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:
Jul. 09, 2024
Filed:
Jul. 08, 2022
Alps Alpine Co., Ltd, Tokyo, JP;
Yuji Saito, Fukushima, JP;
Hiroki Toita, Fukushima, JP;
Hiroyuki Taguchi, Fukushima, JP;
Ryosuke Tachi, Fukushima, JP;
Tatsuya Mashiko, Fukushima, JP;
ALPS ALPINE CO., LTD., Tokyo, JP;
Abstract
In a speaker distortion correction device, an input signal passes through a nonlinear-portion correction filter and is input into a linear inverse filter. An output signal from the linear inverse filter is output into a speaker through an amplifier. For the nonlinear-portion correction filter, transfer characteristics (filter coefficients) are set that eliminate distortion due to nonlinear characteristics of the speaker. With a difference, as an error, between vibration of the speaker without distortion relative to an input signal and vibration of a vibration system of the speaker measured by a vibration measurement unit, an adaptive-algorithm execution unit performs an adaptive operation that adaptively updates filter coefficients of the linear inverse filter. When the amplitude of vibration of the vibration system of the speaker measured by the vibration measurement unit deviates from a range that normal relative to an input voltage input into the speaker, a control unit stops the adaptive operation of the adaptive-algorithm execution unit.