Programmable variable-length decoder

Details Programmable variable-length decoder Programmable variable-length decoder

2006-08-22

2006-08-22

Nguyen, Linh Van (Department: 2819)

Coded data generation or conversion

Digital code to digital code converters

To or from variable length codes

C341S065000

Reexamination Certificate

active

07095341

ABSTRACT:
System and method for decoding variable-length codes. A variable-length decoder includes an address generator and a local memory unit. The local memory stores a variable-length code look-up table. The local memory can be programmed to include a look-up table supporting substantially any decoding algorithm. In one embodiment, a decoder memory unit and a system memory unit are employed together with the local memory to store a codeword look-up table. The shortest codes are stored in local memory, the next shortest in decoder memory, and the longest codes are stored in system memory. A multistage search algorithm is employed to search for the longest codes. The address generator generates the address of the code table to be searched by adding the value of the bits to be searched to a base address.

REFERENCES:
patent: 5625355 (1997-04-01), Takeno et al.
patent: 5696507 (1997-12-01), Nam
patent: 6069575 (2000-05-01), Kinouchi et al.
patent: 6313767 (2001-11-01), Ishizuka et al.
patent: 6587057 (2003-07-01), Scheuermann
patent: 6771196 (2004-08-01), Hsiun
patent: 2002/0154042 (2002-10-01), Igarashi et al.

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