Method for coding high density optical disk modulating code

Abstract

A method is provided for encoding the modulation code of high-density optical disk. The character is as follow. The run length is 1 to 10 and the code rate is 4 / 6. Add DC control bit in the source data to increase the capacity of controlling direct current component. There are 21 meeting the d-k demand in the 6-figure code letter. 16 code letters are choosed as basic code letters to compose the basic code table, and in 5 code letters left the one whose head and end are both 0 is used as connector. Alternative table is made up of basic code letters and connectors, the length of which is 56. The cascade collision problem of code letters is settled by forward looking encoding. If there is cascade collision between code letters through current and forward looking data modulation, the 2 groups of code letters are replaced by the ones in the alternative table; otherwise, modulate the current data. It has higher capacity and encoding efficiency than DVD. The capacity of single side and double layer is up to 13G. It can meet the demand of high definition video programmes. Furthermore, its direct current component is acceptable; the biggest DSV is 2 times of DVD; the code rate is 33.3% higher than DVD; encoding efficiency is one percentage point higher than DVD.

Description

technical field [0001] The invention belongs to the technical field of optical disc storage, and in particular relates to the design of optical disc modulation codes, which can be applied in high-density optical storage devices. technical background [0002] At present, the capacity of traditional DVD discs can no longer meet the high-capacity requirements for watching high-definition video programs. Although Blu-ray discs have been produced abroad (the capacity of which can reach 25G on a single side and a single layer), its expensive cost makes it in the current market. Can not promote in the market, therefore, it is imperative to develop a kind of high-capacity disc based on red light technology. At the same time, the survival of the manufacturers of DVD players in my country is greatly threatened because of the problem of DVD copyright patents. In order to get rid of the burden of expensive patent fees, it is urgent to design a new modulation...

AI Technical Summary

Problems solved by technology

[0016] The capacity is small, the RLL parameter d=2 is taken by the modulation code of DVD, and the maximum capacity of the code is 0.5418, so the code rate can only be about 1 / 2, which is not enough for the standard of 15 GB per side of a new generation of high-density red-ray disc Yes, coding efficiency needs to be improved

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