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 channel signature from signals generated from a plurality of different voices applied to the near-field channel by using general mutual interdependence analysis (GMIA), wherein the near-field channel signature is source independent; 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 channel signature to determine that the near-field channel is used by the speaker.