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 | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2008 Article ID 451273 9 pages doi 2008 451273 Research Article A Two-Microphone Noise Reduction System for Cochlear Implant Users with Nearby Microphones Part II Performance Evaluation Martin Kompis 1 Matthias Bertram 1 2 Pascal Senn 1 Joachim Muller 3 Marco Pelizzone 4 and Rudolf Hausler1 1 Department of ENT Head and Neck Surgery Inselspital University of Berne 3010Bern Switzerland 2Bernafon Inc. 3018 Bern Switzerland 3 ENT clinic of the University of Wurzburg 97080 Wurzburg Germany 4 Clinique . Hôpital Universitaire de Geneve 1211 Geneve Switzerland Correspondence should be addressed to Martin Kompis Received 27 November 2007 Accepted 20 March 2008 Recommended by Chein-I Chang Users of cochlear implants auditory aids which stimulate the auditory nerve electrically at the inner ear often suffer from poor speech understanding in noise. We evaluate a small intermicrophone distance 7 mm and computationally inexpensive adaptive noise reduction system suitable for behind-the-ear cochlear implant speech processors. The system is evaluated in simulated and real anechoic and reverberant environments. Results from simulations show improvements of to dB in signal to noise ratio for rooms with realistic reverberation and more than 18 dB under anechoic conditions. Speech understanding in noise is measured in 6 adult cochlear implant users in a reverberant room showing average improvements of dB when compared to a single omnidirectional microphone or dB when compared to a simple directional two-microphone device. Subjective evaluation in a cafeteria at lunchtime shows a preference of the cochlear implant users for the evaluated device in terms of speech understanding and sound quality. Copyright 2008 Martin Kompis et al. This is an open access article distributed under the Creative Commons Attribution License which permits .
