Noise cancellation apparatus

Details Noise cancellation apparatus Noise cancellation apparatus

1994-11-14

1997-09-30

Oh, Minsun

Electrical audio signal processing systems and devices

Directive circuits for microphones

381 71, 381 94, 379387, 379419, H04R 300

Patent

active

056733259

ABSTRACT:
Apparatus for reducing acoustic background noise for use with a telephone handset or a boom microphone device or a boom headset or the like. The apparatus includes first and second microphones which are arranged such that the first microphone receives a desired speech input and the background noise present in the vicinity of the speech, and the second microphone receives substantially only the background noise. The background noise from the second microphone is converted into a corresponding electrical signal and subtracted from a signal corresponding to the speech and background noise obtained from the first microphone so as to produce a signal representing substantially the speech.

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