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:
Nov. 16, 1982
Filed:
Nov. 26, 1979
Robert Ponto, Louisville, KY (US);
Hardison G Martin, Louisville, KY (US);
Other;
Abstract
A low impedance digital attenuator to selectively attenuate an alternating current composite program signal composed of output program signals from different input channels in accordance with the number of active input signals where each input channel includes an input channel control device to provide an actuating signal when the channel is in selected operating mode and a program output signal. The actuating signals of the channels are summed and converted to a digital signal. The digital signal is supplied to a converter to generate a digital control signal where the relationship between the digital signal and the digital control signal is nonlinear. First and second digital to analog converters are provided to receive the digital control signal and a reference signal. The first digital to analog converter attenuates the composite program signal as a function of the digital control signal and provides an attenuated composite program signal. The second digital to analog converter receives a reference signal and provides a second output composite program. An amplifier having a selected gain is provided to receive the first and second outputs to provide an attenuated program signal.