Microphone apparatus

Details Microphone apparatus Microphone apparatus

1993-05-07

1995-11-28

Isen, Forester W.

Electrical audio signal processing systems and devices

Directive circuits for microphones

381 94, H04R 300

Patent

active

054715385

ABSTRACT:
A microphone apparatus having a first microphone for picking up a desired sound and a second microphone with directionality in which sensitivity is low to the desired sound arrival direction. A sound signal from the second microphone is supplied to a subtracting circuit through an adaptive filter. The subtracting circuit subtracts an output signal of the adaptive filter from the sound signal coming from the first microphone. A circuit is provided to adjust the adaptive filter so that the output power of the subtracting circuit is minimized. The setup implements a microphone system which is compact in size and easily provides desired directionality.

REFERENCES:
patent: 4370523 (1983-01-01), Bader
patent: 4589137 (1986-05-01), Miller
patent: 4741038 (1988-04-01), Elko et al.
patent: 4802227 (1989-01-01), Elko et al.
patent: 4888807 (1989-12-01), Reichel
patent: 5033082 (1991-07-01), Eriksson et al.
patent: 5243661 (1993-09-01), Ohkubo et al.

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