My Baby Heart Rate Record.er-Heartbeat Listen.er is a free app for iOS devices. Because it is free, there are advertisements within the app. You can pay $1.99 and then the app will be ad-free. The app works by placing the phone in the lower abdomen and you hit the record button ...
The heartbeat signal was generally stronger in the thorax sensor, as it was placed closer to the heart. The abdomen sensor had a stronger lung and diaphragm motion. Figure 1d shows the typical heartbeat and respiration waveforms extracted from the NCS sensors. The sensor prototypes are ...