Thank you for all the explanations. I have a littmann core stethoscope, it is actually quite successful, but it stores the recorded sounds on its own server, so I cannot create a dataset for signal processing. Also, my goal is to record ECG simultaneously with heart sounds, there are devices that can do this, but the recording issue is still the same. I wonder if I can design a design that can record the heart sound simultaneously with the ECG in acceptable quality. I have taken care of the ECG issue, Bluetooth connections and the Android application for recording, and I can even record the sound from the audio output of the smartphone. But I have reservations about potential lags and compressed format of the sound.
Paralogic