tailieunhanh - Báo cáo hóa học: " Research Article Pitch Ranking, Melody Contour and Instrument Recognition Tests Using Two Semitone Frequency Maps for Nucleus Cochlear Implants"

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 Pitch Ranking, Melody Contour and Instrument Recognition Tests Using Two Semitone Frequency Maps for Nucleus Cochlear Implants | Hindawi Publishing Corporation EURASIP Journal on Audio Speech and Music Processing Volume 2010 Article ID 948565 16 pages doi 2010 948565 Research Article Pitch Ranking Melody Contour and Instrument Recognition Tests Using Two Semitone Frequency Maps for Nucleus Cochlear Implants Sherif A. Omran 1 2 Waikong Lai 1 and Norbert Dillier1 1ENT Department University Hospital Zurich Frauenklinikstrasse 24 8091 Zurich Switzerland 2Institute of Neuroinformatics University of Zurich Winterthurerstrasse 190 8057 Zurich Switzerland Correspondence should be addressed to SherifA. Omran Received 12 August 2010 Accepted 21 November 2010 Academic Editor Elmar Noth Copyright 2010 Sherif A. Omran 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. To overcome harmonic structure distortions of complex tones in the low frequency range due to the frequency to electrode mapping function used in Nucleus cochlear implants two modified frequency maps based on a semitone frequency scale Smt-MF and Smt-LF were implemented and evaluated. The semitone maps were compared against standard mapping in three psychoacoustic experiments with the three mappings pitch ranking melody contour identification MCI and instrument recognition. In the pitch ranking test two tones were presented to normal hearing NH subjects. The MCI test presented different acoustic patterns to NH and CI recipients to identify the patterns. In the instrument recognition IR test a musical piece was played by eight instruments which subjects had to identify. Pitch ranking results showed improvements with semitone mapping over Std mapping. This was reflected in the MCI results with both NH subjects and CI recipients. Smt-LF sounded unnaturally high-pitched due to frequency transposition. Clarinet recognition was significantly enhanced with

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