tailieunhanh - Báo cáo hóa học: " Research Article Frequency-Domain Adaptive Algorithm for Network Echo Cancellation in VoIP"

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 Frequency-Domain Adaptive Algorithm for Network Echo Cancellation in VoIP | Hindawi Publishing Corporation EURASIP Journal on Audio Speech and Music Processing Volume 2008 Article ID 156960 9 pages doi 2008 156960 Research Article Frequency-Domain Adaptive Algorithm for Network Echo Cancellation in VoIP Xiang Shawn Lin 1 Andy W. H. Khong 1 Milos DoroslovaCki 2 and Patrick A. Naylor1 1 Department of Electrical and Electronic Engineering Imperial College London London SW7 2AZ UK 2 Department of Electrical and Computer Engineering The George Washington University Washington DC 20052 USA Correspondence should be addressed to Xiang Shawn Lin Received 1 November 2007 Accepted 8 April 2008 Recommended by Sen Kuo We propose a new low complexity low delay and fast converging frequency-domain adaptive algorithm for network echo cancellation in VoIP exploiting MMax and sparse partial SP tap-selection criteria in the frequency domain. We incorporate these tap-selection techniques into the multidelay filtering MDF algorithm in order to mitigate the delay inherent in frequency-domain algorithms. We illustrate two such approaches and discuss their tradeoff between convergence performance and computational complexity. Simulation results show an improvement in convergence rate for the proposed algorithm over MDF and significantly reduced complexity. The proposed algorithm achieves a convergence performance close to that of the recently proposed but substantially more complex improved proportionate MDF IPMDF algorithm. Copyright 2008 Xiang Shawn Lin 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 The popularity of voice over internet protocol VoIP coupled with an increasing expectation for natural communication over packet-switched networks has called for improvement in VoIP technologies in recent years. As network systems migrate from .