Nonlinear filter for noise suppression in linear prediction speech processing devices
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United States of America Patent
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Jun 15, 1999
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N/A
app pub date -
Aug 29, 1997
filing date -
Aug 29, 1997
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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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