![]() What’s scary about these false readings (especially the fake heart rate) is it could convince a mom nothing is wrong when there is in fact a problem. Plus, the heart rate was totally wrong for the age of my baby (a baby’s heart rate slows down as pregnancy progresses). The way I knew it was fake is because it played that same heart rate whether I had the phone near my belly or my own heart. One app even played back a heart beat that clearly wasn’t real. There are apps that falsely call themselves a “Fetal Doppler.” Unless you’re buying a doppler device that sends a signal to your phone, this claim is 100% false and deceptive (more on this later).It certainly was not as easy as pressing a microphone to the stomach or chest.įrom there, I tried every baby heart rate monitor app I could find and with no surprise, none of them worked as they claimed. It was not an easy process for a professional audio engineer to capture an adult heart rate with a microphone. I also tried recording my own heart beat which I eventually heard (faintly)… along with a lot of stomach noises. Using professional equipment, all I heard was a lot of stomach noises. ![]() Long story short: None of the microphones picked up a heart beat. I was around 17 weeks pregnant at the time. So, I decided to prove it by testing at a professional sound studio with over $100k of gear ( tech details later) and also testing many apps on an iPhone. ![]() As a professional audio engineer, I didn’t think it was even possible for a microphone to pick up sounds deep inside the body. When I was pregnant, I was surprised to find apps that claimed they could detect a baby’s heart beat.
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