主要包括滤波器的相关知识及仿真软件MATLAB的相关知识。如巴特沃斯（Butterworth）滤波器、切比雪夫（Chebyshev）滤波器、椭圆（Ellips）滤波器、贝塞尔（Bessel）滤波器.模拟低通滤波器系统函数确定模拟高通滤波器系统函数的方法-Mainly includes filter related knowledge and simulation software MATLAB related knowledge. Such as Butterworth (Butterworth) filter, Chebyshev (Chebyshev) filter, elliptical (Ellips) filter, Bessel (Bessel) filter. Simulation low-pass filter system function determine simulation high-pass filter system function method