US 12,464,283 B2Granted

Audio system

AssigneeAlps Alpine Co., Ltd.

InventorsYuji Saito, Hiroyuki Taguchi, Katsuhiko Egami, Hiroki Toita

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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.

Claims8

Dependent claims

An audio system having a speaker and an audio source device configured to output a first audio signal, the audio system comprising:

an overheating detector configured to detect occurrence of an overheated state of the speaker;
a cooling processing section configured to output a second audio signal;
a switching section configured to switch an audio signal to be output to the speaker between the first audio signal and the second audio signal;
and
a controller configured to cause the switching section to switch the audio signal to be output to the speaker to the second audio signal when the overheating detector detects the occurrence of the overheated state of the speaker in a state in which the switching section outputs the first audio signal to the speaker;
wherein at least in a state in which the switching section outputs the second audio signal to the speaker, the cooling processing section is configured to output, as the second audio signal, a signal obtained by mixing a signal obtained by removing a low-frequency component from the first audio signal output by the audio source device with a cooling signal at an infrasonic frequency lower than an audible frequency range;
and
wherein the cooling processing section includes a gain adjuster configured to adjust a gain for the cooling signal such that power of the cooling signal output from the gain adjuster matches power of the low-frequency component of the first audio signal output by the audio source device.

5 more elements

An audio system having a speaker and an audio source device configured to output a first audio signal, the audio system comprising:

an overheating detector configured to detect occurrence of an overheated state of the speaker;
a cooling processing section configured to output a second audio signal;
a switching section configured to switch an audio signal to be output to the speaker between the first audio signal and the second audio signal;
and
a controller configured to cause the switching section to switch the audio signal to be output to the speaker to the second audio signal when the overheating detector detects the occurrence of the overheated state of the speaker in a state in which the switching section outputs the first audio signal to the speaker;
wherein at least in a state in which the switching section outputs the second audio signal to the speaker, the cooling processing section is configured to output, as the second audio signal, a signal obtained by mixing a signal obtained by removing a low-frequency component from the first audio signal output by the audio source device with a cooling signal at an infrasonic frequency lower than an audible frequency range;
a temperature detector configured to detect a temperature of the speaker;
wherein when the temperature detector detects a temperature higher than a first threshold value, the overheating detector is configured to detect the occurrence of the overheated state of the speaker;
and
wherein when the temperature detector detects a temperature equal to or lower than a second threshold value equal to or lower than the first threshold value in a state in which the switching section outputs the second audio signal to the speaker, the controller is configured to cause the switching section to switch the audio signal to be output to the speaker to the first audio signal.

7 more elements

Dependencies are inferred from the claim text.