Abstract
Digital filter is one of the most important part of the digital signal processing which is widely used for signal processing in many fields of science and technology. This paper gives a simple introduction both on the development status of digital filter and Matlab software; then, the basic concepts of digital filters is described, including the principles and classification of digital filter and the structure of IIR digital filter etc; we concentrated on the design process of IIR digital filter and some methods (such as the same impulse response method and bilinear transformation method). Analog filter is obtained by transforming the technical parameter of digital filter into the technical parameter of analog filter, according to the same impulse response method or bilinear transformation method. We design the corresponding digital filter based on the created analog filter, and perform all this simulation based on Matlab. Finally, we give a simple description about the FDATool interface design simulation of Matlab.
Keywords ：the same impulse response method; bilinear transformation method; IIR digital filter; Matlab;
