NOISE SUPPRESSION APPARATUS AND CONTROL METHOD THEREOF

摘要

A noise suppression apparatus selectively uses an adaptive beamformer and fixed beamformer for each frequency. A direction of a null of the fixed beamformer is determined from a direction of a null automatically formed by the adaptive beamformer. Filter coefficients of the adaptive beamformer based on an output power minimization rule are calculated by a minimum norm method using a norm of the filter coefficients as a constraint. The above selection is made based on, for example, a depth of a null automatically formed by the adaptive beamformer in the selection.

主权项

1. A noise suppression apparatus comprising:
an acquisition unit configured to acquire a plurality of microphone signals acquired by a plurality of microphones; an adaptive beamformer configured to automatically form a null of a beam pattern in a direction of a directional target sound so as to obtain noise-extracted signals by extracting non-directional noise from the plurality of microphone signals; a fixed beamformer configured to form a null of a beam pattern in a designated direction; and a selection unit configured to select said adaptive beamformer or said fixed beamformer as a beamformer to be used for each frequency, wherein the designated direction is determined from a direction of the null automatically formed by said adaptive beamformer.