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Dual modulation coding method

A coding method, modulation and coding technology, applied in the field of digital storage, can solve the problems of low recording density and storage capacity, and achieve the effects of increasing storage capacity, high code rate, and improving recording density

Active Publication Date: 2010-12-08
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The problem to be solved by the present invention is to provide a dual modulation coding method, which overcomes the defects of low recording density and storage capacity of digital discs in the prior art by realizing high code rate modulation coding

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Embodiment Construction

[0016] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0017] A dual modulation coding method in the embodiment of the present invention is as follows: figure 1 As shown in Fig. 1 , the RLL modulation coding is first performed on the binary data after the error correction coding, and then the order modulation is performed on the data after the RLL modulation coding to generate a game sequence and an order sequence, which are respectively used to control the master laser recorder Formation of record length and microstructure was performed. refer to figure 1 , this embodiment includes the following steps:

[0018] In step s101, user data is subjected to error correction coding to form binary data.

[0019] Step s102 , perfor...

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Abstract

The invention discloses a dual modulation coding method which comprises the following steps of: (A) carrying out run length limit (RLL) (d, k) or order-M RLL (d, k) modulation coding on binary data, wherein in the modulation coding, the value of the parameter d is reduced and / or the value of the parameter k is increased; and (B) carrying out order modulation on the data subjected to the modulation coding of the step (A) to generate a run sequence or an order sequence. In the invention, high-code-rate modulation coding can be realized through reducing the valve of the parameter d and / or increasing the value of the parameter k so as to improve the recording density of a digital video disc and increase the memory capacity.

Description

technical field [0001] The invention relates to the technical field of digital storage, in particular to a double modulation coding method. Background technique [0002] Traditional digital optical storage products (such as CD (Compact Disc, optical disc), DVD (Digital Versatile Disc, Digital Versatile Disc), BD (Blue-ray Disc, Blu-ray Disc)) adopt binary RLL ( d, k) (Run Length Limited) modulation and coding, where d and k mean that the number of 0s between two adjacent 1s is at least d and at most k. For example, CD uses RLL (2, 11) EFM (Eight to Fourteen Modulation, 8-14 bit modulation) code with a code rate of 8 / 17, and DVD uses 8 / 16 RLL (2, 11) EFMplus (8-bit-16 bit modulation) code, BD adopts 2 / 3RLL (1, 7) PP (Parity Preserving, parity preservation) code. The multi-stage optical storage technology mostly adopts M-aryRLL (d, k) modulation coding. where M is the number of orders achievable for each length run. d and k respectively refer to the number of 0s between tw...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B20/14G11B20/18H03M7/46
Inventor 倪屹裴京潘龙法徐海峥陆达刘海龙刘相伟
Owner TSINGHUA UNIV