Apparatus and method for rate determination in a communication s

Details Apparatus and method for rate determination in a communication s Apparatus and method for rate determination in a communication s

1997-02-26

2000-08-15

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704226, 704233, 381 941, G10L 1900, H04B 1500

Patent

active

06104993&

ABSTRACT:
To accurately determine rate and voice activity in moderate-to-low signal-to-noise ratios (SNRs) to maximize voice quality, system capacity and/or battery life, parameters from a noise suppression system are used as inputs to the rate determination function. Using this method, more of the speech is extracted from the background noise and a lower number of false onsets during fluctuating noise conditions compared with conventional systems are detected. The method is beneficial for voice activity detection (VAD) as well as rate determination (RDA) and unlike other RDA/VAD implementations, is independent of the type of speech coder employed (IS-127, CDG-27, IS-96 and GSM).

REFERENCES:
patent: 5341456 (1994-08-01), DeJaco
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patent: 5937377 (1999-08-01), Hardiman et al.
TR45, "Enhanced Variable Rate Codec, Speech Service Option 3 for Wideband Spread Spectrum Digital Systems", IS-127, Sep. 9, 1996.

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