Signal expander with discrimination between close and distant acoustic source

摘要

An apparatus for discriminating between signals produced by a desired acoustic source and an undesired acoustic source includes: a first microphone disposed at a first distance from the desired acoustic source; at least a second microphone disposed at a second distance from the desired acoustic source; a proximity estimation block configured to utilize signals form the first microphone and second microphone to produce a signal representing an estimate of the proximity of the desired acoustic source; and a variable gain block configured to adjust the gain of an output signal from at least one of the microphones by utilizing the estimate of the proximity of the desired acoustic source. A method of discriminating between signals produced by a desired acoustic source and an undesired acoustic source includes: utilizing signals from a first microphone and second microphone to produce an output signal representing an estimate of the proximity of the desired acoustic source; and adjusting the gain of the signal from at least one of the first and second microphones by utilizing the estimate of the proximity of the desired acoustic source.