现代电子技术
現代電子技術
현대전자기술
MODERN ELECTRONICS TECHNIQUE
2013年
22期
35-38
,共4页
回声消除%自适应滤波算法%量化误差算法%可变步长算法
迴聲消除%自適應濾波算法%量化誤差算法%可變步長算法
회성소제%자괄응려파산법%양화오차산법%가변보장산법
acoustic echo cancellation%adaptive filtering algorithm%quantization error algorithm%variable step-size algo-rithm
为了提高VoIP的通信质量，减少回声干扰，对LMS算法、NLMS算法进行阐述，基于NLMS提出了一种运算量小并且提高收敛性能的改进的自适应滤波算法。通过在Matlab下的仿真研究和对误差曲线的分析，证明了该改进算法的收敛速度快，均方误差小。用改进的算法对语音回声信号进行消除，仿真得到消除回声后的信号效果明显，为IP电话中回声消除的自适应滤波问题提供了一个较好的算法。
為瞭提高VoIP的通信質量，減少迴聲榦擾，對LMS算法、NLMS算法進行闡述，基于NLMS提齣瞭一種運算量小併且提高收斂性能的改進的自適應濾波算法。通過在Matlab下的倣真研究和對誤差麯線的分析，證明瞭該改進算法的收斂速度快，均方誤差小。用改進的算法對語音迴聲信號進行消除，倣真得到消除迴聲後的信號效果明顯，為IP電話中迴聲消除的自適應濾波問題提供瞭一箇較好的算法。
위료제고VoIP적통신질량，감소회성간우，대LMS산법、NLMS산법진행천술，기우NLMS제출료일충운산량소병차제고수렴성능적개진적자괄응려파산법。통과재Matlab하적방진연구화대오차곡선적분석，증명료해개진산법적수렴속도쾌，균방오차소。용개진적산법대어음회성신호진행소제，방진득도소제회성후적신호효과명현，위IP전화중회성소제적자괄응려파문제제공료일개교호적산법。
In order to improve the communication quality of the voice over Internet protocol(VOIP)and reduce echo inter-ference,an improved NLMS algorithm which has a small amount of computation and can improve convergence performance is proposed based on the analysis of LMS algorithm and NLMS algorithm. By the simulation of Matlab and analysis of the error curve,it is proved the improved algorithm has rapid convergence speed and small mean square error. Through eliminating voice echo signal by means of the improved algorithm,the effect of getting rid of the echo signal obtained by simulation is obvious. A better algorithm was provided for adaptive filtering of canceling the echo in IP phone.
