An adaptive subband differential microphone

Robust microphone arrays using subband adaptive filters

A new adaptive beamformer which combines the idea of subband processing and the generalized sidelobe canceller structure is presented. The proposed subband beamformer has a blocking matrix that uses coefficient-constrained subband adaptive filters to limit target cancellation within an allowable range of direction of arrival. Simulations compare the fullband adaptive beamformer and the subband ...

A Simple Adaptive First-Order Differential Microphone

First- and Second-order Adaptive Differential Microphone Arrays

Whenever undesired noise sources are spatially nonstationary, conventional directional microphone technology has its limits in terms of interference suppression. Adaptive differential microphone arrays (ADMAs) with their null steering capabilities promise better performance. This contribution introduces and examines firstand second-order ADMAs based on fullband as well as on subband algorithms....

An oversampled subband adaptive filter without cross adaptive filters

Recently a new real-valued oversampled filter ba.nk has be:cm proposed which reduces the “inband” alias. The filterba.nk consists of at least three rhannels whirh are subsa.mpled by different subsampling ratios. Tn this paper we investigate into the applicability of t.his filterbank for adaptive subband filtering a.nd compa.rc the setup with existing subband and fullba.nd techniques. input sign...

A Subband Adaptive Filter

Recently a new real-valued oversampled filter bank has been proposed which reduces the “inband” alias. The filter bank consists of at least three channels which are subsampled by different subsampling ratios. In this paper we investigate into the applicability of this filter bank for adaptive subband filtering and compare the setup with existing subband and fullband techniques.