Automatically controlled amplifier arrangement

Details Automatically controlled amplifier arrangement Automatically controlled amplifier arrangement

1987-02-17

1988-11-08

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

047838191

ABSTRACT:
An automatically controlled amplifier arrangement comprises a controlled amplifier unit (35), a detection unit (2) for detecting oscillations of the arrangement in the case of acoustic feedback during operation, and a control unit (3) which, in response to the detection unit (2), controls the gain of the amplifier unit (35). The controlled amplifier unit comprises separate control means for separately controlling the gain for different frequency bands (1', 1", 1'") below the howling limit. Prior to this a pre-adjustment is effected. Further, a circuit is proposed which increases the gain during preadjustment until oscillation occurs and which subsequently reduces the gain (if desired for each frequency band) until an adjustable margin below the howling limit is obtained (if desired for each frequency band).

REFERENCES:
patent: 4064462 (1977-12-01), Goethler et al.
patent: 4079199 (1978-03-01), Patronis, Jr.
patent: 4088834 (1978-09-01), Thurmond
patent: 4602337 (1986-07-01), Cox

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