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:
Mar. 23, 2021
Filed:
Feb. 15, 2019
Applicant:
Seiko Epson Corporation, Tokyo, JP;
Inventor:
Masayuki Kawakami, Matsumoto, JP;
Assignee:
SEIKO EPSON CORPORATION, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04S 1/00 (2006.01); H03G 7/00 (2006.01);
U.S. Cl.
CPC ...
H04S 1/002 (2013.01); H03G 7/002 (2013.01); H03F 2200/03 (2013.01); H04S 2400/13 (2013.01);
Abstract
A sound output circuit includes an amplifier that amplifies a sound signal, a first terminal for external connection connected to an output terminal of the amplifier, a reference voltage output that outputs a reference voltage, a second terminal for external connection, and a controller that controls a conduction state of an output terminal of the reference voltage output and the second terminal for external connection according to a voltage of the second terminal for external connection.