Encoding and decoding method of record medium
A technology for recording media and encoding methods, applied in digital recording/reproduction, code conversion, electrical components, etc., can solve problems such as poor encoding efficiency and complicated calculation process
Inactive Publication Date: 2004-08-25
IND TECH RES INST
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As far as EFM is concerned, it is mainly able to provide a modulation mechanism with a coding efficiency of 8 / 17 under the limitation of (d, k) of (2, 10), but because this method can make any two sets of digital words can be The connection can meet the (d, k) restriction, and in order to improve the ability to control the DC component (DC-Free), a 3-bit Merging Code (MergingCode) is added to the original 14-bit digital word. ), not only makes the coding efficiency worse, but also makes the calculation process more complicated; as for the other EFMPlus, it mainly provides a combination of type (Type) and state (State) in (2, 10 ) under the limitation of (d, k), the modulation mechanism is provided with a coding efficiency of 8 / 16, but in this way, many digital words will be reused, that is, different data words may be modulated into the same Digital words, so when demodulating, auxiliary conditions will be added to avoid errors in decoding
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[0042] Concrete and feasible embodiments of the present invention are described as follows in conjunction with the accompanying drawings:
[0043] The present invention is an encoding and decoding method for a recording medium, which uses the concepts of type (Type) and set (Set) to design a digital table (see Fig. 3-a to Fig. 3-h for encoding and Decoding program. The inventive method, on the coding program, except being able to satisfy the most basic (d, k) restriction on the coding mechanism, more utilizes the judgment to auxiliary conditions such as type dependence and digital sum value (Digital SumValue, DSV) , resulting in a coding method with better coding efficiency (Coding Rate) and better DC component control capability (DC-Free), thereby increasing the recordable capacity of the recording medium; as for the decoding process, it is also through the type dependence, Auxiliary conditions such as the collection of forbidden types can complete decoding correctly and quic...
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A code / decode method namely, a variable / demodulation system contains the type / set code concept at the same time. Apart from satisfying the most basic DK-constraint on the code system(d, k constraint), it utilizes judgment to the type dependency and digital sum value,(DSV) to generate a coding way with fine coding rate and better DC-free to increase the recording volume of medial recording. On the decoding program, a correct and quick decoding way is generated by type dependency and inhibit-connection type set to generate a correct and quick decoding way further to reduce probability of error judgment.
Description
technical field [0001] The present invention relates to a method for generating and converting coded data, in particular to a method for generating code and converting code using Run Length Limit (RLL) mode. Background technique [0002] The modulation / demodulation mechanism of recording media (such as: Compact Disk, Digital Versatile Disk) is used to convert the original data words into digital words through calculation and encoding of specific rules of encoding technology, and can use a small storage space The method is recorded in the recording medium, and the original data can be restored and used through certain decoding rules. Therefore, the general recording medium modulation / demodulation mechanism usually includes two parts: one is modulation coding; the other is Demodulation and decoding. Currently, the most widely used recording media modulation / demodulation technology should be EFM (Eight-to-Fourteen Modulation) applied to CD recording media, and EFMPlus, which i...
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IPC IPC(8): G11B20/10H03M7/46
Inventor 刘碧海杨永吉
Owner IND TECH RES INST