Difference between FIR (Finite Implulse Response) and IIR (Infinite Impulse Response) filters?: FIR IIR Linear Phase Response Nonlinear Phase Response Group delay is better Gourp delay is not good More memory Less Memory  Only depends on Input Depends on both input and output Only zeros both zeros and poles (numerator and denumerator) Easy to implement Difficunt to implement Tapping high order Tapping lower order FIR filter:  1) Open Matlab "filterdesigner" --> Get coefficients --> change filter structure to get nominator and denominator for IIR 2) Load FIR and IIR MATLAB Simulink models 3) Replace coefficients IIR Filter:  Simulink result:  Red --> IIR Blue --> FIR DOWNLOAD SIMULINK FILE:http://nhz.us/file.php/1/files/My_FIR_IIR.slx