Patent ID: 6339758
Filing Date: 2002-01-15
Classification: G10L

Abstract:
A noise suppression apparatus for independently outputting speech frequency components and noise frequency components, comprising:a speech input section which receives speech uttered by a speaker at different positions and generates speech signals corresponding to the different positions; a frequency analyzer section which frequency-analyzes the speech signals in units of channels of the speech signals to output frequency components for a plurality of channels; a first beam former processor section which suppresses arrival noise other than a target speech by adaptive filtering using the frequency components for the plurality of channels to output the target speech; a second beam former processor section which suppresses the target speech by adaptive filtering using the frequency components for the plurality of channels to outputting noise; a noise direction estimating section which estimates a noise direction from filter coefficients calculated by the first beam former processor section; a target speech direction estimating section which estimates a target speech direction from filter coefficients calculated by said second beam former processor section; a target speech direction correcting section which corrects a first input direction as an arrival direction of the target speech to be input in said first beam former processor section on the basis of the target speech direction estimated by said target speech direction estimating section; and a noise direction correcting section which corrects a second input direction as an arrival direction of noise to be input in said second beam former processor section on the basis of the noise direction estimated by said noise direction estimating section.