Binaural noise-reduction techniques based on Multichannel Wiener filter (MWF) have been reported as promissing candidates to be used in binaural hearing aids because of their efficient noise reduction at any arbitrary direction of arrival of the target signal and the preservation of localization cues. The implementation of these techniques have been reported for FFT-based processing and wavelet-packet-based (WP) processing. In these implementations, the processing delay is large and limited to the block processing inherent in the FFT and WP computation. This paper proposes a different implementation for MWF by means of frequency-warped FIR filters, providing a performance near a WP-based MWF and smaller processing delay.

Index Terms: Noise Reduction, Frequency-Warped FIR Filters, Multichannel Wiener Filter (MWF), Binaural Hearing Aids, Latency Reduction