An audio activity detection apparatus comprises a first sound sensor (101) having a substantiallyomni-directionalsensitivity and providing a first signal and a second sound sensor (101, 103, 105) having a directional sensitivity and providing a second signal. A first adaptive filter (107) filters the second signal to generate a first filtered signal and a first adaptation unit (111) adapts the first adaptive filter (107) to reduce a difference between the first filtered signal and the first signal. A detection unit (113) detects audio activity in response to at least one filter coefficient of the first adaptive filter (107). The invention may allow improved audio detection in many scenarios and may in particular provide improved audio detection for hearing aids using a plurality of microphones. Decorrelated detections of dominant interferers and desired signals may be achieved.
|Publication status||Published - 11 Sep 2008|