How do I use the QRS Detection code from Simulink in MATLAB?

I am following the Simulink example:

<https://www.mathworks.com/help/dsp/examples/real-time-ecg-qrs-detection.html https://www.mathworks.com/help/dsp/examples/real-time-ecg-qrs-detection.html >

I noticed that there is a MATLAB Fcn Block that has QRS Detection code. Is it possible to use this code in MATLAB, without having to create a Simulink model? If so, how do I achieve that?

Answer 1

[MathWorks Support Team]

This is certainly possible to do and all you need to do is copy-paste the code into a separate M file and use it like any other MATLAB function.

The more involved part will be processing the input argument "u" in a similar fashion to the one used in the example. The Simulink example's heart rate signal is filtered several times like so:

Raw heart rate signal

Buffer to 90 samples

Resample to 200Hz

Bandpass Filter

Differentiator Filter

Absolute Value

Discrete FIR Filter (moving average)

Then input to QRS Detection.

All the above Blocks have equivalent code or DSP System Toolbox functions that can be used in MATLAB scripts. For example. the Bandpass Filter Block has an equivalent function:

https://www.mathworks.com/help/dsp/ref/fdesign.bandpass.html

You can find alternatives in MATLAB code to all these Simulink Blocks and construct the example in MATLAB scripts.