Active noise reduction system

Details Active noise reduction system Active noise reduction system

1988-06-24

1991-01-15

Isen, Forester W.

Electrical audio signal processing systems and devices

Hearing protectors, electrical

381 71, A61F 1102

Patent

active

049859250

ABSTRACT:
Improvement in active noise reduction based on a negative feedback electro-acoustical system which consists of an Electronic Earplug seated in the concha fossa combining active and passive noise reduction in the quiet zone at the ear, a bilateral transducer circuit which drives a speaker as an acoustical velocity source, a shunt feedback control filter network which improves stability and increases noise reduction, and a combined input noise-filter/feedback system. A typical application is in a noisy environment for hearing protection and for improved communication capability, e.g., in vehicular communication, telephone, intercom, hearing aids, and stethoscopes.

REFERENCES:
patent: 4395588 (1983-07-01), Franssen et al.
patent: 4455675 (1984-06-01), Bose et al.
patent: 4622440 (1986-11-01), Slavin
patent: 4677677 (1987-06-01), Eriksson
patent: 4783818 (1988-11-01), Graupe et al.
patent: 4815140 (1989-03-01), Wagner
patent: 4833719 (1989-05-01), Carme et al.
MF10 Universal Monolithic Dual Switched Capacitor Filter, National Semiconductor Data Sheet, (pp. 9-212 to 9-222), circa 1984.

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