Coded data generation or conversion – Digital code to digital code converters – Adaptive coding
Patent
1996-07-03
1998-08-11
Gaffin, Jeffrey A.
Coded data generation or conversion
Digital code to digital code converters
Adaptive coding
348403, H04N 726, H04N 730
Patent
active
057933146
ABSTRACT:
The present invention provides an apparatus and method for adaptive entropy encoding/decoding in a multimedia compression system. For encoding, the steps include: A) parsing a predetermined number of quantized transform coefficients into a plurality of coefficient groups in a predetermined scanning order and converting the coefficient groups into a plurality of parameter sets according to a predetermined scheme and storing the parameter sets wherein, where a last coefficient group comprises all zero quantized transform coefficients, the last coefficient group is discarded; B) sending, in accordance with a signal from the encoder controller, a current parameter set of the plurality of parameter sets in the predetermined scanning order; C) adaptively selecting a current entropy encoder based on a state parameter of a last parameter set; D) encoding a current parameter set to provide entropy-encoded information bits. Decoding is accomplished in a fashion that mirrors the encoding method.
REFERENCES:
patent: 5473376 (1995-12-01), Auyeung
Gaffin Jeffrey A.
Jean-Pierre Peguy
Motorola Inc.
Stockley Darleen J.
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