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- W2108254865 abstract "Hearing impairment may be considered as a serious physical and social handicap. Alleviating hearing impairment is therefore a very challenging application for digital signal processing. The framework of this thesis is the use and development of digital signal processing technique for use in hearing-aid devices. Since the auditory system is a very effective and complex, compensating for the hearing-loss is a very challenging problem. Moreover, hearing-aid is based on miniaturized chips and electro-acoustic devices that force to be subject to certain technology constraints. During our research, we have studied and developed a speech enhancement stage in the hearing-aid using a short-term spectral modification method, the Ephra�m and Malah suppression rule (EMSR). In order to perform the frequency analysis on a perceptually relevant frequency scale, we introduce an adaptation of the EMSR. The frequency scale used in this work, the ERB (Equivalent Rectangular Bandwith) scale, models the resolution of the auditory filters. Hearing-aid can be considered as a closed-loop electro-acoustical system that can become unstable because of the feedback. The main part of this thesis is devoted to feedback cancellation using multi delay adaptive filtering in the transform domain. The last part of this work consist in developing a real-time implementation of the feedback cancellation algorithm previously proposed using a prototype hearing aid." @default.
- W2108254865 created "2016-06-24" @default.
- W2108254865 creator A5020731903 @default.
- W2108254865 date "2004-01-01" @default.
- W2108254865 modified "2023-09-26" @default.
- W2108254865 title "Traitement numérique du signal acoustique pour une aide aux malentendants" @default.
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