Near-sound-field propagation based on individual beam-steering for carrier and sideband waves with parametric array loudspeaker

Abstract

It is very important to provide a personal audible space (audio spot) to listeners. Near-sound-field propagation with a large scale system has been proposed to realize it. In addition, the parametric loudspeaker has been proposed in order to provide an audio spot. It is a small scale system, but the conventional parametric loudspeaker has difficulty in reproducing the audible sound only to near-field. In this paper, we therefore propose a new near-sound-field propagation based on individual beam-steering for the carrier and sideband waves using the parametric loudspeaker. In the proposed method, their waves are emitted to different directions using a parametric array loudspeaker. The method can realize the near-sound-field propagation because the audible area, which their waves are composited, is limited near to the parametric array loudspeaker. Finally, we evaluate the effectiveness of the proposed method through the evaluation experiments.