FIR Band Pass 2 Filter.

Cuthbert Nyack

Frequency and impulse response of an FIR 2 BP filter derived from a Fourier Series of the frequency response.
N is the length of the impulse response.
For the lower band:-
fc1/fs is the lower cutoff frequency expressed as a fraction of the sampling frequency. fc2/fs is the upper cutoff frequency expressed as a fraction of the sampling frequency. For the upper band:-
fc3/fs is the lower cutoff frequency expressed as a fraction of the sampling frequency. fc4/fs is the upper cutoff frequency expressed as a fraction of the sampling frequency.
Frequency response is in red.
Impulse response is in green.
Horizontal axis is from 0 to 0.5 of the sampling frequency.

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