Speed up FIR filter

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Peter on 17 Oct 2017
Answered: Christoph F. on 18 Oct 2017
Hi, I have to filter large amount of data with a FIR filter. My code works, but is rather slow. Is there a trick to speed it up (apart from FilterM)?
if true
Fn = SamplingRate/2; % Nyquist Frequency
HP=100; % High pass
LP=1000; % Low pass
Wp = [round(HP-0.1*HP) HP LP round(LP+0.1*LP)];
mags = [0 1 0];
devs = [0.05 0.01 0.05];
[n,Wn,beta,ftype] = kaiserord(Wp,mags,devs,SamplingRate);
n = n + rem(n,2);
hh = fir1(n,Wn,ftype,kaiser(n+1,beta),'scale');
FilteredSignal=filtfilt(hh,1,UnfilteredSignal); % filter step
Peter on 17 Oct 2017
Thanks for your advice - you are absolutly right. The filtfilt stemmed from a former butterworth filter, where it is eesential...

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Answers (1)

Christoph F.
Christoph F. on 18 Oct 2017
As an answer:
Using filter() instead of filtfilt() to apply the filter will speed up the calculation by an order of magnitude.

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