Sound Absorption Measurement in a Circular Tube Using the Echo-Pulse Method
An alternative method for measuring normal-incidence sound absorption coefficients of materials or structures was examined, that is based on the echo-pulse method in a circular tube. The so-called Butterworth impulse was generated in a standing wave tube with a flat frequency response over a wide frequency range. The inverse filtering principle was adopted to compensate for the loudspeaker frequency response at higher and lower frequencies. Two types of acoustical material and structure were employed: glassfibre material and tube exit. Through comparison with the traditional, well-established transfer function method, it can be seen that the new method can be as accurate as the established method. The main errors of this new method result from the accuracy of the measurement of the amplitude of the reflection coefficient of the sample.
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Document Type: Research Article
Publication date: September 1, 2010
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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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