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A Method for Estimating SEA Loss Factors

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The loss factors in a SEA system are estimated from a quotient of Complex Modulation Transfer Functions calculated from measured impulse responses in the coupled system. The quasi-steady state SEA power balance equations are considered in the frequency domain and rewritten in the form of power-energy transfer functions. In these transfer functions the dissipation and the coupling can be separated.

Normalizing on the source gives a robust and lower order model and makes it possible to reduce the source. The resulting quotient between energies and the quotient between Complex Modulation Transfer Functions are strongly related at low frequencies. The spatial homogeneity of the modulation within a subsystem is described by a modulation "coherence" function.

Experiments have been carried out in two coupled rooms, and the results are compared with those obtained from decay rate measurements in the decoupled rooms and from a theoretical expression of the coupling loss factor.

Document Type: Research Article

Publication date: July 1, 1997

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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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