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 Subband Affine Projection Algorithm for Acoustic Echo Cancellation System | Hindawi Publishing Corporation EURASIP Journal on Advances in Signal Processing Volume 2007 Article ID 75621 12 pages doi 2007 75621 Research Article Subband Affine Projection Algorithm for Acoustic Echo Cancellation System Hun Choi and Hyeon-Deok Bae Department of Electronic Engineering Chungbuk National University 12 Gaeshin-Dong Heungduk-Gu Cheongju 361-763 South Korea Received 30 December 2005 Revised 14 April 2006 Accepted 18 May 2006 Recommended by Yuan-Pei Lin We present a new subband affine projection SAP algorithm for the adaptive acoustic echo cancellation with long echo path delay. Generally the acoustic echo canceller suffers from the long echo path and large computational complexity. To solve this problem the proposed algorithm combines merits of the affine projection AP algorithm and the subband filtering. Convergence speed of the proposed algorithm is improved by the signal-decorrelating property of the orthogonal subband filtering and the weight updating with the prewhitened input signal of the AP algorithm. Moreover in the proposed algorithms as applying the polyphase decomposition the noble identity and the critical decimation to subband the adaptive filter the sufficiently decomposed SAP updates the weights of adaptive subfilters without a matrix inversion. Therefore computational complexity of the proposed method is considerably reduced. In the SAP the derived weight updating formula for the subband adaptive filter has a simple form as ever compared with the normalized least-mean-square NLMS algorithm. The efficiency of the proposed algorithm for the colored signal and speech signal was evaluated experimentally. Copyright 2007 H. Choi and . Bae. 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 Adaptive filtering is essential for acoustic echo cancellation. .
