The application of butterworth digital filter on the Intelligent measurement and control system
Yanhui Shi · Electrical Measurement & Instrumentation · 2007
The digital filter plays an important role in digital signal processing,which uses mathematics operation on the sampled data to reach the goal of frequency domain filtering.This article indicates the algorithm structure of IIR digital filter and the diagram of directⅡtype filter is given.Then the signal processing toolbox of MATLAB is used to design 3-order Butterworth low-pass digital filter,and the entire program of the digital filter that is realized on TMS320LF2407A DSP is showed.The verification,analysis and comparison are carried on the simulation data,and from the wave diagrams it can be concluded that the Butterworth digital filter which this paper designs meets the requirements,has good practicability and assures the accuracy of sampled data.