Method for coding high density optical disk modulating code

Abstract

A kind of encoding method for the modulation code of high-density optical disk, it is characterized in that: adopt run length RLL (1,10), code rate gets 4 / 6; Add a P control bit every 288 bytes in source data, After modulation, select P with a smaller DSV to realize the control of DSV and improve the ability to control the DC component; there are 21 codewords that meet the requirements of R11(1, 10) in the 6-bit codewords, from which the first and last are selected. 16 kinds of 0 are used as the basic coding code words to form the basic coding table, and the code words whose beginning and end are 0 in the remaining 5 code words are used as connectors, and the replacement table is exactly the combination of basic code words and connectors, and the length of the replacement table is 56; Use look-ahead coding to solve the problem of cascading conflicts of codewords. For each modulation, look forward to 4 bits of source data. The code words in the replacement table replace the two groups of conflicting code words; otherwise, the current data is modulated. It has higher capacity and encoding efficiency than DVD, and the single-sided and double-layer capacity can reach 13G, meeting the requirements of high-definition video programs. At the same time, its DC component is within an acceptable range, the maximum DSV is twice that of DVD, the code rate is 33.3% higher than DVD, and the coding efficiency is 1 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 code for multimedia discs w...

AI Technical Summary

Problems solved by technology

[0017] 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

Images