分類彙整: earbud

Sound propagates through and is reflected and absorbed by the ear canal, producing a unique signature that can be recorded by a microphone and used for smartphone verification (via rupixen/Unsplash)

Fingerprints aren’t the only unique human identifier: The ear canal produces a particular signature based on how sounds echo or are absorbed inside it. But that auditory John Hancock has largely been overlooked—until […]

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