Google researchers use off-the-shelf headphones to measure heart rate

Typical heart rate monitoring in wearable tech, like smart watches or wireless earbuds, relies at least partially on photoplethysmography , which uses light pulses to measure blood activity. It works generally well, but it has its limitations. Google scientists wrote in a new research blog yesterday that they had tried a different approach, called audioplethysmography , that uses ultrasound to measure heart rate.

Google’s researchers also found the ultrasound approach worked fine when music was playing, but said that it had issues in noisy environments and that “the APG signal can sometimes be very noisy and could be heavily disturbed by body motion.” However, they found they could overcome the motion problem by using multiple frequencies and teasing out the most accurate signal among them.

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