Near-Field Sound Propagation Based on Individual Delay-Filtering for Carrier and Multiple Sideband Waves with Parametric Array Loudspeaker

Ryosuke KONABE  Daisuke IKEFUJI  Takahiro FUKUMORI  Masato NAKAYAMA  Takanobu NISHIURA  

Publication
A - Abstracts of IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences (Japanese Edition)   Vol.J99-A   No.6   pp.201-210
Publication Date: 2016/06/01
Online ISSN: 1881-0195
DOI: 
Type of Manuscript: PAPER
Category: 
Keyword: 
parametric array loudspeaker,  near-field sound propagation,  carrier wave,  sideband wave,  individual delay-filtering,  

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Summary: 
The parametric loudspeaker has difficulty in reproducing the audible sound only to near-field. In this paper, we therefore propose a near-field sound propagation method based on individual delay-filtering for the carrier and multiple sideband waves. In the proposed method, their waves are emitted to different directions using the parametric array loudspeaker consists of multiple line-type parametric loudspeakers. The method can realize the near-field sound propagation because the audible area, which their waves are composited, is limited near to the parametric array loudspeaker.