Patent ID: 8116482
Filing Date: 2012-02-14
Classification: H04R

Abstract:
1. A microphone for detecting sound and for reducing noise that interferes with the sound, comprising: microphone circuitry for detecting the desired sounds; wherein the microphone circuitry comprises at least one emitter for generating a high frequency acoustic field, such that the high frequency acoustic field is mixed with the sound, thereby providing a mixed signal having a high frequency acoustic carrier and the sound as sideband signals, and at least one receiver positioned relative to the emitter such that it receives the mixed signal; wherein the emitter and the receiver are spaced and opposed at opposite ends of a straight acoustic path; wherein the at least one receiver has an aperture less than several wavelengths of the high frequency acoustic field; and wherein the emitter and receiver are spaced to reinforce reflected interaction of the high frequency and sound signals between them.