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Exponential Sweep Check Using Hilbert Transform

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For checking the time-invariant operating properties of fractional-octave-band filters the new standard IEC 61260 proposes the use of exponential swept sine signals. For this reason it is necessary to prove that the applied signal fulfills the requirement that the frequency increases exponentially with time and that in each filter band the same amount of energy is applied. It can be shown that the Hilbert- Transform is able to detect small deviations from linearity which are inherent in some generators with partially linearized exponential sweeps. Using such signals will produce erroneous results when, e.g., a filter bank of a sound level meter is tested using the recommended time-invariant test method.
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Document Type: Research Article

Publication date: July 1, 2014

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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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