Design of Multichannel Spherical Loudspeaker Array for the Spatial Sound Manipulation

Dong-Soo Kang; Jung-Woo Choi; Jung-Min Lee; Yang-Hann Kim

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2012 Vol.31, Issue 4 Preview Page Next Page

Design of Multichannel Spherical Loudspeaker Array for the Spatial Sound Manipulation 소리의 공간 제어를 위한 구형 다채널 스피커 어레이 설계

31 May 2012. pp. 214-224

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Abstract

The objective of this paper is to design multichannel spherical loudspeaker array by considering various positioning methods such as Gaussian grid, Lebedev grid and packing method. For the spatial sound manipulation, which is to make desired sound field by controling multiple sound sources, the Kirchhoff- Helmholtz integral states that sound fields can be reproduced in terms of infinite control sources on the integral surface. But since we cannot control infinite number of sources for the implementation, we have to allocate finite number of sound sources which can approximately act as infinite number of sources. To manipulate sound field inside of a sphere (which is typical example of three dimensional array) by controlling sound sources on the surface, three methods of allocating sound sources, which are Gaussian grid, Lebedev grid and packing method, are reviewed. For each geometry, the performances of manipulation rendered by time-reversal operator and higher-order ambisonics are compared.

Keywords

Spatial sound manipulation

Sound field reproduction

Higher-order ambisonics

Time-reversal operator

Lebedev grid

Loudspeaker array system

본 논문의 목적은 가우스 배치, 레베데프 배치 등 다양한 구 표면의 음원 배치 방법을 고려하여 구형 다채널 스피커 시스템을 설계하는 것이다. 다수의 스피커를 이용하여 원하는 음장을 만들어내는 소리의 공간 제어 (spatial sound manipulation)에 있어, 키르코프-헬름홀츠 적분 방정식 (K-H 적분 방정식)은 표면에 연속적으로 배치된 음원의 음압 및 입자 속도의 제어를 통해 내부의 음장을 제어할 수 있음을 의미한다. 하지만 현실적으로 사용가능한 음원의 수에 제한이 있으므로, 한정된 수의 음원을 표면에 효과적으로 배치하여 연속적으로 배치된 경우를 모사할 필요가 있다. 3차원 형상의 대표적인 예로, 구 표면상에 음원을 배치하여 내부의 음장을 제어할 때, 표면에 음원을 배치하는 다양한 방법들을 검토하고, 각각의 방법들에 대해 시간 역전 연산자와 고차 앰비소닉을 이용한 음장 제어 성능을 비교하였다.

키워드

소리의 공간제어

음장 재현

고차 앰비소닉

시간 역전 연산자

레베데프 구

스피커 어레이

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Information

Publisher :The Acoustical Society of Korea
Publisher(Ko) :한국음향학회
Journal Title :The Journal of the Acoustical Society of Korea
Journal Title(Ko) :한국음향학회지
Volume : 31
No :4
Pages :214-224
Received Date : 2012-01-30
Accepted Date : 2012-03-15

The Journal of the Acoustical Society of KoreaISSN:1225-4428(Print) 2287-3775(Online)한국음향학회

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