Electrical audio signal processing systems and devices – Feedback suppression
Patent
1988-02-04
1989-07-04
Chin, Tommy P.
Electrical audio signal processing systems and devices
Feedback suppression
381 231, 381 68, 381121, H04R 302, H04M 120
Patent
active
048457574
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: 4054462 (1977-12-01), Goehler
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
Excerpt from "A Feedback Stabilizing Circuit for Hearing Aids," Preves et al, Hearing Instruments, vol. 37, No. 4, pp. 34, 36-41, 51.
Manual for RIM-Elektronik Automatic Feedback Filter.
"Halbleiter-Schaltungstechink," von Tietze et al (1985), pp. 419-421.
Chin Tommy P.
Siemens Aktiengesellschaft
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