Code table reduction apparatus for variable length decoder

Details Code table reduction apparatus for variable length decoder Code table reduction apparatus for variable length decoder

1995-09-12

1997-04-08

Williams, Howard L.

Coded data generation or conversion

Digital code to digital code converters

To or from variable length codes

341 59, 341 65, 341106, H03M 740

Patent

active

056192002

ABSTRACT:
A code table apparatus for a variable length decoder (VLD) is disclosed. The code table apparatus is connected to a barrel shifter to obtain an input code which consists of a code word portion and a sign bit. The code table apparatus comprises a coefficient table for generating a level code and a length code by the code word portion, and a mask circuit for generating a sign bit by a logic operation of the input code and the length code. The coefficient table can decode input codes with opposite sign bits, thus reducing the dimensions of the coefficient table as well as the VLD. Furthermore, since the dimensions of the coefficient table are reduced, the operation time delay of the DCT coefficient table can be shorter, thus improving the performance of the VLD.

REFERENCES:
patent: 4150368 (1979-04-01), Chea, Jr.
patent: 4580129 (1986-04-01), Bahgat
patent: 5032838 (1991-07-01), Murayama et al.
patent: 5166684 (1992-11-01), Juri et al.
patent: 5479166 (1995-12-01), Read et al.

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