Dynamic verification gate circuit

Details Dynamic verification gate circuit Dynamic verification gate circuit

1984-04-16

1986-03-25

LaRoche, Eugene R.

Amplifiers

With semiconductor amplifying device

Including gain control means

330141, 330279, H03G 310

Patent

active

045786488

ABSTRACT:
A circuit for automatically controlling the operation of a variable gain control circuit in an audio signal processing system by verifying whether gain change is desirable and then gating the operation of the gain control circuit is disclosed. A pair of operational amplifiers along with a set of four diodes produce two equal absolute value signals representing a full wave rectified version of the audio input signal. A first filter circuit processes one of the absolute value signals to produce a third signal corresponding to average signal amplitude. A second filter circuit processes the other absolute value signal to produce a fourth signal corresponding to an average of peak values. A comparator compares the third and fourth signals and produces an output signal which is used as the control signal for controlling the variable gain control circuit.

REFERENCES:
patent: 3488604 (1970-01-01), Smilowitz
patent: 4371842 (1983-02-01), Lee
patent: 4471317 (1984-09-01), Nilsson et al.

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