Circuit arrangement for suppressing oscillations

Details Circuit arrangement for suppressing oscillations Circuit arrangement for suppressing oscillations

1988-02-04

1989-03-21

Chin, Tommy P.

Electrical audio signal processing systems and devices

Feedback suppression

381 83, H04M 120, H04R 302

Patent

active

048151408

ABSTRACT:
A circuit arrangement for suppressing oscillations, such as acoustic feedback in a hearing aid, has a circuit which recognizes the presence of oscillations in a useful signal, an oscillatory frequency search circuit, and an oscillation modifying circuit controlled by the search circuit. The oscillation modifying circuit suppresses oscillations by filtering. Drift effects are avoided by a frequency clamp-on sub-circuit in the search circuit, which retains the frequency of the recognized oscillation at the modifying circuit, even when the oscillatory signal at the input of the search circuit disappears.

REFERENCES:
patent: 4079199 (1978-03-01), Patronis, Jr.
patent: 4091236 (1978-05-01), Chen
patent: 4232192 (1980-11-01), Beex
patent: 4525856 (1985-06-01), Admiraal
patent: 4747144 (1988-05-01), Admiraal
RIM Electronic brochure, "Automatisches Ruckkopplungsfiltergerat AFG" (Automatic Feedback Filter), May 1986.
"Excerpt from Halbleiter-Schaltungstechnik", Tietze et al (1985), pp. 419-421.
"A Feedback Stabilizing Circuit for Hearing Aids", Preves, Hearing Instruments, vol. 37, No. 4, pp. 34, 36-41, and 51.

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