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

Abstract

A method for converting multi-order run length data includes using quaternary ( d , k ) code with code rate of R = 5 / 8 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 8 multi-order code elements, using 0 , 1 , 2 and 3 as code element and applying d+1=3 to present minimum number of continuous identical code element to be 3 as well as applying k+1=10 to present maximum number of continuous identical code element to be 10. 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] Conventional optical discs all use a run-length (referred to as run length) limited encoding scheme, that is, RLL (Run Length Limited, run length limited) encoding. RLL means that the channel sequence stored on the optical disc satisfies the following conditions: there are at least d '0's and at most k '0's between two '1's in the sequence. The two parameters d and k specify the minimum and maximum run lengths that may appear in the sequence, respectively. The parameter d...

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Problems solved by technology

Such a surface structure connected between different pits makes the duplication and production of this type of read-only optical disc very difficult, mainly because the physical shape of the joint can not be accurately controlled, so that the bit error rate increases when the optical disc is read.

In addition, the multi-order RLL code scheme in the above patent documents does not solve the problem of controlling the DC component of the modulated channel sequence. Therefore, in the actual optical disc reading process, it is easy for the optical disc to fail to servo correctly, resulting in a high error rate or even failure to read the disc. disk reading

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