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On Tone Colouration through Acoustic Feedback in Public Address Systems

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The work describes the incidence of tone colouration in back-coupled public address systems whose loop-circuit-amplification is not very small in comparison with the value which arises from self-excitation. The overlying theory is described, simulating the steady state responses with a digital computer as well as the results of the measured threshold amplification for tone colour from hearing research investigations. The absolute perceptible threshold for tone colour amounts to about − 12 to − 13 dB, the threshold for distinct tone colour in speech is about − 5 dB, both being with respect to the critical loop amplification of self-excitation.
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Document Type: Research Article

Publication date: November 1, 1976

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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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