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Frequency analysis and synthesis using a Gammatone filterbank

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This paper describes an efficient implementation of the 4th-order linear Gammatone filter [1, 2] based on an impulse-invariant, all-pole design. A linear auditory filterbank is constructed from these filters, which has been used in several applications involving computational auditory peripheral filtering [3, 4, 5, 6, 7, 8, 9]. Additionally, a novel approach to the recombination of the Gammatone filterbank output is introduced that allows for the resynthesis of the signal with a total time delay of 4 ms. The signal reconstruction is nearly perfect, i.e., the difference between input and reconstructed output is barely audible. A detailed technical description of the analysis-synthesis system is given and an implementation using the Matlab programming environment is introduced, which is available online. A possible application of the analysis/synthesis system introduced here is speech processing for hearing aids.
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Document Type: Research Article

Publication date: 2002-05-01

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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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