Gain control circuit

Details Gain control circuit Gain control circuit

1981-03-23

1983-12-20

Mullins, James B.

Amplifiers

With control of power supply or bias voltage

With control of input electrode or gain control electrode bias

330141, 330281, 333 14, H03G 700

Patent

active

044220499

ABSTRACT:
A gain control circuit, which has particular utility in a compressor or expander of a noise reduction circuit, is comprised of first and second detectors for detecting the output signal from a variable gain amplifier and providing respective detector outputs for charging first and second capacitors, respectively. Such first and second capacitors have discharge paths in which first and second resistors are respectively interposed, and the charge on the first capacitor is employed as a control signal for determining the gain of the variable gain amplifier. Further, the first resistor is connected between the first and second capacitors so that the discharge current through the first resistor is dependent on the difference between the charge voltages on the first and second capacitors, whereby a relatively long recovery time can be obtained without adversely affecting the attack time even when the input signal to the variable gain amplifier is of low level.

REFERENCES:
patent: 3790896 (1974-02-01), Shimizu et al
patent: 3848194 (1974-11-01), Nishimura et al.
patent: 4250471 (1981-02-01), Duncan

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