CN1983416B - Method for discriminating disk data orbital distance - Google Patents
Method for discriminating disk data orbital distance Download PDFInfo
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- CN1983416B CN1983416B CN2005101316229A CN200510131622A CN1983416B CN 1983416 B CN1983416 B CN 1983416B CN 2005101316229 A CN2005101316229 A CN 2005101316229A CN 200510131622 A CN200510131622 A CN 200510131622A CN 1983416 B CN1983416 B CN 1983416B
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- China
- Prior art keywords
- data
- gauge
- discrimination
- orbital distance
- eigenwert
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Abstract
A method for judging track gauge of optical disc data includes utilizing phase-locked loop to measure out data transmission frequency at preset data section position on an optical disc i.e. feature value, querying a feature value list and utilizing interpolation or approximate means to calculate out track gauge of optical disc.
Description
Technical field
The present invention relates to a kind of method of discrimination of disk data orbital distance, particularly utilize data transmission frequency values or bearing tachometer value to measure the method for discrimination of the disk data orbital distance of CD gauge.
Background technology
Some traditional CD dwindles standard gauge increasing capacity of optical storage, chooses sheet for avoiding CD-ROM drive erroneous judgement or kind that can't the interpretation CD to produce.The method of traditional measurement CD gauge is the CD (supposing that gauge is d) to unknown gauge, reads fixed data segment length X, then a reading of data area A=Xd.See by another side, if the radius of fixed data segment length X starting point is R
S, the radius of terminal point is R
E, then the annulus area of fixed data segment length X can be expressed as the data area in addition
, by aforementioned two equal areas A, push away gauge
。Yet, must detect the starting point radius R according to the gained formula
SWith the terminal point radius R
EJust can calculate CD gauge d.The method that adopts detection radius at present is to utilize rotation disc one circle, detects disc data frame number conversion circumference, is converted into institute's respective radius length again.The shortcoming of this method is that radius length is difficult for accurately and facility obtains, because data framework is counted the degree of stability that correctness depends on the whole segment data decoding of this rail.And obtaining of gauge need through a series of conversion, and the degree of accuracy of each time conversion all can have influence on the error degree and the computational complexity of gauge.Therefore, how to simplify the measurement of CD gauge, make the result more direct accurately, also more convenient obtaining simultaneously, will be the CD-ROM drive dealer bear in mind always look forward to.
Summary of the invention
Purpose of the present invention is providing a kind of method of discrimination of data orbital distance, by setting up data transmission frequency data or bearing tachometer value data, measure the data transmission frequency values or the bearing tachometer value of CD, cooperate interpolation method or method of approximation to calculate this optical disc data gauge, save prior art and need detect the starting point radius R
SWith the terminal point radius R
EChanged the shortcoming that just can obtain gauge again.
Another purpose of the present invention under alignment speed, is measured the bearing tachometer value of CD in that a kind of method of discrimination of data orbital distance is provided, and fitted bearing tachometer value data calculate this CD gauge.
Another object of the present invention under the constant angular velocity rate, is measured the data transmission frequency values of CD in that a kind of method of discrimination of data orbital distance is provided, and cooperates the data transmission frequency data, calculates this CD gauge.
In order to reach the purpose of aforementioned invention, a kind of method of discrimination of disk data orbital distance, comprise the following steps: to utilize existing data phaselocked loop or speed detector in the CD-ROM drive, respectively under the situation of constant angular velocity rate and alignment speed, measure the data transmission frequency values or the bearing tachometer value of a CD tentation data fragment position, be eigenwert, then relation data of query characteristics value and gauge, and cooperation interpolation method or method of approximation calculate the CD gauge.
Description of drawings
Fig. 1 a, 1b are CD gauge of the present invention and data area synoptic diagram.
Fig. 2 is the corresponding data figure of first embodiment of the invention gauge value and data transmission frequency.
Fig. 3 is that the fixed angular speed of first embodiment of the invention is measured CD gauge process flow diagram down.
The corresponding data figure of Fig. 4 second embodiment of the invention gauge value and bearing rotating speed
Fig. 5 measures CD gauge process flow diagram under the alignment speed of the present invention.
The reference numeral explanation
| 1a, |
11,16 |
|
| 12,17 data segment |
13, eighteen data segment endpoint radius | |
| Step 21 beginning | ||
| The motion of |
Step 23 is jumped onto the tracks to tentation data section x position | |
| Step 24 data phaselocked loop detects the data transmission frequency values | The tabulation of step 25 data query transmission frequency; Utilize interpolation or method of approximation to obtain data orbital distance | |
| Step 26 | Step | 31 beginning |
| The motion of | Step | 33 is jumped onto the tracks to tentation data section |
| Step | ||
| 34 speed detector draws the bearing tachometer value | The tabulation of | |
| Step | ||
| 36 finishes |
Embodiment
Relevant the present invention is for reaching above-mentioned purpose, and technological means that is adopted and effect thereof are lifted preferred embodiment now, and conjunction with figs. is illustrated as follows.
Please refer to Fig. 1 a, CD gauge of the present invention and data area synoptic diagram.The gauge of CD 1a is d1, include the data segment 11 (launching data segment 11) of a length x as the length x among the figure, these data segment 11 starting point radiuses 12 length are Rs, it is the data field inner edge radius that the CD specifications are formulated, and data segment 11 terminal point radiuses 13 length are R1, and data segment 11 forms a data segment area A 1.Because data segment 11 area A 1 are for the length x of data segment 11 is multiplied by CD gauge d1, i.e. A1=xd1.Simultaneously, if calculate with optical disc data section 11 starting point radius length Rs and terminal point radius length R1, then data segment area A 1 is π (R1
2-Rs
2), i.e. area A 1=xd1=π (R1
2-Rs
2), obtain gauge d1=π (R1
2-Rs
2)/x.In like manner, among Fig. 1 b, the gauge of CD 1b is d2, include the data segment 16 (launching data segment 16) of a length x as the length x among the figure, these data segment 16 starting point radiuses 17 length are Rs, i.e. the data field inner edge radius formulated of CD specifications, and data segment 16 terminal point radiuses 18 length are R2, form a data segment area A 2, its data segment area A 2=xd2=π (R2
2-Rs
2), obtain gauge d2=π (R2
2-Rs
2)/x.
Therefore, compare with CD 1b with regard to CD 1a, when two groups of optical disc data sections 11 and 16 length are all x, and during the inner edge radius of starting point radius R s is all that the CD specifications are formulated data field, because data segment area A 1 is (xd1), data segment area A 2 is (xd2), if gauge d1 is greater than gauge d2, then data segment area A 1 is greater than data segment area A 2, i.e. π (R1
2-Rs
2)＞π (R2
2-Rs
2).Because data segment 11 and 16 starting point radiuses 12 and 17 length are all Rs, push away R1＞R2; So two CDs of different pieces of information gauge have different radii in identical data section x position, the bigger radius of CD correspondence of big gauge, the radius that the CD of little gauge is corresponding less.
The first embodiment of the present invention, be utilize CD-ROM drive the constant angular velocity rate (Constant AngularVelocity, under operation mode CAV), just CD-ROM drive is with the same rotational speed rotating disc, the bigger CD of gauge has bigger wire rate longer with the pairing radius in data segment x position.Because the CD-ROM drive read head is when the data of optical disk imprinting signal that reads, the data phaselocked loop can produce the clock pulse of the data of optical disk imprinting signal Synchronization that is read with read head.The data carving signal that reads of CD-ROM drive unit interval is represented the CD arc length that the CD-ROM drive unit interval reads, and also represents CD at the wire rate that is read a little simultaneously, and its wire rate can be tried to achieve with the data transmission frequency values of measuring this position.Therefore, the size of its frequency values can reflect wire rate and change.So, utilize the CD of some known gauges, in a predetermined identical data section x position, under constant angular velocity rate (CAV) pattern, can write down its data transmission frequency values, as shown in Figure 2, make the data transmission frequency data that index with the gauge value.
The CD of unknown gauge is by the eigenwert of measuring tentation data section x position, it is the data transmission frequency value F under the constant angular velocity rate, by the data of gauge value and data transmission frequency correspondence, data query transmission frequency data cooperate interpolation method or method of approximation can obtain its gauge size D again.
Please refer to Fig. 3, the angular speed that waits of present embodiment is measured CD gauge process flow diagram down, and its step is described as follows:
Step 21: beginning CD player running;
Step 22: CD-ROM drive carries out the motion of constant angular velocity rate;
Step 23: the data segment x position that read head is jumped onto the tracks and detected to predetermined;
Step 24: utilize the data phaselocked loop to detect the data transmission frequency values of the predetermined data segment x position of detecting; Step 25: the resulting data transmission frequency values of step 24 is compared with data transmission frequency data, utilize interpolation method or method of approximation to obtain data orbital distance; Step 26: finish
Therefore, the data transmission frequency data that the present invention is set up by known gauge CD, the data phaselocked loop that utilizes CD-ROM drive to have is not increasing under the cost, and a simple and easy method of discrimination is provided, and calculates this CD gauge with interpolation method and method of approximation.And the degree of accuracy of data phaselocked loop is not second to detection disc data frame number, but computational complexity and cost are but very low.In like manner, aforementioned data transmission frequency data of setting up can also the data transmission frequency be made tabulation to gauge, calculate this CD gauge with interpolation method and method of approximation.
The second embodiment of the present invention, be to utilize alignment speed (Constant Liniar Velocity, CLV) under the operation mode, just CD-ROM drive is with the rotational speed CD of variation, allow each data place of CD have identical wire rate, then with data segment x position, have less angular speed in the bigger CD of gauge, that is the rotating speed of CD-ROM drive is less; And the CD speed pick-up unit is to utilize electromagnetic induction or light path Shader, the CD-ROM drive bearing is revolved turn around to send predetermined a plurality of pulse signals, uses to measure CD-ROM drive bearing tachometer value and react angular speed and change situation.Therefore, as shown in Figure 4, utilize the CD of some known gauges,, under alignment speed (CLV) pattern, write down its bearing tachometer value respectively, make the bearing tachometer value data that index with the gauge value in a predetermined identical data section x position.
The CD of unknown gauge is by the eigenwert of measuring tentation data section x position, and promptly the bearing tachometer value R under the alignment speed by the data of gauge value and bearing rotating speed correspondence, inquires about the bearing tachometer value, cooperates interpolation method or method of approximation can obtain its gauge size D again.
Please refer to Fig. 5, the wire rate that waits of the present invention is measured CD gauge process flow diagram down, and its step is described as follows:
Step 31: beginning CD player running;
Step 32: CD-ROM drive carries out the motion of alignment speed;
Step 33: read head is jumped onto the tracks to tentation data section x position;
Step 34: utilize speed detector to detect the bearing tachometer value of tentation data position, be equal to the angular speed that detects this position;
Step 35: the resulting bearing tachometer value of step 34 is compared with a bearing tachometer value tabulation, utilize interpolation method or method of approximation to obtain data orbital distance;
Step 36: finish.
Therefore, present embodiment utilizes the data phaselocked loop and the speed detector of CD-ROM drive indispensability, is not increasing under the cost, and a simple and easy method of discrimination is provided.The degree of accuracy of data phaselocked loop is not second to detection disc data frame number, but computational complexity and cost are but very low.The also bearing tachometer value tabulation of being set up by known gauge CD, the bearing rotating speed of the unknown gauge CD of conjunction measuring can calculate this CD gauge with interpolation method and method of approximation.Facing some non-regulation gauge discs, the invention provides a kind of sheet mechanism of declaring fast, allow the research staff be adopted this method to promote this usefulness of special.Therefore the present invention possesses the desired novelty of patent of invention, progressive and industry applications really, so file an application in accordance with the law.
The above person only is that scope of the present invention is not limited to these preferred embodiments, and is all according to any change that the present invention did, and not breaking away under the spirit of the present invention, all belongs to the scope of the present patent application patent in order to convenient explanation preferred embodiment of the present invention.
Claims (10)
1. the method for discrimination of a disk data orbital distance comprises the following steps:
Measure an eigenwert of a CD tentation data fragment position;
Inquire about the relation data of an eigenwert and gauge; And
Cooperate interpolation method or method of approximation to calculate this CD gauge.
2. the method for discrimination of a kind of disk data orbital distance as claimed in claim 1, wherein, this eigenwert is a data transmission frequency values.
3. the method for discrimination of a kind of disk data orbital distance as claimed in claim 2, wherein, this data transmission frequency values is to utilize a data phaselocked loop to detect and get.
4. the method for discrimination of a kind of disk data orbital distance as claimed in claim 2, wherein, the relation data of this eigenwert and gauge is the CD that utilizes known gauge, at an identical tentation data fragment position place, under constant angular velocity rate pattern, write down this data transmission frequency values respectively, make the data transmission frequency data that index with the gauge value.
5. the method for discrimination of a kind of disk data orbital distance as claimed in claim 1, wherein, this eigenwert is a bearing tachometer value.
6. the method for discrimination of a kind of disk data orbital distance as claimed in claim 5, wherein, this bearing tachometer value utilizes a speed detector to detect and gets.
7. the method for discrimination of a kind of disk data orbital distance as claimed in claim 5, wherein, the relation data of this eigenwert and gauge is the CD that utilizes known gauge, at an identical tentation data fragment position place, under the alignment rate mode, write down this bearing tachometer value respectively, make the bearing tachometer value data that index with the gauge value.
8. the method for discrimination of a kind of disk data orbital distance as claimed in claim 1, wherein, the relation data of this eigenwert and gauge is one to comprise the tabulation of gauge and data transmission frequency corresponding data.
9. the method for discrimination of a kind of disk data orbital distance as claimed in claim 1, wherein, the relation data of this eigenwert and gauge is one to comprise the tabulation of gauge and bearing tachometer value corresponding data.
10. the method for discrimination of a kind of disk data orbital distance as claimed in claim 1, wherein, the starting point of the CD tentation data fragment position that this is measured is the data field inner edge that the CD specifications are formulated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2005101316229A CN1983416B (en) | 2005-12-15 | 2005-12-15 | Method for discriminating disk data orbital distance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2005101316229A CN1983416B (en) | 2005-12-15 | 2005-12-15 | Method for discriminating disk data orbital distance |
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| Publication Number | Publication Date |
|---|---|
| CN1983416A CN1983416A (en) | 2007-06-20 |
| CN1983416B true CN1983416B (en) | 2011-01-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2005101316229A Expired - Fee Related CN1983416B (en) | 2005-12-15 | 2005-12-15 | Method for discriminating disk data orbital distance |
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| Country | Link |
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| CN (1) | CN1983416B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102194484A (en) * | 2010-03-10 | 2011-09-21 | 凌阳科技股份有限公司 | Method for discriminating track distance of compact disc |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5047999A (en) * | 1987-08-17 | 1991-09-10 | U.S. Philips Corporation | Optical record carrier reader calculating track pitch and write velocity for locating read point |
| CN1475995A (en) * | 2002-08-14 | 2004-02-18 | 联发科技股份有限公司 | Correction device and method of spacing btween linear velocity and rail |
| CN1553438A (en) * | 2003-06-05 | 2004-12-08 | 华硕电脑股份有限公司 | Detecting method and system for disc track gauge of optical driver |
-
2005
- 2005-12-15 CN CN2005101316229A patent/CN1983416B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5047999A (en) * | 1987-08-17 | 1991-09-10 | U.S. Philips Corporation | Optical record carrier reader calculating track pitch and write velocity for locating read point |
| CN1475995A (en) * | 2002-08-14 | 2004-02-18 | 联发科技股份有限公司 | Correction device and method of spacing btween linear velocity and rail |
| CN1553438A (en) * | 2003-06-05 | 2004-12-08 | 华硕电脑股份有限公司 | Detecting method and system for disc track gauge of optical driver |
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| Publication number | Publication date |
|---|---|
| CN1983416A (en) | 2007-06-20 |
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Granted publication date: 20110126 Termination date: 20111215 |