High speed variable length code detection using a cascaded struc

Details High speed variable length code detection using a cascaded struc High speed variable length code detection using a cascaded struc

1997-03-13

1999-07-27

Williams, Howard L.

Coded data generation or conversion

Digital code to digital code converters

To or from variable length codes

H03M 740

Patent

active

059297930

ABSTRACT:
A high speed code word detecting apparatus and method using a cascade structure detects and separates a variable length code from packed data at high speed in accordance with a code word characteristic. The apparatus includes a code length determining unit for determining a plurality of code length values in accordance with a code starting point determination mask for a number corresponding to a maximum code length value when a packet stream is applied, and a code word selecting unit for generating respective code word starting points based upon remaining bits of a code word separated during a just previous clock cycle, and separating a plurality of code words from the plurality of determined code length values during one clock cycle using a cascade structure. The method includes a first step for sequentially determining a plurality of code length values in accordance with a code starting point determination mask for a number corresponding to a maximum code length value when a packet stream is applied, and a second step for generating respective code word starting points based upon remaining bits of a code word separated during a just previous clock cycle, and separating a plurality of code words from the plurality of determined code length values during one clock cycle.

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patent: 5617089 (1997-04-01), Kinouchi et al.
patent: 5784012 (1993-07-01), Kawauchi et al.

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