Application of Multiresolution Analyses for Stop Consonants in a Cochlear Implant Model
The classical Fourier transform with sliding time window may be inefficient for the characterisation of short events in speech, such as stop consonants, because of a non-adapted time-frequency compromise. In order to investigate this hypothesis, the basic Fourier analysis was compared to two multiresolution methods: a double Fourier transform with two simultaneous windows, varying in size, and a wavelet representation. Our signal processing was tested on the six French stop consonants according to a model of the French cochlear implant Digisonic (which uses the basic Fourier analysis). The stop consonants were analysed with both multiresolution methods, and then processed using cochlear implant specific processing. An automatic recognition was performed, and simulations of stop consonants perceived by implantees were presented to normal-hearing subjects. The results have not shown an improvement with the multiresolution techniques over the classical FFT analysis.
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Document Type: Research Article
Publication date: 2003-01-01
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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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