First, the speakers used are different.
The hearing threshold of the bone is variable, in the low frequency range (500HzLeft and right) required to reach70dBAbove, but in2100 HzOnly left and right30dBThe requirements are met, which is different from the hearing threshold of the ear. Therefore, the speaker used in the bone conduction hearing aid is completely different from the speaker used in the air conduction hearing aid. Bone conduction hearing aids need to design bone conduction speakers in accordance with the hearing threshold requirements of the bone.
Second, digital processing techniques are different.
Since the frequency response of the bone is completely different from the frequency response of the ear, it is completely different in digital processing technology. Bone conduction hearing aids need to design channels and configuration parameters based on the frequency response of the bone.
Third, the power of the speakers is different.
The energy of the bone conduction speaker must match the needs of the skull to sense the sound. The maximum output power of the extremely high power gas conduction hearing aid is only30mwabout. This energy value can only be felt by the eardrum, far from meeting the needs of the skull. The maximum output power of the bone conduction hearing aid can be reached500mwThe difference between hitting the tabletop with a hammer and hitting the table with feathers. Tests have shown that the output power is only reached400mwThe above can be called a true bone conduction hearing aid.
Therefore, although the principle of the bone conduction hearing aid and the air conduction hearing aid are the same, the difference between the bone conduction hearing aid and the gas conduction hearing aid is relatively large due to the difference in the requirements for using the ear to listen to and using the bone. When the auditory organ ages, or the auditory organ is diseased, the ability to acquire sound depending on the vibration of the air is reduced, and the advantage of bone conduction is apparent. The bone conduction hearing aid is directly transmitted into the inner ear, which avoids the secondary damage of the tympanic membrane and the ossicular chain caused by the high gain of the air conduction hearing aid, and has a certain protective effect on the hearing.
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