Method and acoustic signal processing system for interference and noise suppression in binaural microphone configurations

摘要

Method and acoustic signal processing system for interference and noise suppression in binaural microphone configurations The invention claims a method for determining a bias reduced noise and interference estimation ( S n n ) in a binaural microphone configuration (M1, M2) with a right and a left microphone signal (x 1, x 2 ) at a timeframe with a target speaker active. The claimed method comprises the steps of:
- determining the auto power spectral density estimate of the common noise ( S n n ) comprising noise and interference components of the right and left microphone signals (x 1 , x 2 ) and
- modifying the auto power spectral density estimate of the common noise ( S n n ) by using an estimate of the magnitude squared coherence (MSC) of the noise and interference components contained in the right and left microphone signals (x 1 , x 2 ) determined at a time frame without a target speaker active. An acoustic signal processing system and a hearing aid using the method for determining a bias reduced noise and interference estimation are claimed as well. The invention offers the advantage of an improved noise reduction performance of speech enhancement algorithms. Moreover, distortions of both, the target speech signal as well as the residual noise and interference components are reduced.