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Order Analysis: A Psychoacoustic Approach

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The problem of analysing the audibility of a specified harmonic at rotational speed is a task frequently occurring in the automotive industry. A peak-to-background difference value relative to the level of the background noise which increases with the rotational speed is a suited measure. The calculation of a peak-to-background value is dependent on the used frequency band and on the energy values to be compared. To secure results equivalent to subjective perception, the frequency band is best chosen as a varying gammatone filter centred around the harmonic. Third-octave filters give different results at low frequencies. To compare the energy with and without the harmonic, loudness levels should be determined by calculating level differences only in e.g. a run-up analysis, where the background noise level increases by more than 20 dB, the result would be a changing audibility although an identical peak-to-background difference is assumed.
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Document Type: Research Article

Publication date: September 1, 1999

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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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