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We describe the geometric and engineering design challenges that were overcome to create a new compact, 10-inch diameter spherical loudspeaker array with integrated class-D amplifiers and a 120 independent channel digital audio interface using Gigabit Ethernet. A special hybrid geometry is used that combines the maximal symmetry of a triangular-faceted icosahedron with the compact planar packing of 6 circles on an equilateral triangle ("billiard ball packing"). Six custom 1.25inch drivers developed by Meyer Sound Labs are mounted on each of 20 aluminum triangular circuit boards. Class D amplifiers for the six speakers are mounted on the other side of each board. Two pentagonal circuit boards in the icosahedron employ Xilinx Spartan 3E FPGA`s to demultiplex digital audio signals from incoming Gigabit Ethernet packets and process them before feeding the class-D modulators. Processing includes scaling, delaying, filtering and limiting.
Author (s): Avizienis, Rimas; Freed, Adrian; Kassakian, Peter; Wessel, David
Affiliation:
CNMAT
(See document for exact affiliation information.)
AES Convention: 120
Paper Number:6783
Publication Date:
2006-05-06
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Session subject:
Loudspeakers and Sound Reinforcement
Permalink: https://aes2.org/publications/elibrary-page/?id=13587
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Avizienis, Rimas; Freed, Adrian; Kassakian, Peter; Wessel, David; 2006; A Compact 120 Independent Element Spherical Loudspeaker Array with Programable Radiation Patterns [PDF]; CNMAT; Paper 6783; Available from: https://aes2.org/publications/elibrary-page/?id=13587
Avizienis, Rimas; Freed, Adrian; Kassakian, Peter; Wessel, David; A Compact 120 Independent Element Spherical Loudspeaker Array with Programable Radiation Patterns [PDF]; CNMAT; Paper 6783; 2006 Available: https://aes2.org/publications/elibrary-page/?id=13587
@article{avizienis2006a,
author={avizienis rimas and freed adrian and kassakian peter and wessel david},
journal={journal of the audio engineering society},
title={a compact 120 independent element spherical loudspeaker array with programable radiation patterns},
year={2006},
number={6783},
month={may},}