Tool/software: Code Composer Studio
We are a university based in Geneva (Switzerland) and we are interested in the TIDM-BPM device. We have downloaded the Altium scheme and we noticed something. Usually to determine the blood pressure we need the AC part of the pressure sensor signal. In fact the output signal of the pressure sensor is composed of a DC part which corresponds simply to the pressure in the cuff and an AC part which corresponds to the pressure generated by the blood on the walls of the artery. Thus usually in order to get the DC part of the pressure sensor signal we make a low pass filter and to get the oscillations (AC part) we make a high pass or band pass filter. However in the scheme provided (please find the document attached) there is only a low pass filter. So our question is why there is not a high pass or band pass filter to extract the AC part of the pressure sensor signal (which is the part of the signal that will help us tp get the blood pressure value) and then how you extract it if indeed you don't use a high pass or band pass filter to get it. I hope that it's clear.
The second question still concerns the same Altium scheme attached. We didn't really understand why you used two pressure sensors : BP300 and MP3V5050.
Thank you very much.
Mike Jaber, Geneva,Switzerland