Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system
Patent
1987-02-17
1989-03-28
Isen, Forester W.
Electrical audio signal processing systems and devices
One-way audio signal program distribution
Public address system
381 93, H04R 2700
Patent
active
048171603
ABSTRACT:
An amplifier in which the gain (A.sub.i) is automatically controlled to a maximal value comprises means (D.sub.i) for detecting ringing tones and means (V.sub.i) for reducing the gain upon the detection of ringing tones. Also proposed is a circuit (D.sub.i) for detecting ringing tones. A dynamic equilibrium can be obtained by alternately reducing the gain in the event of ringing tones and raising the gain in the absence of ringing tones.
REFERENCES:
patent: 4079199 (1978-03-01), Patronis, Jr.
patent: 4088834 (1978-05-01), Thurmond
patent: 4525856 (1985-06-01), Admiraal et al.
patent: 4602337 (1986-07-01), Cox
De Koning Stephanus H.
Verwijmeren Alexander
Franzblau Bernard
Isen Forester W.
U.S. Philips Corp.
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