115811 - Effect of a chamber orchestra on direct sound and early reflections for performers on stage.pdf (3.17 MB)
Effect of a chamber orchestra on direct sound and early reflections for performers on stage: a boundary element method study
journal contribution
posted on 2023-05-19, 03:46 authored by Lilyan Panton, Damien HollowayDamien Holloway, Cabrera, DEarly reflections are known to be important to musicians performing on stage, but acoustic measurements are usually made on empty stages. This work investigates how a chamber orchestra setup on stage affects early reflections from the stage enclosure. A boundary element method (BEM) model of a chamber orchestra is validated against full scale measurements with seated and standing subjects in an anechoic chamber and against auditorium measurements, demonstrating that the BEM simulation gives realistic results. Using the validated BEM model, an investigation of how a chamber orchestra attenuates and scatters both the direct sound and the first-order reflections is presented for two different sized “shoe-box” stage enclosures. The first-order reflections from the stage are investigated individually: at and above the 250 Hz band, horizontal reflections from stage walls are attenuated to varying degrees, while the ceiling reflection is relatively unaffected. Considering the overall effect of the chamber orchestra on the direct sound and first-order reflections, differences of 2–5 dB occur in the 1000 Hz octave band when the ceiling reflection is excluded (slightly reduced when including the unobstructed ceiling reflection). A tilted side wall case showed the orchestra has a reduced effect with a small elevation of the lateral reflections.
History
Publication title
Acoustical Society of America. JournalVolume
141Issue
4Pagination
2461-2472ISSN
0001-4966Department/School
School of EngineeringPublisher
Acoustical Soc Amer Amer Inst PhysicsPlace of publication
Ste 1 No 1, 2 Huntington Quadrangle, Melville, USA, Ny, 11747-4502Rights statement
Copyright 2017 Acoustical Society of AmericaRepository Status
- Open