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 Practical Gammatone-Like Filters for Auditory Processing | Hindawi Publishing Corporation EURASIP Journal on Audio Speech and Music Processing Volume 2007 Article ID 63685 15 pages doi 2007 63685 Research Article Practical Gammatone-Like Filters for Auditory Processing A. G. Katsiamis 1 E. M. Drakakis 1 and R. F. Lyon2 1 Department of Bioengineering The Sir Leon Bagrit Centre Imperial College London South Kensington Campus London SW7 2AZ UK 2 Google Inc. 1600 Amphitheatre Parkway Mountain View CA 94043 USA Received 10 October 2006 Accepted 27 August 2007 Recommended by Jont B. Allen This paper deals with continuous-time filter transfer functions that resemble tuning curves at particular set of places on the basilar membrane of the biological cochlea and that are suitable for practical VLSI implementations. The resulting filters can be used in a filterbank architecture to realize cochlea implants or auditory processors of increased biorealism. To put the reader into context the paper starts with a short review on the gammatone filter and then exposes two of its variants namely the differentiated all-pole gammatone filter DAPGF and one-zero gammatone filter OZGF filter responses that provide a robust foundation for modeling cochlea transfer functions. The DAPGF and OZGF responses are attractive because they exhibit certain characteristics suitable for modeling a variety of auditory data level-dependent gain linear tail for frequencies well below the center frequency asymmetry and so forth. In addition their form suggests their implementation by means of cascades of N identical two-pole systems which render them as excellent candidates for efficient analog or digital VLSI realizations. We provide results that shed light on their characteristics and attributes and which can also serve as design curves for fitting these responses to frequency-domain physiological data. The DAPGF and OZGF responses are essentially a missing link between physiological electrical and mechanical models for auditory filtering. Copyright 2007
