EXP 6. LINEAR PHASE FIR FILTER DESIGN USING WINDOW FUNCTION

The sixth experiment in the list of DSPP lab manual was Design of the FIR filter. We were told to design the FIR filter by window method on  Scilab. By this date, we had finished FIR filter designing in theory by windowing method and hence we implemented the FIR filter by using the same method. 

There are two methods of design of FIR filter windowing method and frequency sampling method. In this experiment first, we calculate the desired value of impulse function and then it is multiplied by appropriate window function to design the filter. So, we have written a program on Scilab for designing of the FIR filter using windowing method. We plotted the magnitude spectrum and analyzed it. Also, we found out that poles of FIR filter lie always at the origin.
We obtained only the magnitude response in Scilab and not the phase response.

FIR filter is a truncation of IIR filter values .

This truncation results in overshoots in spectrum .This effect is known as Gibbs phenomenon.

Poles in FIR filter lies at origin hence all FIR filter are stable filter