how can obtain the period information from wave format heart sound file for calculating BPM?
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I need to calculate period information from wave format sound by MATLAB code. I need it for calculating heart rate in BPM (Beat Per minute).
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Answers (3)
Wayne King
on 5 Jan 2014
Edited: Wayne King
on 5 Jan 2014
You can use spectral analysis and/or look at the autocorrelation.
Read the data into MATLAB using audioread() or wavread()
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Saifuddin Chowdhury
on 5 Jan 2014
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Wayne King
on 5 Jan 2014
Sorry, you said that earlier, my mistake. How big is the file? Can you simply attach it, or read it in MATLAB first and save the data as .mat file and attach that. Also, we need to know the sampling frequency.
Wayne King
on 5 Jan 2014
Based on your data and the sampling rate
The main oscillation in this data is around 90 Hz.
[Pxx,F] = periodogram(y,[],length(y),fs);
plot(F,Pxx)
set(gca,'xlim',[0 200])
[~,idx] = max(Pxx);
F(idx)
You can confirm by using the autocorrelation:
[c,lags] = xcorr(y,y,480,'coeff');
stem(lags(481:end),c(481:end));
[Pxx,F] = periodogram(c,[],length(c),fs);
[~,idx] = max(Pxx);
F(idx)
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