MATLAB Answers

Kobi
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looking for a better way to detect peaks

Asked by Kobi
on 8 Nov 2014
Latest activity Commented on by Star Strider
on 9 Nov 2014
when using find peaks i get all the litlle peaks under 0.3 is there a way to detect only the 5 peaks? (without manually setting the threshold to be 0.3)

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1 Answer

Answer by Star Strider
on 9 Nov 2014
 Accepted Answer

The other best option is likely the 'MinPeakDistance' value. Since you’re likely dealing with highly-filtered QRS complexes, and the rate seems to be regular at about 60 BPM, set 'MinPeakDistance' to about 80% of your sample rate.

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why 80%? how do you make that assumption based on that the rate is about 60BPM?
You can choose any value you want. I was suggesting 80% since you want to detect only the R waves and not the P or T waves. Your sampling frequency is in Hz (cycles/sec), and a heart rate of 60 BPM is about 1/second. So 80% of your sampling frequency would skip the P and T waves, and even allowing for some variability, would pick up most R waves.

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