smart code for separating breathing heart signal and non breathing heart signal

Hi, I'm getting heart signal from the piezo sensor and sending through BLE to MATLAB for processing, I want to write a code for this signal to convert piezoelectric sensor data to the ECG data and getting heartbeat and blood pressure from ECG data but before that first, I have to separate nonbreathing signal from breathing signal in piezoelectric sensor signals, that can work for any signal. I don't know how to do it. I will be thankful if someone knows.

[Jan]

This is a very vague question. You neither explain the available inputs nor what is wanted as output. The algorithm or method has not been mentioned also.

Your chance to get answers will grow, if you concentrate on a specific problem. Edit the question and add more details.

[shina mokhtari]

Thank you for your suggestion, I modified my question.

[Christoph F.]

A piezoelectric sensor measures pressure ("pulse"), and ECG measures voltage ("electrical activity"). Any attempt to deduce the voltage from measured pressure relies on a whole bunch of assumptions that can be completely wrong e.g. under certain pathological conditions (like electromechanical dissociation where the heart still shows electrical activity on an ECG, but no mechanical pumping action occurs; or a pulse can be present without electrical activity in cases where the patient is being resuscitated).

And measuring blood pressure is yet another can of worms entirely. The direct and accurate way is inserting a pressure sensor into one of the patients arteries; all other measurement methods are indirect and once again rely on assumptions.