In a recent post on its Research blog, Google reveals it has discovered a way to detect a person’s heart rate through ANC (active noise canceling) earbuds.The method is called Audioplethysmography (say that three times fast), or APG for short. The way it works, according to the tech giant, is the ANC earbuds send out a “low-intensity ultrasound probing signal through” the speakers. The signal then bounces around in the ear canal, sending the echo back to be received
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