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Motivation

Below are some examples of the high-frequency sound of different appliances.

no appliance

blank.png

TV

TV.png

TV set top box

TV set top box.png

HP printer

printer.png

router

wifi.png

modem

modem.png

Huawei(charging)

huawei_charge.png

Huawei(not charging)

huawei_not charge.png
ipad_not charge.png

iPad(not charging)

ipad_charge.png

iPad(charging)

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