how can I convert one square wave to impulses ?

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I have the following picture and I want to convert it to impulse for counting how many picks there are. How can I count this picks ? , forexample # 4 for this picture .

Accepted Answer

Mischa Kim
Mischa Kim on 12 Mar 2014
Edited: Mischa Kim on 12 Mar 2014
Onur, you could simply take the derivative of the signal, provided that it is somewhat well behaved. See example below:
t = 0:0.1:20;
x = square(t,5) + 0.1*rand(1,length(t)); % noisy square wave
val = +1; % deriv treshold value
num = length(find(diff(x)>val)); % data points with deriv > threshold
disp(num)
plot(t,x)
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Onur PEKER
Onur PEKER on 12 Mar 2014
Edited: Onur PEKER on 12 Mar 2014
Thank you for your kind answer This is what I searched.

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