How to extract the time interval from areas of interest from a signal?
1 Ansicht (letzte 30 Tage)
Ältere Kommentare anzeigen
Alexandra
am 8 Nov. 2015
Kommentiert: Image Analyst
am 10 Nov. 2015
Hello! I have a blood pressure signal that looks like this:
and I want to find the time interval for each descent part ( in my case 4 intervals). But I don't know how since it doesn't have any pattern. If anyone can, please help me. Thank you.
1 Kommentar
Star Strider
am 10 Nov. 2015
It actually has a pattern, but you do not have a time vector in your file. You might be able to recover the time vector if you know what the heart rate was.
Akzeptierte Antwort
Image Analyst
am 8 Nov. 2015
First you have to filter out the outliers. How are you doing that? Perhaps a median filter might work if they're not too close together. Then you can just invert the image and use findpeaks(). I can't do it because you didn't attach the actual data.
5 Kommentare
Image Analyst
am 10 Nov. 2015
Something went wrong with your original picture you attached. Please fix it.
Image Analyst
am 10 Nov. 2015
Try this. Let me know how it goes:
signal = xlsread('presiune.xlsx');
plot(signal, 'b-');
[values, indexes] = findpeaks(-signal, 'MinPeakProminence', 25);
grid on;
hold on;
stem(indexes, 50*ones(1, length(indexes)));
Weitere Antworten (0)
Siehe auch
Kategorien
Mehr zu Multirate Signal Processing finden Sie in Help Center und File Exchange
Produkte
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!