Audio source proximity estimation using sensor array for noise reduction

Estimating the proximity of an audio source (14, 15) is accomplished by transforming audio signals from a plurality of sensors (18, 20) to frequency domain. The amplitudes of the transformed audio signals are then determined. The proximity of the audio source is determined based on a comparison of the frequency domain amplitudes. This estimation permits a device (16) to differentiate between relatively distant audio sources (14) and audio sources (15) at close proximity to the device. The technique can be applied to mobile handsets, such as cellular phones or PDAs, hands-free headsets, and other audio input devices. Devices taking advantage of this ''close proximity'' detection are better able to suppress background noise and deliver an improved user experience.