Average Moving filter in Simulink
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Hey!
I don't have a DSP System Toolbox / Statistics, and I would like to create an average moving filter, and tune it.
I would appreciate any help, and thank in advance!
1 commentaire
Mathieu NOE
le 11 Oct 2023
hello
you can use a FIR filter of length N with 1/N values for all taps
other window are also doable if you want to weight the input data differently (hanning / hamming / kaiser etc...)
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Jon
le 11 Oct 2023
You could do it like this using just the discrete transfer function block included with Simulink>Discrete>Discrete Transfer Fcn, for example for the moving average of last 3 values
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1508379/image.png)
3 commentaires
Jon
le 11 Oct 2023
You could also make the numerator polynomial be [1 1 1 0], and include the current sample in the moving average window, this would give you direct feedthrough which you may or may not want.
Jon
le 12 Oct 2023
You could also do the equivalent of what I show above using the Simulink>Discrete>Discrete FIR Filter, as @Mathieu NOE suggests, using coefficients are in terms of z^(-n), rather than a numerator and denominator using z^(n) as I did.
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Sulaymon Eshkabilov
le 11 Oct 2023
Why not use MATLAB code, e.g.:
t=linspace(0,2*pi);
S = sin(t); % Signal
R=randn(1,100); % Noise
S = S+R*.5; % Signal noise affected
N = 3; % 3-point moving average
S_ma(1)=S(1);
S_ma(2)=sum(S(1:3))/N;
for ii = 3:numel(R)
S_ma(ii)=(S(ii-2)+S(ii-1)+S(ii))/N;
end
plot(t, S)
hold on
plot(t,S_ma, 'r','LineWidth', 2)
% Compare to the MATLAB's moving average filter from finance toolbox
S_mat = movavg(S.', 'simple', N);
plot(t, S_mat, 'k--*')
legend('Signal', 'Code: moving average', 'Matlab"s movavg fcn', 'location', 'best')
grid on
xlabel('t')
ylabel('Signal: S(t)')
1 commentaire
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