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Reverberation Time Control by Direct Feedback

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A system for increasing the reverberation time in halls is described which uses the feedback of a delayed signal. The delay is obtained by the location of a microphone or microphones at a distance from a loudspeaker or loudspeakers, thus using the time taken by the sound to travel the distance between them. Feedback is then used to produce a long decay. Satisfactory results were obtained when this system was used in a small hall. In order to increase the reverberation still further, without instability, a method is used which phase modulates any signal at a very low frequency and thus prevents any build up due to feedback because the phase of that signal is continually changing.
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Document Type: Research Article

Publication date: January 1, 1971

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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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