Abstract
Filter in the production of modern life and is essential, both in daily life or in the aerospace industry, can be seen everywhere! But we incompletely understood to its use as well as the principle of work that, the present dissertation mainly enables everybody the better understanding filter use as well as its principle of work
First this article initially introduced any is the filter, the analog filter and the digital filter basic filter principle as well as the analog filter and the digital filter design method. Then uses MATLAB to the low pass or high pass, the numeral or and the mold different type wave carries on the simulation filter, lets others more direct-viewing understanding filter. Finally this article introduced with emphasis based on the MAX262 program control filter principle of design, the design mentality, the design process as well as the application, lets everybody more thorough understanding program control filter the essence.
Key words: Filter, program control, MAX262, MATLAB