Xmos Limited

Sam Chesney

Andrew Stanford-Jason

Hendrik Lambertus Muller

A method of using a directional microphone unit having an array of constituent microphones. Each of a plurality of the microphones receives substantially white noise via a direct path from a source, and also receives an echo comprising a reflection of the white noise from at least one surface, thereby obtaining a received noise signal comprising a combination of the directly-received noise and the echo. For each of the plurality of microphones, a spacing is identified between lobes and/or troughs in a respective spectrum of the received noise signal as received by the respective microphone, thereby determining an additional distance travelled by the echo to the respective microphone relative to the direct path. A direction of the source is calculated based on the additional distance travelled for each of said plurality of microphones.

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Abergavenny Monmouthshire, United Kingdom

Sam Chesney