Title:
PROTECTION DEVICE FOR SOUND SIGNAL CONVERTER
Document Type and Number:
WIPO Patent Application WO/2014/045705
Kind Code:
A1
Abstract:
An audio signal which is outputted from a sound source circuit (14) is passed through a coil (16) within a transducer which oscillates a sound board, and a sound signal is emitted by the oscillation of the sound board. A microcomputer (30) acquires coil temperatures wherein the temperature of the coil (16) is measured with two methods, and if the difference of the two coil temperatures is outside a prescribed range, either interrupts the supply of the audio signal to the coil (16) or reduces the quantity of the audio signal which is supplied. Even if one of the coil temperatures has increased excessively, the microcomputer (30) either interrupts the supply of the audio signal to the coil (16) or reduces the quantity of the audio signal which is supplied.
Inventors:
ISHII JUN (JP)
Application Number:
PCT/JP2013/069819
Publication Date:
March 27, 2014
Filing Date:
July 22, 2013
Export Citation:
Assignee:
YAMAHA CORP (JP)
International Classes:
H04R3/00; G01K7/00; G10H1/32; H02P29/02; H04R29/00
Foreign References:
| JP2004007107A | 2004-01-08 | |||
| JP2008187856A | 2008-08-14 | |||
| JP2010226797A | 2010-10-07 | |||
| JPH03222600A | 1991-10-01 | |||
| JP2008058134A | 2008-03-13 | |||
| JP2008292739A | 2008-12-04 | |||
| JP2007174384A | 2007-07-05 |
Other References:
See also references of EP 2899992A4
Attorney, Agent or Firm:
PROSPEC PATENT FIRM (JP)
Patent business corporation Pros Peck patent firm (JP)
Patent business corporation Pros Peck patent firm (JP)
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