说明：  用于语音回波消除的lms算法的改进，使用这种方法后，能够有效的加快回波消除功能，并且效果也不错，已经在dsp程序里实现
(voice echo canceller for the LMS algorithm, the use of such methods, to accelerate the effective echo canceller function, and also worked well, in achieving procedures dsp)