发明名称 |
Acoustic apparatus |
摘要 |
According to one embodiment, an amplitude modulation unit generates a first signal by modulating an amplitude of a carrier wave signal having a frequency of an ultrasonic band, based on an acoustic signal. A phase control unit generates a second signal and a third signal by controlling a phase of the first signal. Respective phases of the second signal and the third signal are approximately opposite. A first parametric loudspeaker radiates a first sound wave toward a first control point, based on the second signal. A first reflection unit has a first concave to receive a sound wave and reflect the sound wave toward the first control point. A focal point of the sound wave reflected by the first concave is the first control point. A second parametric loudspeaker radiates a second sound wave toward the first concave, based on the third signal. |
申请公布号 |
US9301044(B2) |
申请公布日期 |
2016.03.29 |
申请号 |
US201313921694 |
申请日期 |
2013.06.19 |
申请人 |
Kabushiki Kaisha Toshiba |
发明人 |
Takayasu Toshiki;Nishimura Osamu |
分类号 |
H04R1/40;H04R1/34 |
主分类号 |
H04R1/40 |
代理机构 |
Amin, Turocy & Watson, LLP |
代理人 |
Amin, Turocy & Watson, LLP |
主权项 |
1. An acoustic apparatus comprising:
an amplitude modulation unit configured to generate a first signal by modulating an amplitude of a carrier wave signal having a frequency of an ultrasonic band, based on an acoustic signal; a phase control unit configured to generate a second signal and a third signal by controlling a phase of the first signal, respective phases of the second signal and the third signal being approximately opposite; an amplification unit configured to amplify the second signal and the third signal; a first parametric loudspeaker configured to radiate a first sound wave toward a first control point located on a directional axis of the first parametric loudspeaker, based on the amplified second signal, the directional axis being a normal line passing through a center of a radiation surface of the first parametric loudspeaker; a first reflection unit having a first concave to receive a sound wave and reflect the sound wave toward the first control point, a focal point of the sound wave reflected by the first concave being the first control point; and a second parametric loudspeaker configured to radiate a second sound wave toward the first concave, based on the amplified third signal, wherein the amplification unit amplifies the second signal and the third signal so that a sound pressure of the first sound wave is approximately equal to a sound pressure of the second sound wave at the first control point. |
地址 |
Tokyo JP |