Amplifiers – With semiconductor amplifying device – Including gain control means
Patent
1982-12-20
1985-04-30
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including gain control means
330134, H03G 330
Patent
active
045147035
ABSTRACT:
An automatic level control system is described for use with a voice processor which generates an AGC control signal to vary the gain applied to an audio input signal. The system includes a dynamically adjusting peak detector for detecting noise peaks and voice peaks while ignoring voice lulls which occur after a voice peak. Detected peaks are processed by an improved voice
oise sensor which develops a first output signal when voice is detected and a second output signal in the absence of detected voice. These output signals are received by a gain control circuit which is adapted to prevent the AGC control signal from increasing system gain for an indefinite interval in response to the second signal, and to permit normal variation in the AGC control signal in response to the first signal.
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patent: 4112384 (1978-09-01), Buchberger
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patent: 4243837 (1981-01-01), Bertholon
patent: 4297527 (1981-10-01), Pate
J. Lewkowicz, "Automatic Gain Control with Equalizer", IBM Tech. Disclosure Bulletin, vol. 21, No. 9, pp. 3569-3570, Feb. 1979.
Maher John W.
Townsend Greg M.
Gillman James W.
Moore John H.
Motrola, Inc.
Mullins James B.
Roney Edward M.
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