Technology Researchers have found a way to turn ANC earbuds into Heart Rate Monitors

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https://www.androidcentral.com/accessories/audio/google-study-earbuds-heart-rate-monitor

• Google's research team has developed new technology that converts existing ANC earbuds into heart rate monitors.
• The acoustic sensing system, referred to as APG, works with off-the-shelf noise cancelling hearables with a software upgrade.
• The technology apparently works even while music is playing and will not impact the earbuds' battery life.

Google published a research paper that details a new experimental technology that can turn any existing ANC earbuds into cardiac monitors through a software update without the need for any hardware.

In the research study titled “APG: Audioplethysmography for Cardiac Monitoring in Hearables,” the tech giant describes the technology as “a novel cardiac monitoring modality” that can be used with off-the-shelf hearables. This new approach relies on audioplethysmography — or APG, for short — which uses ultrasound techniques to measure heart rate.