Method for enhancing D.C. suppressed modulation and/or demodulation run-length limited code

A technology of runlength limitation and runlength, which is applied in the field of modulation and demodulation of DC components, and can solve the problems of small number of codewords and inability to effectively realize DC suppression control, etc.

Inactive Publication Date: 2005-06-29
SAMSUNG ELECTRONICS CO LTD
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Problems solved by technology

[0011] In the conventional adjustment method using the modulation code group as shown in Figures 1 and 2, when the number of code words to be used to control DC suppression is

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  • Method for enhancing D.C. suppressed modulation and/or demodulation run-length limited code
  • Method for enhancing D.C. suppressed modulation and/or demodulation run-length limited code
  • Method for enhancing D.C. suppressed modulation and/or demodulation run-length limited code

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Embodiment Construction

[0034] A method of generating run length limited (RLL) code sets applied to the present invention is shown in FIGS. 3A and 3B. First, in step S101, input required minimum run length d, maximum run length k, data bit length m, code word bit length n, main conversion code group distinguishing parameter x, code word duplication parameter y, and specific bit bit ( i), bit(j) and bit(k). Here, the required minimum run length d is 1, the maximum run length k is 8, the data bit length m is 8, the code word bit length n is 12, the main conversion code group distinguishing parameter x is 1, and the code word replication parameter y is 3.

[0035] In step S102, generate 2 that satisfies the condition input in step S101 n codewords 0 to 2 n -1 (212 here). It is determined in step S103 whether the generated codeword satisfies the run length condition (d, k). In step S104, among the generated codewords, codewords that do not satisfy the runlength condition (d, k) are discarded because...

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Abstract

A modulation method and a demodulation method of a run length limited (RLL) code with improved direct current (DC) rejection. In the modulation method, reception data is modulated with a DC suppression control code group separated from a data modulation conversion code group. The DC suppression control code group makes full use of the code characteristics in the conversion code group, such as the sign of the parameter CSV representing the DC value in the code word and the characteristics of the parameter INV that predicts the DSV transition direction of the next code word, and is compatible with the data modulation conversion code Compared with the group, the generation condition of redundant codeword or the condition of usable codeword is relaxed. Therefore, the number of code words is increased, and the possibility of DC suppression control is further improved.

Description

technical field [0001] The present invention relates to the conversion of m-bit information words to modulated signals and the restoration of modulated signals, and more particularly to a method to be used efficiently in run-length-limited (RLL) codes to be used in optical recording / reproducing devices requiring high-density recording / reproducing Modulation and demodulation methods that suppress the direct current (DC) component of a codeword stream. Background technique [0002] The quality of the RLL code expressed as (d, k, m, n) is estimated from the recording density and the suppression amount of its DC component as factors representing the code performance. Here, m represents the number of data bits (also referred to as the number of source bits or the number of information word bits), n represents the number of bits of the modulated codeword (also referred to as the number of channel bits), and d represents the The minimum number of 0s that exist continuously between...

Claims

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Application Information

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IPC IPC(8): G11B20/12G11B20/10G11B20/14H03M5/14H03M7/14H03M7/46
CPCG11B20/10G11B20/1426G11B2020/1442G11B2020/1457H03M5/14H03M5/145H03M7/46
Inventor 沈载晟
Owner SAMSUNG ELECTRONICS CO LTD
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