应用于线上会议系统的改进仿射投影符号算法  

Improved Affine Projection Algorithm and Its Application in Teleconferencing System

作　　者：魏丹丹 吴军 周翊[2] WEI Dandan;WU Jun;ZHOU Yi(School of Information Engineering,Zunyi Normal University,Zunyi Guizhou 563002,China;School of Communication and Information Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China)

机构地区：[1]遵义师范学院信息工程学院,贵州遵义563002 [2]重庆邮电大学通信与信息工程学院,重庆400065

出　　处：《西南大学学报（自然科学版）》2023年第10期119-128,共10页Journal of Southwest University(Natural Science Edition)

基　　金：国家自然科学基金项目(62066049);贵州省普通高等学校青年科技人才成长项目(黔教合KY字015号);贵州省科技厅科技支撑计划(黔科合支撑257)。

摘　　要：针对线上会议系统中存在的双端讲话干扰和脉冲噪声问题,提出一种适用于线上会议系统的改进型仿射投影符号算法.该算法首先用无限脉冲响应(Infinite Impulse Response,IIR)滤波平滑的方式计算信号包络来度量信号能量,通过比较相关的能量估计值来有选择地更新滤波器权重系数以降低双讲情况对系统的干扰,然后对噪声建模,并用新的非线性函数类型替代原算法中的sign函数对噪声性能进行提升,防止算法在脉冲噪声影响下发散.仿真结果表明,与传统仿射投影算法相比,该算法可以有效克服线上会议系统中的双端对讲干扰和脉冲噪声干扰,而且在收敛速度、稳态失调等方面依旧保持良好性能.Aiming at the problems of double-talk interference and impulse noise in the application of online conference system,an improved affine projection symbol algorithm for online conference system was proposed.The new algorithm uses the IIR filter smoothing method to calculate the signal envelope as a measure of signal energy,and by comparing the relevant estimates to selectively update the weight coefficients of the filter,so as to reduce the interference to the system.Then the noise was modeled,and the sigmodal function was used to improve the noise performance to prevent the algorithm from diverging.Finally,the convex combination technique was introduced as the algorithm acceleration scheme.The simulation results show that,compared with the traditional affine projection algorithm,the proposed algorithm can effectively overcome the two-terminal talk interference and impulse noise interference,and still maintain good performance in terms of convergence speed and steady-state.

关 键 词：线上会议系统 脉冲噪声 双端讲话 仿射投影算法 

分 类 号：TN911.72[电子电信—通信与信息系统]