Method and device for decoding data regulated by optical driver system 8-14
A decoding method and data technology, which are applied in the recording/reproducing, data recording, encoding and other directions by optical methods, can solve the problems of increasing the burden of the correction program, unable to read, and read the wrong bit data, so as to avoid problems. The effect of improving reliability is that the data cannot be read or the data cannot be read
Inactive Publication Date: 2007-12-05
TIAN HLDG LLC
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[0005] As the reading speed of optical discs is getting higher and higher, it is easy to read optical discs at a reading rate of 40 times or more. The speed of reading data is very fast, and optical discs are easy to scratch, etc. The characteristics of the disc make it easy to read some bits that cannot be read or read the wrong value during the process of reading the data of the disc (such as interpreting the disc mark that was originally 1 as 0), and then appearing that does not meet the above The 14-bit data of the EFM modulation rule, and the erroneous 14-bit data that conforms to the EFM modulation rule (for example, the original correct 0010001000100 is misjudged as 00100001000100 due to the wrong interpretation of the 1 / 0 mark)
In this case, when the optical drive reads data, it is easy to read wrong bit data, which affects the subsequent processing procedures; for example, increasing the burden of subsequent correction procedures
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[0032] FIG. 1 shows a flowchart of a method for decoding EFM data applied to an optical drive system according to a preferred embodiment of the present invention. Referring to FIG. 1 , a method for decoding EFM data provided by the present invention is explained in detail. Here, the optical drive system may be an optical drive system capable of reading a compact disc read only memory (CD-ROM) or a digital versatile disc (DVD). First execute step S101, which is to receive serial data, for example: radio frequency data (Radio Frequency Data referred to as RF DATA) obtained by sensing the laser reflected from the optical disc, and read the RF DATA, and then generate its data through the data shaping circuit String row data. Then step S103 is executed, which is to extract 14-bit data waiting for EFM decoding from the serial data. Then execute step 105, look up the table from the modified EFM decoding table to convert the 14-bit data into decoded 8-bit data, because this modified...
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The invention is a EFM data decoding method and device for driver system. When the fourteen bits data accordant to the disk data coding rule find the eight bits data which can be converted in the EFM coding table, it can jump to the expanded coding table, in order to convert the fourteen bits data into eight bits data. The expanded decoding table has error data accordant to the EFM modulation rules and the probable correspondent eight bits data. The data processed by the invention can upgrade the reliability of the data access.
Description
technical field [0001] The present invention relates to a decoding method and device for reading out optical disc data, and in particular to a method for decoding eight to fourteen modulation (Eight to Fourteen Modulation, EFM) data when reading out optical disc. Background technique [0002] In order to adapt to the characteristics of optical discs and increase the reliability of optical disc data reading, when data is stored in optical discs, EFM and Reed-Soloman code modulation processing will be performed, and the order of data storage will be disrupted by interleaving (Interleave) . Therefore, when reading data from a CD disc, the data must first be decoded by EFM data. [0003] When a CD is storing data, it changes the current burning state of the CD when the data is 1, and does not change the current burning state of the CD when the data is 0. The so-called EFM processing is to convert 8-bit data into 14-bit data, and then store the processed data in the optical dis...
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IPC IPC(8): G11B20/10G11B7/00H03M13/00H03M7/00
Inventor 胡培杰欧阳世龙
Owner TIAN HLDG LLC