Design of Multichannel Wiener Filter for Speech Enhancement in Hearing Aids and Noise Reduction Technique

This paper proposes an algorithm for design of multichannel wiener filter for the application of hearing aids (HA). Present hearing aid devices amplify the speech signal which is corrupted by disturbances and noise from the same environment, resulting degraded speech quality and less efficiency of such devices. Application of wiener algorithm in HA device provides improved speech quality with less complexity. Noticeably enhanced speech quality can be obtained if multiple wiener filter channels are used. Multichannel wiener filter algorithm for speech considers scalar combination of noise inputs to filter and speech correlations. A single target speech system having multiple noise inputs to the filter is designed for estimation of degrading signal or noise. It allows extraction of pure speech by nullifying the estimated noise from corrupted speech of the pilot channel. Enhanced speech signal can be observed at the output which is available for listener who uses HA device. Filter coefficients are extracted from input noise and corrupted speech correlation matrices.