在DSK6711板上用BLMS算法实现无线桌面机声学回音抵消的仿真

Implementing Acoustic Echo Cancellation Simulation of Wireless Desktop-telephone Using BLMS Algorithms on the DSK6711 Board

在很多通信情况下会产生回音,他会严重影响语音的清晰度,一旦回音比较严重时会使得整个系统无法工作,因此需要消除回音。本文要解决的是:当使用无线桌面机通信且按下免提键时,声音会在室内反射然后经过话筒返回而产生回音。现在大部分采用自适应滤波算法来消除回声,多采用L MS算法,由于BL MS算法与L MS算法的效果相同,但BL MS算法的运算量远小于L MS算法,本文采用BL MS算法在DSK6 711板上进行了这种回音抵消的仿真。

Because echo which exist in many communication circumstance can badly influence audio definition, once the serious echo affect normal work of whole system, it is nessary to cancel audio echo.There are some questions should be solved in this paper.When we use desktop telephone (which is developed by our teacher ) to communicae and press handfree key, it can generate echo which is reflected by room and then come back through microphone. Now we prefer to using auto adaptive filter algorithm to cancel echo, for example, LMS algorithm. Because of BLMS algorithm and LMS algorithm have the same effect, but BLMS algorithm′s operation capacity is much less than LMS algorithm′s. This paper emulates acoustic echo cancellation using BLMS algorithms on DSK6711 board.