滤波器的设计，信号的抽样，频率变换，信号的幅频，信号的相频等-Filter design, signal sampling, frequency conversion, the signal amplitude and frequency, phase frequency signals, such as

IIR设计及讲解，介绍了双线性变换法，巴特沃斯变换法及滤波器设计的程序和结果。-IIR design and explain, introduced bilinear transform, transform, and Butterworth filter design procedures and results.

傅立叶变换和滤波器设计的ppt介绍傅立叶变换和滤波器设计-Fourier transform and filter design ppt