Google Explores Ultrasound-Based Heart Rate Monitoring with ANC Earbuds In the world of wearable technology, heart rate monitoring is a ubiquitous feature , often relying on photoplethysmography (PPG) to measure blood activity. While PPG is generally effective, it has its limitations. Google scientists have recently embarked on a pioneering journey to explore a novel approach called audioplethysmography (APG) that leverages ultrasound technology for heart rate measurement. This innovative technique, which boasts versatility and accuracy, involves using off-the-shelf active noise-canceling (ANC) earbuds and a simple software update. The conventional method of heart rate monitoring with wearable technology primarily hinges on photoplethysmography (PPG), which employs light pulses to track blood activity. Although PPG has been the standard for heart rate measurement in devices like smartwatches and wireless earbuds, Google researchers have decided to venture into uncharted ter...