CN1385852A - Method for determining CD speed by system detection - Google Patents
Method for determining CD speed by system detection Download PDFInfo
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- CN1385852A CN1385852A CN 01118109 CN01118109A CN1385852A CN 1385852 A CN1385852 A CN 1385852A CN 01118109 CN01118109 CN 01118109 CN 01118109 A CN01118109 A CN 01118109A CN 1385852 A CN1385852 A CN 1385852A
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- speed
- rom drive
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- reading
- read
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Abstract
This invention provides a method of determining CD speed by the system detection. Then starting an operation, a drive receives a fetch order from the operation system or applied program to get the number of zone blocks and begin fetching time values and operate on the last time zone block numbers, last time finishing fetch time values so as to get the needed fetch speed of the present invention and see of it's bigger or smaller than the present fetch speed of the drive, if conforms, to register the times and repeat the process, when times are bigger than the critical values, then raise or reduce the speed of the disk drive.
Description
The present invention relates to a kind of method that detects the decision CD speed by system, particularly the time of every value of reading of a kind of detection system,, decide the rotating speed of CD-ROM drive through computing.
Along with the doubly increase of speed of CD writer, the user requires the speed of CD-ROM drive reading of data also and then to increase, yet the rotating speed of the Spindle Motor of CD-ROM drive is higher, incident vibration, heat also increase thereupon, the stability of optical lasers read head reading of data will be influenced, reduce optical drive performance greatly, and noise and power consumption are increased.
In general, high rotating speed is only just useful when reading mass data, if playing back music CD or VCD CD then can't be brought into play its effect fully, rotating speed only need be kept one to two times of speed, so the computer system reads data are play if just be used for, therefore just do not need too high rotating speed, if can detect the rotating speed of CD-ROM drive actual needs when reading, just can be used to change the rotating speed of CD-ROM drive.
Known optical disc reduces the method for rotating speed now, normally cooperates its vibration situation of software detection or inclined to one side rail situation with mechanism, handles but must increase extra testing circuit; Another kind of method of carrying out with software merely, as shown in Figure 1, it is control chip by CD driver, per 10 milliseconds (ms) detect the state of the ESC Escape of CD-ROM drive, and signal is low (low) when pinning for height (high) when suppose that the ESC Escape end is pressed, at first CD-ROM drive is preset as doubly speed 10 of low transmission during use, does at this moment, timer make zero 11, and detects ESC Escape and be pressed and do not put 12?
If not, then get back to step 12, continue to detect; If pick up counting with Active Timer to this control chip just this ESC Escape is exported one low (low) signal, and whether the timing of inspection timer above five seconds 13?
If not, then be considered as pushing of traditional ESC Escape, carry out and withdraw from action 14, and get back to step 11:
Otherwise, this control chip drives the light emitting diode (LED) on the CD-ROM drive, make LED flash with the prompting handover success, and CD-ROM drive switches to doubly speed 15 of high-transmission, it is the available maximum (top) speed of CD-ROM drive itself, when the user pushed ESC Escape in a conventional manner, this CD-ROM drive was just carried out and is withdrawed from action, and recovered original low power speed transmission.
But, above-mentioned steps need be quite inconvenience by personnel's action.So as from the foregoing, above-mentioned known decision CD-ROM drive reduces the method for rotating speed, on reality is used, obviously have inconvenience and exist, and remain to be improved with shortcoming.
In order to improve known above-mentioned every shortcoming, fundamental purpose of the present invention is initiatively to determine the rotating speed of CD-ROM drive, noise and the power wastage of avoiding unnecessary high rotating speed to cause according to operating system or the application program speed to the CD-ROM drive order.
In order to reach above-mentioned purpose, the present invention is providing a kind of method by system's detection decision CD speed, and it mainly comprises the following steps:
A. from operating system or application program, receive reading command, to learn the block counts (N that reads
n) and the time value (T that begins to read
Sn);
B. the block counts N that the last time is read
N-1, the last time value T that reads of finishing
En-1And this time value (T that begins to read
Sn) do computing, operate required reading speed (X) up till now to get;
C. judge whether this reading speed (X) is greater than or less than the reading speed of present CD-ROM drive, then write down number of times if meet: and
D. if this number of times then repeats above-mentioned steps a then improves or reduce CD-ROM drive greater than this critical value up to this number of times to step c rotating speed less than-critical value.
Described method by system's detection decision CD speed, wherein the expression formula of this step b is
X＝N
n-1[75×(T
sn-T
en-1)]；
Described method by system's detection decision CD speed, wherein the critical value of this steps d changes the inferior numerical value of rotating speed for allowing CD-ROM drive.
So, detect the method that determines CD speed by of the present invention by system, need not increase additional circuit, also need not pass through external force, just can reach the purpose that CD player determines rotating speed automatically, avoid the consumption of high noisy and electric power, and obtained preferable operational paradigm.
Reach technology, means and the effect that predetermined purpose is taked in order further to understand the present invention, see also following about detailed description of the present invention and accompanying drawing, believe purpose of the present invention, feature and characteristics, when obtaining thus deeply and concrete understanding, yet institute's accompanying drawing only provides reference and explanation usefulness, is not to be used for the present invention is limited.
Fig. 1 is the action flow chart that known CD-ROM drive reduces rotating speed.
Fig. 2 is an action flow chart of the present invention.
See also shown in Figure 2ly, be action flow chart of the present invention.The present invention is a kind of method that is detected the decision CD speed by system, because CD-ROM drive reads 75 blocks at one times of per second when fast, two times of per seconds when fast read 150 blocks, the rest may be inferred by analogy for it, hence one can see that, and after operation system of computer read N block for reading command of CD-ROM drive, giving the time interval of the reading command of CD-ROM drive to the next one was that T is during second, available-the required doubly fast X of data read of expression formula estimation operation, this expression formula is X=N/ (75 * T).
So, as long as with the speed setting of CD-ROM drive in the demand that can satisfy computer operating system than X slightly greatly, therefore can get following step:
Step 20: set in advance greater than inferior numerical value A of the reading speed of CD-ROM drive at present and be 0 and be 0 less than the inferior numerical value B of the reading speed of present CD-ROM drive.
Step 21: from operating system or application program, receive reading command, to learn the block counts N that reads
nAnd the time value T that begins to read
Sn:
Step 22: the block counts N that the last time is read
N-1The time value T that last end is read
En-1With this time value T that begins to read
SnDo computing, operate required reading speed X up till now to get, and X=N
N-1/ [75 * (T
Sn-T
En-1)];
Step 23: is this reading speed X greater than the reading speed of present CD-ROM drive?
If not, then skip to step 29:
If then enter step 24:
Step 24:A=A+1:
Does is step 25:A greater than critical value (this critical value change the inferior numerical value of rotating speed for allowing CD-ROM drive)?
If not, then skip to step 27:
If then enter step 26:
Step 26: improve the reading speed of CD-ROM drive, and A is made as 0 again.
Step 27: from the CD-ROM drive reading of data.
Step 28: passback data and each state are given operating system or application program, and the time value of this end is recorded as T
En, and get back to step 21.
Step 29: is this reading speed X less than the reading speed of present CD-ROM drive? if not, then skip to step 27, it is identical with the reading speed of present CD-ROM drive that required reading speed X is operated in expression.
If then enter step 30;
Step 30:B=B+1:
Whether step 31:B is greater than critical value.
If not, then skip to step 27:
If then enter step 32:
Step 32: reduce the reading speed of CD-ROM drive, and B is made as 0 again, and skip to step 27.
In view of the above, CD-ROM drive is not to be subjected to the difference of result of calculation at any time and to change rotating speed, but the inferior numerical value of reading speed that ought be greater than or less than present CD-ROM drive continuously is greater than critical value, and just change can reach its stability, and the preferable setting value of critical value is 10～20 times.
But, the above, only be the detailed description of the specific embodiment of one of the best of the present invention and graphic, and feature of the present invention is not limited thereto, be not in order to restriction the present invention, all scopes of the present invention should be as the criterion with following Patent right requirement scope, all embodiment that meets the spirit variation similar of the present patent application claim with it, all should be contained in the category of the present invention, any people who is familiar with this technology in the field of the invention, can think easily and variation or modify all can be encompassed in the scope of claim of the present invention.
Claims (3)
1. one kind is detected the method for decision CD speed by system, and it comprises the following steps:
A. from operating system or application program, receive reading command, to learn the block counts (N that reads
n) and the time value (T that begins to read
Sn);
B. the block counts N that the last time is read
N-1, the last time value T that reads of finishing
En-1And this time value (T that begins to read
Sn) do computing, operate required reading speed (X) up till now to get;
C. judge whether this reading speed (X) is greater than or less than the reading speed of present CD-ROM drive, then write down number of times if meet: and
D. if this number of times then repeats above-mentioned steps a then improves or reduce CD-ROM drive greater than this critical value up to this number of times to step c rotating speed less than-critical value.
2. the method by system's detection decision CD speed as claimed in claim 1, wherein the expression formula of this step b is
X＝N
n-1[75×(T
sn-T
en-1)]；
3. the method by system's detection decision CD speed as claimed in claim 1, wherein the critical value of this steps d changes the inferior numerical value of rotating speed for allowing CD-ROM drive.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01118109 CN1280814C (en) | 2001-05-16 | 2001-05-16 | Method for determining CD speed by system detection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01118109 CN1280814C (en) | 2001-05-16 | 2001-05-16 | Method for determining CD speed by system detection |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1385852A true CN1385852A (en) | 2002-12-18 |
| CN1280814C CN1280814C (en) | 2006-10-18 |
Family
ID=4662974
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01118109 Expired - Fee Related CN1280814C (en) | 2001-05-16 | 2001-05-16 | Method for determining CD speed by system detection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1280814C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7710836B2 (en) | 2004-03-03 | 2010-05-04 | Hui-Chih Lin | Method and apparatus for controlling data access rate of an optical disc driver |
| CN101473377B (en) * | 2006-06-20 | 2011-07-27 | 皇家飞利浦电子股份有限公司 | Devices and methods for determining a critical rotation speed of an optical data carrier, monitoring a condition of an optical data carrier, and generating a reference signal |
| CN101577121B (en) * | 2005-11-28 | 2012-04-18 | 日立乐金资料储存股份有限公司 | Optical disc apparatus and information recording and reproducing method |
-
2001
- 2001-05-16 CN CN 01118109 patent/CN1280814C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7710836B2 (en) | 2004-03-03 | 2010-05-04 | Hui-Chih Lin | Method and apparatus for controlling data access rate of an optical disc driver |
| US8228766B2 (en) | 2004-03-03 | 2012-07-24 | Tian Holdings, Llc | Method and apparatus for controlling data access rate of an optical disc driver |
| CN101577121B (en) * | 2005-11-28 | 2012-04-18 | 日立乐金资料储存股份有限公司 | Optical disc apparatus and information recording and reproducing method |
| CN101473377B (en) * | 2006-06-20 | 2011-07-27 | 皇家飞利浦电子股份有限公司 | Devices and methods for determining a critical rotation speed of an optical data carrier, monitoring a condition of an optical data carrier, and generating a reference signal |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1280814C (en) | 2006-10-18 |
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| SE01 | Entry into force of request for substantive examination | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20061018 Termination date: 20140516 |