Method for producing multi-exponent read-only mother disc

Abstract

A method for preparing multi-order read-only mother disc includes forming user data in binary system to be multi-order coding sequence through error correction coding and multi-order modulation coding for generating write in signal being used to control mother disc write-in, setting inter-channel gap said mother disc to be less than 0.52 micron, utilizing said write in signal to control write-in laser power outputted by laser for carrying out write-in on mother disc so as to generate multi-order read-only mother disc.

Description

[0001] This application is a divisional application of the invention patent application with the application number 200510053509.3, the application date is March 8, 2005, and the invention title is "multi-level read-only optical disk and its manufacturing method". technical field [0002] The present invention relates to digital storage technology, more specifically, relates to the digital storage technology using CD-ROM. Background technique [0003] Existing digital disc products convert information into binary data, and the binary data corresponds to two different physical states of the record symbol of the storage medium in a certain modulation method to realize data storage. This type of storage method is called binary storage. 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 current corresponding position is "Pit" or "Land". Each recording unit Two state number...

AI Technical Summary

Problems solved by technology

The parameter d controls the highest transmission frequency and thus may affect the intersymbol interference when the sequence is transmitted over a band-limited channel

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