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:
Jul. 21, 2009
Filed:
Jun. 25, 2002
Paul R. Ambourn, St. Paul, MN (US);
Paul R. Ambourn, St. Paul, MN (US);
Phantom Technologies, Inc., St. Paul, MN (US);
Abstract
A two channel surround sound audio circuit (surround sound circuit) includes a first amplifier, a second amplifier, two polarized input capacitors, and two polarized output capacitors. A first input line is coupled through one polarized input capacitor to a positive terminal of the second amplifier and to a negative terminal of the first amplifier. A second input line is coupled through the other polarized input capacitor to a positive terminal of the first amplifier and to a negative terminal of the second amplifier. The output of the first and second amplifier are connected to the first and second polarized output capacitors, respectively. A second embodiment of the surround sound circuit includes two amplifiers, two inverting amplifiers, and two balancing potentiometers. The output of a single amplifier is balanced with the output of a single inverting amplifier with a single balancing potentiometer.