If I want to design a 2nd Order FIR filter which blocks out a particular frequency, how would I got about calculating the filter coeffecients?
Say for example, if the sampling frequency was 300 Hz and I wanted to filter out a disturbance at 75 Hz using a filter of the form:
n = a(0)x + a(1)x(n - 1) + a(2)x(n - 2)
How would I calculate the filter coeffecients?
From looking at the other topics on the forum I realise this is probably very simple in comparison, but I'm really struggling!
Generally I don't think, that a precise filter characteristics can be achieved with a 3-tap FIR filter. However, a(0)=a(2)=0.5, a(1)=0 creates a notch filter at 75 Hz, as far as I see.