This paper presents a method for designing a DSP controlled directional array speaker with constant directivity and specified sidelobe level over the wideband frequency by means of the two-dimensional (2-D) Fourier series approximation. The band of constant directivity can be extended in the lower frequency band by using the non-physical area in the 2-D frequency plane, where the target amplitude response of the 2-D filter is set to design the 2-D FIR filter. We discuss that the beamwidth of the array speaker can be narrowed in the more lower frequency band with a modification of the original algorithm by K. Nishikawa, et al.

Authors: Kushida, Koji; Shimizu, Yasushi; Nishikawa, Kiyoshi
Affiliations: Yamaha Corporation; Kanazawa University(See document for exact affiliation information.)
AES Convention: 123 (October 2007) Paper Number: 7310
Publication Date: October 1, 2007 Import into BibTeX
Subject: Signal Processing
Permalink: https://www.aes.org/e-lib/browse.cfm?elib=14367

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