Introduction - If you have any usage issues, please Google them yourself
IIR digital filter design commonly used indirect method (impulse response method and the bilinear transform), the most widely used is the bilinear transformation method. Basic design process are: ① the first digital filter given transition indicators into analog filter indicator ② transition analog filter design ③ analog filter system function will transition into a digital filter system function. MATLAB Signal Processing Toolbox in a variety of IIR digital filter design functions are based on the bilinear transform.