关键词: 呼叫中心, 回声消除, 最小均方误差算法

Abstract: LMS（Least Mean Square） algorithm has been studied for the echo problem of IP call center. The study shows that there is a contradiction between the convergence rate and steady-state error. In other words, speeding up the convergence rate, the steady-state error will be increased; reducing steady-state error, the convergence rate will be slow. The purpose of study is to improve the contradiction and better eliminate echo. A new LMS algorithm is proposed. The algorithm is simulated by using computer, and echo is eliminated by using DSP. Result is that this algorithm has good convergence and steady-state performance. It can better improve the contradiction between the convergence speed and steady-state error, and the elimination result is good.

Key words: call center, echo cancellation, Least Mean Square（LMS） algorithm