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. 20, 2018
Filed:
Jul. 22, 2013
Yamaha Corporation, Hamamatsu-shi, JP;
Jun Ishii, Hamamatsu, JP;
Kenta Ohnishi, Hamamatsu, JP;
YAMAHA CORPORATION, Hamamatsu-Shi, JP;
Abstract
An audio signal that is output from a sound source circuit () is caused to flow through a coil () in a transducer for vibrating a soundboard, and the vibration of the soundboard generates an acoustic signal. A microcomputer () calculates a temperature of the coil () with high accuracy by inputting an ambient temperature (Ta) detected by an ambient temperature sensor () and a voltage (V) applied to the coil () and executing computation based on a thermal equivalent circuit of an acoustic signal converter using the ambient temperature and the voltage that are input thereto, the computation including calculation of an amount of electric power consumed in the coil () using the input voltage.