Abstract
In a device having a sound source within an enclosure and a first microphone for picking up sounds outside the enclosure, a system for improving acoustic separation between the sound source and first microphone comprising an additional microphone located approximately equidistant from the sound as the first microphone for picking up sounds within the enclosure, and a circuit connected to the first microphone and the additional microphone for subtracting the sounds within the enclosure from the sounds outside the enclosure.
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