標題: Multi-channel post-filtering based on spatial coherence measure
作者: Hu, Jwu-Sheng
Lee, Ming-Tang
交大名義發表
電機工程學系
National Chiao Tung University
Department of Electrical and Computer Engineering
關鍵字: Coherence;Multi-channel post-filtering;Microphone array;Multi-rank signal model
公開日期: 1-Dec-2014
摘要: A multi-channel post-filtering algorithm using the proposed spatial coherence measure is derived. The spatial coherence measure evaluates the similarity between the measured signal fields using power spectral density matrices. In the proposed post-filter, the assumption of homogeneous sound fields is relaxed. Besides, multi-rank signal models can be easily adopted. Under this measure, the bias term due to the similarity of the desired signal field and the noise field is further investigated and a solution based on bias compensation is proposed. It can be shown that the compensated solution is equivalent to the optimal Wiener filter if the bias or the noise power spectral density matrix is perfectly measured. Simulations with incoherent, diffuse, and coherent noise fields and a local scattered desired source were conducted to evaluate the algorithms. The results demonstrate the superiority of the proposed bias compensated post-filter across different types of noise fields with a more accurate signal model. (c) 2014 Elsevier B.V. All rights reserved.
URI: http://dx.doi.org/10.1016/j.sigpro.2014.04.020
http://hdl.handle.net/11536/25148
ISSN: 0165-1684
DOI: 10.1016/j.sigpro.2014.04.020
期刊: SIGNAL PROCESSING
Volume: 105
Issue: 
起始頁: 338
結束頁: 349
Appears in Collections:Articles