Digital gain control system

Details Digital gain control system Digital gain control system

1977-12-22

1979-04-24

Dahl, Lawrence J.

Amplifiers

With semiconductor amplifying device

Including gain control means

330 86, 330129, H03G 310

Patent

active

041514815

ABSTRACT:
A digital gain control system is disclosed. A clock oscillator drives a counter which in turn provides an output to a D/A converter. The analog output of the converter is used to develop a signal for controlling the gain of a gain-controlled amplifier. In order to compensate for the nonlinear gain versus control current characteristic of the amplifier, additional circuitry is employed so that the initial increment in control current, that is, the increment that occurs as the counter goes from the 0000 to the 0001 state, is significantly greater than the remaining increments. In conjunction with volume control circuitry for audio amplifiers, this circuitry assures a muted condition in the 0000 state, and an audio output corresponding to at least the minimum discernible level in the 0001 state.

REFERENCES:
patent: 3961281 (1976-06-01), Woolling, Jr.

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