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On Microphone Positioning in Electroacoustic Reverberation Enhancement Systems

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Microphone positioning is one of the most important and difficult issues when designing a reverberation enhancement system. This paper first analyses the microphone position relative to the system loudspeakers. It is shown how a microphone can be placed as close to the corresponding loudspeaker as 0.2 times the reverberation distance while keeping almost the same efficiency as that of the diffuse field hypothesis. Results from measurements show that microphone signals are adequately decorrelated when microphones are separated by a distance of the same order as the reverberation distance. The microphone position relative to the stage is then examined. In non-regenerative systems using electronic reverberation, it is shown that microphones have to be placed relatively close to the stage (not further than the reverberation distance) and/or that time variant filters must be used for the decays not to be double-sloped. Acoustic feedback is always far from being negligible in these systems. If no time variant filters are used, the number of channels must be large for the statistical properties of the electroacoustic contribution to be more or less similar to that of a "normal" passive response.
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Document Type: Research Article

Publication date: 2000-09-01

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  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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