Automatic level control system

Details Automatic level control system Automatic level control system

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.

REFERENCES:
patent: 3555192 (1971-01-01), Hymer
patent: 4068092 (1978-01-01), Ikoma et al.
patent: 4112384 (1978-09-01), Buchberger
patent: 4160873 (1979-07-01), Beseke et al.
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.

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