US 8,078,460 B2 · Method and apparatus for noise suppression

Abstract

In a noise suppression apparatus for suppressing noise contained in a speech signal, the speech signal is converted to a first vector of spectral speech components and a second vector of spectral speech components identical to the first vector. A vector of noise suppression coefficients is determined based on the first vector spectral speech components. A vector of estimated noise components is determined based on the first vector spectral speech components, and a speech section correction factor and a nonspeech section correction factor are calculated from the estimated noise components and the first-vector spectral speech components to produce a combined correction factor. The noise suppression coefficients are weighted by the combined correction factor to produce a vector of post-suppression coefficients. The second vector spectral speech components are weighted by the post-suppression coefficients to produce a vector of enhanced speech components.

Claims33

Dependent claims

A method of suppressing noise in a speech signal by using a computer to carry out the processes of:

a) converting, by at least one processing device, the speech signal to a first vector of frequency spectral speech components and a second vector of frequency spectral speech components identical to said first vector frequency spectral speech components;
b) determining, by the at least one processing device, a vector of noise suppression coefficients based on said first vector frequency spectral speech components;
c) determining, by the at least one processing device, a speech-versus-noise relationship based on said first vector frequency spectral speech components;
d) determining, by the at least one processing device, a vector of post-suppression coefficients based on said determined speech-versus-noise relationship, said first vector frequency spectral speech components, and said vector of noise suppression coefficients determined in process (b);
and
e) weighting, by the at least one processor, said second vector frequency spectral speech components by said vector of post-suppression coefficients.

3 more elements

An apparatus for suppressing noise in a speech signal, comprising:

a converter that converts the speech signal to a first vector of frequency spectral speech components and a second vector of frequency spectral speech components identical to said first vector of frequency spectral speech components;
a noise suppression coefficient calculator that determines a vector of noise suppression coefficients based on said first vector frequency spectral speech components;
a speech-versus-noise relationship calculator that determines a speech-versus-noise relationship based on said first vector frequency spectral speech components and said vector of noise suppression coefficients;
a post-suppression coefficient calculator that determines a vector of post-suppression coefficients based on said speech-versus-noise relationship, said first vector frequency spectral speech components, and said vector of noise suppression coefficients determined by said noise suppression coefficient calculator;
and
a weighting circuit that weights said second vector of frequency spectral speech components by said vector of post-suppression coefficients.

3 more elements

An apparatus for suppressing noise in a speech signal, comprising:

a converter that converts the speech signal to a first vector of frequency spectral speech components and a second vector of frequency spectral speech components identical to said first vector of frequency spectral speech components;
a noise estimator estimates a vector of frequency spectral noise components from said first vector frequency spectral speech components;
a signal-to-noise ratio calculator that calculates a signal-to-noise ratio by using at least said first vector of frequency spectral speech components and said estimated vector of frequency spectral noise components;
a noise suppression coefficient calculator that determines a vector of noise suppression coefficients from said signal-to-noise ratio;
a suppression coefficient corrector that corrects said vector of noise suppression coefficients by using said signal-to-noise ratio;
and
a weighting circuit that weights said second vector of frequency spectral speech components by said vector of corrected noise suppression coefficients.

4 more elements

Dependencies are inferred from the claim text.

Method and apparatus for noise suppression

Life of this patent

Method and apparatus for noise suppression

Life of this patent

Abstract

Claims33