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1. (WO2018127942) SPEAKER FAULT DIAGNOSIS DEVICE AND FAULT DIAGNOSIS METHOD

Pub. No.:    WO/2018/127942    International Application No.:    PCT/JP2017/000029
Publication Date: Fri Jul 13 01:59:59 CEST 2018 International Filing Date: Thu Jan 05 00:59:59 CET 2017
IPC: H04R 29/00
B60Q 11/00
Applicants: MITSUBISHI ELECTRIC CORPORATION
三菱電機株式会社
Inventors: WATANABE, Kyota
渡邊 匡太
Title: SPEAKER FAULT DIAGNOSIS DEVICE AND FAULT DIAGNOSIS METHOD
Abstract:
A fault diagnosis device (1) for a speaker (4) is provided with: a signal determination unit (1-4) for determining an output level of a diagnostic signal in an audible band; a timing determination unit (1-3) for determining a timing at which a noise level in a vehicle is greater than the output level of the diagnostic signal determined by the signal determination unit (1-4); a signal generation unit (2) for outputting the diagnostic signal from the speaker (4) in the vehicle at the timing determined by the timing determination unit (1-3); an impedance calculation unit (1-5) for calculating the impedance when the speaker (4) outputs the diagnostic signal; a resonance frequency calculation unit (1-6) for calculating the resonance frequency when the speaker (4) outputs the diagnostic signal; and a fault diagnosis unit (1-7) for diagnosing a fault in the speaker (4) using the calculation results from the impedance calculation unit (1-5) and the resonance frequency calculation unit (1-6).