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Paper Abstract and Keywords
Presentation 2017-03-02 09:00
[Poster Presentation] Three-dimensional directivity control based on circular harmonic modes using a circular loudspeaker array
Koya Sato, Yoichi Haneda (UEC)
Abstract (in Japanese) (See Japanese page) 
(in English) This paper describes a filter design method that enables three-dimensional (3-D) directivity control by using a circular loudspeaker array. Digital filters for the circular array can be designed in the circular harmonic domain as the array is expressed in cylindrical coordinates. However, directivity control in 3-D space cannot be considered because its bases in the circular harmonic domain are expressed only on the x-y plane. Therefore, we measure 3-D directivity patterns when a prototype circular loudspeaker array is driven by each circular harmonic mode. We propose a filter design based on the combination of the measured 3-D directivity patterns as well as a method to suppress filter gains at low frequencies by limiting high order using the L1-norm optimization. We conducted a directivity simulation and a sound distortion experiment to confirm the performance of the proposed method. Our results showed that the proposed method performed better the 3-D directivity control and sound reproduction with little distortion than previous methods.
Keyword (in Japanese) (See Japanese page) 
(in English) circular array / directivity control / circular harmonic expansion / L1-norm / least-squares method / / /  
Reference Info. IEICE Tech. Rep., vol. 116, no. 475, EA2016-119, pp. 213-218, March 2017.
Paper # EA2016-119 
Date of Issue 2017-02-22 (EA, SIP, SP) 
ISSN Print edition: ISSN 0913-5685  Online edition: ISSN 2432-6380

Conference Information
Committee SP SIP EA  
Conference Date 2017-03-01 - 2017-03-02 
Place (in Japanese) (See Japanese page) 
Place (in English) Okinawa Industry Support Center 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Speech, Engineering/Electro Acoustics, Signal Processing, and Related Topics 
Paper Information
Registration To EA 
Conference Code 2017-03-SP-SIP-EA 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Three-dimensional directivity control based on circular harmonic modes using a circular loudspeaker array 
Sub Title (in English)  
Keyword(1) circular array  
Keyword(2) directivity control  
Keyword(3) circular harmonic expansion  
Keyword(4) L1-norm  
Keyword(5) least-squares method  
1st Author's Name Koya Sato  
1st Author's Affiliation The University of Electro-Communications (UEC)
2nd Author's Name Yoichi Haneda  
2nd Author's Affiliation The University of Electro-Communications (UEC)
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Date Time 2017-03-02 09:00:00 
Presentation Time 90 
Registration for EA 
Paper # IEICE-EA2016-119,IEICE-SIP2016-174,IEICE-SP2016-114 
Volume (vol) IEICE-116 
Number (no) no.475(EA), no.476(SIP), no.477(SP) 
Page pp.213-218 
#Pages IEICE-6 
Date of Issue IEICE-EA-2017-02-22,IEICE-SIP-2017-02-22,IEICE-SP-2017-02-22 

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