rensselaer polytechnic institute. sensinstallation: review the use of spherical speaker arrays and...
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Rensselaer Polytechnic Institute
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SenSInstallation:
Review the use of spherical speaker arrays and sensor-speaker arrays (SenSAs) in performance and installation.
Detail our recent development of “third generation” spherical speaker arrays.
Project the use of these new speakers as a large-scale diffusion array for sound installation and electro-acoustic performance.
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“Alternative Voices for Electronic Sound”Trueman, Bahn, Cook - ICMC 2000, Berlin
“Physicality and Feedback”Bahn, Hahn, Trueman - ICMC 2001, Havana
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SenSInstallation Project Goals:
Construct a new Sensor/Speaker “instrument:”
• Large-scale multi-channel spherical sound system under sensor control.
• Develop the system so that could support many configurations and applications.
• Develop general-purpose spatialization tools for the system.
• Realize numerous pieces ranging from sound installation to electro-acoustic mixed ensemble compositions.
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Conventional Systems:• Covered at SEAMUS 2002 by Beck: A Taxonomy of Sound
Diffusion
• Forward projecting stereo “PA-systems”
• Outside-In, “Surround” configurations
Spherical Speaker Arrays and “SenSAs:” Background
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Conventional Systems:• Surround the audience in order to provide an “immersive”
sonic experience.
• Disassociate the acoustic source of sound production and the electronic image creating a “plane of separation” between acoustic and electronic sources and between electronic sounds and the audience.
• Acoustic sources are absorbed into electronic sound-space, usually via subtle addition of artificial reverberation (sound reinforcement)
Spherical Speaker Arrays and “SenSAs:” Background
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Spherical Systems:
• “Inside-Out,” instrument-like sonic radiation
• Engage natural acoustic qualities of performance spaces
• No “sweet spot”
Spherical Speaker Arrays and “SenSAs:” Background
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Spherical Systems:
• Electronic sources are absorbed into the acoustic sound-space
• Very successful with small chamber music ensembles and in small spaces.
• Often successful with larger ensembles, in large spaces, and in combination with traditional sound-reinforcement systems.
• No “plane-of-separation” between electronic and acoustic sources.
Spherical Speaker Arrays and “SenSAs:” Background
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Spherical speakers have long been applied in the study of
• The acoustic qualities of performance spaces:
Hidaka and Beranek, 1991
• The acoustic qualities of instruments:
Causse, et al., 1992
Roads, 1996
Wessel, 1991
Spherical Speaker Arrays and “SenSAs:” Background
L.A.R.S. speaker used inacoustic analysis of concert halls
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Multi-channel microphone array
Software interface to manipulate and apply impulse response analyses
The “Nbody Project” Cook and TruemanStudies of the directional radiative qualities of acoustic instruments
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Early Spherical Speakers for the Nbody Project
The Bomb
The Boulder
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Trueman’s first “gigging” sphere “R2”
(Ikea salad bowls never sounded better…)
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the “critter”12 discreet channels
individually enclosed drivers
Designed by Dan and Lawrence Trueman
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“Bubba” (Bahn)A 23” 12-channel spherical speaker array
based on the “critter” design
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Second Generation Spherical Speakers
U.S. Enclosures Inc. Fabricated Spheres
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Applications:
Performance Arrays
• Bahn
• Trueman
• “Interface”
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Bahn set-up
“The r!g”
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Trueman set-ups
solo
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Trueman set-ups
Electro-Acoustic mixed ensembles: Trollstilt, Machine Language
“Trollstilt”Dan Trueman &Monica MuganColgate Chapel
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“interface” on stage at OSU Interactive Performance Series
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Applications:Sensor Speaker Arrays: SenSAs
• Trueman: BoSSA
• Cook: DigitalDoo
• Bahn/Hahn: Pikapika
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BoSSA Bowed-Sensor-Speaker-Array
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Cook’s DigitalDoo: a sensor didgeridoo
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Cook’s DigitalDoo: modified spherical speaker
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““Pikapika”Pikapika” a Sensor/ Speaker Performer - Tomie Hahn and Curtis Bahn
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The “SSpeaPer” Interface
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“Strolling:” a wireless sonic performer
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Applications:Multi-channel Arrays and
SenSAs in Installation
• Cook: Perisphere 1• Moore, Engel, Place: Telephonic Displacements• Moore: Cumulosonus
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PariSphere 1Cook
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Multi-channel speaker array forTelephonic Displacements
Moore, Engel, Place
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Cumulosonus 12 channel/ 48 speaker array - Moore
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Third Generation Spherical Speakers
• Due to dissatisfaction with United Enclosures Inc. fabricated spheres, new speakers returned to a modified “critter” design.
• Designed for 2 channel spherical or 1 channel hemispherical applications
• 43 single channel hemispheres produced
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Third Generation Spherical Speakers
Design and fabrication
Jigs created for accuratemass production
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Third Generation Spherical Speakers
Sealing the hemispheres
Preparation for painting
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Third Generation Spherical Speakers
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Third Generation Spherical Speakers
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Third Generation Spherical Speakers
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Third Generation Spherical Speakers
Installing Polk Audio coaxial drivers.
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Initial Tests
First configuration:16 channel 4x4 test grid
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Initial Tests
Currently undergoing rigorous evaluation process…
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Initial Tests
Surveillance dome for soft VNS head tracking
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• 4x4 matrix panning based on “equal power curve” function, later Gaussian or “S-curve.”
• Arbitrary room size and speaker configuration.
• Dynamic placement of sound “objects” within the configuration.
• Scalable sound size or “radius.”
• Hooks for external control of sound object placement.
Initial Software Tests
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Initial Software Tests
Based on Simon Fraser's implementation of Craig Reynolds' Boids algorithm
“Boids,” Eric L. Singer
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Pieces in Progress
• “TerraSonus” Moore Installation of a large-scale navigable sonic landscape
• “struct_1.cg.0” Trueman/Bahn A “Digital Concerto Grosso” for Electronic Duo and Large Chamber Orchestra
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Building new sonic display systems is a very rewardingactivity:
Speakers constitute our “voice” in electronic music yet we rarely engage them on this level when studying electro-acoustic music composition and performance.
This project provides engagement with design, fabrication, acoustics, electronics, programming, and composition. Great class or independent project for students.
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No, we’re not selling them...
We will provide you with plans and information if you want to build some.
Curtis Bahn [email protected]://www.arts.rpi.edu/crb
Stephan Moore [email protected]://www.oddnoise.com/
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Thanks to the Integrated Electronic Arts ProgramRensselaer Polytechnic institute - iEAR Studios.Polk Audio, Inc.
Partners in crime:
David Lublin, Jonathan Marcus - Undergraduate Research Assistants
Scott Smallwood, Dan Trueman, Perry Cook
Interface at the Flea Theater in NYC April 15th, EMF seriesBahn, Trueman, Cook, Hahn, Dubois
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