Decoding apparatus and method

Details Decoding apparatus and method Decoding apparatus and method

1995-11-28

1998-09-01

Young, Brian K.

Coded data generation or conversion

Digital code to digital code converters

To or from variable length codes

H03M 740

Patent

active

058016503

ABSTRACT:
An unpacking circuit 103 takes the top 16-bit data from an input code after eliminating previously decoded data on the basis of code length information 106. An operation unit 501 obtains a redundant code number of a Huffman code inputted from the unpacking circuit 103 and upper three bits of the code length information 106. By referring to a decoding table 503, an eight-bit fixed-length data and the least significant bit of the code length information are obtained correspondence with an input nine-bit redundant code number signal 502. Therefore, memory size required for storing the decoding table 503 is 2.sup.9 .times.9 bits=576 bytes, thus, comparing to a case where memory size for storing the decoding table of 96 kbytes when changing into a fixed code length by using only the decoding table, it is possible to use a decoding table of smaller size.

REFERENCES:
patent: 4044347 (1977-08-01), Van Voorhis
patent: 4516246 (1985-05-01), Kenemuth
patent: 4700175 (1987-10-01), Bledsoe
patent: 4899149 (1990-02-01), Kahan

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