Variable-length coding device and method using table that holds

Details Variable-length coding device and method using table that holds Variable-length coding device and method using table that holds

1998-05-20

2000-10-31

Williams, Howard L.

Coded data generation or conversion

Digital code to digital code converters

To or from bit count codes

341 67, H03M 746

Patent

active

061409448

ABSTRACT:
A variable-length coding device includes: a code presence/absence determination table storing information concerning whether a code is allocated or not correspondingly to a prescribed region in a region represented by a combination of run data and level data; a first region determination circuit and a second region determination circuit determining whether a pair of run data and level data is contained in the prescribed region; and a run.level pair conversion circuit, a first code table, and a second code table that perform coding, referring to the code presence/absence determination table, if the first region determination circuit and the second region determination circuit determine that the pair of run data and level data is contained in the prescribed region, and that perform coding without referring to the code presence/absence determination table if the first region determination circuit and the second region determination circuit determine that the pair of run data and level data is not contained in the prescribed region.

REFERENCES:
patent: 5381144 (1995-01-01), Wilson et al.
patent: 5394143 (1995-02-01), Murray et al.
patent: 5398027 (1995-03-01), Ooi
patent: 5402123 (1995-03-01), Jung
patent: 5539401 (1996-07-01), Kumaki et al.

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