how to design a moving window? which has to move sample by sample in simulink

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harish bharadwaj
harish bharadwaj 2011-6-1
hi,
i have converted analog signal to digital using ADC, now i have to apply a moving window to this incoming digital signal and the width of the window is 1 cycle i.e 80 samples.... please help me regarding this
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Fangjun Jiang
Fangjun Jiang 2011-6-1
Assume you have 1000 samples of data, you want to apply a rolling window of 80 samples at a time, what type of processing do you want to do? average, filtering? Please specify.
Also, consider Matlab. Depending on your task, sometimes Matlab is more suitable than Simulink for the job.

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回答（2 个）

Fangjun Jiang
Fangjun Jiang 2011-6-2
Here is a quick and easy way to do it in Matlab.
a=0:0.1:100;
WindowWidth=80;
b=sin(a);
c=abs(b);
d=zeros(size(b));
d(1)=sum(c(1:WindowWidth));
for i=2:(numel(a)-WindowWidth+1)
d(i)=d(i-1)-c(i-1)+c(WindowWidth+i-1);
end
figure(1);plot(b);
figure(2);plot(d);
Sean de Wolski
Sean de Wolski 2011-6-2
doc conv
Edit for Fangjun:
isclose = @(x,y)isequal(size(x),size(y))&&all(abs(x-y)<10^-5)
cway = conv(c,ones(1,80),'valid'); %other shapes if wanted (doc conv)
isclose(d(1:end-79),cway) %throw away your end 80 zeros
ans =
1
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Fangjun Jiang
Fangjun Jiang 2011-6-3
Thanks, Sean!
@Harish, consider using the conv() function if you want the sum has a nice ramp up and ramp down.

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