改进的梯度向量正交投影声回波对消算法  

Improved acoustic echo cancellation algorithm based on orthogonal projection of gradient vectors

作　　者：邵明义[1] 何培宇[1] 陈佐[1] 

机构地区：[1]四川大学电子信息学院,成都610065

出　　处：《四川大学学报（自然科学版）》2010年第3期548-552,共5页Journal of Sichuan University(Natural Science Edition)

基　　金：国家自然科学基金(60472096)

摘　　要：在梯度向量正交投影算法的基础上,提出一种改进的梯度向量正交投影算法.改进算法归一化时变遗忘因子使其稳定性优于原算法.此外,在滤波器系数更新过程中,利用系统过去时刻信息,并引进批处理技术,在保持计算复杂度不变的同时提高了算法的抗噪性.仿真表明改进算法改善了声回波对消效果,且稳健性好.Based on the Orthogonal Projection of Gradient Vectors method, an improvea atgux proposed in this paper. On one hand, it normalizes the time-variant forgetting factors so that better stability is achieved when compared with the conventional one. On the other hand, in the process of updating the filter coefficients, the noise immunity can be enhanced with the same computational complexity by using the past information and block processing technique. Simulations show that the proposed algorithm improves the acoustic echo cancellation and achieves robust performance.

关 键 词：梯度向量正交投影 时变遗忘因子 批处理 声回波对消 

分 类 号：TN912.3[电子电信—通信与信息系统]