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: Time Delay Estimation in Room Acoustic Environments: An Overview | Hindawi Publishing Corporation EURASIP Journal on Applied Signal Processing Volume 2006 Article lD26503 Pages 1-19 DOI ASP 2006 26503 Time Delay Estimation in Room Acoustic Environments An Overview Jingdong Chen 1 Jacob Benesty 2 and Yiteng Arden Huang1 1 Bell Laboratories Lucent Technologies Murray Hill NJ 07974 USA 2INRS-EMT Universite du Quebec 800 de la Gauchetiere Ouest Suite 6900 Montreal Québec Canada H5A 1K6 Received 31 January 2005 Revised 6 September 2005 Accepted 26 September 2005 Time delay estimation has been a research topic of significant practical importance in many fields radar sonar seismology geophysics ultrasonics hands-free communications etc. . It is a first stage that feeds into subsequent processing blocks for identifying localizing and tracking radiating sources. This area has made remarkable advances in the past few decades and is continuing to progress with an aim to create processors that are tolerant to both noise and reverberation. This paper presents a systematic overview of the state-of-the-art of time-delay-estimation algorithms ranging from the simple cross-correlation method to the advanced blind channel identification based techniques. We discuss the pros and cons of each individual algorithm and outline their inherent relationships. We also provide experimental results to illustrate their performance differences in room acoustic environments where reverberation and noise are commonly encountered. Copyright 2006 Hindawi Publishing Corporation. All rights reserved. 1. INTRODUCTION Time delay estimation TDE which serves as the first stage that feeds into subsequent processing blocks of a system to detect identify and locate radiating sources has plenty of applications in fields as diverse as radar sonar seismology geophysics ultrasonics and communications. It has attracted a considerable amount of research attention ever since sensor arrays were introduced to measure a propagating wavefield. Depending on the nature of its .
