Efficient filter-bank algorithms with uniform and non-uniform resolution
Summary:
A key component of hearing aids is a matched pair of analysis and synthesis filter banks for frequency discrimination and recombination of sub-band signals, allowing for frequency selective signal manipulation. Especially in the multi-microphone case which requires an analysis filter bank for each microphone the optimisation of filter bank algorithms is crucial to ensure low power consumption of hearing aids. In this project we will investigate new efficient filter bank algorithms. The filter bank specifications must be matched with the limits prescribed by the tolerable perceptible distortions (artefacts). Moreover, all filter bank approaches will be designed for low absolute group delay and group delay distortion, tolerable linear distortion, minimum aliasing due to multi-rate signal processing and, predominantly, for low computational complexity. Finally, the impact of signal and parameter quantisation will be investigated and considered in the eventual choice of the optimum approach.
References:
Vaidyanathan, P.P. (1993): Multirate Systems and Filter Banks. Englewood Cliffs: Prentice Hall.
Alfsmann, D., Göckler, H.G. „Design of Hypercomplex Allpass-Based Paraunitary Filter Banks applying Reduced Biquaternions”, Proc. EUROCON 2005, pp. 92-95, Belgrade, Serbia, 2005.
