CN101650950B - Method and device for detecting rotation speed of recording medium - Google Patents
Method and device for detecting rotation speed of recording medium Download PDFInfo
- Publication number
- CN101650950B CN101650950B CN2009101775586A CN200910177558A CN101650950B CN 101650950 B CN101650950 B CN 101650950B CN 2009101775586 A CN2009101775586 A CN 2009101775586A CN 200910177558 A CN200910177558 A CN 200910177558A CN 101650950 B CN101650950 B CN 101650950B
- Authority
- CN
- China
- Prior art keywords
- bank
- hole
- recording medium
- unit
- rotating speed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Optical Recording Or Reproduction (AREA)
Abstract
The invention discloses a method for detecting the rotation speed of a recording medium, which comprises the following steps: S1, sampling pits and banks of a rotating recording medium; S2, confirming the time T for sampling A pits and banks, wherein A is a preset constant value; S3, confirming the run length C of the A pits and banks according to the occurrence probability and the run length of different lengths of pits and banks; S4, confirming the run physical length L of the A pits and banks according to the physical length of the unit run and the run length C of the A pits and banks; and S5, confirming the rotation speed of the recording medium according to the run physical length L and the time T for sampling the A pits and banks. The invention also discloses a device for detecting the rotation speed of the recording medium. The invention can realize the rotation-speed readout of data recording mediums of a constant line speed channel bit, a recording frame structure and a recording-less frame structure, and the rotation speed of the recording medium can be measured at any rotation speeds.
Description
Technical field
The present invention relates to the digital storage technique field, particularly relate to a kind of linear speed channel bit that weighs, when the recording medium rotation reading of data of record frame structure and no record frame structure is arranged, the detection method and the device of the tunnel shore time length of channel bit time span, each length and recording medium rotating speed.
Background technology
Existing digital storage technique all is that information translation is become binary data, and certain modulation system is corresponding with two kinds of different physical states of storage medium recorded symbol according to this with binary number, realizes data storage, and this class storage mode is called the two-value storage.What present read-only optical disc memory technology was adopted all is the two-value storage mode, according to the height of reflected light light intensity judge current pairing position be " hole " (Pit) or " bank " (Land), can write down two status numbers on each record cell, just the information of just in time corresponding 1 (bit).
The recording medium that is rotated reading of data needs the rotating speed of recording medium is calculated before recovering carrying out signal, conventional recording medium tachometry is the rotating speed of recording medium need be controlled within certain scope, determine the scope of frame head sampled point number again by this scope, extract frame head then, calculate the recording medium rotational speed.
But the assay method of prior art only is confined to detect with the rotational speed of the data carrier of frame head, and has the rotational velocity range of recording medium to have certain limitation.
Summary of the invention
The problem to be solved in the present invention provides a kind of detection method and device of rotating speed of recording medium, realizing weighing apparatus linear speed channel bit, to have the rotating speed of the data carrier of record frame structure and no record frame structure to read, and recording medium can both be measured its recording medium rotational speed under any rotational speed.
For achieving the above object, technical scheme of the present invention provides a kind of detection method of rotating speed of recording medium, said method comprising the steps of S1, and the hole and the bank of recording medium of rotation sampled; S2 determines A hole of sampling and the used time T of bank, and described A is predefined constant value; S3 according to the hole of all lengths and probability and the hole of all lengths and the run length of bank of bank appearance, determines the run length C of A hole and bank; S4 according to the run length C of the physical length of the unit distance of swimming and described A hole and bank, determines that A is cheated and the distance of swimming physical length L of bank; S5 according to described distance of swimming physical length L and A hole of sampling and the used time T of bank, determines the rotating speed of recording medium.
Wherein, step S2 specifically comprises: determine that A hole of sampling and the used sampling clock number of bank are B, the sampling clock cycle is t, and A hole and the used time T=B * t of bank then sample.
Wherein, step S2 specifically comprises S31, according to modulation coding mode, obtains the hole of all lengths and the probability I that bank occurs
a, I
b..., I
xS32 according to modulation coding mode, obtains the hole of all lengths and the run length a of bank, b ..., x; S33 is according to formula C=a * A * I
a+ b * A * I
b+ ...+x * A * I
x, determine A the hole and the run length C of bank.
Wherein, step S4 specifically comprises: according to formula L=C * l=(a * A * I
a+ b * A * I
b+ ...+x * A * I
x) * l determines A the hole and the distance of swimming physical length L of bank, and wherein l is the physical length of the unit distance of swimming.
Wherein, step S5 specifically comprises: according to formula v=L ÷ T=(a * A * I
a+ b * A * I
b+ ...+x * A * I
x) * l ÷ (B * t), determine the rotating speed v of recording medium.
Wherein, after step S3, further comprising the steps of S6 is according to the formula M=T ÷ C=(÷ (a * A * I of B * t)
a+ b * A * I
b+ ...+x * A * I
x), the time span M of the unit's of obtaining channel bit.
Wherein, after step S6, also comprise: obtain the time span a * M of each hole and bank, b * M ..., x * M.
Technical scheme of the present invention also provides a kind of pick-up unit of rotating speed of recording medium, and described device comprises: sampling unit is used for the hole and the bank of recording medium of rotation sampled; The sampling time acquiring unit is used for determining A hole of sampling and the used time T of bank, and described A is predefined constant value; The run length acquiring unit is used for determining the run length C of A hole and bank according to the hole of all lengths and probability and the hole of all lengths and the run length of bank of bank appearance; Distance of swimming physical length acquiring unit is used for physical length and the definite run length C of run length acquiring unit according to the unit distance of swimming, determines the distance of swimming physical length L of A hole and bank; The rotating speed acquiring unit is used for distance of swimming physical length L and the sampling time acquiring unit definite sampling time T definite according to distance of swimming physical length acquiring unit, determines the rotating speed of recording medium.
Wherein, described device also comprises: the time span acquiring unit of unit channel bit is used for run length C and the sampling time acquiring unit definite sampling time T definite according to the run length acquiring unit, the time span M of the unit's of obtaining channel bit.
Wherein, described device also comprises: the tunnel shore time length acquiring unit is used for time span M and the hole of all lengths and the run length of bank of the unit channel bit that the time span acquiring unit according to the unit channel bit obtains, obtain the time span a * M of each hole bank, b * M ..., x * M.
Compared with prior art, technical scheme of the present invention has following advantage:
The present invention not only can realize weighing the linear speed channel bit, have the rotating speed of data carrier of the recording medium of record frame structure to read, and the rotating speed of the recording medium of can realize weighing linear speed channel bit, no record frame structure reads; In addition, in the present invention, recording medium can both be measured its recording medium rotational speed under any rotational speed.
Description of drawings
Fig. 1 is the process flow diagram of detection method of rotating speed of a kind of recording medium of the embodiment of the invention;
Fig. 2 is the synoptic diagram of the sampling number statistics effect of weighing apparatus 500 holes of linear speed channel bit and bank in the embodiment of the invention.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples are used to illustrate the present invention, but are not used for limiting the scope of the invention.
The present invention is example with DVD5, the recording medium of weighing apparatus linear speed channel bit is rotated situation about reading describes under unknown speed, and the detection method of the rotating speed of a kind of recording medium of the embodiment of the invention may further comprise the steps as shown in Figure 1:
Step s101 samples to the hole and the bank of recording medium of rotation.
Step s102 determines A hole of sampling and the used time T of bank, and described A is predefined constant value.Has randomicity characteristics owing to passed through the data of scramble before the modulating-coding, so the probability that each length hole and bank occur is fixed, so given suitable constant A, on the recording medium continuously in the constant A hole bank, the probability that each length hole and bank occur is to cheat and the probability of bank appearance near each length in the modulating-coding theory.Setting for constant A: the probability I that the hole of all lengths and bank occur
a, I
b..., I
xObtain by modulating-coding, if the value of constant A is big more, then in A hole and the bank hole of each length or bank number divided by the value of A more near the hole of each length and the probability I of bank correspondence
a, I
b..., I
xOtherwise when A was 1, the hole of each length or bank number were divided by the hole and the corresponding probability I of bank of value with each length of A in A hole and the bank
a, I
b..., I
xDifference maximum (having only a value is 1, and other is 0 entirely).So, the value of A satisfy system can tolerance range within the time, that should try one's best is big.The predefined constant value A that adopts in the present embodiment is 500, the synoptic diagram of the sampling number statistics effect of weighing apparatus 500 holes of linear speed channel bit and bank as shown in Figure 2, as can be seen from Figure 2, sample the used sampling clock number of 500 holes and bank near 8900, wherein the clock period is t, and 500 holes and the used time T=8900 * t of bank obtain sampling.
Step s103 according to the hole of all lengths and probability and the hole of all lengths and the run length of bank of bank appearance, determines the run length C of A hole and bank.The probability that the hole of all lengths and bank occur is determined by modulation coding mode, because the data before the modulating-coding have the randomness characteristics, modulating-coding come out the probability of the distance of swimming (be various length hole and bank) of all lengths fix, so the probability that the hole of all lengths and bank occur is determined by the mode of modulating-coding; The hole of all lengths and the run length of bank also determined by modulation coding mode, and for example we know that its run length has: 3T, 4T according to the modulating-coding of DVD5,5T, 6T, 7T, 8T, 9T, 10T, 11T, (T is single channel bit to 14T, be a unit run length, the physical length of the 3T of DVD5 is 400 nanometers, and promptly single channel bit length is 400 ÷ 3=133.33 nanometers).In the present embodiment, suppose that the hole of all lengths and the probability that bank occurs are I
a, I
b..., I
x, the hole of all lengths and the run length of bank are a, b ..., x, then the run length C=a * A * I of 500 holes and bank
a+ b * A * I
b+ ...+x * A * I
x
Step s104, the time span of the unit's of obtaining channel bit.In the present embodiment, according to formula M=C ÷ T=(a * 500 * I
a+ b * 500 * I
b+ ...+x * 500 * I
x) ÷ (8900 * t), the time span M of the unit's of obtaining channel bit, wherein C is the run length of 500 holes and bank, T is 500 holes of sampling and used time of bank.
Step s105, time span M and the hole of all lengths and the run length a of bank of the unit channel bit of obtaining according to the time span acquiring unit of unit channel bit, b ..., x obtains the time span a * M of each hole and bank, b * M ..., x * M.
Step s106 according to the run length C of the physical length of the unit distance of swimming and A hole and bank, determines that A is cheated and the distance of swimming physical length L of bank.In the present embodiment, according to formula L=C * l=(a * 500 * I
a+ b * 500 * I
b+ ...+x * 500 * I
x) * l determines the distance of swimming physical length L of 500 holes and bank, and wherein l is the physical length of the unit distance of swimming, i.e. the physical length of unit channel bit, and C is the run length of 500 holes and bank.
Step s107 according to distance of swimming physical length L and A hole of sampling and the used time T of bank, determines the rotating speed of recording medium.In the present embodiment, the valid data number of supposing 500 holes and bank is D, then the speed S=D ÷ T=D ÷ of reading ﹠ recording medium valid data (8900 * t), the rotating speed v=L ÷ T=(a * 500 * I of the recording medium of weighing apparatus linear speed channel bit
a+ b * 500 * I
b+ ...+x * 500 * I
x) * l ÷ (8900 * t).
In embodiments of the present invention, owing to be tunnel shore time length value and the recording medium tachometer value that per 500 holes and bank just calculate one group of channel bit time span value, each length.In order to reduce the error of final value and actual value, the present invention can carry out many groups channel bit time span value of calculating continuously, the tunnel shore time length value and the recording medium tachometer value of each length the mean filter denoising and finally obtain more approaching real value.
When the detection of the rotating speed that carries out recording medium shown in Figure 1, the pick-up unit of the rotating speed of a kind of recording medium of the embodiment of the invention comprise sampling unit, sampling time acquiring unit, run length acquiring unit, distance of swimming physical length acquiring unit, unit channel bit the time span acquiring unit: tunnel shore time length acquiring unit and rotating speed acquiring unit.
Sampling unit is used for the hole and the bank of the recording medium of rotation are sampled; The sampling time acquiring unit is used for determining A hole of sampling and the used time T of bank, and described A is predefined constant value; The run length acquiring unit is used for probability and the hole of all lengths and the run length of bank according to the hole of all lengths and bank appearance, determines the run length C of A hole and bank; Distance of swimming physical length acquiring unit is used for determining the distance of swimming physical length L of A hole and bank according to the physical length of the unit distance of swimming and the definite run length C of run length acquiring unit; The time span acquiring unit of unit channel bit is used for run length C and the sampling time acquiring unit definite sampling time T definite according to the run length acquiring unit, the time span M of the unit's of obtaining channel bit; The tunnel shore time length acquiring unit is used for time span M and the hole of all lengths and the run length of bank of the unit channel bit that the time span acquiring unit according to the unit channel bit obtains, and obtains the time span a * M of each hole bank, b * M ..., x * M; The rotating speed acquiring unit is used for distance of swimming physical length L and the sampling time acquiring unit definite sampling time T definite according to distance of swimming physical length acquiring unit, determines the rotating speed of recording medium.
The present invention not only can realize weighing the linear speed channel bit, have the rotating speed of data carrier of the recording medium of record frame structure to read, and the rotating speed of the recording medium of can realize weighing linear speed channel bit, no record frame structure reads; In addition, in the present invention, recording medium can both be measured its recording medium rotational speed under any rotational speed.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the technology of the present invention principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. the detection method of the rotating speed of a recording medium is characterized in that, said method comprising the steps of:
S1 samples to the hole and the bank of recording medium of rotation;
S2 determines A hole of sampling and the used time T of bank, and described A is predefined constant value;
S3 according to the hole of all lengths and probability and the hole of all lengths and the run length of bank of bank appearance, determines the run length C of A hole and bank;
S4 according to the run length C of the physical length of the unit distance of swimming and described A hole and bank, determines that A is cheated and the distance of swimming physical length L of bank;
S5 according to described distance of swimming physical length L and A hole of sampling and the used time T of bank, determines the rotating speed of recording medium.
2. the detection method of the rotating speed of recording medium as claimed in claim 1 is characterized in that, step S2 specifically comprises: determine that A hole of sampling and the used sampling clock number of bank are B, the sampling clock cycle is t, and A hole and the used time T=B * t of bank then sample.
3. the detection method of the rotating speed of recording medium as claimed in claim 2 is characterized in that, step S2 specifically comprises:
S31 according to modulation coding mode, obtains the hole of all lengths and the probability I that bank occurs
a, I
b..., I
x
S32 according to modulation coding mode, obtains the hole of all lengths and the run length a of bank, b ..., x;
S33 is according to formula C=a * A * I
a+ b * A * I
b+ ...+x * A * I
x, determine A the hole and the run length C of bank.
4. the detection method of the rotating speed of recording medium as claimed in claim 3 is characterized in that, step S4 specifically comprises:
According to formula L=C * l=(a * A * I
a+ b * A * I
b+ ...+x * A * I
x) * l determines A the hole and the distance of swimming physical length L of bank, and wherein l is the physical length of the unit distance of swimming.
5. the detection method of the rotating speed of recording medium as claimed in claim 4 is characterized in that, step S5 specifically comprises:
According to formula v=L ÷ T=(a * A * I
a+ b * A * I
b+ ...+x * A * I
x) * l ÷ (B * t), determine the rotating speed v of recording medium.
6. the detection method of the rotating speed of recording medium as claimed in claim 3 is characterized in that, and is after step S3, further comprising the steps of:
S6 is according to the formula M=T ÷ C=(÷ (a * A * I of B * t)
a+ b * A * I
b+ ...+x * A * I
x), the time span M of the unit's of obtaining channel bit.
7. the detection method of the rotating speed of recording medium as claimed in claim 6 is characterized in that, after step S6, also comprises: obtain the time span a * M of each hole and bank, and b * M ..., x * M.
8. the pick-up unit of the rotating speed of a recording medium is characterized in that, described device comprises:
Sampling unit is used for the hole and the bank of recording medium of rotation sampled;
The sampling time acquiring unit is used for determining A hole of sampling and the used time T of bank, and described A is predefined constant value;
The run length acquiring unit is used for determining the run length C of A hole and bank according to the hole of all lengths and probability and the hole of all lengths and the run length of bank of bank appearance;
Distance of swimming physical length acquiring unit is used for physical length and the definite run length C of run length acquiring unit according to the unit distance of swimming, determines the distance of swimming physical length L of A hole and bank;
The rotating speed acquiring unit is used for distance of swimming physical length L and the sampling time acquiring unit definite sampling time T definite according to distance of swimming physical length acquiring unit, determines the rotating speed of recording medium.
9. the pick-up unit of the rotating speed of recording medium as claimed in claim 8, it is characterized in that, described device also comprises: the time span acquiring unit of unit channel bit, be used for run length C and the sampling time acquiring unit definite sampling time T definite, the time span M of the unit's of obtaining channel bit according to the run length acquiring unit.
10. the pick-up unit of the rotating speed of recording medium as claimed in claim 9, it is characterized in that, described device also comprises: the tunnel shore time length acquiring unit, the time span M and the hole of all lengths and the run length of bank that are used for the unit channel bit that the time span acquiring unit according to the unit channel bit obtains, obtain the time span a * M of each hole bank, b * M ..., x * M.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101775586A CN101650950B (en) | 2009-05-20 | 2009-09-15 | Method and device for detecting rotation speed of recording medium |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910085007.7 | 2009-05-20 | ||
| CN200910085007 | 2009-05-20 | ||
| CN2009101775586A CN101650950B (en) | 2009-05-20 | 2009-09-15 | Method and device for detecting rotation speed of recording medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101650950A CN101650950A (en) | 2010-02-17 |
| CN101650950B true CN101650950B (en) | 2011-08-17 |
Family
ID=41673170
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009101775586A Active CN101650950B (en) | 2009-05-20 | 2009-09-15 | Method and device for detecting rotation speed of recording medium |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101650950B (en) |
-
2009
- 2009-09-15 CN CN2009101775586A patent/CN101650950B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN101650950A (en) | 2010-02-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2008127892A3 (en) | Error detection and rejection for a diagnostic testing system | |
| US20050283700A1 (en) | Digital error mapping circuit and method | |
| CN1355921A (en) | Accumulating read channel performance data | |
| CN1942966B (en) | Dc-controlled encoding for optical storage systems | |
| CN101650950B (en) | Method and device for detecting rotation speed of recording medium | |
| KR870010459A (en) | Method and apparatus for reading barcodes at fast changing scanning speeds | |
| JP2517107B2 (en) | Optical information recording / reproducing device | |
| TWI635486B (en) | Information recording medium, information regeneration method and information regeneration device | |
| CN100587818C (en) | Optical disc reproduction method and apparatus | |
| CN101609705B (en) | Apparatus and method for writing code data into storage medium | |
| CN100385525C (en) | Apparatus for detecting physical marks from wobble signal and method thereof | |
| JP3812326B2 (en) | BCA signal evaluation method for rewritable DVD | |
| CN100414631C (en) | Decoder | |
| US20030055637A1 (en) | Signal processing circuit for noise elimination and demodulator circuit using the same for accurate demodulation | |
| CN1430214A (en) | Information storage medium, information recording device, information playback device | |
| CN101819787A (en) | Device and method for testing asymmetry of optical disc | |
| JPH07107752B2 (en) | Optical information recording carrier | |
| CN1983416B (en) | Method for discriminating disk data orbital distance | |
| RU2009138050A (en) | METHOD FOR CHECKING THE OPTICAL DISK AND THE MEDIA IN THE VIEW OF THE OPTICAL DISK | |
| CN100401416C (en) | Defect signal detection device and method | |
| CN1988024A (en) | Weighted defect estimation apparatus and related method | |
| WO2006098567A1 (en) | Information recording medium and apparatus for recording information to or reproducing information from the same | |
| CN100452180C (en) | Detection method and device for the signals read from the blue light multilevel optical storage device | |
| CN101510429B (en) | Method for obtaining recording media data frame, channel position and tunnel shore time length | |
| JP4123422B2 (en) | Time measuring device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: WUXI APPLICATION TECHNOLOGY RESEARCH INSTITUTE OF Free format text: FORMER OWNER: TSINGHUA UNIVERSITY Effective date: 20130913 Owner name: TSINGHUA UNIVERSITY Effective date: 20130913 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 100084 HAIDIAN, BEIJING TO: 214072 WUXI, JIANGSU PROVINCE |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20130913 Address after: 214072 Jiangsu Province Road DiCui Binhu District of Wuxi City No. 100, No. 1 building, 530 floor 12 Patentee after: WUXI RESEARCH INSTITUTE OF APPLIED TECHNOLOGIES, TSINGHUA UNIVERSITY Patentee after: Tsinghua University Address before: 100084 Beijing Haidian District Tsinghua Yuan 100084-82 mailbox Patentee before: Tsinghua University |