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Open Access Auditory Filter Derivation at Low Levels where Masked Threshold Interacts with Absolute Threshold

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This article is Open Access under the terms of the Creative Commons CC BY licence.

This paper reports a notched noise (NN) experiment with a large proportion of low-level, wide-notch conditions where masked threshold asymptotes to a low level that is near, but distinctly above, absolute threshold. The effects of this low level limit on the derivation of auditory filter shape are traditionally mitigated by the inclusion of an arbitrary constant, P 0, in the model of NN masking. We show that the threshold limit can be explained by assuming that there is a noise floor in the cochlea. This more physiological model of masking improves the reliability of filter shape fitting and, if the noise floor is stimulus-level dependent, the fit of the gammachirp (GC) auditory filter model is remarkably good.

© 2018 The Author(s). Published by S. Hirzel Verlag · EAA. This is an open access article under the terms of the Creative Commons Attribution (CC BY 4.0) license (

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Document Type: Research Article

Publication date: September 1, 2018

More about this publication?
  • 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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