通信系统中，扬声器传出的信号，经过空间环境的多重反射叠加后到达传声器，形成声学回声，严重影响通信质量。回声消除是通过自适应滤波器来模拟实际回声路径的冲击响应，从而估计出回声，并从麦克风信号中减去，用到的算法有： 算法， 算法， 算法等。本程序，应用LMS算法，实现回声抵消功能-LMS algorithm is used to achieve echo cancellation function

simulink模拟的二阶sigma delta调制器 可以提高传输速率 中间用到了半带滤波器和FIR滤波器CIC滤波器 进行过采样-Simulink simulation of second order sigma delta modulator can improve the transmission rate use among the half took filter and FIR filter CIC filter sample

IIR数字滤波器的设计，通过一定的变换，将模拟滤波器转换成数字滤波器。-IIR digital filter design, an IIR digital filter design, we first write a formula based on indicators of analog filters, and then through some transformation, the conversion formula analog filter into a digital fil

一个MATLAB例程，模拟高斯白噪声通过带通滤波器，生成一个窄带随机过程。(In a MATLAB routine, the Gauss white noise is simulated by a bandpass filter to generate a narrow band random process.)