All phones have a fatal flaw: In noisy environments, it can be nearly impossible to hear someone on the other end of the line. As a remedy, some separate Bluetooth headsets use bone conduction to supplement the phone's speaker. Actuators in the earpiece translate audio signals into vibrations, which travel through the jawbone and skull and into the bones in the ear and on to the auditory nerve. Though helpful, those systems produce muffled sound because the vibrations bypass the eardrum, the flap of soft tissue responsible for increasing clarity and producing tone.
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