Continuously steerable second-order differential microphone arrays

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....

A steerable and variable first-order differential microphone array

A new rst-order di erential microphone array with an in nitely steerable and variable beampattern is described. The microphone consists of 6 small pressure microphones ush-mounted on the surface of a 3/4" diameter rigid nylon sphere. The microphones are located on the surface at points where included octahedron vertices contact the spherical surface. By appropriately combining the three Cartesi...

A Simple Adaptive First-Order Differential Microphone

Aspects of first-order differential microphone arrays in the presence of sensor imperfections

Array processing for broadband signals like speech is not a trivial task. Most sensor arrangements and the related beamforming algorithms show strong frequency dependent characteristics. Differential microphone arrays promise frequency independent high directional gain with compact arrangements. However, this type of microphone array has also the problem that even small deviations in microphone...

Microphone Arrays

Such techniques—known collectively as beamforming—have been the subject of intense interest in recent years within the acoustic array processing research community. Unfortunately, such techniques have been largely ignored in the mainstream automatic speech recognition field, although this may rapidly change given the recent release and widespread popularity of the Microsoft Kinect R © platform....