The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 24, 1979
Filed:
Dec. 22, 1977
David L Funston, Batavia, NY (US);
Zachariah H Milburn, Jr, Amherst, NY (US);
GTE Sylvania Incorporated, Stamford, CT (US);
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.