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Acoustic Signal Expansion in Multiple Trigonometric Bases

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A method of time-frequency analysis of the acoustic signals is presented. It is conceptually and computationally simple and its parameters are easily adjustable. By an appropriate adjustment of its time-frequency parameters it is possible to achieve characteristics approximating those of the auditory system. This is a very desirable feature when signals received by the ear are analysed. The method proposed also approximates an orthogonal expansion system, with easy near-perfect invertibility as a main advantage. It involves bandpass filtering of the signal and then performing independent analyses of bandpass signals in orthogonal trigonometric expansion bases. The results can be combined into one consistent data-base. An efficient two-dimensional graphic presentation of the results, revealing details relevant to the ear has been achieved with this method. Several examples of analyses for music and speech signals are presented.
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Document Type: Research Article

Publication date: July 1, 2002

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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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