1. A method for detecting own voice activity by a speaker using a microphone having a near field channel with the speaker covering a distance of 30 cm or less, comprising: a processor extracting a near-field signature from signals generated from a plurality of different voices applied to the near-field channel by using general mutual interdependence analysis (GMIA); the microphone generating a speaker signal from a voice of the speaker; the processor extracting a channel signature from the speaker signal by applying GMIA; the processor comparing the channel signature with the near-field signature to determine a channel used by the speaker.