When hearing their own voice from the recorder for the first time, many people feel uncomfortable. They think the voice in the recorder is particularly unpleasant, and even suspect that it is not their own voice. But people around them will nod their heads and say, "Yes, this is you.". Why can't you even recognize your own voice? This is because when we talk, part of the sound is transmitted to the auditory nerve through the bone, which is called bone conduction.
At CES this year, we also saw many earphones that only use bone conduction technology. The advantage of bone conduction earphones is that you don't have to worry about too much volume to damage your eardrum and turn it into a modern Beethoven. Another advantage of bone conduction is that he doesn't have to put it in his ears and is not afraid to cross the road when listening to songs.
Principle of bone conduction
Forget whether we learned in high school or junior high school that sound transmission requires media, which can be not only air, but also metal, water, stone, and of course, our own bones are OK.
Generally, the sound we hear is transmitted from the air to the ear, then transmitted to the brain through the auditory nerve for analysis, and finally heard the sound. The way of bone conduction earphone is different. It transmits sound to the auditory nerve through the vibration of the earphone's cheek, and finally obtains sound through brain analysis. That is to say, even if we don't have ears, we can still hear sounds.
In fact, when we eat, the sound is very small. People around us cannot hear it, but we can hear it very clearly. Even if you put something in your ear, the sound is still very clear. This is also bone conduction.
It is said that when Beethoven's ears failed, he heard the sound by biting a stick connected to the baton. The sound of the piano was transmitted to Beethoven's teeth through the stick, and then the bone was transmitted to Beethoven's auditory nerve. Of course, this method of listening to the voice is quite backward. You can't even speak when you are biting something.
Problems with bone conduction earphones
However, because the density of bone is much higher than that of air, a large amount of energy is consumed in the process of conduction, so the AfterShokz bone conduction earphone displayed on CES needs an additional battery box.
In addition, the biggest problem of bone conduction earphones is that resonance peaks are often found at low frequencies or high frequencies, which will greatly affect the sound quality, which is why many people report that such earphones do not have bass.
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