Design of matrix wiener filter for noise reduction and speech enhancement in hearing aids

Abstract

This paper proposes an algorithm for matrix wiener filter for speech processing in case of hearing aids. Hearing aid (HA) devices currently used are less efficient as environmental noise already added into speech signal corrupts it and heard by listener. Introducing wiener filter in HA device allows reducing noise to particular level. By increasing number of secondary channels can enhance the performance of the device. Matrix wiener filter is a technique which considers matrix combination of speech and noise correlations and has better performance than multichannel wiener filter. A multi input multi output (MIMO) system having multiple target speech signals is used, it utilizes matrix wiener filter for nullifying noise in speech which estimates the speech coming towards listener. Wiener matrix coefficients are calculated from speech and noise correlation matrices. Simulation results prove that matrix wiener filter performs better compared to multichannel and single channel wiener filter.