Adding noise during LPC coded voice activity periods to improve

Details Adding noise during LPC coded voice activity periods to improve Adding noise during LPC coded voice activity periods to improve

1998-05-11

2000-09-19

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704219, 704233, G10L 1914

Patent

active

061226114

ABSTRACT:
A system and method to improve the quality of coded speech coexisting with background noise. For instance, the present invention receives a coded speech signal via a communication network and then decodes and synthesizes the different parameters contained within it to produce a synthesized speech signal. The present invention determines the non-speech periods that are represented within the synthesized speech signal. The determined non-speech periods are then utilized to determine and code LPC parameters needed for background noise synthesis. Because medium or low bit rate LPC-coded speech during voice activity periods has the coexisting background noise attenuated, the decoded signal has audible abrupt changes in the level of the background noise. To improve decoded speech quality, the present invention adds simulated background noise to decoded noisy speech when synthesizing the noisy speech signal during voice activity periods. The resulting output signal sounds more natural and realistic to the human ear because of the continuous presence of background noise during speech and non-speech periods.

REFERENCES:
patent: 5142582 (1992-08-01), Asakawa et al.
patent: 5327457 (1994-07-01), Leopold
patent: 5812965 (1998-09-01), Massaloux
patent: 5864799 (1999-01-01), Corretjer et al.
patent: 6055497 (2000-04-01), Hallkvist et al.
Cyrille Morel, "Comfort noise generation device for speech encoding-decoding", Derwent abstract 1998-508727 of published foreign patent publications, Dec. 1998.

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