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Multi-exponent run-length data conversion method and apparatus and red light multi-exponent optical memory

A conversion method and optical storage technology, applied in data recording, code conversion, information storage, etc., can solve the problems of complex coder/decoder, large code table size, weak DC control ability, etc.

Inactive Publication Date: 2007-06-06
SHANGHAI XIANGZHANG ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to its code table size (2 12 =4096) is large, and at the same time there are fewer DC control bits, so the encoder / decoder is more complicated, and the DC control capability is weak

Method used

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  • Multi-exponent run-length data conversion method and apparatus and red light multi-exponent optical memory
  • Multi-exponent run-length data conversion method and apparatus and red light multi-exponent optical memory
  • Multi-exponent run-length data conversion method and apparatus and red light multi-exponent optical memory

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Embodiment Construction

[0037] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0038] The present invention provides a multi-level run length data conversion method for a red multi-level optical storage device, wherein the track pitch of the red multi-level optical storage device is greater than or equal to 0.52 microns, and the method includes a modulation step: using The encoding table of the length-limited encoding and the status information of the encoder transform the input source word into a code word, and burn the code word into a red-light multi-level optical storage device by laser to form a multi-level code element sequence; wherein, the run length is limited by Limited coding is a 3-element (d, k) code with code rate R=5 / 7 bits / symbol, which is used to convert a 5-bit source word composed of decimal user data into a code word composed of 7 multi-order symbols , where d=2, represents the minimum numbe...

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Abstract

A method for converting multi-order run length data includes using ternary ( d, k ) code with code rate of R = 5 / 7 bit / code element as run length limited code in order to convert 5 bit source character formed by decimal system user data to be code character formed by 7 multi-order code elements, applying d = 2 to present minimum number of code element zero between two non-zero code elements and applying k >= 9 as k being used to present maximum number of code element zero between two non-zero code elements. The data converting device used for realizing said method is also disclosed.

Description

technical field [0001] The present invention relates to high-density digital storage technology, more specifically, to a multi-level run length data conversion method and device for red light multi-level optical storage devices, and to a multi-level run length data conversion method and device using the above-mentioned multi-level run length data conversion method and device A red-ray multi-level optical storage device (such as a red-light multi-level read-only optical disc). Background technique [0002] Existing digital magnetic storage and optical storage products convert information into binary data, and the binary data corresponds to two different physical states of the storage medium record in a certain modulation method to realize data storage. This type of storage method is called Stored as a binary value. The current read-only optical disc storage technology adopts a binary storage method. According to the intensity of reflected light, it is judged whether the curr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B20/14G11B7/00H03M7/46
Inventor 刘建民王豪吴大林
Owner SHANGHAI XIANGZHANG ELECTRONICS