Channel bitword processor, PRML decoder, and optical information recording/reproducing device

摘要

It is an objective of the present invention to provide a technique, when using fixed-length run-length limit codes based on enumeration, that generates fixed-length channel bit words satisfying maximum run-length limitation using a simple configuration. A channel bit word processor according to the present invention includes an avoidance list that describes a difference between a user bit word satisfying a maximum run-length limitation of run-length limit code and a user bit word not satisfying the maximum run-length limitation. The channel bit word processor, if a user bit word does not satisfy the maximum run-length limitation, generates a channel bit word using a user bit word after the difference is added.

主权项

1. A channel bit word processor that processes a channel bit word using a run-length limit code of fixed length based on enumeration, comprising:
a channel bit word generator that generates the channel bit word using a user bit word; an avoidance list that describes a difference between an identifier of the user bit word that satisfies a maximum run-length limitation in run-length limit code and an identifier of the user bit word that does not satisfy the maximum run-length limitation; and an adder that adds the difference described in the avoidance list to the user bit word, wherein if the user bit word does not satisfy the maximum run-length limitation, the channel bit word generator generates the channel bit word using the user bit word corresponding to an identifier after the adder adds the difference.