How the Band provides Baby's heartbeat audio

You spend nine and a half long months waiting to meet your baby. And outside of a few provider appointments, there aren’t many ways to hear your precious little one’s heartbeat while you wait. That’s why we created the Owlet Pregnancy Band — so you have a safe way to connect with your baby at home months before you meet. 

How does the Band work?

The Band is designed to be worn during overnight sleep. It uses 7 electrodes, embedded in the fabric, to passively pick up electrical signals produced by both you and your baby. This includes heartbeat signals, known as an electrocardiogram (ECG). You can click these links to read more about the Band safety and accuracy.

As the Band receives these signals, it processes them to determine the difference between your and your baby’s separate heartbeats and filter out noise from other muscles in your body. The next morning, you’ll receive a session summary with data about your heartbeat and your baby’s heartbeat. You can also listen to a 20-second audio clip of your baby’s heartbeat—the best sound in the world! 

How is the audio clip generated?

To create the 20-second audio clip, the Band’s algorithm first removes the audio from your heartbeat signal since it’s so much stronger and louder than Baby’s. Then, your baby’s heartbeat signal is transformed into an audio signal using a filter that turns the electrical impulses into audible tones. The result is a soft 'thumping' heartbeat sound, similar to what might be heard through a stethoscope. This audio clip is available in the Owlet Pregnancy App and can be shared with family and friends.

The audio clip is generated during a 20-second period during the session when the Band was receiving a high-quality heartbeat signal. Occasionally,  you may not get high enough quality readings for a number of reasons including: 

  • Wearing the Band improperly
  • Noise from other muscle activity
  • A weak heartbeat signal from Baby

When the Band fails to get good readings, an audio clip is not available for playback. For more information, see the article “What causes low quality readings?”

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