tailieunhanh - Báo cáo hóa học: " Research Article A Two-Microphone Noise Reduction System for Cochlear Implant Users with Nearby Microphones—Part I: Signal Processing Algorithm Design and Development"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article A Two-Microphone Noise Reduction System for Cochlear Implant Users with Nearby Microphones—Part I: Signal Processing Algorithm Design and Development | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2008 Article ID 647502 9 pages doi 2008 647502 Research Article A Two-Microphone Noise Reduction System for Cochlear Implant Users with Nearby Microphones Part I Signal Processing Algorithm Design and Development Martin Kompis 1 Matthias Bertram 1 2 Jacques Francois 3 and Marco Pelizzone4 1 Department of ENT Head and Neck Surgery Inselspital University of Berne CH-3010 Berne Switzerland 2Bernafon Inc. Berne CH-3018 Berne Switzerland 3 Laboratoire des Microprocesseurs Ecole d lngenieurs de Geneve 1202 Geneva Switzerland 4 Clinique . Hôpital Universitaire de Geneve 1211 Geneva Switzerland Correspondence should be addressed to Martin Kompis Received 27 November 2007 Accepted 20 March 2008 Recommended by Chein-I Chang Users of cochlear implant systems that is of auditory aids which stimulate the auditory nerve at the cochlea electrically often complain about poor speech understanding in noisy environments. Despite the proven advantages of multimicrophone directional noise reduction systems for conventional hearing aids only one major manufacturer has so far implemented such a system in a product presumably because of the added power consumption and size. We present a physically small intermicrophone distance 7 mm and computationally inexpensive adaptive noise reduction system suitable for behind-the-ear cochlear implant speech processors. Supporting algorithms which allow the adjustment of the opening angle and the maximum noise suppression are proposed and evaluated. A portable real-time device for test in real acoustic environments is presented. Copyright 2008 Martin Kompis et al. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. INTRODUCTION Cochlear implant systems that is devices .

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