公开(公告)号：US20240064462A1

公开(公告)日：2024-02-22

申请号：US18228950

申请日：2023-08-01

Applicant: ALPS ALPINE CO., LTD.

Inventor： Yuji SAITO ,  Hiroyuki TAGUCHI ,  Katsuhiko EGAMI ,  Hiroki TOITA

IPC: H04R3/00 ,  H04R3/08 ,  H04R29/00 ,  H04R9/02

CPC classification number: H04R3/007 ,  H04R3/08 ,  H04R29/001 ,  H04R9/022 ,  H04R2430/01 ,  H04R9/06

Abstract: In implementations of an audio system, when overheating of a speaker is detected, a controller controls first and second selectors to input an audio signal output by an audio source device to a cooling processing section and cause output of the cooling processing section to be output to the speaker. In the cooling processing section, a mixer mixes an audio signal obtained by removing a low-frequency component from the input audio signal by a high-pass filter with a cooling signal at an infrasonic frequency generated by a cooling signal generator and adjusted with a gain by a gain adjuster. An audio signal obtained by mixing the audio signal with the cooling signal is output from the cooling processing section via a nonlinear inverse filter. A gain setting section sets the gain such that power of the cooling signal matches power of the low-frequency component extracted by a low-pass filter.