What is the bone conduction earphones?

Whether it is for animals or humans, listening to sound is very important, and the ear is an important organ for us to perceive sound. So why do we still hear our own voice when we cover our ears? Why do we always feel that our recordings don't sound like our own? Why do we still feel noisy when we chew our food carefully? This is because sound is transmitted to the inner ear mainly through two routes, air conduction and bone conduction. Typically, both propagation paths operate simultaneously. However, most of the sounds we hear are transmitted to our ears by means of air conduction.

1. The classification of Active Noise Cancelling TWS Earphones equipamento

1) Classified by sound frequency, divided into ultrasonic bone conduction and normal bone conduction

The ultrasonic bone conduction hearing aid modulates the sound signal into the ultrasonic range, and then transmits it to the human auditory nerve through bone conduction. It is mainly used for patients with total deafness or deep deafness.

The normal bone conduction hearing device directly converts the received speech signal into a vibration signal, which is the sound transmission principle of most bone conduction devices at present.

2) According to the wearing method, it can be divided into two types: external wearing type and implanted fixed type.

External wearables do not require surgical fixation, such as Active Noise Cancelling TWS Earphones. Implanted fixed bone conduction hearing devices need to be surgically implanted into the human body to restore hearing in patients with sensorineural hearing loss, conductive hearing loss, and mixed hearing loss.

3) According to the principle of sound production, bone conduction hearing aids can be divided into three types: electromagnetic type, piezoelectric type, and giant magnetostrictive type.

2. The application of bone conduction technology

At present, most of the earphones and hearing aids on the market are made of the principle of air vibration, so the application of air conduction will not be repeated in this article. Bone conduction eliminates part of the sound wave transmission steps, and can achieve clear sound restoration in a noisy environment. At the same time, sound waves will not affect others due to diffusion in the air. Taking advantage of this feature, people apply bone conduction technology to different in the field.

The specific applications of bone conduction technology are as follows:

(1) Bone conduction hearing aids

For conductive hearing loss (meaning that the sound channel in the patient's ear is blocked, the external sound cannot be transmitted normally, so that it cannot perceive the sound), we can use the hearing aid to open or re-open a channel, so that the sound can be directly transmitted to the human brain through vibration, Through the auditory nerve, the deaf patient can re-perceive external sounds. Bone conduction hearing aids on the market today are usually divided into two types: external and implantable. The plug-in type does not need to be worn by surgical fixation. Implantable hearing aids can usually be divided into three types: bone-anchored, middle-ear implanted, and external-ear implanted.

(2) Bone conduction microphone

Bone conduction microphones use the slight vibration of the bones of the head and neck caused by people's speech to collect sound signals and convert them into electrical signals. Since the loss rate of sound in bone conduction is much lower than that in air conduction, it can transmit sound with high clarity even in a very noisy environment, which has important application value in many occasions where strong anti-noise capability is required.

(3) Active Noise Cancelling TWS Earphones

Like bone conduction microphones, Active Noise Cancelling TWS Earphones Transmitir som para o ouvido interno através de vibrações no crânio. Por estar em contato direto com o osso, o som pode ser ouvido claramente mesmo quando as orelhas estão bloqueadas e o som do Fones de ouvido com cancelamento de ruído ativo pode ser distinguido em um ambiente muito barulhento.

Com o fortalecimento da conscientização das pessoas sobre saúde esportiva, produtos confortáveis, firmes, impermeáveis ​​e à prova de suor se tornaram as características básicas do consenso da indústria. Nesta base, especialmente para esportes ao ar livre, é necessário não apenas ouvir música, mas também perceber o mundo exterior sem obstáculos. Portanto, Fones de ouvido com cancelamento de ruído ativo que são mais adequados para uso em cenas esportivas também são favorecidas por cada vez mais entusiastas de esportes profissionais.

Comparado com o dispositivo de condução de ar, o dispositivo de condução óssea não precisa ser usado no ouvido, o que pode reduzir o crescimento de bactérias no canal da orelha e proteger o canal da orelha. A unidade de vibração de Fones de ouvido com cancelamento de ruído ativo age diretamente no crânio, evitando danos ao tímpano causado pelo uso a longo prazo do tradicional orelhatelefones. Claro, isso não significa que o Fones de ouvido com cancelamento de ruído ativo Não causará danos auditivos se o volume for aumentado e usado por um longo tempo, mas os danos serão muito menores.