Filter data through a bandpass FIR

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Sam Hurrell
Sam Hurrell on 26 Jul 2022
Answered: Star Strider on 26 Jul 2022
I have multiple sets of data, all with the same timesteps, sample size of 4000, and sampling frequency (Fs) of 50MHz but different frequency based values. Each dataset has a different central frequency (Fc) from 2.4 - 0.6MHz, and has a bandpass filter (BP) of BP = [0.9*Fc 1.1*Fc]. I've tried a digital filter of:
df = bandpass(data(:,2),BP,Fs,'ImpulseResponse','fir');
This filter works for the first few datasets of higher frequencies, but stops when halfway through an error message says "Data length must be larger than 4362 samples". How can this be fixed without compromising the results, or is there a better filter to use?

Answers (1)

Star Strider
Star Strider on 26 Jul 2022
That’s a problem with FIR filters, simply because in most instances they tend to be very long vectors.
Use an IIR filter instead:
df = bandpass(data(:,2),BP,Fs,'ImpulseResponse','iir');
This will design and implement a very efficient elliptic filter.


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