Noise reducing microphone apparatus

Details Noise reducing microphone apparatus Noise reducing microphone apparatus

1995-04-17

1999-06-29

Kuntz, Curtis

Electrical audio signal processing systems and devices

Noise or distortion suppression

Interpolation

381 92, H04B 1500

Patent

active

059179210

ABSTRACT:
A noise reducing microphone apparatus having an adaptive noise canceller which has a primary input and a reference input and in which the reference input is subtracted from the primary input through an adaptive filter and the adaptive filter is adaptively controlled by an output signal resulted from the subtraction, comprises. The apparatus includes a pair of microphone units disposed in proximate locations; and subtracting means for performing subtraction of outputs from the pair of microphone units. An output from one of the microphone units is supplied as the primary input of the adaptive noise canceller. A differential output from the subtracting means is supplied as the reference input of the adaptive noise canceller.

REFERENCES:
patent: 3803357 (1974-04-01), Sacks
patent: 4427845 (1984-01-01), Yoshida
patent: 4658256 (1987-04-01), Piele
patent: 4912387 (1990-03-01), Moulds, III
patent: 4956867 (1990-09-01), Zurek et al.
Patent Abstracts of Japan, vol. 14, No. 569, Dec. 18, 1990 (Aisin Seiki).

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