Journal ArticleDOI
Acoustic control by wave field synthesis
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TLDR
In this article, the authors proposed a wave front synthesis method based on the Kirchhoff-Helmholtz integral (KHE) integral, where the wave fields of the sound sources on stage are measured by directive microphones; next they are extrapolated away from the stage, and finally they are re-emitted in the hall by one or more loudspeaker arrays.Abstract:
The acoustics in auditoria are determined by the properties of both the direct sound and the later arriving reflections. If electroacoustic means are used to repair disturbing deficiencies in the acoustics, one has to cope with unfavorable side effects such as localization problems and artificial impressions of the reverberant field (electronic flavor). To avoid those side effects, the concept of electroacoustic wave front synthesis is introduced. The underlying theory is based on the Kirchhoff–Helmholtz integral. In this new concept the wave fields of the sound sources on stage are measured by directive microphones; next they are electronically extrapolated away from the stage, and finally they are re‐emitted in the hall by one or more loudspeaker arrays. The proposed system aims at emitting wave fronts that are as close as possible to the real wave fields. Theoretically, there need not be any differences between the electronically generated wave fields and the real wave fields. By using the image source concept, reflections can be generated in the same way as direct sound.read more
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Three-Dimensional Surround Sound Systems Based on Spherical Harmonics
TL;DR: The theory of recording and reproduction of three-dimensional sound fields based on spherical harmonics is reviewed and extended in this paper, where mode-matching and simple source approaches to sound reproduction in anechoic environments are discussed.
Journal ArticleDOI
Binaural cue coding-Part II:Schemes and applications
Christof Faller,Frank Baumgarte +1 more
TL;DR: This paper, Part II, generalizes the basic BCC schemes presented in Part I and includes BCC for multichannel signals and employs an enhanced set of perceptual spatial cues for BCC synthesis.
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The Sonification Handbook
Stefania Serafin,Karmen Franinovic,Thomas Hermann,Guillaume Lemaitre,Michal RInott,Davide Rocchesso +5 more
TL;DR: In this paper, the authors propose a CONCRETE-based approach to solve the problem of concreTE-convexity, i.e., concrete-concrete.
Journal ArticleDOI
Reproduction of a plane-wave sound field using an array of loudspeakers
D.B. Ward,Thushara D. Abhayapala +1 more
TL;DR: A spherical harmonics analysis is used to derive performance bounds on how well an array of loudspeakers can recreate a three-dimensional (3-D) plane-wave sound field within a spherical region of space.
Journal ArticleDOI
Plane-wave decomposition of the sound field on a sphere by spherical convolution
TL;DR: In this article, a theoretical analysis of plane-wave decomposition given the sound pressure on a sphere is presented, where the amplitudes of the incident plane waves can be calculated as a spherical convolution between the pressure on the sphere and another function which depends on frequency and the sphere radius.
References
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Book
Mathematical Methods for Wave Phenomena
TL;DR: Inverse Methods for Reflector Imaging as discussed by the authors, the Dirac Delta Function, Fourier Transforms, and Asymptotics are used for direct scattering problems, and the Wave Equation in Two and Three dimensions.
Journal ArticleDOI
Spatial impression due to early lateral reflections in concert halls: The derivation of a physical measure
M. Barron,A.H. Marshall +1 more
TL;DR: In this article, an extensive series of experiments were conducted with a simulation system to investigate the determinants of the subjective effect created by early lateral reflections, which is called here "spatial impression".
Book
Applied seismic wave theory
TL;DR: In this paper, a broad band experiment is decomposed into monochromatic simulations and the authors derive the Kirchhoff and Rayleigh integrals for inhomogeneous fluid-like media.
Journal ArticleDOI
“Assisted Resonance” in The Royal Festival Hall, London: 1965–1969
P. H. Parkin,K. Morgan +1 more
TL;DR: In this paper, an electronic system (assisted resonance) to lengthen the reverberation time over a limited frequency range was installed experimentally in the Royal Festival Hall, London, and the frequency range covered was extended to 58-700 Hz.