CN1187669A - 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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- CN1187669A CN1187669A CN 96106148 CN96106148A CN1187669A CN 1187669 A CN1187669 A CN 1187669A CN 96106148 CN96106148 CN 96106148 CN 96106148 A CN96106148 A CN 96106148A CN 1187669 A CN1187669 A CN 1187669A
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Abstract
A method for automatical regulation of the speed to read optical disk and higher quality of signals read from optical disk and its device are disclosed. It can read data from optical disk at high speed while automatically test the state of optical disk on reading to judge if it is in proper state. According to judgement, the speed to read optical disk is regulated to reach proper speed.
Description
The present invention relates to a kind of state that can high power speed (for example 8 times of speed) reads the data on the CD and can detect CD when being read, use automatic adjustment CD player reading speed to obtain the method that suitable device matter reads signal, also relate to a kind of the method for using to obtain the CD player that reads signal of suitable quality.
The specification of cd-rom recording of information is ordered 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 the design of 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 more and more faster of CD.But, owing to be specified in problems such as following CD deformation, stained and physical deflection 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 take place.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, use to adjust and read doubly 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 number can paranormal offset numbers.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, (CD-ROM is at inner ring during with 8 multiple reading of data when the CD velocity of rotation is fast more, rotating speed is up to 4000 RPM), then optics picks up the letter device difficult track track track of healing, in this case, the ability that optical read head is followed rail 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 vibration of optical disk system is caused by following two main causes.A) CD rotates and lays particular stress on and cause vibration; Because when CD player reads 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, add, the difference that each CD all has more or less lays particular stress on, so that during rotary CD, cause to 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 change the square proportional of bundle.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, hole substandard (for example, recordable CD) such as (pit), 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, good when the tolerance of CD player when low multiple 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 machinery and properties of integrated circuit to change, 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.
The state when but the present invention's Auto-Sensing CD is read, use the adjustment disk rotation speed, read the data in the CD, wherein, the state when CD is read is meant the physical state that reads signal quality when CD is got by meter 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 normal read fetching data, or after causing the essential retry of system repeatedly, just can read and fetch data, influence unfavorable factors such as system effectiveness.Therefore, system is moved under optimum operation speed, use obtaining 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, use and adjust reading speed to obtain the suitable signal quality that reads.When if CD is video disc (Vedio CD) or interactive video CD (CD-I), to be lower than suitable speed (for example, the 4 times of speed) reading of data that specified maximum reads multiple (for example, 8 times of speed).But,, may use the signal that reads that obtains suitable quality with the highest multiple reading of data that reads 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 use and adjust reading speed to 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, use the signal that reads that obtains suitable quality.
According to another object of the present invention, can judge the quality of read signal by the correction result of error recovery device (ECC unit), use and adjust reading speed to 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 disc spin speed and use and obtain the suitable signal quality that reads.
According to another object of the present invention, can judge and read quality of signals by grasping frame synchronizing signal, use and adjust reading speed to obtain the suitable signal quality that reads.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 of this signal of system grabs (Get Frame Synchronzation Signal) 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 uses obtaining the suitable signal quality that reads.
Still,, judge the quality of RF signal, use and adjust reading speed to obtain the suitable signal quality that reads 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 uses obtaining the suitable signal quality that reads.
According to another object of the present invention,,, use and adjust reading speed to obtain the suitable quality that reads signal to judge signal quality according to the RF signal amplitude size that reads signal.Because the RF signal amplitude too hour, 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 used the suitable quality that obtains to read 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), use and adjust 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, send data mutually by setting such as the input media of button such as data reading speed etc. to make things convenient for the user 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 that reads multiple, use to adjust and read multiple, and 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 following embodiment.
Fig. 1 is the hardware configuration of CD player.
Fig. 2 A is a calcspar, 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 error recovery device, adjusts the method for reading speed.
Fig. 4 is a calcspar, and signal input in the CD player, the situation of handling and exporting are described.
The present invention can be by the state of detecting CD be read the time, reads doubly fastly and adjust, and not because of factors such as the kind of 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 in the CD that is installed at present in the CD player 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), be adjusted to the doubly speed that is suitable for reading of data with reading multiple, 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, use the signal that reads that suitable quality is 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 letter head detecting 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 jade-like stone and becomes 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 ratings, 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 multiple, and obtain the reading speed that is suitable for this CD, use the rotating speed of adjusting motor with the drive motor device via digital signal processor (DSP) again, and reach suitably to read the purpose that multiple reads data on the CD, 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 of servo unlatching and main axle servo unlatching at focus servo, by the tracking error signal that the records input of device one input end as a comparison, when its level during greater than the reference voltage of comparer one end, then comparer can be exported a high level signal, to represent the optical disc eccentricity error excessive, and according to this signal, and make relative program be performed it, so that obtain and suitably read multiple with suitable speed drive motor.
According to another embodiment of the present invention, because factors such as dirty wound of CD or vibration 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 obtain 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, use and adjust reading speed to obtain the suitable signal quality that reads, that is, the error recovery device is sent when proofreading and correct failure signal, loses the reduction disk rotation speed, otherwise, the disk rotation speed that then raises is used the signal that reads that obtains 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, use and adjust reading speed to obtain the suitable signal quality that reads by grasping frame synchronizing signal.Therefore, according to another embodiment 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 velocity deviation (Jitter) value is less than ratings, then the drive motor device is adjusted disk rotation speed to suitable speed to improve motor rotary speed.
As shown in Figure 4, according to another embodiment of the present invention, 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 tracking error supervision (TMON) pulse signal, then, judge in predetermined period, for example, in the 2ms/ multiple cycle, whether there is the TMON signal to produce, if the result is for being, then count the number of TMON pulse, then, whether the number of judging TMON is greater than ratings, if then reduce motor speed, if then keep former rotating speed less than ratings greater 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, temperature with relevant apparatus such as temperature sensor detecting motor or driver ICs, and this is recorded temperature via analog and digital signal conversion and received by central processing unit, use, compare, if then disk rotation speed is reduced greater than ratings with ratings, 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 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, the multiple adjusting gear that judgment means that it comprises the arrangement for detecting be made up of signal detection unit and signal processing unit, be made up of CPU, ROM and comparer and motor driver and motor constitute; The signal detection unit comprises such as optics and picks up letter head and temperature sensor etc., it can be detected with CD and be read the relevant signal of state, for example track track error trace signals or temperature, this signal detection unit can export the signal that records to signal processing unit then.This signal processing unit is made of digital signal processor (for example SONY CXD25400), servo signal processor, audio frequency digital analog converter, RF signal amplifier and error recovery device etc.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 it, afterwards, signal be output again to judgment means with as the foundation of judging, perhaps, this handles signal later and is output to servo signal processor (for example SONY CXD1372), 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-detection 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 computing structure 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 through becoming a digit pulse after the comparer conversion thus, and this output signal is called TMON, and it can import CPU.Judgment means can export judged result to the multiple adjuster via signal processor, this multiple adjuster 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 multiple to allow the user.
After reading above-mentioned explanation of the present invention in detail, those skilled in the art can carry out different modifications and variation at the present invention not deviating under spirit of the present invention and the scope.
Claims (42)
1. the automatic CD player of adjusting reads doubly fast to obtain the method that suitable quality reads signal, but its high power reads the data on the CD fastly, and video compact disk when being read state and change CD player read doubly that speed reads signal to obtain suitable quality comprises the steps:
Read the data on the CD;
The detecting status signal, the status signal when the detecting CD is read;
Judge compact disc states,, judge whether CD is in the default state that is read according to the status signal that records;
Whether doubly speed is read in adjustment, be in according to CD and preset the speed that is read the judged result of state and changes reading of data, uses making CD be in the default state that is read.
2. according to the method for claim 1, it is characterized in that, before this reads the data of optical disk step, further comprise a step, get CD content table data with the low power fast reading, use the judgement disc types,, then maximum ratedly read suitable times of doubly fast fast reading and fetch data to be lower than if CD is video disc or interactive video CD.
3. according to the method for claim 1, it is characterized in that, the step of this detecting status signal, comprise according to focus servo, follow the trail of servo and the on off state of main axle servo and the state whether CD rotates, and record the tracking error signal, obtain according to this to judge that CD is read the required parameter of state.
4. according to the method for claim 3, it is characterized in that, open at focus servo, follow the trail of and servoly close, and under CD rotates, record the tracking error signal, obtain according to this to judge that CD is read the required parameter of state.
5. according to the method for claim 4, it is characterized in that this judgement CD is read the required parameter of state and comprises the measured number of tracks of this tracking error signal.
6. according to the method for claim 3, it is characterized in that, open, follow the trail of servo unlatching at focus servo, reach under the situation of main axle servo unlatching, record the tracking error signal, obtain in view of the above to judge that CD is read the required parameter of state.
7. according to the method for claim 6, it is characterized in that this judgement CD is read the amplitude that the required parameter of state comprises this tracking error signal.
8. according to the method for claim 3, it is characterized in that, this determining step, comprise the eccentric error that records the CD rotation according to the obtained parameter of this tracking error signal, and this eccentric error that records compared with the ratings corresponding to different multiples, doubly trot adjust reading speed suddenly to the suitable foundation of reading speed and read as this adjustment.
9. method according to Claim 8 is characterized in that, the step of speed is read doubly in this adjustment, and during greater than critical offset, it is doubly fast to obtain suitably to read to reduce disk rotation speed at offset.
10. according to the method for claim 9, it is characterized in that the step of speed is read doubly in this adjustment, during less than critical offset, the rising disk rotation speed is doubly fast to obtain suitably to read at offset.
11. the method according to claim 1 is characterized in that, the step of this detecting status signal comprises whether detecting error recovery device is sent the error flag signal and obtained to judge that CD is read the required parameter of state.
12. the method according to claim 11 is characterized in that, this determining step can be according to whether receiving this error flag signal reads as this adjustment doubly trot adjusts the foundation of reading speed to suitable reading speed suddenly.
13. the method according to claim 12 is characterized in that, the doubly step of speed is read in this adjustment, when judging that this error flag is received, reduces disk rotation speed to obtain suitable reading speed.
14. the method according to claim 12 is characterized in that, the doubly step of speed is read in this adjustment, and when judging that this error flag is not received, the disk rotation speed that can raise is to obtain suitable reading speed.
15. the method according to claim 1 is characterized in that, the step of this detecting status signal comprises detecting extracting frame synchronizing signal and obtains to judge that CD is read the required parameter of state.
16. the method according to claim 15 is characterized in that, this judgement CD is read the required parameter of state, and to comprise logic be zero the extracting frame synchronizing signal ratio to measured extracting frame synchronizing signal total number.
17. method according to claim 15, it is characterized in that, this determining step, comprise according to this obtained zero logic number ratio that records of extracting frame synchronizing signal and comparing, read the doubly foundation of the extremely suitable reading speed of speed and read doubly trot rapid the adjustment as this adjustment with specified zero logic number ratio.
18. the method according to claim 17 is characterized in that, the step of speed is read doubly in this adjustment, and during greater than specified zero logic number ratio, the reduction disk rotation speed is to obtain suitable reading speed in the zero logic number ratio that records.
19. the method according to claim 17 is characterized in that, the step of speed is read doubly in this adjustment, record zero when patrolling the number ratio less than specified zero logic number ratio, improve disk rotation speed to obtain suitable reading speed.
20. the method according to claim 1 is characterized in that, the step of this detecting status signal comprises that time clock and the relation between the data bit generation cycle according to optical disk system obtains to judge that CD is read the required parameter of state.
21. the method according to claim 20 is characterized in that, this judgement CD is read the required parameter of state and comprises the time clock of optical disk system and the velocity deviation that data bit produces the difference in cycle.
22. the method according to claim 20 is characterized in that, this determining step comprises that the velocity deviation value and the rated speed deviate that record according to this compare, and reads the foundation of doubly trot adjusting the extremely suitable reading speed of reading speed suddenly as this adjustment.
23. the method according to claim 22 is characterized in that, the step of speed is read doubly in this adjustment, during greater than the rated speed deviate, reduces disk rotation speed to obtain suitable reading speed in the velocity deviation value that records.
24. the method according to claim 22 is characterized in that, the step of speed is read doubly in this adjustment, during less than the rated speed deviate, reduces disk rotation speed to obtain suitable reading speed in the velocity deviation value that records.
25. the method according to claim 1 is characterized in that, the step of this detecting status signal comprises that recording the RF signal width of cloth shakes size to be read the required parameter of state as the judgement CD
26. the method according to claim 25 is characterized in that, this determining step comprises that the RF signal amplitude and the ratings that record according to this compare, and reads the foundation of doubly trot adjusting the extremely suitable reading speed of reading speed suddenly as this adjustment.
27. the method according to claim 26 is characterized in that, the step of speed is read doubly in this adjustment, during less than ratings, reduces disk rotation speed to obtain suitable reading speed at the RF signal amplitude that records.
28. the method according to claim 26 is characterized in that, the step of speed is read doubly in this adjustment, during greater than ratings, improves disk rotation speed to obtain suitable reading speed at the RF signal amplitude that records.
29. the method according to claim 1 is characterized in that, the step of this detecting status signal comprises recording the predetermined point temperature as judging that CD is read the required parameter of state.
30. the method according to claim 29 is characterized in that, this predetermined point comprises Spindle Motor or as the integrated circuit of driver.
31. the method according to claim 29 is characterized in that, this determining step comprises that the predetermined point temperature value and the ratings that record according to this compare, and reads the foundation of doubly trot adjusting the extremely suitable reading speed of reading speed suddenly as this adjustment.
32. the method according to claim 31 is characterized in that, the step of speed is read doubly in this adjustment, during greater than ratings, reduces disk rotation speed to obtain suitable reading speed at the temperature value that records.
33. the method according to claim 1 is characterized in that, the step that this detects status signal comprises elder generation with high power speed rotary CD, and the servo signal of whether locking is to be read the required parameter of state as the judgement CD in the detecting unit interval.
34. the method according to claim 33 is characterized in that, this determining step, comprise according to this detecting status signal step whether record signal that servo-drive system do not lock and as this adjustment doubly trot to adjust reading speed suddenly to the suitable foundation of reading speed.
35. the method according to claim 34 is characterized in that, the step of speed is read doubly in this adjustment, when the signal that servo-drive system do not lock is received in judgement, reduces disk rotation speed to obtain suitable reading speed.
36. the method according to claim 35 is characterized in that, the step of speed is read doubly in this adjustment, then keeps former rotating speed when having received the signal that servo-drive system locks judging.
37. adjust CD player automatically and read doubly fast for one kind to obtain the method that suitable quality reads signal, but its high power reads the data on the CD fastly, and video compact disk when being read state and change CD player read doubly that speed reads signal to obtain suitable quality comprises that panel control makes the user can decide data reading speed by input media in its sole discretion.
38. high power speed CD player, but its high power reads the data on the CD fastly, and video compact disk when being read state and to change reading of CD player doubly fast, read signal to obtain suitable quality, comprising:
Arrangement for detecting, the state when the detecting CD is read provides status signal in view of the above;
Judgment means according to the status signal that arrangement for detecting records, is judged whether CD is in suitably to be read state;
The multiple adjusting gear according to the judged result output signal of judgment means, changes the speed of reading of data, uses making CD be in the state that suitably is read.
39. the CD player according to claim 38 is characterized in that, this arrangement for detecting comprises:
The signal detection unit, detecting is read the relevant signal of state with CD;
Signal processing unit is handled the signal from the signal detection unit, and the output result is given judgment means.
40. the CD player according to claim 38 is characterized in that, this judgment means comprises:
Comparer, the simulation tracking error conversion of signals of self-detection device becomes digital pulse signal in the future;
ROM (read-only memory) (ROM) stores the required program of CD player running;
CPU (central processing unit) (CPU) according to the signal from arrangement for detecting, is carried out the program that is stored among the ROM, the state when being read with the judgement CD.
41. the CD player according to claim 38 is characterized in that, the fast engagement positions of this times comprises:
Motor driver is according to the output signal of judgment means and CD-ROM drive motor;
Motor is subjected to the control of motor driver and adjusts rotating speed, to obtain the suitable doubly speed that reads.
42. high power speed CD player, but its high power reads the data on the CD fastly, and video compact disk when being read state and to change reading of CD player doubly fast, read signal to obtain suitable quality, comprising:
Control panel has input media and is imported voluntarily by the user and read times speed control system data;
Judgment means according to the input signal from control panel, is judged whether CD is in suitably to be read state;
The multiple adjusting gear according to the judged result output signal of judgment means, changes the speed of reading of data, uses making CD be in the state that suitably is read.
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 |
Applications Claiming Priority (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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1187669A true CN1187669A (en) | 1998-07-15 |
| CN1087862C CN1087862C (en) | 2002-07-17 |
Family
ID=5119027
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN96106148A Expired - Lifetime CN1087862C (en) | 1996-04-18 | 1996-04-18 | Method for identifying and optimizing CD signal quality and CD apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1087862C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6922382B2 (en) | 2002-03-04 | 2005-07-26 | Asustek Computer Inc. | Method for adjusting the write speed of data recording device and apparatus thereof |
| CN1310217C (en) * | 2003-01-03 | 2007-04-11 | 日立-Lg数据存储韩国公司 | Method of controlling playing speed in optical disk 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 |
Family Cites Families (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 |
| CN1039556C (en) * | 1993-04-14 | 1998-08-19 | 三星电子株式会社 | Track counting servo circuit and method therefor |
-
1996
- 1996-04-18 CN CN96106148A patent/CN1087862C/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6922382B2 (en) | 2002-03-04 | 2005-07-26 | Asustek Computer Inc. | Method for adjusting the write speed of data recording device and apparatus thereof |
| 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 |
| CN1310217C (en) * | 2003-01-03 | 2007-04-11 | 日立-Lg数据存储韩国公司 | Method of controlling playing speed in optical disk device |
| US7554911B2 (en) | 2003-01-03 | 2009-06-30 | Hitachi-Lg Data Storage Korea, Inc. | Method for controlling play speed in an optical disc device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1087862C (en) | 2002-07-17 |
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