What is the working principle of bone conduction Bluetooth headset?
The medium of sound transmission includes solid, liquid and air. In general, sound waves are transmitted to the inner ear of the human body in the form of air conduction and bone conduction. Air conduction is a well-known sound wave transmitted to the middle ear through the auricle and external auditory canal. Then through the bone chain to the inner ear. Bone conduction is the vibration of sound waves through the skull of the skull, jaw and other heads, and the sound is transmitted to the inner ear. Bone conduction is another important form of hearing that removes airborne transmission. People use this method to create many bone conduction hearing devices.
The traditional earphones mainly transmit sound through the air, while the bone conduction earphones use the humerus of the head to spread the sound, and finally directly transmit the sound to the auditory nerve in the form of sound waves, instead of passing through the air first. Go to the eardrum and reach our auditory nerves.
At present, bone conduction hearing devices mainly include electromagnetic bone conduction earphones and piezoelectric bone conduction earphones. Electromagnetic bone conduction earphones have better working performance, but electromagnetic bone conduction earphones have electromagnetic radiation, which is easy to cause damage to the user's body. The piezoelectric vibrating earphone uses a piezoelectric vibrator as a sounding element, and the human body is less affected by electromagnetic radiation during wearing, and has the advantages of small volume and low power consumption.