Title: Method for coding high density optical disk modulating code
Application Number: 200610019694 Application Date: 2006.07.25
Publication Number: 1889185 Publication Date: 2007.01.03
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: G11B20/10;G11B20/14;H03M7/46
Applicant(s) Name: Huazhong Science Address:
Inventor(s) Name: Hu Diqing;Xie Changsheng;Liu Dan
Attorney & Agent: zhu biwu
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.
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