If you think that "Bluetooth" is the earliest black technology applied to headphones, then you are wrong. There is a black technology that you may not have touched so far, which has been used in the field of audio equipment very early. It is " Bone conduction ". What is bone conduction? As the name implies, it means that the sound is transmitted to the human auditory nerve through the vibration of the bone, which is a way of transmitting sound.
The scientific point is that bone conduction transmits sound waves through the human skull, bone labyrinth, inner ear lymphatic transmission, screw, auditory nerve, and auditory center by mechanically vibrating the sound into different frequencies. The conduction mode, bone conduction eliminates many steps of sound wave transmission, can achieve clear sound reproduction in noisy environment, and sound waves will not affect others because of the spread in the air.
There is such a story. As early as the 18th century, it was said that the great musician Beethoven was an imaginative person. After he was deaf, he tried many ways to restore his hearing. In a piano performance, he tried Using the mouth to bite a baton connected to the piano, the result is a re-feeling of the melody of the music. Although this is an untested story, the principle of bone conduction has been applied since then.
Well, the reason why you have not used bone conduction headphones may be because your hearing is still normal (please look down). For a long time, bone conduction headphones are mainly used in medical, military, scientific research and professional sports, etc. The consumer sector is rare (and the price is more expensive). Out of curiosity, the author recently experienced a "legendary" bone conduction headset, today I want to share with you the use of feelings and personal views. PS: I know yesterday In the evening, everyone stayed up late to watch the Apple conference, the whole network is the news of iPhone6S, then this essay should be a different flavor for everyone.
The earphones we use every day, whether they are head-mounted, in-ear or wireless Bluetooth headsets, mainly transmit sound waves to the ears through air conduction (there will also be a small part of bone conduction). In the process, many outsiders Noise and noise will also be transmitted to the auditory nerve. For example, in the subway, you must cover the noise by turning up the volume of the headphones to listen to the music, although this is not good for hearing.
Bone conduction headphones are different. They do not need air conduction, but pass through the skull to the auditory center. There is almost no noise or noise during transmission, so the sound is much clearer than air conduction, even at a small volume. In addition, there are also great differences in the way of wearing. The bone conduction earphones are generally designed with ear hooks and rear hanging. When wearing, the left and right vibration units are located near the temples, and the ears are completely open.
Someone may ask if you see this: "Is the sound insulation effect of the bone conduction earphones not very bad?" Yes, it does not have any sound insulation effect. When used, the outside sound can be heard normally, so you don't have to worry about walking. When the song is knocked down by the car, this is one of the main uses of bone conduction headphones, safety. Why do deaf people use bone conduction headphones / hearing aids when going out, or safe!
Needless to say about health, because the vibration unit of the earphone directly acts on the skull, it will not cause damage to the tympanic membrane when used, and naturally it will protect the hearing. In fact, after using the bone conduction earphone for a period of time, the most obvious The feeling is comfortable and hygienic. The traditional earmuff headphones will make you feel stuffy when you wear them for a long time. If the size is not suitable, the ear will be very painful. The in-ear headphones are very unsanitary, easy to accumulate deafness and breed bacteria. People who have used headphones for a long time have a little inflammation in their ears.
The bone conduction earphone solves the above-mentioned several obvious problems. It is comfortable and light when worn. Even if it is worn for a long time, it does not have any pressure or discomfort on the ear. Now many bone conduction headphones support Bluetooth and waterproof functions. It is not bound when used. After the headphones are sweaty, it can be washed directly with water. It is very hygienic. So now the bone conduction headphones are suitable for use during exercise, and the user experience is also good.
Said so many advantages, of course, there are some shortcomings and shortcomings. In the process of use, I found that the biggest problem with bone conduction headphones is the sense of hearing. Due to the difference in internal structure and wearing method, the sound of bone conduction headphones is better than that of traditional headphones. A lot smaller, for people like the author who are used to listening to songs at a high volume, they can only open the volume to the maximum. But then the headphones will have a problem of leakage, and people around can hear you listening. What song is really enough to collapse.
Listening to the traditional earphones of large and small size, wearing the bone conduction earphones, I feel the sound quality is strange. First of all, the low frequency is almost not felt, the intermediate frequency and the high frequency are not very obvious, but relative to the weak low frequency, The clarity of the sound is good. In addition, when the vibration module of the earphone is close to the ear, the sound quality will be better, but overall, the bone conduction earphone can't compare with the traditional earphone in the sound quality. If you intend to listen For the purpose of songs to buy bone conduction headphones, I advise you to save this heart.
In addition, there are some unsatisfactory aspects of the bone conduction earphones. For example, when listening to music with strong rhythm, the vibration frequency of the module will become very fast (feel like wearing a massage stick). The ear is itchy. When doing some large movements, or when the head is doing the recline, the headphones will be loose and the sound will change (the volume will be high or low). Of course this may also be used with the author. This headset has a relationship, it is not suitable for use in intense sports. I wonder if the famous "AfterShokz" headphones will have such problems?
Also want to explain, many netizens have questions, if you usually wear glasses, is it not convenient to use bone conduction headphones? I can tell you here responsibly - almost no effect. The two vibration modules of the headphones are convex As long as it is worn, it just crosses the temples. The comfort and firmness are the same as not wearing glasses.
After some experience, the author believes that the reason why bone conduction headphones have not been fully popularized is mainly because its use range is too limited. As a headphone, if it can not bring the sound quality, it may have lost 90%. Market. But in some professional fields (such as: medical, military, fire, sports, etc.), its experience is the best. So, if you have some problems with your hearing, or like to listen to songs while running Or fear of deafness and bacteria on the earplugs, bone conduction headphones may be a good choice for you.
The scientific point is that bone conduction transmits sound waves through the human skull, bone labyrinth, inner ear lymphatic transmission, screw, auditory nerve, and auditory center by mechanically vibrating the sound into different frequencies. The conduction mode, bone conduction eliminates many steps of sound wave transmission, can achieve clear sound reproduction in noisy environment, and sound waves will not affect others because of the spread in the air.
The earphones we use every day, whether they are head-mounted, in-ear or wireless Bluetooth headsets, mainly transmit sound waves to the ears through air conduction (there will also be a small part of bone conduction). In the process, many outsiders Noise and noise will also be transmitted to the auditory nerve. For example, in the subway, you must cover the noise by turning up the volume of the headphones to listen to the music, although this is not good for hearing.
Needless to say about health, because the vibration unit of the earphone directly acts on the skull, it will not cause damage to the tympanic membrane when used, and naturally it will protect the hearing. In fact, after using the bone conduction earphone for a period of time, the most obvious The feeling is comfortable and hygienic. The traditional earmuff headphones will make you feel stuffy when you wear them for a long time. If the size is not suitable, the ear will be very painful. The in-ear headphones are very unsanitary, easy to accumulate deafness and breed bacteria. People who have used headphones for a long time have a little inflammation in their ears.
Said so many advantages, of course, there are some shortcomings and shortcomings. In the process of use, I found that the biggest problem with bone conduction headphones is the sense of hearing. Due to the difference in internal structure and wearing method, the sound of bone conduction headphones is better than that of traditional headphones. A lot smaller, for people like the author who are used to listening to songs at a high volume, they can only open the volume to the maximum. But then the headphones will have a problem of leakage, and people around can hear you listening. What song is really enough to collapse.
Listening to the traditional earphones of large and small size, wearing the bone conduction earphones, I feel the sound quality is strange. First of all, the low frequency is almost not felt, the intermediate frequency and the high frequency are not very obvious, but relative to the weak low frequency, The clarity of the sound is good. In addition, when the vibration module of the earphone is close to the ear, the sound quality will be better, but overall, the bone conduction earphone can't compare with the traditional earphone in the sound quality. If you intend to listen For the purpose of songs to buy bone conduction headphones, I advise you to save this heart.
Also want to explain, many netizens have questions, if you usually wear glasses, is it not convenient to use bone conduction headphones? I can tell you here responsibly - almost no effect. The two vibration modules of the headphones are convex As long as it is worn, it just crosses the temples. The comfort and firmness are the same as not wearing glasses.
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