Optimized spatial resampling for microphone array beamforming
Due to the specialty of portable devices, the microphone array configurations usually depend on the device manufacturing constraints, and thus are various and generally irregular. It is then more difficult for the algorithm designers to establish a generic processing. The main contribution of this paper is an optimized spatial resampling procedure for beam-forming with irregular 3-D sensor arrays. Beam pattern analysis show that, via spatial resampling, it is possible to apply beamformer coefficients designed for Uniform Linear Array (ULA) to signals captured by arrays having arbitrary configurations and thus carry out beamforming and spatial filtering in both azimuth and zenith directions. Moreover, this algorithm may benefit to other multi-sensor audio processing methods that require specific sensor array configuration.