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: Partial Equalization of Non-Minimum-Phase Impulse Responses | Hindawi Publishing Corporation EURASIP Journal on Applied Signal Processing Volume 2006 Article ID 67467 Pages 1-8 DOI ASP 2006 67467 Partial Equalization of Non-Minimum-Phase Impulse Responses Ahfir Maamar 1 Izzet Kale 2 3 Artur Krukowski 2 4 and Berkani Daoud5 1 Department of Informatics University ofLaghouat BP 37G Laghouat 03000 Algeria 2 Department of Electronic Systems University of Westminster 115 New Cavendish Street London W1W6UW UK 3 Department of Electronic Systems Eastern Mediterranean University Gazimagusa Mersin 10 Cyprus 4 National Center of Scientific Research Demokritos Agia Paraskevi Athens 153 10 Greece 5 Department of Electronics Ecole Nationale Polytechnique BP 182 Algiers 16000 Algeria Received 1 March 2005 Revised 5 December 2005 Accepted 26 February 2006 Recommended for Publication by Piet Sommen We propose a modified version of the standard homomorphic method to design a minimum-phase inverse filter for non-minimum-phase impulse responses equalization. In the proposed approach some of the dominant poles of the filter transfer function are replaced by new ones before carrying out the inverse DFT. This method is useful when partial magnitude equalization is intended. Results for an impulse response measured in the car interior show that by using the modified version we can control the sound quality more precisely than when using the standard method. Copyright 2006 Hindawi Publishing Corporation. All rights reserved. 1. INTRODUCTION In sound-reproduction systems an equalization filter is often used to modify the frequency spectrum of the original source before feeding it to the loudspeaker. The purpose is to make the impulse response of the equalized sound-reproduction chain as close as possible to the desired one 1 . In principle the direct inversion of mixed-phase or non-minimumphase measured impulse responses of the systems is not possible since it leads to unstable equalization filter realizations. Since any mixed-phase impulse .
