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Speech coding system with time-domain noise attenuation

  • US 7,020,605 B2
  • Filed: 02/13/2001
  • Issued: 03/28/2006
  • Est. Priority Date: 09/15/2000
  • Status: Expired due to Term
First Claim
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1. A speech coding system comprising:

  • a preprocessor configured to receive a digitized signal from an analog-to-digital converter in time-domain, the preprocessor configured to transform the digital signal into frequency-domain, modify spectral magnitudes of the digitized signal in frequency-domain to generate a noise-reduced digitized signal and transform the noise-reduced digitized signal back to time-domain;

    an encoder disposed to receive the noise-reduced digitized signal in time-domain, the encoder to provide a bitstream based upon a speech coding of the noise-reduced digitized signal;

    where the speech coding determines at least one gain scaling a portion of the noise-reduced digitized signal; and

    where the encoder adjusts the at least one gain as a function of noise characteristic for attenuating background noise in at least one frame,wherein the at least one gain is adjusted according to a gain factor, the gain factor facilitating time-domain background noise attenuation.

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