CN101650950B - Method and device for detecting rotation speed of recording medium - Google Patents
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Abstract
本发明公开了一种记录介质的转速的检测方法，包括步骤：S1，对旋转的记录介质的坑和岸进行采样；S2，确定采样A个坑和岸所用的时间T，所述A为预先设定的常数值；S3，根据各种长度的坑和岸出现的概率和各种长度的坑和岸的游程长度，确定A个坑和岸的游程长度C；S4，根据单位游程的物理长度和所述A个坑和岸的游程长度C，确定A个坑和岸的游程物理长度L；S5，根据所述游程物理长度L和采样A个坑和岸所用的时间T，确定记录介质的转速。本发明还公开了一种记录介质的转速的检测装置。本发明可以实现衡线速通道位、有记录帧结构和无记录帧结构的数据记录介质的转速读取，并且记录介质在任何旋转速度下都能测定其记录介质旋转速度。
The invention discloses a method for detecting the rotational speed of a recording medium, comprising the steps of: S1, sampling the pits and lands of the rotating recording medium; S2, determining the time T for sampling A pits and lands, where A is the The set constant value; S3, according to the occurrence probability of pits and banks of various lengths and the run length of pits and banks of various lengths, determine the run length C of A pits and banks; S4, according to the physical length of the unit run and the run length C of the A pits and the land, determine the physical length L of the run of the A pits and the land; S5, determine the length of the recording medium according to the physical length L of the run and the time T used for sampling the A pits and the land Rotating speed. The invention also discloses a detection device for the rotational speed of the recording medium. The invention can realize the rotational speed reading of the constant linear speed channel bit, the data recording medium with the recording frame structure and the data recording medium without the recording frame structure, and the recording medium rotation speed can be measured at any rotation speed.
Description
技术领域technical field
本发明涉及数字存储技术领域，特别是涉及一种衡线速通道位、有记录帧结构和无记录帧结构的记录介质旋转读取数据时，通道位时间长度、各个长度的坑岸时间长度和记录介质转速的检测方法和装置。The present invention relates to the technical field of digital storage, in particular to a recording medium with linear velocity channel bit, recording frame structure and non-recording frame structure. A method and device for detecting the rotational speed of a recording medium.
背景技术Background technique
现有的数字存储技术都是将信息转换成二进制数据，并将二进制数据以某种调制方式与存储介质记录符的两种不同物理状态相对应，实现数据存储，这类存储方式称为二值存储。目前的只读光盘存储技术所采用的都是二值存储方式，根据反射光光强的高低来判断当前所对应的位置是“坑”(Pit)或者“岸”(Land)，每个记录单元上可以记录两个状态数，也就是正好对应1位(bit)的信息。Existing digital storage technologies convert information into binary data, and correspond the binary data to two different physical states of the storage medium record in a certain modulation method to realize data storage. This type of storage method is called binary storage. The current read-only optical disc storage technology adopts a binary storage method. According to the intensity of reflected light, it is judged whether the current corresponding position is "Pit" or "Land". Each recording unit Two state numbers can be recorded on it, that is, information corresponding to exactly 1 bit.
进行旋转读取数据的记录介质在进行信号恢复之前需要对记录介质的转速进行计算，常规的记录介质转速测定是需要将记录介质的转速控制到一定的范围之内，再通过这个范围来确定帧头采样点个数的范围，然后提取帧头，计算出记录介质旋转速度。The recording medium that rotates to read data needs to calculate the rotational speed of the recording medium before recovering the signal. The conventional measurement of the rotational speed of the recording medium needs to control the rotational speed of the recording medium within a certain range, and then determine the frame through this range. The range of the number of header sampling points, and then extract the frame header, and calculate the rotation speed of the recording medium.
但是，现有技术的测定方法仅仅局限于带帧头的数据记录介质的旋转速度检测，而且有记录介质的旋转速度范围具有一定的局限性。However, the measurement method in the prior art is only limited to the detection of the rotational speed of the data recording medium with a frame header, and the rotational speed range of the recording medium has certain limitations.
发明内容Contents of the invention
本发明要解决的问题是提供一种记录介质的转速的检测方法和装置，以实现衡线速通道位、有记录帧结构和无记录帧结构的数据记录介质的转速读取，并且记录介质在任何旋转速度下都能测定其记录介质旋转速度。The problem to be solved by the present invention is to provide a detection method and device for the rotational speed of a recording medium, so as to realize the reading of the rotational speed of a data recording medium with a constant linear velocity channel bit, a recording frame structure and a non-recording frame structure, and the recording medium is The recording medium rotation speed can be measured at any rotation speed.
为达到上述目的，本发明的技术方案提供一种记录介质的转速的检测方法，所述方法包括以下步骤·S1，对旋转的记录介质的坑和岸进行采样；S2，确定采样A个坑和岸所用的时间T，所述A为预先设定的常数值；S3，根据各种长度的坑和岸出现的概率和各种长度的坑和岸的游程长度，确定A个坑和岸的游程长度C；S4，根据单位游程的物理长度和所述A个坑和岸的游程长度C，确定A个坑和岸的游程物理长度L；S5，根据所述游程物理长度L和采样A个坑和岸所用的时间T，确定记录介质的转速。In order to achieve the above object, the technical solution of the present invention provides a method for detecting the rotating speed of the recording medium, said method comprising the following steps: S1, sampling the pits and banks of the rotating recording medium; S2, determining the sampling A pits and The time T used by the bank, the A is a preset constant value; S3, according to the probability of occurrence of pits and banks of various lengths and the run length of pits and banks of various lengths, determine the run of A pits and banks Length C; S4, according to the physical length of the unit run and the run length C of the A pits and banks, determine the physical length L of the run of the A pits and banks; S5, according to the physical length L of the run and sampling A pits and the time T taken to land, determine the rotational speed of the recording medium.
其中，步骤S2具体包括：确定采样A个坑和岸所用的采样时钟数为B，采样时钟周期为t，则采样A个坑和岸所用的时间T＝B×t。Wherein, step S2 specifically includes: determining that the number of sampling clocks used for sampling A pits and lands is B, and the period of the sampling clock is t, then the time used for sampling A pits and lands is T=B×t.
其中，步骤S2具体包括·S31，根据调制编码方式，获取各种长度的坑和岸出现的概率Ia，Ib，...，Ix；S32，根据调制编码方式，获取各种长度的坑和岸的游程长度a，b，...，x；S33，根据公式C＝a×A×Ia+b×A×Ib+...+x×A×Ix，确定A个坑和岸的游程长度C。Among them, step S2 specifically includes: S31, according to the modulation and coding method, obtain the probability I a , I b , ..., I x of various lengths of pits and lands; S32, according to the modulation and coding method, obtain the probability The run lengths a, b, ..., x of the pit and the bank; S33, according to the formula C=a×A×I a +b×A×I b +...+x×A×I x , determine A The run length C of the pit and bank.
其中，步骤S4具体包括：根据公式L＝C×l＝(a×A×Ia+b×A×Ib+...+x×A×Ix)×l，确定A个坑和岸的游程物理长度L，其中l为单位游程的物理长度。Wherein, step S4 specifically includes: according to the formula L=C×l=(a×A×I a +b×A×I b +...+x×A×I x )×l, determine A pits and lands The physical length of the run is L, where l is the physical length of the unit run.
其中，步骤S5具体包括：根据公式v＝L÷T＝(a×A×Ia+b×A×Ib+...+x×A×Ix)×l÷(B×t)，确定记录介质的转速v。Wherein, step S5 specifically includes: according to the formula v=L÷T=(a×A×I a +b×A×I b +...+x×A×I x )×l÷(B×t), Determine the rotational speed v of the recording medium.
其中，在步骤S3之后，还包括以下步骤·S6，根据公式M＝T÷C＝(B×t)÷(a×A×Ia+b×A×Ib+...+x×A×Ix)，获取单位通道位的时间长度M。Wherein, after the step S3, the following step S6 is also included, according to the formula M=T÷C=(B×t)÷(a×A×I a +b×A×I b +...+x×A ×I x ), to obtain the time length M of the unit channel bit.
其中，在步骤S6之后，还包括：获取各个坑和岸的时间长度a×M，b×M，...，x×M。Wherein, after step S6, further includes: obtaining the time length a×M, b×M, . . . , x×M of each pit and land.
本发明的技术方案还提供一种记录介质的转速的检测装置，所述装置包括：采样单元，用于对旋转的记录介质的坑和岸进行采样；采样时间获取单元，用于确定采样A个坑和岸所用的时间T，所述A 为预先设定的常数值；游程长度获取单元，用于根据各种长度的坑和岸出现的概率和各种长度的坑和岸的游程长度，确定A个坑和岸的游程长度C；游程物理长度获取单元，用于根据单位游程的物理长度和游程长度获取单元确定的游程长度C，确定A个坑和岸的游程物理长度L；转速获取单元，用于根据游程物理长度获取单元确定的游程物理长度L和采样时间获取单元确定的采样时间T，确定记录介质的转速。The technical solution of the present invention also provides a detection device for the rotational speed of the recording medium, which includes: a sampling unit for sampling the pits and lands of the rotating recording medium; a sampling time acquisition unit for determining the sampling time The time T used by the pit and the bank, the A is a preset constant value; the run length acquisition unit is used to determine the probability of occurrence of the pit and the bank according to various lengths and the run length of the pit and the bank of various lengths. The run length C of A pits and banks; the physical length of run acquisition unit, used to determine the physical length L of the run of A pits and banks according to the physical length of the unit run and the run length C determined by the run length acquisition unit; the rotational speed acquisition unit , for determining the rotational speed of the recording medium according to the run physical length L determined by the run physical length acquisition unit and the sampling time T determined by the sampling time acquisition unit.
其中，所述装置还包括：单位通道位的时间长度获取单元，用于根据游程长度获取单元确定的游程长度C和采样时间获取单元确定的采样时间T，获取单位通道位的时间长度M。Wherein, the device further includes: a time length acquisition unit of a unit channel bit, configured to acquire the time length M of a unit channel bit according to the run length C determined by the run length acquisition unit and the sampling time T determined by the sampling time acquisition unit.
其中，所述装置还包括：坑岸时间长度获取单元，用于根据单位通道位的时间长度获取单元获取的单位通道位的时间长度M和各种长度的坑和岸的游程长度，获取各个坑岸的时间长度a×M，b×M，...，x×M。Wherein, the device further includes: a pit bank time length acquisition unit, used to obtain the time length M of the unit channel bit and the run lengths of pits and lands of various lengths according to the time length acquisition unit of the unit channel bit, and acquire the length of each pit The time length of the bank is a×M, b×M, . . . , x×M.
与现有技术相比，本发明的技术方案具有如下优点：Compared with the prior art, the technical solution of the present invention has the following advantages:
本发明不但可以实现衡线速通道位、有记录帧结构的记录介质的数据记录介质的转速读取，而且可以实现衡线速通道位、无记录帧结构的记录介质的转速读取；另外，在本发明中，记录介质在任何旋转速度下都能测定其记录介质旋转速度。The present invention can not only realize the rotational speed reading of the linear velocity channel bit and the data recording medium of the recording medium with the recording frame structure, but also can realize the linear velocity channel bit and the rotational velocity reading of the recording medium without the recording frame structure; in addition, In the present invention, the recording medium rotation speed can be measured at any rotation speed of the recording medium.
附图说明Description of drawings
图1为本发明实施例的一种记录介质的转速的检测方法的流程图；1 is a flowchart of a method for detecting the rotational speed of a recording medium according to an embodiment of the present invention;
图2为本发明实施例中衡线速通道位500个坑和岸的采样点数统计效果的示意图。Fig. 2 is a schematic diagram of the statistical effect of the sampling points of 500 pits and lands in the balanced linear velocity channel according to the embodiment of the present invention.
具体实施方式Detailed ways
下面结合附图和实施例，对本发明的具体实施方式作进一步详细描述。以下实施例用于说明本发明，但不用来限制本发明的范围。The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.
本发明以DVD5为例，对衡线速通道位的记录介质在未知速度下进行旋转读取的情况进行说明，本发明实施例的一种记录介质的转速的检测方法如图1所示，包括以下步骤：The present invention takes DVD5 as an example to illustrate the situation that the recording medium of the constant linear velocity channel position is rotated and read at an unknown speed. A detection method for the rotational speed of a recording medium in an embodiment of the present invention is shown in Figure 1, including The following steps:
步骤s101，对旋转的记录介质的坑和岸进行采样。Step s101, sampling pits and lands of a rotating recording medium.
步骤s102，确定采样A个坑和岸所用的时间T，所述A为预先设定的常数值。由于调制编码前经过了扰频的数据具有随机性的特点，所以各个长度坑和岸出现的概率是固定的，因此给定一个适当的常数A，记录介质上连续常数A个坑岸中，各个长度坑和岸出现的概率是接近调制编码理论中各个长度坑和岸出现的概率的。对于常数A的设定：各种长度的坑和岸出现的概率Ia，Ib，...，Ix是通过调制编码得到的，如果常数A的取值越大，则A个坑和岸中各个长度的坑或者岸数除以A的值越接近各个长度的坑和岸对应的概率Ia，Ib，...，Ix；反之，当A为1时，A个坑和岸中各个长度的坑或者岸数除以A的值与各个长度的坑和岸对应的概率Ia，Ib，...，Ix差别最大(只有一个值为1，其它全为0)。所以，A的值在满足系统能够承受范围之内时，应当尽量的大。本实施例中采用的预先设定的常数值A为500，衡线速通道位500个坑和岸的采样点数统计效果的示意图如图2所示，从图2可以看出，采样500个坑和岸所用的采样时钟数接近8900，其中时钟周期为t，得到采样500个坑和岸所用的时间T＝8900×t。Step s102, determining the time T used for sampling A pits and lands, where A is a preset constant value. Since the data that has been scrambled before modulation and encoding has the characteristics of randomness, the probability of occurrence of pits and lands of each length is fixed. Therefore, given an appropriate constant A, among the continuous constant A pits and lands on the recording medium, each The probability of occurrence of length pits and lands is close to that of each length pits and lands in modulation coding theory. For the setting of the constant A: the probability I a , I b , ..., I x of pits and lands of various lengths is obtained through modulation and coding. If the value of the constant A is larger, the A pits and lands The value of dividing the number of pits or banks of each length in the bank by A is closer to the probability I a , I b , ..., I x corresponding to the pits and banks of each length; on the contrary, when A is 1, A pits and The number of pits or banks of each length in the bank divided by the value of A and the probability I a , I b , ..., I x corresponding to the pits and banks of each length have the largest difference (only one value is 1, and the others are all 0) . Therefore, the value of A should be as large as possible within the acceptable range of the system. The preset constant value A used in this embodiment is 500, and the schematic diagram of the statistical effect of the sampling points of 500 pits and banks at the constant line speed channel is shown in Figure 2. As can be seen from Figure 2, 500 pits are sampled The number of sampling clocks used by the land and land is close to 8900, where the clock period is t, and the time T=8900×t for sampling 500 pits and lands is obtained.
步骤s103，根据各种长度的坑和岸出现的概率和各种长度的坑和岸的游程长度，确定A个坑和岸的游程长度C。各种长度的坑和岸出现的概率是由调制编码方式确定的，由于调制编码前的数据具有随机性特点，调制编码出来的的各种长度的游程(即各种长的的坑和岸)的概率是固定的，所以各种长度的坑和岸出现的概率由调制编码的方式决定；各种长度的坑和岸的游程长度也是由调制编码方式确定的，例如根据DVD5的调制编码我们知道其游程长度有：3T，4T，5T，6T，7T，8T，9T，10T，11T，14T(T为单个通道位，即单位个游程长度，DVD5的3T的物理长度为400纳米，即单个通道位长度为400 ÷3＝133.33纳米)。本实施例中，假设各种长度的坑和岸出现的概率为Ia，Ib，...，Ix，各种长度的坑和岸的游程长度为a，b，...，x，则500个坑和岸的游程长度C＝a×A×Ia+b×A×Ib+...+x×A×Ix。Step s103, according to the occurrence probability of pits and lands of various lengths and the run lengths of pits and lands of various lengths, determine the run length C of A pits and lands. The probability of occurrence of pits and lands of various lengths is determined by the modulation and encoding method. Since the data before modulation and encoding is random, the run lengths of various lengths (that is, various long pits and lands) obtained by modulation and encoding The probability of is fixed, so the probability of pits and lands of various lengths is determined by the modulation and coding method; the run length of pits and lands of various lengths is also determined by the modulation and coding method. For example, according to the modulation and coding of DVD5, we know Its run lengths are: 3T, 4T, 5T, 6T, 7T, 8T, 9T, 10T, 11T, 14T (T is a single channel bit, that is, the unit run length, and the physical length of 3T of DVD5 is 400 nanometers, that is, a single channel The bit length is 400 ÷ 3 = 133.33 nanometers). In this embodiment, it is assumed that the probability of occurrence of pits and lands of various lengths is I a , I b , ..., I x , and the run lengths of pits and lands of various lengths are a, b, ..., x , then the run length of 500 pits and lands C=a×A×I a +b×A×I b +...+x×A×I x .
步骤s104，获取单位通道位的时间长度。本实施例中，根据公式M＝C÷T＝(a×500×Ia+b×500×Ib+...+x×500×Ix)÷(8900×t)，获取单位通道位的时间长度M，其中C为500个坑和岸的游程长度，T为采样500个坑和岸所用的时间。Step s104, acquiring the time length of a unit channel bit. In this embodiment, according to the formula M=C÷T=(a×500×I a +b×500×I b +...+x×500×I x )÷(8900×t), the unit channel bit is obtained The length of time M, where C is the run length of 500 pits and banks, and T is the time used to sample 500 pits and banks.
步骤s105，根据单位通道位的时间长度获取单元获取的单位通道位的时间长度M和各种长度的坑和岸的游程长度a，b，...，x，获取各个坑和岸的时间长度a×M，b×M，...，x×M。Step s105, according to the time length of the unit channel bit acquisition unit, the time length M of the unit channel bit and the run lengths a, b, ..., x of pits and lands of various lengths are obtained to obtain the time lengths of each pit and land a×M, b×M, . . . , x×M.
步骤s106，根据单位游程的物理长度和A个坑和岸的游程长度C，确定A个坑和岸的游程物理长度L。本实施例中，根据公式L＝C×l＝(a×500×Ia+b×500×Ib+...+x×500×Ix)×l，确定500个坑和岸的游程物理长度L，其中l为单位游程的物理长度，即单位通道位的物理长度，C为500个坑和岸的游程长度。Step s106, according to the physical length of the unit run and the run length C of the A pits and lands, determine the physical run length L of the A pits and lands. In this embodiment, according to the formula L=C×l=(a×500×I a +b×500×I b +...+x×500×I x )×l, determine the runs of 500 pits and banks The physical length L, where l is the physical length of a unit run, that is, the physical length of a unit channel bit, and C is the run length of 500 pits and lands.
步骤s107，根据游程物理长度L和采样A个坑和岸所用的时间T，确定记录介质的转速。本实施例中，假设500个坑和岸的有效数据个数为D，则读取记录介质有效数据的速度S＝D÷T＝D÷(8900×t)，衡线速通道位的记录介质的转速v＝L÷T＝(a×500×Ia+b×500×Ib+...+x×500×Ix)×l÷(8900×t)。Step s107, according to the physical length L of the run and the time T used for sampling A pits and lands, determine the rotational speed of the recording medium. In this embodiment, assuming that the number of valid data of 500 pits and lands is D, then the speed S=D÷T=D÷(8900×t) for reading the valid data of the recording medium is equal to the recording medium of linear velocity channel bit. The rotational speed v=L÷T=(a×500×I a +b×500×I b +...+x×500×I x )×l÷(8900×t).
在本发明实施例中，由于是每500个坑和岸便计算出一组通道位时间长度值、各个长度的坑岸时间长度值和记录介质转速值。为了减少最后值与真实值的误差，本发明可以将连续计算出来的多组通道位时间长度值、各个长度的坑岸时间长度值和记录介质转速值，进行均值滤波去噪处理最终得到更接近真实的值。In the embodiment of the present invention, since every 500 pits and lands, a set of channel bit time length values, land time length values of various lengths, and recording medium rotational speed values are calculated. In order to reduce the error between the final value and the real value, the present invention can perform mean value filtering and denoising processing on the continuously calculated multi-group channel bit time length values, the pit bank time length values of each length, and the rotational speed value of the recording medium to finally obtain a closer real value.
在进行图1所示的记录介质的转速的检测时，本发明实施例的一种记录介质的转速的检测装置包括采样单元、采样时间获取单元、游 程长度获取单元、游程物理长度获取单元、单位通道位的时间长度获取单元、：坑岸时间长度获取单元和转速获取单元。When performing the detection of the rotational speed of the recording medium shown in Figure 1, a detection device for the rotational speed of the recording medium in the embodiment of the present invention comprises a sampling unit, a sampling time acquisition unit, a run length acquisition unit, a run physical length acquisition unit, The time length acquisition unit of the unit channel bit, the pit bank time length acquisition unit and the rotational speed acquisition unit.
采样单元用于对旋转的记录介质的坑和岸进行采样；采样时间获取单元用于确定采样A个坑和岸所用的时间T，所述A为预先设定的常数值；游程长度获取单元用于根据各种长度的坑和岸出现的概率和各种长度的坑和岸的游程长度，确定A个坑和岸的游程长度C；游程物理长度获取单元用于根据单位游程的物理长度和游程长度获取单元确定的游程长度C，确定A个坑和岸的游程物理长度L；单位通道位的时间长度获取单元用于根据游程长度获取单元确定的游程长度C和采样时间获取单元确定的采样时间T，获取单位通道位的时间长度M；坑岸时间长度获取单元用于根据单位通道位的时间长度获取单元获取的单位通道位的时间长度M和各种长度的坑和岸的游程长度，获取各个坑岸的时间长度a×M，b×M，...，x×M；转速获取单元用于根据游程物理长度获取单元确定的游程物理长度L和采样时间获取单元确定的采样时间T，确定记录介质的转速。The sampling unit is used to sample the pits and banks of the rotating recording medium; the sampling time acquisition unit is used to determine the time T used for sampling A pits and lands, and the A is a preset constant value; the run length acquisition unit is used Based on the probability of occurrence of pits and banks of various lengths and the run lengths of pits and banks of various lengths, determine the run length C of A pits and banks; The run length C determined by the length acquisition unit determines the physical length L of the run of A pits and banks; the time length acquisition unit of the unit channel bit is used to determine the run length C determined by the run length acquisition unit and the sampling time determined by the sampling time acquisition unit T, obtain the time length M of the unit channel bit; the pit bank time length acquisition unit is used to obtain the time length M of the unit channel bit obtained by the unit channel bit time length acquisition unit and the run lengths of pits and banks of various lengths, and obtain The time length of each pit bank a×M, b×M, ..., x×M; the rotation speed acquisition unit is used to determine the physical length of the run according to the physical length of the run length L and the sampling time T determined by the sampling time acquisition unit, Determine the rotational speed of the recording medium.
本发明不但可以实现衡线速通道位、有记录帧结构的记录介质的数据记录介质的转速读取，而且可以实现衡线速通道位、无记录帧结构的记录介质的转速读取；另外，在本发明中，记录介质在任何旋转速度下都能测定其记录介质旋转速度。The present invention can not only realize the rotational speed reading of the linear velocity channel bit and the data recording medium of the recording medium with the recording frame structure, but also can realize the linear velocity channel bit and the rotational velocity reading of the recording medium without the recording frame structure; in addition, In the present invention, the recording medium rotation speed can be measured at any rotation speed of the recording medium.
以上所述仅是本发明的优选实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明技术原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视为本发明的保护范围。The above is only a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the present invention, some improvements and modifications can also be made. These improvements and modifications It should also be regarded as the protection scope of the present invention.
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