Patent ID: 8488411

Claim:
An apparatus comprising: a mobile communications device housing having integrated therein: a downlink channel processor to receive an incoming signal from a far end user; a speakerphone speaker coupled to an output of the downlink channel processor to receive the incoming signal from the far end user and to output a speakerphone acoustic signal; a first microphone to pick up voice of a near end user and to output a voice signal of the near end user; an uplink channel processor to send the voice signal of the near end user to the far end user; a second microphone to pick up the speakerphone acoustic signal and to output an audio signal; and an audio signal processor to measure a time domain level of the audio signal to detect a proximity of the apparatus to an object, and wherein the audio signal processor is configured to compare the time domain level measurement to a threshold level to determine the proximity of the apparatus to the object.