Microphone Array Post-Processor Using Instantaneous Direction of Arrival

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Provided by: Microsoft
Topic: Hardware
Format: PDF
In this paper, the authors describe a novel algorithm for postprocessing a microphone array's beamformer output to achieve better spatial filtering under noise and reverberation. For each audio frame and frequency bin the algorithm estimates the spatial probability for sound source presence and applies a spatio-temporal filter towards the look-up direction. It is implemented as a real-time post-processor after a time invariant beamformer and it substantially improves the directivity of the microphone array. The algorithm is CPU (Central Processing Unit) efficient and adapts quickly when the listening direction changes.
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