Design and verification of FIR filter based on Matlab and DSP

The FIR filter is widely used in digital communication and control systems. This paper presents an analysis in detail of the principle of the FIR filter, and selects the proper window function to cut off impulse response, then presents the designing process with the aided tool in fdatool for obtaining the unit impulse response sequence. It also analyzes the FIR realization on DSP and gives the key program. The FIR filter conducts in AD interrupt service program after the converting of AD sample. Finally, it proposes a simple and rigorous validation scheme for this design with Fourier decomposition. The result shows that the FIR filter is accurate, stable, and enjoys a strong practicability and reliability.