Near-field spherical microphone array for speech


Etan Fisher and Boaz Rafaely


When close enough to a microphone array, the spherical nature of radiating sources allows for sound field processing in terms of distance as well as direction. As part of an on-going study on beamforming given sources close to a spherical microphone array, radial filters have been developed for attenuating near-field and far-field interference in the source direction. This paper discusses the use of the radial filters for the case of speech. A simulation is presented to demonstrate the desired results. Estimation of near-field source direction and distance is presented for speech signals. Finally, experiments are presented demonstrating radial filtering capabilities given speech signals.

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