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. 03, 2020
Filed:
Dec. 16, 2016
Panasonic Intellectual Property Management Co., Ltd., Osaka, JP;
Yasuo Nakata, Kanagawa, JP;
Abstract
A protective device that detects an abnormal current in a driving circuit for driving a speaker includes a sound level detector, a current level detector, and a determination section. The sound level detector detects a sound level of an audio signal output to the driving circuit. The current level detector detects a current level of a current flowing in the driving circuit from a power source. The determination section generates, based on a detection signal of the sound level and a detection signal of the current level, a protection command signal when the current level larger than a second threshold is detected when the sound level of the audio signal is smaller than a first threshold.