Wide-band dereverberation method based on multichannel linear prediction using prewhitening filter

作     者：Okamoto, Takuma Iwaya, Yukio Suzuki, Yoiti 

作者机构：Tohoku Univ Res Inst Elect Commun Aoba Ku Sendai Miyagi 9808577 Japan Tohoku Univ Grad Sch Engn Aoba Ku Sendai Miyagi 9808577 Japan Tohoku Univ Grad Sch Informat Sci Aoba Ku Sendai Miyagi 9808577 Japan 

出 版 物：《APPLIED ACOUSTICS》 (Appl Acoust)

年 卷 期：2012年第73卷第1期

页      面：50-55页

核心收录：

学科分类：07[理学] 082403[工学-水声工程] 08[工学] 070206[理学-声学] 0824[工学-船舶与海洋工程] 0702[理学-物理学] 

基　　金：Japan Society for the Promotion of Science [19-55071] Graduate School of Technology, Tohoku University 

主　　题：Microphone array signal processing Dereverberation LIME algorithm Colored source signal Prewhitening filter 

摘      要：Several dereverberation algorithms have been studied. The sampling frequencies used in conventional studies are typically 8-16 kHz because their main purpose is preprocessing for improving the intelligibility of speech communication and articulation for automatic speech recognition. However, in next-generation communication systems, techniques to analyze and reproduce not only semantic information of sound but also more high-definition components such as spatial information and directivity will be increasingly necessary. To decompose these sound field characteristics with high definition, a dereverberation algorithm that is useful at high sampling frequencies is an important technique to process sound that includes high-frequency spectra such as musical sounds. The LInear-predictive Multichannel Equalization (LIME) algorithm is a promising dereverberation method. Using the LIME algorithm, however, a dereverberation signal cannot be solved at high sampling frequencies when the source signal is colored, such as in the case of speech and sound of musical signals. Because the rank of the correlation matrix calculated from such a colored signal is not full, the characteristic polynomial cannot be calculated precisely. To alleviate this problem, we propose preprocessing of all input signals with filters to whiten their spectra so that this algorithm can function for colored signals at high sampling frequencies. (C) 2011 Elsevier Ltd. All rights reserved.