Title:
SPEAKER CONTROLLER , SIGNAL SUPPLYING DEVICE, AND SPEAKER SYSTEM
Document Type and Number:
WIPO Patent Application WO/2019/142881
Kind Code:
A1
Abstract:
A speaker controller (3) has a switch (380) inserted in the middle of a speaker wiring that supplies a sound signal to a speaker (4), a switch control circuit (300) for retrieving an ON/OFF control signal that indicates the ON/OFF of a switch from an alternating-current signal supplied via the speaker wiring and holding the retrieved signal and controlling the ON/OFF of the switch (380) by the ON/OFF control signal, and a power supply circuit (390) for generating a power supply voltage that actuates the switch control circuit (300) from the alternating-current signal supplied via the speaker wiring.
Inventors:
NORO MASAO (JP)
Application Number:
PCT/JP2019/001358
Publication Date:
July 25, 2019
Filing Date:
January 17, 2019
Export Citation:
Assignee:
YAMAHA CORP (JP)
International Classes:
H04R27/00; H02J13/00; H04R3/12
Foreign References:
| JPS6011590U | 1985-01-26 | |||
| JP2012175151A | 2012-09-10 | |||
| JPH04176299A | 1992-06-23 | |||
| US20120014529A1 | 2012-01-19 | |||
| JPH01272398A | 1989-10-31 | |||
| JP3473803B2 | 2003-12-08 | |||
| JP2018007173A | 2018-01-11 |
Other References:
See also references of EP 3742761A4
Attorney, Agent or Firm:
EIKOH PATENT FIRM, P.C. (JP)
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