How to check the freqeuncy response of a boxcar filter?

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Kalasagarreddi Kottakota
回答： Chunru 2023-8-15
Ran in:
Hi, I am performing a lowpass filtering with two different filters. a) window i.e. box car b) butter filter. For butter, I know how to see the frequency response, but how to see the freqeuncy response of boxcar filter?
clear all; clc;
fs =2000;
fc =20/(fs/2);
N = 1/fc;
h = boxcar(N); % 1/N = fc
h = h/sum(h);
%filtered_signal = filtfilt(h, 1, signal));
butter
clc; clear all;
fs = 2000;
filtorder = 6; bw_butter =20;
[bcoeff,acoeff] = butter(filtorder,bw_butter/fs*2);
figure()
freqz(bcoeff,acoeff,[],fs)
xlim([0 200])
%filtered_signal = filtfilt(bcoeff,acoeff, signal));

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回答（1 个）

Chunru
Chunru 2023-8-15
Ran in:
clear all; clc;
fs =2000;
fc =20/(fs/2);
N = 1/fc;
h = boxcar(N); % 1/N = fc
h = h/sum(h);
bcoeff = h;
acoeff = 1;
freqz(bcoeff,acoeff,[],fs)
%xlim([0 200])

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