Method and apparatus for encoding digital data

摘要

Encoding tables are accorded with variable-length encoding rules using a variable constraint length. A DSV control bit is periodically inserted into a first input bit stream to generate a second input bit stream. Every m-bit piece of the second input bit stream is encoded into an n-bit output signal forming at least a portion of an output code word by referring to the encoding tables. Thereby, the second input bit stream is converted into a first output bit stream composed of output code words and observing RLL (d, k). A sync word is inserted into the first output bit stream for every frame to generate a second output bit stream. A frame-end output code word is terminated at a position before a next-frame sync word. DSV control of the second output bit stream is implemented in response to the inserted DSV control bits.