Application and Comparison between FIR and IIR Digital Filter Synthesis Using LMS Algorithm Based on Adaptive Modeling
Changming Zhang · Modern Electronic Technique · 2005
In this paper,the FIR and IIR digital filter characteristics are introduced.Then,using LMS algorithm to accomplish the two filters′ synthesis,and the computer emulation using Matlab6.5 is presented to show the differences between them,when the number of tap-weight(viz.order of th filer) is changing.Some important conclusions are discussed.It can be found from the computer emulation that the IIR filter has the better passband and stopband characteristics than FIR filter with the same number of tap-weight.The performance of FIR wave filter can get great improvement as the number of tap-weight is increasing.And with a big enough one,two filters′performance will reach unanimity. It′s worth to propose the calculating amount of LMS algorithm which is used in FIR filter is obviously smaller than IIR filter with the same number of tap-weight,thus it gets convergence faster.