Nonlinear filter for noise suppression in linear prediction spee

Details Nonlinear filter for noise suppression in linear prediction spee Nonlinear filter for noise suppression in linear prediction spee

1999-04-13

2000-04-18

Dorvil, Richemond

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704223, G10L 1904

Patent

active

060526599

ABSTRACT:
The invention relates to a linear prediction audio signal processing apparatus, such as a vocoder, including a nonlinear filter to attenuate the residual signal used to excite a linear prediction synthesis filter. The nonlinear filter is capable of reducing the noise component in the signal while keeping only the periodic component of the speech signal. This feature enhances speech quality. The invention also extends to a novel method for processing a residual signal used to excite a linear prediction synthesis filter in order to attenuate wide band additive noise in the speech signal as constructed by the synthesis filter.

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Mermelstein P. et al: "Nonlinear filtering of the LPC residual for noise suppression and speech quality enhancement", IEEE Workshop on Speech Coding for Telecommunications. Back to basics: attacking fundamental problems in speech coding. Sep. 7-10, 1997, pp. 49-50, XP00211240, IEEE, New York, NY, USA. ISBN: 0-7803-4073-6.
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Tomohiko Taniguchi, et al., "Pitch Sharpening for Perceptually Improved CELP and the Sparse-Delta Codebook for Reduced Computation", IEEE pp. 241-244, 1991.

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