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When we eat cookies, the cracking sound we hear is vibration traveling through our facial bones to our inner ears.
We hear bone conduction sound while eating, drinking and scratching our head, etc. Also we hear ourselves talking partially through bone conduction, so that we perceive our own voice differently from what other people hear.
Vibration goes through facial bone (bypass eardrum) to reach cochlea.
Sound wave goes through ear canal and eardrum to reach cochlea.
Ludwig Van Beethoven, the eighteenth-century famous composer, who was almost deaf, found a way to hear music and compose through his jawbone by biting a rod attached to his piano.
This probably was the earliest documentation of bone conduction.
Sgt, Maj. Alex Rowe, a member of the French Foreign Legion, demonstrates the felin system at the Association of the United States Army's Annual Meeting and Exposition.
Bone conduction has a long history in military and hearing aid application. Nothing is more notable than french army’s Felin (Fantassin à Équipement et Liaisons Intégrés) program.
In Felin program, the french military was fielding over 20,000 systems Which included bone conduction headsets over a 7-year span. Bone conduction headsets were chosen because of the fact that it didn’t inhibit ambient Ambient sounds which were critical for soldiers in the field.
For decades, many companies have attempted bone conduction consumer applications. From Sanyo, Toshiba, Damson, Docomo, Temco, Glodendance to Panasonic, the list goes on. The difficulty of developing a musical audio experience in a favorable form factor was proved to be a daunting task. AfterShokz releases a new product and strives to advance bone conduction experience and improve core user experience every year Since the inception of AfterShokz at the end of 2011. Along the way, we invented PremiumPitch+™ technology to expand frequency response spectrum and LeakSlayer™ technology to reduce sound leakage. Aftershokz has been granted over 100 patents worldwide and recognized by many prestigious design institutions.
Sound generated by the transducers is released through the hole to cancel the sound generated by the housing vibration.