Method and apparatus for performing speech frame encoding mode s

Details Method and apparatus for performing speech frame encoding mode s Method and apparatus for performing speech frame encoding mode s

1997-03-11

1999-06-08

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704214, 704219, 704229, G10L 914

Patent

active

059111283

ABSTRACT:
A method and apparatus for the selection of an encoding mode for speech frames in a variable rate encoding system. For each speech frame, the method and apparatus selects the encoding mode which provides for rate efficient coding. A mode measurement element receives a speech signal and a signal derived from the same speech signal, and generates a set of parameters which are ideally suited for operational mode selection. Rate determination logic receives the set of parameters and selects an encoding rate using predetermined selection rules. The selection rules further distinguish between unvoiced speech and temporally masked speech, which are encoded at the same rate but with different encoding strategies.

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