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:
Dec. 01, 2015
Filed:
Oct. 31, 2012
Applicant:
Yamaha Corporation, Hamamatsu-shi, JP;
Inventor:
Norihiro Kawagishi, Hamamatsu, JP;
Assignee:
Yamaha Corporation, Hamamatsu-shi, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03F 3/187 (2006.01); H03F 3/68 (2006.01); H03F 3/45 (2006.01);
U.S. Cl.
CPC ...
H03F 3/187 (2013.01); H03F 3/45475 (2013.01); H03F 3/68 (2013.01); H03F 2203/45138 (2013.01); H03F 2203/45522 (2013.01); H03F 2203/45528 (2013.01);
Abstract
An audio output amplifier includes a plurality of amplification circuits that drive a plurality of electroacoustic conversion devices, respectively. Each of the plurality of amplification circuits includes a current detection resistance that is provided between a path of a current which is supplied to the corresponding electroacoustic conversion device; and a current controller that generates a voltage between both ends of the current detection resistance, the voltage being proportional to a voltage value of an audio input signal supplied to the corresponding amplification circuit.