CN1087862C - Method for identifying and optimizing CD signal quality and CD apparatus - Google Patents
Method for identifying and optimizing CD signal quality and CD apparatus Download PDFInfo
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- CN1087862C CN1087862C CN96106148A CN96106148A CN1087862C CN 1087862 C CN1087862 C CN 1087862C CN 96106148 A CN96106148 A CN 96106148A CN 96106148 A CN96106148 A CN 96106148A CN 1087862 C CN1087862 C CN 1087862C
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Abstract
The present invention relates to a method for obtaining appropriate quality reading signals by automatically adjusting the reading X speed of optical disc machines. Data on optical discs can read at a high X speed, the states of the optical discs are automatically detected in reading, whether the optical discs are in an appropriate state of reading is judged, and the speed of data reading is adjusted to an appropriate reading X speed according to judged results. In addition, the present invention discloses an optical disc device using the method, which can read optical discs at a high X speed and automatically detect states of the optical discs in reading to change the reading X speed is changed in order to appropriately read data recorded on optical discs, and the quality of signal reading is not affected by the quality of optical discs.
Description
The present invention relates to the doubly fast automatic circuit of reading of a kind of CD player, it can high power speed (for example 8 times of speed) read the data on the CD, and the state can detect CD and be read the time, utilize the mode of adjusting the CD player reading speed automatically to obtain the signal that reads of suitable quality.
The specification of cd-rom recording of information is formulated in the Red Book (Red Book) of nineteen eighty-two institute's co-present by Phillips/Sony, wherein, the basic size of CD, signal record etc. all there is detailed regulation, but reading speed at that time adopts single times of fast reading to get speed, generally speaking, reading speed heal height then disk rotation speed improve relatively, yet along with making rapid progress of technology, CD player reads speed also fast more of CD.But, owing to be specified in problems such as following CD deformation, stained and thing skew that CD player is intrinsic, vibration, when the information that writes down on the CD is got in the high power fast reading, understand more serious, thereby cause the accuracy of data read to descend, even cause can't reading of data situation.So, one such as the high power of 8 times of speed speed CD player in, be starved of following function.Can judge automatically whether CD is normal in being read under the state, utilize to adjust and read the doubly mode of speed, read the recorded information on the CD, so that the signal that reads of suitable quality to be provided.
When getting recorded information on the CD, cause and read several major reasons that accuracy descends with the high power fast reading, will details are as follows.
Because the track generation type on the CD is to be right against the center of circle, helically is dispersed outwardly.The track of Xing Chenging when rotated, with respect to the CD center of circle, has an orbit displacement in this way, and when CD quality was not good, the orbit displacement amount can paranormal side-play amount.When reading signal, the swing that optical read head must be followed track swings back and forth, correctly to read signal.Must be noted that, when the CD velocity of rotation fast more (when CD-ROM fetches data with 8 times of fast readings at inner ring, rotating speed is up to 4000RPM), then optics picks up the more difficult track of following the tracks of of letter device, in this case, the ability that optical read head is followed track also needs relatively to improve, otherwise, can make the accuracy of data read descend.
In addition, the vibration of optical disk system also can cause the data read difficulty.Generally speaking, the root of optical disk system is moving is caused by following two main causes.A) CD rotates and lays particular stress on and cause vibration; Because CD player is gathered when getting data on the CD, by an Optical disk supporter dish CD is delivered in the rotating shaft, and the lay particular stress on heart of CD when rotating is difficult to utilize the method for prior correction to be overcome, and adds, the difference that each CD all has more or less lays particular stress on, so that during rotary CD.Cause and be difficult to the vibration controlling and predict.B) vibration that causes of CD player machinery; Proper vibration when the vibration that CD player causes mainly results from the Spindle Motor rotation.Above-described vibration all has substantial connection with disk rotation speed.Under other condition same case, its vibratory output that causes and its rotating speed square proportional.Vibratory output is big, and the servo-drive system ability of CD player also needs to improve relatively, otherwise, enough input abilities can't be provided.In addition, vibration also easily causes noise (electronic/mechanical) to increase and mechanical wear, and these all can influence the accuracy that signal reads.
In addition, along with disk rotation speed increases, the frequency of reading of data is also along with increase on CD, make also relative variation of optics and characteristic electron, and cause servo-drive system signal (FE, TE, RF ...) variation dies down, relatively, correctly read the also decay thereupon of ability of recorded data on the CD.
In addition, the not good wrong ratio of data read that also can cause of disc making process increases.Because each disc manufacturing plant man's making ability differs, minority CD even substandard, for example.CD thickness and weight differ, CD is laid particular stress on the heart, track off-centre, depression (pit) etc. are substandard (for example, recordable CD), thereby cause and read that the signal power differs and problem such as bad, perhaps, CD scratch, there are stained factors such as fingerprint also can influence the ability that reads recorded data on the CD.For this type of defective CD, CD player good when the limit in low power when speed can be than high power speed.
In addition, along with rotating speed increases, mechanical friction power also becomes duplicate ratio to increase and causes temperature to rise.In addition, heat that integrated circuit produces also increases along with arithmetic speed and rises.All this kind all can cause the change of machinery and properties of integrated circuit, even makes the CD distortion, thereby causes the data read difficulty.
In addition, along with the increase of CD player access times and time, wearing out of CD player is inevitable, and these factors all can have harmful effect to the reading capability under the high power speed.
When above-mentioned various factors reads the information that CD writes down in high power speed (for example, 8 times of speed), can cause the data read difficulty.
State when the present invention can detect CD automatically and is read, utilize the mode of adjusting disk rotation speed, read the data in the CD, state when wherein, CD is read is meant the physical state that reads signal quality when CD is read because of influences such as quality own, stained degree, CD player vibrations.Being not in good state of CD itself and can't be (for example with high power speed, when 8 times of speed) reading its interior data, according to the present invention, can avoid the not good CD of gyrating mass at full speed by reducing CD speed, cause that board vibration is too big, the signal variation of servo-drive system and can't the normal read peek, or after causing the essential retry of system repeatedly, just can read data, influence unfavorable factors such as system effectiveness.Therefore, system is moved under optimum operation speed, to obtain optimizer system efficient.
According to one object of the present invention, can be in each log-on data read operation and during essential rotary CD, earlier with such as the low power speed rotary CD of 1 times of speed to read the data in contents table on the CD (TOC) zone, judge disc types, utilize the mode of adjusting reading speed to obtain the suitable signal quality that reads.When if CD is video disc (Vedio CD) or interactive video CD (CD-I), read the doubly suitable speed (for example, 4 times of speed) of speed (for example, 8 times of speed) to be lower than specified maximum.But,, may read a times fast reading and fetch data with the highest, to obtain the signal that reads of suitable quality if when CD is other pattern CD.
According to another object of the present invention, can be by the measured rail number of tracking error signal, obtain in view of the above CD in eccentric error, adjusting reading speed, and obtain the signal that reads of suitable quality.As mentioned above, eccentric error is crossed conference influences reading of data of optical disk, so, when the eccentric error that records during greater than ratings, then reduce disk rotation speed to guarantee that optics picks up the letter device and can correctly read signal, if the eccentric error that records during less than ratings, is then reduced to disk rotation speed and is suitably read doubly fast (for example, 4 times of speed, 2 times of speed or 1 times of speed).Otherwise, then improve disk rotation speed, to obtain the signal that reads of suitable quality.
According to another object of the present invention, can judge and read quality of signals by the correction result of error recovery device (ECC unit), to adjust reading speed, obtain the suitable signal quality that reads.During data on reading CD, because the ratio of error of the data that read is excessive so that the error recovery device can't be with the misdata timing, the error recovery device can be sent and proofread and correct failure signal (error flag), proofread and correct failure signal if receive this, then reduce disk rotation speed, otherwise, then improve disk rotation speed to obtain the suitable signal quality that reads.
According to another object of the present invention, can judge by picking up frame synchronizing signal and read quality of signals, obtain the suitable signal quality that reads by adjusting reading speed.Generally speaking, be composed of frame synchronizing signal (Frame Synchronization Signal) on the CD, by this signal, optical disk drive system just can have the function of self clock (Self Clocking).The state (Get Frame Synchronization Signal) that this signal picks up in system is called GFS backward.When GFS is logical one, the phase-locked loop system (PLL) of representing DSP with the synchronization of CD; When GFS is logical zero, represent DSP phase-locked loop system (PLL) can't with the synchronization of CD.For example, by judging that frequency that GFS becomes logical zero can judge the signal quality of CD, whether exceed the pinning ability of servo-drive system.For example, when GFS becomes 0 ratio greater than ratings, then reduce disk rotation speed, otherwise the disk rotation speed that then raises is to obtain the suitable signal quality that reads.
Still,, judge the quality of RF signal, borrow number quality to obtain suitable reading through adjusting reading speed by the size of velocity deviation (Jitter) value according to another object of the present invention.Because the sequential of optical disk drive system is to produce in self clock (Self clocking) mode, so, the signal quality that reads on CD will make to produce error between cycle of consequent data bit and the standard time sequence that this error is called velocity deviation (Jitter) not for the moment.When velocity deviation (jitter) value is too big, represent the phase-locked loop system (PLL) of DSP can't pin the rotating speed of CD, thereby can't with the synchronization of CD.By the size of judging velocity deviation (Jitter) value, can judge the pinning ability whether present rotating speed exceeds servo-drive system.When velocity deviation (Jitter) value too hour, then reduce disk rotation speed, otherwise the disk rotation speed that then raises is to obtain the suitable signal quality that reads.
According to another object of the present invention, according to the RF signal amplitude size that reads signal, to judge signal quality, through adjusting reading speed to obtain the suitable quality that reads signal.Because during RF signal amplitude size, to make data parser (Data Slicer) data-signal of obtaining on CD correctly can't be analyzed out, so,, can learn in advance whether data parser can correctly come out the data analysis of reading by the size of judging the RF signal.For example, if the amplitude of RF during less than ratings, then reduce disk rotation speed, otherwise the disk rotation speed that then raises is to obtain to read the suitable quality of signal.
According to another object of the present invention, can be according to the control situation of servo-drive system, that is, servo-drive system whether can correctly follow the motion of CD and obtain desired signal (if, then be called and lock), by adjusting reading speed to obtain the suitable quality that reads signal.Generally speaking, earlier with high power speed rotary CD, if servo-drive system can't be locked, then its must retry till locking, this kind situation representation signal is bad or vibration is big, in this case, then CD is reduced to than low power speed,, servo-drive system obtains the signal that reads of suitable quality so that can correctly following CD, otherwise, then keep former speed.
According to another object of the present invention, provide a kind of method, can be according to temperature or environment temperature such as relevant apparatus such as motor or driver ICs, adjust reading speed and obtain the signal that reads of suitable quality.
In addition,, can provide panel control, to make things convenient for the user by setting such as related datas such as data reading speeds such as the input media of button according to the present invention.
According to another object of the present invention, provide a kind of above-mentioned purpose CD player of reaching.
The present invention can be when correctly detecting CD and be read state and with the state that records with compare corresponding to the relevant ratings of speed that reads doubly, utilize to adjust and read doubly fast method, obtain the signal that reads of suitable quality.Above-mentioned purpose of the present invention and associated advantages will with reference to relevant drawings, and more clearly present by the explanation of assigning embodiment.
The present invention takes following concrete structure:
CD player of the present invention read doubly fast automatic circuit, comprising: a testing circuit of Lian Jieing, a decision circuitry and times of whole circuit of velocity modulation successively;
State when testing circuit is used to detect CD and is read, output status signal is given decision circuitry;
The status signal of decision circuitry receiving test circuit output judges whether CD is in the state that can be read, and the output judging result signal gives times velocity modulation whole circuit;
The whole circuit of times velocity modulation receives the judging result signal of decision circuitry, and the motor driver by CD player changes the speed that CD is read data.
Wherein, described testing circuit comprises: a detecting signal unit and signal processing unit of Lian Jieing successively;
Detecting signal unit is used to detect with CD and is read the relevant focus servo of state, follows the trail of servo and the on off state of main axle servo and the status signal whether CD rotates;
Signal processing unit receives and handles the signal from detecting signal unit, and records the tracking error signal according to above-mentioned status signal, to obtain judging that CD is read the required parameter of state.
Wherein, described decision circuitry comprises: a CPU (central processing unit) and a connected respectively comparer, store the ROM (read-only memory) of executive routine;
The result signal warp that comparer receives from described signal processing unit compares with reference voltage, converts digital pulse signal to;
CPU (central processing unit) receives the digital pulse signal from comparer, carries out the program that is stored in the ROM (read-only memory), and according to the operation result signal, output judges that signal is to the whole circuit of described times of velocity modulation.
Wherein, the described times of whole circuit of velocity modulation comprises: a motor and a connected motor driver that drives CD;
Motor driver receives the output signal of described decision circuitry, with control and adjustment motor rotary speed.
Description of drawings:
Fig. 1 is the hardware configuration of CD player.
Fig. 2 A is a circuit block diagram, illustrates according to one embodiment of the invention according to the situation of tracking error signal with adjustment Spindle Motor speed.
Fig. 2 B be open at focus servo, follow the trail of servo close and the situation of CD rotation under measured tracking error (TE) signal.
Fig. 3 is a process flow diagram, illustrates according to one embodiment of the invention, according to the correction result of corrector, adjusts the method for reading speed.
Fig. 4 is a circuit block diagram, signal input in the CD player is described, handles and the output situation.
The present invention can be when detecting CD and be read state, read doubly fastly and adjust, not because of factors such as the kind of meeting CD own or quality be not the good data of reading and recording on CD correctly, thereby can provide the signal that reads with suitable quality.
Because the CD of some different types when getting the speed reading of data such as 8 times of high power fast readings such as speed, can't provide the good information quality, so one embodiment of the invention can be differentiated the CD pattern earlier, gets record data thereon suitably to read times fast reading again.
At first read data in contents table (the Table of Content) zone that is installed on the CD in the CD player at present with reading speed such as 1 times of speed, when judging that this CD is a CD such as video disc (Veido CD) or interactive video CD patterns such as (CD-I), speed is adjusted to the doubly speed that is suitable for reading its data with reading doubly, to obtain the signal that reads of suitable quality.
Because the problem that lays particular stress on of CD itself can cause vibration, and CD is in pressing process, owing to center of circle skew causes eccentric error not of uniform size, so one embodiment of the invention can be measured CD and be read eccentric error under the state, adjust in view of the above and read doubly speed, so that the signal that reads of suitable quality to be provided.
For example, at first, open at focus servo (that is, optics picks up the letter head and can focus on), follow the trail of servo close and the situation of CD rotation under, by being in a fixed position but can self-focusing optics pick up the letter head and detect tracking error signal TE, measured in this case tracking error signal TE is shown in Fig. 2 B.Offset rail number when the means of chaotic signals A on the TE signal that records and the wave number of the similar sine wave between the B are represented the CD rotation, one input end of this tracking error signal TE meeting input comparator, another input end of comparer has variable reference voltage, the tracking error signal TE of simulation can be changed into the digital pulse signal sequence, from then on whether the pulse number of sequences of pulsed signals draws eccentric error greater than specified straight, this sequences of pulsed signals can be imported CPU (central processing unit) (CPU) again, CPU (central processing unit) can be handled the program of this signal in being stored in ROM and carry out, and obtain this optical disc eccentricity control information, and with compare corresponding to the different ratings that read doubly speed, and obtain the reading speed that is suitable for this CD, again via digital signal processor (DSP) with the drive motor device, utilize the method for adjusting motor rotary speed, reach and suitably read the purpose that data on the CD are got in times fast reading, that is, the eccentric error that records is greater than corresponding to the ratings of different rotation rates the time, then reduce disk rotation speed, otherwise, then improve rotational speed.
In addition, for example, also can open, follow the trail of under the situation that servo unlatching and main axle servo open, by the tracking error signal that the records input signal of device one input end as a comparison, when its level during greater than the reference voltage of comparer one end at focus servo, then comparer can be exported a high level signal, representing the optical disc eccentricity error excessive, and according to this signal, and make relative program be performed it, so that with suitable speed drive motor, suitably read doubly speed and obtain.
According to another embodiment of the present invention, because factors such as dirty wound of CD or root are moving can cause data read errors, generally speaking, whether error recovery device (ECC unit) can predict the data that read wrong, and under the little situation of ratio of error, automatically calibrating reading of data and get and seek correct data, still, if the ratio of error that records reading of data is excessive, then can't proofreaies and correct and send the signal of proofreading and correct failure (error flag).Therefore, whether send by the misjudgment corrector and to proofread and correct failure signal and whether the misjudgment ratio is excessive, through adjusting reading speed to obtain the suitable signal quality that reads, that is, the error recovery device is sent when proofreading and correct failure signal, then reduces disk rotation speed, otherwise, the disk rotation speed that then raises is to obtain the signal that reads of suitable quality.
Optics picks up a letter obtained signal via after the digital signal processor processes, can send the GFS signal.As mentioned above, can judge the quality of servosignal, by adjusting reading speed to obtain the suitable doubly number quality that reads by picking up frame synchronizing signal.Therefore, according to another example of the present invention, can be according in the GFS signal of in some cycles, obtaining, calculate logic and be 0 the shared ratio (for example) of GFS signal, and with its with compare corresponding to the different ratings that read doubly speed, if the ratio that records is greater than ratings, then the drive motor device is to reduce disk rotation speed, if the ratio that records is less than ratings, then drive motor is with the rising disk rotation speed.
Still according to another embodiment of the present invention, optics picks up the RF signal that the letter device reads and can deliver to the digital signal amplifier via amplifier and obtain the output of velocity deviation (jitter) value, this velocity deviation (Jitter) value and ratings are compared, if this velocity deviation (Jitter) value is greater than ratings, then the drive motor device is to reduce disk rotation speed to suitable speed, if less than ratings, then the drive motor device is adjusted disk rotation speed to suitable speed to speed to improve motor rotary speed every poor (Jitter) value.
As shown in Figure 4, another enforcement according to the present invention is read, optics picks up the analog rf signal that the letter head read can amplify it via amplifier as above-mentioned, input to the RF level comparator again and output digit RF level, this digital level output is compared with ratings, if it is less than ratings, then reduce the motor rotational speed and make disk rotation speed be adjusted to suitable reading speed via motor driver, if it greater than ratings, then makes disk rotation speed be adjusted to suitable reading speed via motor driver rising motor rotational speed.
In addition, when making that owing to factors such as the quality of CD are bad or stained the signal feedback that is read is given servo-drive system, because weak output signal or factor such as bad, cause servo-drive system heavily to cover action always and can't pin.Therefore, according to another embodiment of the present invention, the CD that the present invention at first is read with the rotation of high power speed, and begin to start a tracking error (TMON) pulse signal, then, judge in predetermined period, whether for example, 2ms/ is the speed cycle doubly, have the TMON signal to produce, if the result is for being then to count the number of TMON pulse, then, whether the number of judging TMON is greater than ratings, if greater than ratings, then reduce motor speed, if then keep former rotating speed less than ratings.If in predetermined period, can't record the TMON signal, then keep former rotating speed.
According to another embodiment of the present invention, for example, detect the temperature of relevant apparatus such as motor or driver IC with temperature sensor, and this is recorded temperature via analog and digital signal conversion and received by central processing unit, to compare with ratings, suppose greater than ratings, then disk rotation speed is reduced, if less than ratings, the disk rotation speed that then raises is to reach suitable reading speed.
In addition, for example,, provide panel control, be available for users to by the input media of button or knob and related datas such as setting data reading speed according to embodiments of the invention.
Again according to another embodiment of the present invention, provide a kind of CD player of using said method, times velocity modulation engagement positions that judgment means that it comprises the pick-up unit be made up of detecting signal unit and signal processing unit, be made up of CPU, ROM and comparer and motor driver and motor constitute; Detecting signal unit comprises such as optics and picks up letter head and temperature sensor etc., and it can detect with CD and be read the relevant signal of state, for example orbit error trace signals or temperature, and then, this number detecting unit can export the signal that records to signal processing unit.This signal processing unit is by formations such as digital signal processor (for example SONY CXD 25400), servo signal processor, audio frequency digital analog converter, RF signal amplifier and error recovery devices.The measured signal of its meeting processing signals detecting unit such as the RF signal, for example, the RF signal that picks up the letter head from optics can amplify its amplitude via the RF signal amplifier earlier, RF signal after amplifying can be output to digital signal processor processes, afterwards, signal be output again to judgment means with as the foundation of judging, perhaps, this signal of handling is output to servo signal processor (for example SONY CXD 1372), as the feedback signal of the control loop of servo-drive system.Judgment means by CPU (for example Intel 8032), store executive routine ROM, and comparer formed, the signal of self-test device since this judgment means meeting, for example, by track tracking error signal obtained in the RF signal, as judging that CD is read the input parameter of state, CPU can according to this input signal carry out the program that is stored among the ROM and according to the operation result output signal so that CD changes rotating speed.In the judgment means, comparison means has that a track trace signals is input into an input end and another input end has a reference voltage, the track trace signals input meeting of simulation is converted into a digit pulse through comparer thus, and this output signal is called TMON, and it can import CPU.Judgment means exports judged result to doubly fast adjuster via signal processor, the fast adjuster of this times is made of motor driver and motor, and it can adjust disc speed to suitable reading speed according to judged result.
In addition, according to another embodiment of the present invention, CD player also can be equipped with a panel input media and import voluntarily such as reading information such as times speed to allow the user.
After reading above-mentioned explanation of the present invention in detail, those skilled in the art can carry out different changes in modification at the present invention not deviating under spirit of the present invention and the scope.
Claims (10)
1, a kind of CD player read doubly fast automatic circuit, it is characterized in that, comprising: a testing circuit of Lian Jieing, a decision circuitry and times of whole circuit of velocity modulation successively;
State when testing circuit is used to detect CD and is read, output status signal is given decision circuitry;
The status signal of decision circuitry receiving test circuit output judges whether CD is in the state that can be read, and the output judging result signal gives times velocity modulation whole circuit;
The whole circuit of times velocity modulation receives the judging result signal of decision circuitry, and the motor driver by CD player changes the speed that CD is read data.
2, circuit according to claim 1 is characterized in that, described testing circuit comprises: a detecting signal unit and signal processing unit of Lian Jieing successively;
Detecting signal unit is used to detect with CD and is read the relevant focus servo of state, follows the trail of servo and the on off state of main axle servo and the status signal whether CD rotates;
Signal processing unit receives and handles the signal from detecting signal unit, and records the tracking error signal according to above-mentioned status signal, to obtain judging that CD is read the required parameter of state.
3, circuit according to claim 1 and 2 is characterized in that, described decision circuitry comprises: a CPU (central processing unit) and a connected respectively comparer, store the ROM (read-only memory) of executive routine;
The result signal warp that comparer receives from described signal processing unit compares with reference voltage, converts digital pulse signal to;
CPU (central processing unit) receives the digital pulse signal from comparer, carries out the program that is stored in the ROM (read-only memory), and according to the operation result signal, output judges that signal is to the whole circuit of described times of velocity modulation.
According to claim 1 or 2 or 3 described circuit, it is characterized in that 4, the described times of whole circuit of velocity modulation comprises: a motor and a connected motor driver that drives CD;
Motor driver receives the output signal of described decision circuitry, with control and adjustment motor rotary speed.
5, circuit according to claim 2 is characterized in that, described detecting signal unit comprises: detection is picked up the letter head with the optics that CD is read the relevant signal of state, and the signal output part that optics picks up the letter head connects described signal processing unit.
6, according to claim 2 or 5 described circuit, it is characterized in that, described signal processing unit comprises: RF signal amplifier, the digital signal processor, the servo signal processor that are connected with the RF signal amplifier respectively, and audio frequency digital analog converter that is connected with digital signal processor respectively and error recovery device; Wherein, digital signal processor is connected with servo signal processor;
Described RF signal amplifier connects described optics and picks up the letter head;
Digital signal processor is connected with described motor driver respectively with servo signal processor;
The error recovery device is connected with described CPU (central processing unit) again, with its output error marking signal and obtain the parameter of judging that the CD reading state is required whether; Whether described CPU (central processing unit) basis receives the error flag signal is exported the judgement signal, exports motor driver to via signal processor, so that CD changes rotating speed;
7, circuit according to claim 1 is characterized in that, also comprises:
A control panel, it has input media, is imported voluntarily by the user and reads times speed control system data; Control panel connects described judgment means, and judgment means is according to from the input signal of control panel, judges whether CD is in suitably to be read state.
8, circuit according to claim 5 is characterized in that, described detecting signal unit also comprises: detect the temperature sensor that is read the relevant signal of state with CD, the signal output part of temperature sensor connects described signal processing unit.
9, circuit according to claim 8 is characterized in that, described temperature sensor is positioned at around the described motor.
10, circuit according to claim 8 is characterized in that, described temperature sensor is positioned at around the described motor driver.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96106148A CN1087862C (en) | 1996-04-18 | 1996-04-18 | Method for identifying and optimizing CD signal quality and CD apparatus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96106148A CN1087862C (en) | 1996-04-18 | 1996-04-18 | Method for identifying and optimizing CD signal quality and CD apparatus |
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| Publication Number | Publication Date |
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| CN1187669A CN1187669A (en) | 1998-07-15 |
| CN1087862C true CN1087862C (en) | 2002-07-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN96106148A Expired - Lifetime CN1087862C (en) | 1996-04-18 | 1996-04-18 | Method for identifying and optimizing CD signal quality and CD apparatus |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW569184B (en) | 2002-03-04 | 2004-01-01 | Asustek Comp Inc | Write/record speed adjustment method of data recording device |
| CN100421158C (en) * | 2002-10-11 | 2008-09-24 | 华硕电脑股份有限公司 | Method for preventing data read-out error of optical disk drive |
| KR100499584B1 (en) * | 2003-01-03 | 2005-07-07 | 주식회사 히타치엘지 데이터 스토리지 코리아 | Method for controlling data read speed for medium |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4488279A (en) * | 1980-10-20 | 1984-12-11 | Discovision Associates | Video recorder-playback machine |
| US4757374A (en) * | 1986-03-20 | 1988-07-12 | Image Premastering Services, Ltd. | Video disc recording machine |
| CN1098218A (en) * | 1993-04-14 | 1995-02-01 | 三星电子株式会社 | Track count servo circuit and method thereof |
-
1996
- 1996-04-18 CN CN96106148A patent/CN1087862C/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4488279A (en) * | 1980-10-20 | 1984-12-11 | Discovision Associates | Video recorder-playback machine |
| US4757374A (en) * | 1986-03-20 | 1988-07-12 | Image Premastering Services, Ltd. | Video disc recording machine |
| CN1098218A (en) * | 1993-04-14 | 1995-02-01 | 三星电子株式会社 | Track count servo circuit and method thereof |
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| CN1187669A (en) | 1998-07-15 |
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