Abstract
There have been a number of reports on active noise control (ANC). However, conventional ANC using voice coil loudspeaker promises attenuation only at targeted local points. Then ANC using the parametric speaker as a control source is discussed. The parametric speaker exploits the nonlinear interaction of finite amplitude ultrasounds in the air. The characteristics of parametric speakers have already been reported by a number of researchers. However, investigations of simulations or experimental results of ANC using a parametric speaker are sparse. This paper addresses a control effect of feed forward ANC using parametric speaker as a control source. The control effect is more than 20dB by ANC using parametric speaker as a control source at 1000Hz. Neighboring affects of both conventional control source and parametric speaker as a control source used to ANC in the free fields is shown by numerical analysis and experiments.
