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 Signal Processing Strategies for Cochlear Implants Using Current Steering | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2009 Article ID 531213 20 pages doi 2009 531213 Research Article Signal Processing Strategies for Cochlear Implants Using Current Steering Waldo Nogueira Leonid Litvak Bernd Edler Jorn Ostermann and Andreas Buchner Laboratorium fur Informationstechnologie Leibniz Universitat Hannover Schneiderberg32 30167 Hannove Germany Correspondence should be addressed to Waldo Nogueira waldon@ Received 29 November 2008 Revised 19 April 2009 Accepted 22 September 2009 Recommended by Torsten Dau In contemporary cochlear implant systems the audio signal is decomposed into different frequency bands each assigned to one electrode. Thus pitch perception is limited by the number of physical electrodes implanted into the cochlea and by the wide bandwidth assigned to each electrode. The Harmony HiResolution bionic ear Advanced Bionics LLC Valencia CA USA has the capability of creating virtual spectral channels through simultaneous delivery of current to pairs of adjacent electrodes. By steering the locus of stimulation to sites between the electrodes additional pitch percepts can be generated. Two new sound processing strategies based on current steering have been designed SpecRes and SineEx. In a chronic trial speech intelligibility pitch perception and subjective appreciation of sound were compared between the two current steering strategies and standard HiRes strategy in 9 adult Harmony users. There was considerable variability in benefit and the mean results show similar performance with all three strategies. Copyright 2009 Waldo Nogueira 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 implants are an accepted and effective treatment for restoring hearing sensation to people with .
