Title:
SPEAKER FAULT DIAGNOSIS DEVICE AND FAULT DIAGNOSIS METHOD
Document Type and Number:
WIPO Patent Application WO/2018/127942
Kind Code:
A1
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).
Inventors:
WATANABE KYOTA (JP)
Application Number:
PCT/JP2017/000029
Publication Date:
July 12, 2018
Filing Date:
January 04, 2017
Export Citation:
Assignee:
MITSUBISHI ELECTRIC CORP (JP)
International Classes:
H04R29/00; B60Q11/00
Foreign References:
| JPH03203492A | 1991-09-05 | |||
| JPH0516889A | 1993-01-26 | |||
| JP2012199854A | 2012-10-18 | |||
| JP2012015717A | 2012-01-19 | |||
| JP2013028232A | 2013-02-07 | |||
| JP2002330498A | 2002-11-15 |
Attorney, Agent or Firm:
TAZAWA, Hideaki et al. (JP)
Download PDF:
Previous Patent: COMPOSITION FOR THE CLEANING OF STONE MATERIAL SURFACES
Next Patent: TRANSMISSION DEVICE AND PATH ADDITION METHOD
Next Patent: TRANSMISSION DEVICE AND PATH ADDITION METHOD