抄録
There have been a number of reports on active noise control (ANC). However, conventional ANC using a voice coil loudspeaker promises attenuation only at targeted local points. Then ANC using a parametric array loudspeaker as a control source is discussed. A parametric array loudspeaker exploits nonlinear interactions of finite amplitude ultrasounds in the air. Characteristics of a parametric array loudspeaker have already been reported by a number of researchers. However, there are few investigations of simulation or experimental result of ANC using a parametric array loudspeaker. This paper addresses control effect of feed forward ANC using a parametric speaker as a control source. The control effect is more than 20dB by ANC using a parametric array loudspeaker as a control source at 1000Hz. Distribution maps of sound pressure of ANC using a conventional speaker and a parametric speaker as a control source are shown by numerical analyses and experiments.
