To provide an audio system utilizing a wireless power transmission system capable of performing power transmission and sound reproduction suitably even when a distance between a loudspeaker and a main body changes.
A transmission side device 1 of a wireless power transmission audio system has: a transmission signal generation part 9 generating a transmission signal formed from a high-frequency signal and a sound signal; a transmission side resonance circuit 91 having a resonance frequency equal to a frequency of the high-frequency signal; a detector 71 detecting change in the transmission signal; and a transmission signal adjustment part 98 controlling a signal waveform of the transmission signal. A loudspeaker 2 has: a reception side resonance circuit 92 receiving at least a part of the transmission signal transmitted from the transmission side resonance circuit 91; and a sound output part 66 reproducing the sound signal. At least one of the transmission side device 1 and the loudspeaker 2 has an impedance adjustment part 96 changing an impedance value of a path where the transmission signal is transmitted, depending on the change in the transmission signal detected by the detector 71.
KAWAMURA JUNICHI
OKAMURA SHUTA
| JP2004336513A | 2004-11-25 | |||
| JP2010141966A | 2010-06-24 | |||
| JP2007049437A | 2007-02-22 | |||
| JP2009153056A | 2009-07-09 | |||
| JP2004336513A | 2004-11-25 | |||
| JP2010141966A | 2010-06-24 | |||
| JP2007049437A | 2007-02-22 | |||
| JP2009153056A | 2009-07-09 |
Osamu Kita
Hidetaka Okabe
Akiko Miyake
Misato Yamaguchi