compute number of pulses for ECG signal

hi, how i can compute number of pulses per minute (for ECG signal) in Matlab... plz any one help me :"

Answer 1

[Daniel Shub]

The first step would be to detect the pulses and count them up.

A very simple solution would be to take all the points in the ECG above a threshold, then require that there is some minimum deadtime between heartbeats. You can get the number of pulse with something like:

sum(find(diff(find(x > threshold)) > deadtime))

This will be extremely sensitive to noise and artifacts. If this i homework, you likely want to use a filtering technique that you have covered (maybe a matched filter)

Answer 2

[Paulo Silva]

Find the number of peaks with the Signal Processing Toolbox™ findpeaks function or one similar function from the FEX

[Daniel Shub]

Thank you Paulo, I couldn't remember the name of the findpeaks function.