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A Filter-Bank Model for the Detection of Asynchrony Between the Components of a Multitone Complex

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This paper presents a multichannel auditory filter-bank model for asynchrony detection of components in multicomponent tone complexes. The model encompasses the following stages: (1) a bank of bandpass filters; (2) a squaring device and a short-time energy integrator; (3) a logarithmic transformer; (4) a "differentiator" that measures the rate of change in signal level at the stimulus onset or offset; and (5) a decision statistic computed based on the differences in the temporal responses of the filter bands. The model was verified using threshold values measured under a variety of conditions in which one or more components of a tone complex were gated on or gated off asynchronously. The stimuli consisted of harmonic complexes with different phase relations, complexes with different numbers of components equally spaced on a logarithmic frequency scale, and components with different rise or decay times. The best fit of the model to experimental results was observed in onset conditions in which the asynchronous components were gated on before or after the other components of a complex. The predictions based on the model were less accurate in offset conditions when the asynchronous components terminated after the other components, and were least accurate when the asynchronous components terminated before the other components. The multichannel model presented here may be applied to complex forms of asynchrony between the components of a complex.
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Document Type: Research Article

Publication date: September 1, 2004

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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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