Calculate high and low length of given square wave?
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MoeIsKing
am 24 Jun. 2018
Kommentiert: MoeIsKing
am 25 Jun. 2018
warning matlab beginner here :-/
I would like to calculate the high and low pulselength from a real signal, if it is over 10 it is high under 10 it is low. Signal consists of 2002x2 numbers, time and voltage from a light bar...
If i import it with matlab i get 2 seperate double variables, voltage and time as "2002x1 double".
Now to segment the high pulse:
highSignals = signal > 10
Now i can count the high numbers (logic 1) and if i knwo the time distance from before i have the length.
Like: NumberofOnes=50 HighTime=dt*NumberofOnes
Can anyone give me a tip which function does that easyier or more structurised?
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Ameer Hamza
am 24 Jun. 2018
If you have Image Processing Toolbox, then one option is to use regionprops() to find the length of all the high areas and then average them to get a better estimate of highTime.
dt = mean(diff(second)); % sampling time
highRegions = regionprops(Volt>10, 'Area');
averageNumberofOnes = mean([highRegions.Area]);
highTime = averageNumberofOnes*dt;
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Image Analyst
am 24 Jun. 2018
Moes, if you want all the lengths of the valid sections individually you can do
allAreas = [highRegions.Area];
allTimes = dt * allAreas;
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