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:
Sep. 13, 1983
Filed:
Nov. 03, 1980
Burtron D Schertz, Kokomo, IN (US);
Jerry L Glandon, Kokomo, IN (US);
General Motors Corporation, Detroit, MI (US);
Abstract
A bridge audio amplifier is disclosed which includes an input stage for receiving an audio input signal and having a bias amplifier and a signal amplifier which provide a combined output current containing a substantially constant dc component and an ac component which is dependent on the input signal and the relative transconductance of the bias and signal amplifiers. The transconductance of the bias and signal amplifiers is reciprocably varied by a dc control voltage to vary the ac component of the current. The output current is converted to a voltage signal and applied to an output stage for driving a speaker. Two such audio amplifiers driving front and rear speakers may be employed to achieve a low level fade function.