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# How can I calculate respiration rate from a respiration signal based on specific onsets?

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Gil Sharvit on 8 May 2013
Answered: Peter Gamma on 7 Jan 2020
Dear Matlab experts,
I have a respiration data and I wish to find a way to calculate the respiration rate in specific epochs that I can manually specify.
Is there a way to do that? or any known toolbox?
Thank you very much in advance, Gil

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### Answers (3)

Wayne King on 8 May 2013
You should be able to just do that with a frequency-domain analysis by either computing the DFT (via FFT), or using a nonparametric PSD estimator from the Signal Processing Toolbox, periodogram(), or pwelch()

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Peter Gamma on 29 May 2019
Did someone already create a code for calculating respiration rate, which can easily be modified?
Peter Gamma on 29 May 2019
Is it necessary to have a different algorythm for calculating heart rate than for calculating respiratory rate? Is it possible to modify the following algorythm for calculating respiratory rate?:
https://ch.mathworks.com/matlabcentral/answers/261676-how-can-i-calculate-heart-rates
Peter Gamma on 31 May 2019
Here I found another way to calculate the heart rate:
ECG Signal Processing in MATLAB - Detecting R-Peaks: Full
Can this be modified to calculate the respiratory rate?

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nur syahida shahdan on 29 Oct 2019
Hi. anyone know the equation to calculate respiration rate?
I try to use this coding but it seem like for the heart beat.
dataset = xlsread('rrest-syn192_data.xlsx','Sheet1','A1:B30000')
s = dataset(:,1)
%y = dataset(:,2)
data = [s];
N1 = length(s)
t=0:1/500 : N1/500-1/500
plot(t,s)
title('Plot of signal')
xlabel('Time')
ylabel('Sample(s)')
[pks,locs,w,p] = findpeaks(data)
a=size(pks)
peak_count = (a/2)
Duration_s = (N1/500)
Duration_m = (Duration_s/60)
total_rate_per_minute = (peak_count/Duration_m)

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nur syahida shahdan on 29 Oct 2019
So far we need to used Digital filtering and wavelet decomposition method to extract the respiration rate?
Peter Gamma on 17 Nov 2019
I think so. But we can also try out peak detection of the respiraton signal as it was done for ecg signals. As far as I know, nobody did try it out to this date.
Peter Gamma on 17 Nov 2019
You tried to code it. Did it work? The problem could eventually be the flatter peaks of respiration signals.

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Peter Gamma on 7 Jan 2020
Did you look at this? "Detect beginning and end of inhalation in respiration signal":

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