D型单路回波抵消器的研制  

A D-type Single Channel Echo Canceller

作　　者：酆广增[1] 周月臣[1] 赵怡军 

机构地区：[1]南京邮电学院无线电工程系

出　　处：《南京邮电学院学报》1992年第2期12-18,共7页Journal of Nanjing University of Posts and Telecommunications(Natural Science)

摘　　要：该回波抵消器以TMS320C25 DSP芯片作为核心,采用横向滤波器形式的分块修正LMS算法,具有双向通话时中止参数修正功能.在回波抵消到某一个固定门限时将残余误差置0.最大尾电路延迟时间达32ms.A D-type single channel echo canceller has been developed succesfully and is described in this paper. A TMS320-C25 DSP chip is used in this canceller and the block update LMS algorithm is adopted for the adaptive echo cancellation.The canceller has double-talk detection function. Once the double-talk is detected,the update process of the parameters will be ceased temporaly. The tail circuit delay can be 32ms. The specification of this echo cancellation is satisfying the CCITT Rec. G165.

关 键 词：回波抑制器 卫星通信 自适应滤波 

分 类 号：TN927.2[电子电信—通信与信息系统]