Different types of windows are used to design FIR filter. Here, we have used hanning window to design FIR filter. FIR filter has linear phase and also the observed values of As and Ap from magnitude spectrum are closed to the values entered.
In this experiment we had to find the output of a Linear Phase FIR filter using Window Fucntion. A window function is required to truncate infinite samples of hd(n). The window function was decided on the basis of the values of attenuation in stop band. Thus, we performed the experiment for window Bartlett function.
As=21 for Rectangular
25 for Bartlett
44 for Hanning
53 for Hamming
74 for Blackmann
We learnt that Hanning Window function gives more attenuation in stop band than Bartlett window, hence it is a better window function.
There was discontinuity in the phase spectrum observed too
ReplyDeleteBlackman is the best window function as it has highest value of As.
ReplyDeleteFIR filter is designed by truncating infinite samples of hd(n) using window Fns.
ReplyDelete