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A new method of computing acoustical filters

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A new method of computing the sound reflection and transmission of acoustical filters which does not depend on the image parameter theory is presented. The transmitted and reflected sound pressure propagating along a duct with n equal filter sections connected in cascade is represented by the characteristic factors of one section which consists of a so-called symmetrical discontinuity with a duct piece of arbitrary length connected to the input and output. In loss-free cases the sound transmission and reflection can be found with the aid of diagrams. It is shown how the new method differs from the image parameter theory and that it is superior in cases of a small number of practically loss-free filter sections which are terminated by a non-reflecting duct system. The sound reflection and transmission of a filter with a reflecting output duct can be easily derived from the fundamental case with a non-reflecting terminal and this method can also be applied to filters that are terminated by non-equal sections.
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Document Type: Research Article

Publication date: January 1, 1954

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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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