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Run length rate (RLR) modulation data recording method

A ratio, run-length technique used in digital storage

Inactive Publication Date: 2012-07-04
北京同方光盘股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the limitation of the clock recovery of the readout system, the resolution of the run length cannot be infinitely improved; and due to the limitation of the readout system, the excessively subdivided run length will face the pressure of a rapidly decreasing signal-to-noise ratio

Method used

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  • Run length rate (RLR) modulation data recording method

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Embodiment Construction

[0019] A specific embodiment using the content of the present invention is introduced here to help understand the content and spirit of the present invention. It should be noted that the following specific embodiment is a specific case of using the content of the present invention, and this embodiment does not cover all the content of the present invention. The present invention is not limited to the content in this embodiment. All specific embodiments using the content and spirit of the present invention are included in the patent protection scope of the present invention.

[0020] Below is the concrete content of this embodiment:

[0021] Suppose the data sequence to be recorded is B1, B2, B3.... B1 represents a byte, containing 8bit information;

[0022] Generate b1, b2, b3, . . . by using the run-length modulation of the B sequence. b represents the unit recorder. Run length modulation has the following characteristics: a) This modulation process only controls the max...

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Abstract

The invention relates to a method for realizing modulation coding of a digital storage product. In the digital storage product, modulation coding is required to be performed on user information to meet channel transmission limit and digital clock restoring performance, and a digital clock can be well restored by generally adopting a run length limit coding form. The method designs a method for realizing modulation coding on the basis of meeting a clock restoring requirement, i.e., a run length rate (RLR) modulation coding method. The method comprises the following steps of: (1) performing RLR modulating coding on binary information which is subjected to error correction coding; and (2) controlling the recording mark length of a physical recording medium and the formation of a microstructure by using data information which is subjected to RLR rate modulation coding.

Description

technical field [0001] The present invention relates to digital storage technology, more specifically, to the digital storage technology using optical disk or hard disk. Background technique [0002] The modulation codes used in traditional digital storage products (such as optical discs and magnetic disks) are binary run length limited (RLL(d, k)) modulation codes. Among them, d and k mean that the number of 0s between two adjacent 1s is at least d, and at most no more than k. For example, CDs use RLL (2, 11) EFM codes with a code rate of 8 / 17, and DVDs use 8 / 16 RLL (2, 11) EFM codes. In the above digital storage products, user data is represented by changes in the microscopic form of the record. In traditional digital storage products, user data is expressed as a modulated binary data sequence by changing the length of the record. In the run-length limited modulation coding method, the length of the record is changed by subdivision, or other microstructures can be chang...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B20/10H03M7/46
Inventor 徐海峥许斌刘伟陈垦
Owner 北京同方光盘股份有限公司
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