US PATENT SUBCLASS 714 / 792
.~.~.~ Trellis code

Current as of: June, 1999
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714 /   HD   ERROR DETECTION/CORRECTION AND FAULT DETECTION/RECOVERY

746  DF  DIGITAL DATA ERROR CORRECTION {5}
786  DF  .~ Forward error correction by tree code (e.g., convolutional) {9}
791  DF  .~.~ Sequential decoder (e.g., Fano or stack algorithm) {1}
792.~.~.~ Trellis code

DEFINITION

Classification: 714/792

Trellis code:

(under subclass 786) Subject matter where, for a convolutional code of k bits length, an inverse coding operation is performed in which 2k-1 decision bits are used to select an output bit and where after many branches, the most probable path will be selected with a high degree of

certainty, and where the branches form a mesh pattern (i.e., branches start at a plurality of points and intersect other branches).

SEE OR SEARCH CLASS

375, Pulse or Digital Communications,

265, for trellis coders and decoders in pulse or digital communication.

704, Data Processing: Speech Signal Processing, Linguistics, Language Translation, and Audio Compression/Decompression,

242, for Viterbi trellis speech recognition.