Title:
LOUDSPEAKER DEVICE AND WIRELESS COMMUNICATION SYSTEM
Document Type and Number:
WIPO Patent Application WO/2016/051945
Kind Code:
A1
Abstract:
The present invention monitors the sounding state of a speaker even when a discretionary sound is broadcast. A loudspeaker device is configured so as to be provided with: a reception unit for receiving a sound signal and outputting the received signal as a first sound signal; a sound amplification unit for amplifying the first sound signal and outputting the amplified signal as a second sound signal; a speaker for outputting a sound on the basis of the second sound signal; a vibration sensor attached to the speaker, the vibration sensor detecting the vibration of the speaker and outputting the detected vibration as a vibration signal; and a determination unit for processing the vibration signal by Fast Fourier Transformation (FFT), calculating a vibration power spectrum that is the frequency spectrum of the electric power of the vibration signal, processing a third sound signal based on the first sound signal by FFT, calculating a sound signal power spectrum that is the frequency spectrum of the electric power of the third sound signal, and determining whether sound output from the speaker is normal or abnormal on the basis of the correlation of the vibration power spectrum and sound signal power spectrum.
Inventors:
HIGURE KINICHI (JP)
KAJIHARA KUNIHITO (JP)
TAKAHASHI NORIYUKI (JP)
KAJIHARA KUNIHITO (JP)
TAKAHASHI NORIYUKI (JP)
Application Number:
PCT/JP2015/071487
Publication Date:
April 07, 2016
Filing Date:
July 29, 2015
Export Citation:
Assignee:
HITACHI INT ELECTRIC INC (JP)
International Classes:
H04R29/00; H04H20/12; H04H20/61; H04R3/00; H04R27/00
Foreign References:
| JP2010147893A | 2010-07-01 | |||
| JP2012129704A | 2012-07-05 |
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