CN1306502C - Producing method and device of signal marking forming efficiency - Google Patents
Producing method and device of signal marking forming efficiency Download PDFInfo
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- CN1306502C CN1306502C CNB021323674A CN02132367A CN1306502C CN 1306502 C CN1306502 C CN 1306502C CN B021323674 A CNB021323674 A CN B021323674A CN 02132367 A CN02132367 A CN 02132367A CN 1306502 C CN1306502 C CN 1306502C
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- optical recording
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Abstract
The present invention relates to a producing method and a device for marking to form an effectiveness signal, which is applied to optical recording systems which can provide a light incidence write signal so as to form a readable mark on an optical recording media. A reflection write signal of the light incidence write signal is detected and sampled by using a peak detector and at least one sample-and-hold circuit to obtain a peak value and an amplitude level of the reflection write signal. After the peak value and the amplitude level are digitized, a mark is generated by an arithmetic circuit to form an effectiveness signal. Thus, the effectiveness signal is formed according to the mark to control the optical recording system to output optimum laser power.
Description
Technical field
The present invention forms usefulness signal generating method and device thereof relevant for a kind of mark, be meant that especially a kind of mark that can produce accurately forms the usefulness signal during the record of optical recording system, be used to control this optical recording system output optimal laser power and the method and the device thereof that can on optical recording media, produce the best titime quality.
Background technology
Light source in the optical recording system, normally penetrate by the laser and/write head, can be subjected to send laser by the driving circuit driving of write control signal control, and produce light incident write signal with at the optical recording media identifying recording layer, therefore in order to ensure data by record correctly, it is very important that laser output is maintained a suitable power level.General normal use best power control (OPC) technology decides the laser power of initial incident write signal, it is at first with the optical recording medium, for example the section of CD-R is as the usefulness of optical power calibration test, and on this section, use a series of laser power to carry out some exercise records, then these exercise records are read, from these records, selecting generation and preferably write down the power level of the Writing power level of quality, and write signal power level with this best and on other section of this CD, carry out the real data record as the incident write signal of the best.Yet, in most optical recording system, because all variables of optical recording system and CD, the for example variation in thickness of the record dye layer of optical recording media and substrate birefringence, because the laser length offset causes the change of measuring point, temperature and disc slope, defocus, problems such as derailing and location, the power level of this best write signal is affected and can keep fixing, so that when write signal power too hour, information possibly can't be by complete documentation, and if write signal power is too big, then can when recorded information, cause serious consequence or the influence that for example destroys recording track again.Therefore, for addressing the above problem, a kind of laser power control method has been proposed.As shown in Figure 1, a kind of optical recording system 1 that it is depicted as that No. 5216660 patent of the U.S. disclose, it has: LASER Light Source 10, it can provide light incident write signal with recorded information on optical recording media 3, and this light incident write signal is to be produced by write control signal control Driver Circuit driving laser read/write head; And photodetector 11, in order to detect the signal of this light incident write signal via reflection on the optical recording media 3, and obtain reflection write signal (reflected write pulse, hereinafter to be referred as the WRF signal), and this WRF signal sent into first sample-and-hold circuit 12 respectively and second sample-and-hold circuit 13 is taken a sample.And cooperate shown in Figure 2ly, timing sequence generating circuit 14 produces first timing and second timing respectively, to control the sampling time point t of first sample-and-hold circuit 12 and second sample-and-hold circuit 13
AAnd t
B, with first level (being the peak value of the WRF signal) V that obtains this WRF signal respectively
AAnd one second level V
B, then with the first level V
AWith the second level V
BAfter an analog/digital converter 15,16 carries out digitizing, send in the signal processor 17 and carry out calculation process, and produce a V respectively
A/ (V
A-V
B) value, and should be worth V
A/ (V
A-V
B) with a desired value after for example a subtracts each other, the error amount after subtracting each other with this is controlled this laser drive circuit 18 and is driven these LASER Light Source 10, when making output power when this LASER Light Source 10 for example reach the b value, this V
A/ (V
A-V
B) can equal this desired value a, as shown in Figure 3, thereby reach the purpose that control LASER Light Source 10 is exported optimal laser powers.
Yet but there is following shortcoming in above-mentioned technology:
1. prior art is carried out peak sample with 12 pairs of these WRF signals of this first sample-and-hold circuit, but learn by practical experience, position and on-fixed appear in the peak value of this WRF signal, but can be along with the variable of discs, the for example record dye layer variation in thickness of discs and substrate birefringence or discs inclination etc. and change, yet because of the sampling time point of first sample-and-hold circuit 12 is fixing, and the peak value time of occurrence of WRF signal is very of short duration and rapid, therefore is difficult for accurately obtaining with a sample-and-hold circuit peak value of this WRF signal.
2. because first and second sample-and-hold circuit the 12, the 13rd of prior art uses analog/digital converter 15,16 respectively, so that when increasing sample-and-hold circuit when needs increase sampling spot, the quantity of this analog/digital converter also needs along with increase, not only increase manufacturing cost, and make integrated circuit become complicated.
Summary of the invention
Therefore, fundamental purpose of the present invention is to provide a kind of mark to form usefulness signal generating method and device thereof, is used for by producing the best laser power of this optical recording system output of the usefulness of mark formation accurately signal controlling.
So, the invention provides a kind of mark and form the usefulness signal generating method, this method is applied in the optical recording system, and this optical recording system has: LASER Light Source, it provides light incident write signal to can read mark to form on optical recording media; And photodetector, in order to detect the reflection write signal of this light incident write signal from this optical recording media reflection.This method comprises: detect a peak value of this reflection write signal and this reflection write signal of taking a sample, to obtain at least one amplitude level.This peak value and this amplitude level calculate to produce a mark according to the MFE computing formula and form the usefulness signal, and this mark on forming usefulness signal and being formed on this optical recording media to can read mark corresponding.By this, can form the best laser power of this LASER Light Source output of usefulness signal controlling according to this mark.
Therefore, realize that the mark formation usefulness signal generation device of said method of the present invention is applied in the optical recording system, this optical recording system has: LASER Light Source, and it provides light incident write signal to can read mark to form on optical recording media; And photodetector, in order to detect the reflection write signal of this light incident write signal from this optical recording media reflection.This mark forms the usefulness signal generation device and comprises simulated peak detecting device, at least one sampling/holding circuit and computing circuit.This simulated peak detecting device is in order to detect this reflection write signal and to obtain a peak value of this reflection write signal.This sampling/holding circuit is in order to obtain the amplitude level of this reflection write signal.The above-mentioned peak value of this computing circuit and amplitude level calculate to produce mark according to the MFE computing formula and form the usefulness signal, and this mark on forming usefulness signal and being formed on this optical recording media to can read mark corresponding.By this, can form the best laser power of this LASER Light Source output of usefulness signal controlling according to this mark.
Description of drawings
Further feature of the present invention and advantage, in following cooperation DETAILED DESCRIPTION OF THE PREFERRED with reference to the accompanying drawings, it is clearer to become, in the drawings:
Fig. 1 is the summary circuit block diagram of existing a kind of optical recording system;
Fig. 2 is existing timing figure to this reflection write signal sampling;
Fig. 3 shows the recording characteristic of an optical recording media;
Fig. 4 is that the present invention uses mark to form the circuit block diagram of the optical recording system of usefulness signal generation device;
Fig. 5 is the detailed circuit calcspar that this mark forms the usefulness signal generation device in this preferred embodiment; And
The mark of Fig. 6 displayed map 5 forms in the usefulness signal generation device, the waveform of RLC signal, IRL signal, WRF signal, and the gating pulse sequential chart of the action pulse sequential chart of this simulated peak detecting device and first and second sample-and-hold circuit and this multiplexer.
Embodiment
At first, consult shown in Figure 4, it is depicted as the circuit block diagram that mark of the present invention forms a preferred embodiment of usefulness signal generating method and device thereof, this mark forms the usefulness signal generating method and device is applied in the optical recording system, therefore, in the present embodiment, this optical recording system 2 comprises that LASER Light Source 21, the laser drive circuit 22 in order to drive this LASER Light Source 21, photodetector 23, timing sequence generating circuit 24 and mark of the present invention form usefulness signal generation device 4.Wherein this LASER Light Source 21 is a laser diode, it provides light incident write signal (incident recording light signal, hereinafter to be referred as the IRL signal), can read mark (mark) go up to form, and the data recording that desire is stored is on this optical recording media 3 at optical recording media 3 (for example discs).And cooperate shown in Figure 6, this timing sequence generating circuit 24 provides and writes laser control signal (recording laser control signal, hereinafter to be referred as the RLC signal) and write clock signal RTS, this RLC signal is in order to control laser drive circuit 22, make driving laser light source 21 produce this IRL signal, with recorded information on optical recording media 3.And photodetector 23 is arranged on the IRL signal of optical recording system 2 from the reflection paths of optical recording media 3 reflections, in order to detect this IRL signal and to obtain reflection write signal (the reflected writepulse of this IRL signal, hereinafter to be referred as the WRF signal), and include corresponding to this reflection that is recorded the part of data in this WRF signal and write pulse.And this mark forms usefulness signal (mark formationeffectiveness, hereinafter to be referred as MFE) generation device 4 is connected with photodetector 23, form usefulness (mark formation effectiveness to produce mark according to this WRF signal, hereinafter to be referred as MFE) signal, and this MFE signal be formed on optical recording media 3 on to can read mark corresponding.As shown in Figure 5, MFE signal generation device 4 mainly includes sampling/maintenance timing sequence generating circuit 41, simulated peak detecting device 42, the first sampling/holding circuit 43, the second sampling/holding circuit 44, multiplexer 45, analog/digital converter 46 and computing circuit 47.Wherein, sampling/maintenance timing sequence generating circuit 41 is connected with timing sequence generating circuit 24, simulated peak detecting device 42, the first sampling/holding circuit 43 and the second sampling/holding circuit 44 respectively.Simulated peak detecting device 42, the first sampling/holding circuit 43 and the second sampling/holding circuit 44 also are connected with analog/digital converter 46 via multiplexer 45 except being connected with photodetector 23 respectively.And mark of the present invention forms the usefulness signal generating method and comprises the following steps:
At first, carry out peak value detection and sampling with simulated peak detecting device 42 and 43,44 pairs of these WRF signals of first and second sampling/holding circuit, with peak value and two different amplitude levels of obtaining the WRF signal.And in order to control the action of simulated peak detecting device 42 and first and second sampling/holding circuit 43,44, sampling/maintenance timing sequence generating circuit 41 is connected with above-mentioned timing sequence generating circuit 24, produce the peak detection signal PKA_RST of control simulated peak detecting device 42 actions and control first and second sample-pulse signal SH_B and the SH_C that first and second sample-and-hold circuit 43,44 is taken a sample in order to the clock signal RTS that writes that provides with timing sequence generating circuit 24, and the waveform of these signals PKA_RST, SH_B and SH_C as shown in Figure 6.Therefore, as shown in Figure 6, in the time must on CD, forming mark, write timing sequence generating circuit 24 and the RLC signal can be made as Hi (height), make LASER Light Source 21 produce an IRL signal synchronously, and output simultaneously writes the first pulse P1 of clock signal RTS, and leading RLC signal of this first pulse P1 and IRL signal, make when LASER Light Source 21 produces the IRL signal, this first pulse P1 will trigger sampling/maintenance timing sequence generating circuit 41 makes peak detection signal PKA_RST become Low (low) by Hi, notice peak detctor 42 has peak value near, makes peak detctor 42 leave replacement (reset) pattern and enters the peak value detected state.Therefore, when simulated peak detecting device 42 is obtained and sent into to this WRF signal of being returned from CD reflection by the IPL signal by this photodetector 23, this simulated peak detecting device 42 can in time carry out peak value to this WRF signal and detect, and this peak detection signal PKA_RST becomes the cycle of the time interval T of Low greater than this WRF signal by Hi, therefore at this moment between among the interval T, simulated peak detecting device 42 can accurately detect this WRF signal and obtain the peak A of WRF signal.Then, when this writes the second pulse P2 of clock signal RTS and the 3rd pulse P3 and arrives in regular turn, can make sampling/maintenance timing sequence generating circuit 41 produce this first and second sample-pulse signal SH_B and SH_C respectively and give this first and second sample-and-hold circuit 53,54, make first and second amplitude level B and the C that between the sampling date of first and second sample-pulse signal SH_B and SH_C, obtain respectively and keep this WRF signal.
Then, as shown in Figure 6, when the peak detection signal PKA_RST of simulated peak detecting device 42 becomes Low by Hi, and after making simulated peak detecting device 42 obtain the peak value of WRF signal, sampling/maintenance timing sequence generating circuit 41 can be controlled multiplexer 45 by the output first control signal UTA, so that connect simulation peak detctor 42 and analog/digital converter 46, carry out being stored in the computing circuit 47 after the digitizing this peak A is sent into analog/digital converter 46.Simultaneously, after peak A has been 42 samplings of simulated peak detecting device, peak detection signal PKA_RST will become Hi by Low, make simulated peak detecting device 42 enter Reset Status, prepare to detect the peak value of next WRF signal.Similarly, when first sample-and-hold circuit 43 has been finished sampling and after peak A finished digitizing, sampling keeps timing sequence generating circuit 41 promptly can export second control signal UTB control multiplexer 45, to connect first sample-and-hold circuit 43 and analog/digital converter 46, thereby the first amplitude level B is sent into analog/digital converter 46 to carry out digitizing and is stored in the computing circuit 47, and finish sampling and after the first amplitude level B finishes digitizing at second sample-and-hold circuit 44, export the 3rd control signal UTC control multiplexer 45, connecting second sample-and-hold circuit 44 and analog/digital converter 46, carry out digitizing and be stored in the computing circuit 47 thereby the second amplitude level C is sent into analog/digital converter 46.Therefore, when the peak A of finishing the WRF signal and first, second amplitude level B, C obtain and it is carried out steps such as digitizing and storage after, above-mentioned steps just can be repeated to carry out peak A and first, second amplitude level B, the C to obtain next WRF signal again.This is because because the rate of change of WRF signal was compared with the time of finishing above-mentioned steps is slowly, therefore, do not need each WRF signal is detected, so, for the foregoing reasons and use multiplexer 45 to switch so that simulated peak detecting device 42 when using analog/digital converter 46 in turn with first and second sampling/holding circuit 43,44, the present invention only need use the low speed analog/digital converter 46 with lower cost and low power consumption.
Moreover, though present embodiment uses first and second sampling/holding circuit 43,44 as an illustration, but the present invention is not limited in and uses two sampling/holding circuits 43,44, but can increase and decrease the usage quantity of this sampling/holding circuit according to the requirement of accuracy in the practical application.
Above-mentioned peak A and first and second level value B, the C that is stored in the computing circuit 47 then can form the calculating of usefulness (MFE) computing formula and obtain mark formation usefulness signal (hereinafter to be referred as the MFE signal) by mark, and this MFE signal is represented the quality of the mark that this WRF signal produces on this optical recording media 3, as for this MFE computing formula because a variety of (V that use in the above-mentioned prior art are arranged
A/ (V
A-V
B) computing formula is wherein a kind of), and be all the prior art that the correlation technique personage knows, do not give unnecessary details so do not add in addition at this.
And, by aforementioned prior art as can be known, when exporting best laser power, can produce best MFE signal, and should the best MFE signal be a fixed value, therefore as shown in Figure 4, when getting this best MFE signal as MFE echo signal of the present invention, and when deducting error that this MFE signal produces as control signal control laser drive circuit 22 with this MFE echo signal, can be by the laser power output of control LASER Light Source 21, make this MFE signal drive nearly this MFE echo signal gradually, and then make the best laser power of LASER Light Source 21 outputs, thereby reach the purpose that the best titime quality is provided on optical recording media.
Via above-mentioned explanation, principal feature of the present invention can be summarized as follows:
1. with reference to shown in Figure 6, because when MFE signal generation device 4 of the present invention uses simulated peak detecting device 42 to detect the peak value of WRF signal, simulated peak detecting device 42 before this WRF signal produces, promptly started and its peak value detection zone between T cover the whole WRF signal period, therefore, no matter whether the peak of this WRF signal changes because of the variable of discs, simulated peak detecting device 42 all can accurately be obtained the peak value of this WRF signal.
2. because the rate of change of WRF signal is slowly compared to the speed of analog/digital converter 46,, the interval of detection WRF signal need not detect each WRF signal so can elongating, therefore, the present invention only need use the low speed analog/digital converter 42 of low cost and low consumpting power, first and second sample-and-hold circuit 43,44 to be connected to share analog/digital converter 47 with the selectivity of this analog/digital converter 46, not only saves cost and circuit is more simplified.
In sum, mark of the present invention forms the peak value that usefulness signal generating method and device thereof can be obtained this WRF signal by the simulated peak detecting device 42 accurate detections that mark forms usefulness signal generation device 4, and the take a sample various amplitude level of this WRF signal of sampling/holding circuit of using right quantity, and the MFE signal of generation high accuracy, with laser power by these LASER Light Source 21 output the bests of this MFE signal controlling, and then promote the record quality of this optical recording system 2, and reach the purpose of sharing analog/digital converter 47, thereby has the effect that reduces manufacturing cost and simplify circuit by the use of multiplexer 46.
More than invention has been described by preferred embodiment, but the one of ordinary skilled in the art it should be understood that can be under the situation that does not deviate from aim of the present invention and scope, the present invention is carried out change on various forms and the details.
Claims (16)
1. a mark forms the usefulness signal generating method, and this method is applied in the optical recording system, and this optical recording system has: LASER Light Source, and it provides light incident write signal to can read mark to form on optical recording media; And photodetector, in order to detect the reflection write signal of this light incident write signal from this optical recording media reflection, this method comprises:
Detect a peak value of this reflection write signal and this reflection write signal of taking a sample to obtain at least one amplitude level; With
This peak value and this amplitude level calculate to produce mark according to the MFE computing formula and form the usefulness signal, and this mark on forming usefulness signal and being formed on this optical recording media to can read mark corresponding.
2. mark as claimed in claim 1 forms the usefulness signal generating method, and wherein the time interval of write signal is reflected greater than this in interval detection time of this peak value.
3. mark as claimed in claim 1 forms the usefulness signal generating method, and wherein, this peak value and amplitude level will be stored in the computing circuit after the analog to digital conversion successively.
4. a mark forms the usefulness signal generation device, and it is applied in the optical recording system, and this optical recording system has: LASER Light Source, and it provides light incident write signal to can read mark to form on optical recording media; And photodetector, in order to detect the reflection write signal of this light incident write signal from this optical recording media reflection, this mark forms the usefulness signal generation device and comprises:
The simulated peak detecting device is connected in a sampling/maintenance timing sequence generating circuit to obtain detection signal, a peak value that detects this reflection write signal and obtain this reflection write signal under this detection signal control;
At least one sampling/holding circuit is connected in sampling/maintenance timing sequence generating circuit to obtain sampled signal, obtains the amplitude level of this reflection write signal under this sampled signal control; And
Computing circuit produces mark according to above-mentioned peak value and amplitude level and forms the usefulness signal, and this mark on forming usefulness signal and being formed on this optical recording media to can read mark corresponding.
5. mark as claimed in claim 4 forms the usefulness signal generation device, and wherein the time interval of write signal is reflected greater than this in interval detection time of this peak value.
6. mark as claimed in claim 4 forms the usefulness signal generation device, also comprise analog/digital converter, it is connected between this peak detctor and this sampling/holding circuit and this computing circuit, behind peak value and amplitude level digitizing that this peak detctor and this sampling/holding circuit are obtained, import this computing circuit again.
7. mark as claimed in claim 6 forms the usefulness signal generation device, also comprise multiplexer, it is arranged between this peak detctor and this sample-and-hold circuit and this analog/digital converter, is connected with this analog/digital converter selectivity in order to control this peak detctor and this sample-and-hold circuit.
8. mark as claimed in claim 7 forms the usefulness signal generation device, also comprise sampling/maintenance timing sequence generating circuit, in order to the peak detection signal that produces above-mentioned peak detctor, the sample-pulse signal of this sampling maintenance/circuit and the control signal of controlling this multiplexer switching.
9. laser power control method, this method is applied in the optical recording system, and this optical recording system has LASER Light Source, and it provides light incident write signal to can read mark to form on optical recording media, and this laser power control method comprises the following steps:
Detect the reflection write signal of this light incident write signal from this optical recording media reflection;
Detect a peak value of this reflection write signal and this reflection write signal of taking a sample to obtain at least one amplitude level;
This peak value and this amplitude level calculate to produce mark according to the MFE computing formula and form the usefulness signal, and this mark on forming usefulness signal and being formed on this optical recording media to can read mark corresponding; With
Form the best laser power of this LASER Light Source output of usefulness signal controlling according to this mark.
10. mark as claimed in claim 9 forms the usefulness signal generating method, and wherein the time interval of write signal is reflected greater than this in interval detection time of this peak value.
11. mark as claimed in claim 9 forms the usefulness signal generating method, wherein, this peak value and amplitude level will be stored in the computing circuit after the analog to digital conversion successively.
12. an optical recording system comprises:
LASER Light Source is in order to providing the light incident that can read mark write signal, with at the optical recording media identifying recording layer;
Photodetector is in order to detect signal and the output reflection write signal of this light incident write signal from this optical recording media reflection; And
Mark forms the usefulness signal generation device, is used to receive aforementioned reflection write signal, and produces according to this and can read the corresponding mark of mark with this and form the usefulness signal, and this mark formation usefulness signal generation device comprises:
The simulated peak detecting device is connected in a sampling/maintenance timing sequence generating circuit to obtain detection signal, a peak value that detects this reflection write signal and obtain this reflection write signal under this detection signal control;
At least one sampling/holding circuit is connected in sampling/maintenance timing sequence generating circuit to obtain sampled signal, obtains the amplitude level of this reflection write signal under this sampled signal control; And
One computing circuit produces this mark formation usefulness signal according to above-mentioned peak value and amplitude level.
13. optical recording as claimed in claim 12 system, wherein this peak value detection time the interval greater than the time interval of this reflection write signal.
14. optical recording as claimed in claim 12 system, wherein this mark formation usefulness signal generation device also comprises analog/digital converter, it is connected between this peak detctor and this sampling/holding circuit and this computing circuit, behind peak value and amplitude level digitizing that this peak detctor and this sampling/holding circuit are obtained, import this computing circuit again.
15. optical recording as claimed in claim 14 system, wherein this mark formation usefulness signal generation device also comprises multiplexer, it is arranged between this peak detctor and this sample-and-hold circuit and this analog/digital converter, is connected with this analog/digital converter selectivity in order to control this peak detctor and this sample-and-hold circuit.
16. optical recording as claimed in claim 15 system, wherein this mark formation usefulness signal generation device also comprises sampling/maintenance timing sequence generating circuit, in order to the peak detection signal that produces above-mentioned peak detctor, the sample-pulse signal of this sampling maintenance/circuit and the control signal of controlling this multiplexer switching.
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|---|---|---|---|
| CNB021323674A CN1306502C (en) | 2002-09-24 | 2002-09-24 | Producing method and device of signal marking forming efficiency |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021323674A CN1306502C (en) | 2002-09-24 | 2002-09-24 | Producing method and device of signal marking forming efficiency |
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| CN1485829A CN1485829A (en) | 2004-03-31 |
| CN1306502C true CN1306502C (en) | 2007-03-21 |
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| CNB021323674A Expired - Fee Related CN1306502C (en) | 2002-09-24 | 2002-09-24 | Producing method and device of signal marking forming efficiency |
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| JP4440207B2 (en) * | 2005-12-14 | 2010-03-24 | 太陽誘電株式会社 | Optical information recording / reproducing apparatus, optical information recording processing method, optical information recording medium, program, and central processing unit |
| CN105472274A (en) * | 2014-09-05 | 2016-04-06 | 恒景科技股份有限公司 | Image sensor |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5978124A (en) * | 1995-04-28 | 1999-11-02 | Mitsubishi Denki Kabushiki Kaisha | Light emitting control apparatus and optical transmitter |
| CN1238060A (en) * | 1996-09-26 | 1999-12-08 | 三洋电机株式会社 | Recording medium and its reproducer |
-
2002
- 2002-09-24 CN CNB021323674A patent/CN1306502C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5978124A (en) * | 1995-04-28 | 1999-11-02 | Mitsubishi Denki Kabushiki Kaisha | Light emitting control apparatus and optical transmitter |
| CN1238060A (en) * | 1996-09-26 | 1999-12-08 | 三洋电机株式会社 | Recording medium and its reproducer |
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