I have solved the problem of finding the filter's order. The order, $N$ is 144 (N= 4/Normalized of BW).
Since the $F_s$(sampling frequency) is 7200Hz, $f_p$(pass-band edge frequency) is 500Hz and $f_s$(stop-band edge frequency) is 700Hz.
Now, I want to:
- Create an ideal impulse response i.e, sinc function and then
- Apply a Blackman window function to calculate my filter's coefficients.
I am designing the filter in Matlab and I am having difficulty with those two tasks.