Design a discrete signal processing system on MATLAB to estimate the respiratory

Question

Design a discrete signal processing system on MATLAB to estimate the respiratory signals from finger Photoplethysmography (PPG) signals for three fixed metronomic frequencies (15, 20 and 25 breaths/min). The code doesn't have to specify where the inout signal is coming from. We just want a MATLAB filter that extracts breathing signals from puls signals.
*A CLEAR ANSWER IS NEEDED, A COMPUTER TYPED ONE. I DON'T WANT BLURY ANSWERS PLEASE. THANK YOU. Design a discrete signal processing system on MATLAB to estimate the respiratory signals from finger Photoplethysmography (PPG) signals for three fixed metronomic frequencies (15, 20 and 25 breaths/min). The code doesn't have to specify where the inout signal is coming from. We just want a MATLAB filter that extracts breathing signals from puls signals.
*A CLEAR ANSWER IS NEEDED, A COMPUTER TYPED ONE. I DON'T WANT BLURY ANSWERS PLEASE. THANK YOU. Design a discrete signal processing system on MATLAB to estimate the respiratory signals from finger Photoplethysmography (PPG) signals for three fixed metronomic frequencies (15, 20 and 25 breaths/min). The code doesn't have to specify where the inout signal is coming from. We just want a MATLAB filter that extracts breathing signals from puls signals.
*A CLEAR ANSWER IS NEEDED, A COMPUTER TYPED ONE. I DON'T WANT BLURY ANSWERS PLEASE. THANK YOU.

Explanation / Answer

clc;
close all;
clear all;

f1 = 15;
w1 = 2*pi/f1;
[b1,a1] = iirnotch(w1,2);
H1 = tf(b1,a1);

f2 = 20;
w2 = 2*pi/f2;
[b2,a2] = iirnotch(w2,2);
H2 = tf(b2,a2);

f3 = 25;
w3 = 2*pi/f3;
[b3,a3] = iirnotch(w3,2);
H3 = tf(b3,a3);

y = conv((H1+H2+H3),x); %x is the input

plot(y);

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