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:
May. 15, 2018
Filed:
Jan. 21, 2016
Applicant:
Trigence Semiconductor, Inc., Tokyo, JP;
Inventors:
Akira Yasuda, Tokyo, JP;
Jun-ichi Okamura, Tokyo, JP;
Assignee:
TRIGENCE SEMICONDUCTOR, INC., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03G 11/00 (2006.01); H04R 3/00 (2006.01); H04R 29/00 (2006.01); H03F 99/00 (2009.01); H04R 1/00 (2006.01);
U.S. Cl.
CPC ...
H04R 3/007 (2013.01); H04R 29/003 (2013.01); H04R 1/005 (2013.01); H04R 3/002 (2013.01);
Abstract
A speaker control device in one embodiment includes an oscillator connected in parallel with a drive circuit for driving a speaker, the oscillator changing an oscillation frequency according to a voltage, and a control circuit detecting a variation in the oscillation frequency of the oscillator, and adjusting an amount of current supplied to the speaker by the drive circuit in the case where a variation in the voltage exceeds an allowable value.