, wherein, this preetched bumper window signal generator produces this preetched bumper window signal, and in order to connect this preetched bumper code translator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031497217A CN1321407C (en) | 2003-08-06 | 2003-08-06 | Automatic detecting device for preetched bumper signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031497217A CN1321407C (en) | 2003-08-06 | 2003-08-06 | Automatic detecting device for preetched bumper signal |
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| Publication Number | Publication Date |
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| CN1581310A CN1581310A (en) | 2005-02-16 |
| CN1321407C true CN1321407C (en) | 2007-06-13 |
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| CNB031497217A Expired - Fee Related CN1321407C (en) | 2003-08-06 | 2003-08-06 | Automatic detecting device for preetched bumper signal |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US10778482B2 (en) * | 2019-02-12 | 2020-09-15 | Texas Instruments Incorporated | Bit slicer circuit for S-FSK receiver, integrated circuit, and method associated therewith |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001045096A1 (en) * | 1999-12-15 | 2001-06-21 | Koninklijke Philips Electronics N.V. | Optical record carrier and scanning device |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001045096A1 (en) * | 1999-12-15 | 2001-06-21 | Koninklijke Philips Electronics N.V. | Optical record carrier and scanning device |
| CN1346489A (en) * | 1999-12-15 | 2002-04-24 | 皇家菲利浦电子有限公司 | Optical record carrier and scanning device |
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| CN1581310A (en) | 2005-02-16 |
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