Hearing loss (inner ear hair cell injury) is irreversible
The Centers for Disease Control and Prevention (CDC) revealed in the weekly report on disease and mortality released on February 7, 2017 that more than a quarter of adults who think they have good hearing actually have hearing loss. This data overturned people's concept of the incidence of hearing loss and attracted people's attention to hearing occupational diseases.
▌ how does hearing occur?
The ear is our auditory organ, including outer ear, middle ear and inner ear. The outer ear and middle ear are the collection and transmission devices of sound waves, and the inner ear receives sound waves and positional stimuli.
The sound we usually hear has two conduction pathways: bone conduction and air conduction.
Bone conduction refers to the process of sound wave passing through the skull into the inner ear.
Air conduction is that sound waves are collected through the auricle and transmitted through the external auditory canal to cause tympanic membrane vibration, transmitted to the auditory ossicles of the middle ear and the cochlea to cause internal and external lymphatic fluctuations of the inner ear to excite the spiral apparatus, and then transmitted to the auditory center of the cerebral cortex through the auditory nerve, so there is hearing.
▌ what are the hazards of working under high-intensity noise?
We all have this experience. When we get off the plane or out of the forging workshop, our ears are always buzzing, and we can't even hear each other's voice clearly. It will recover after a while. This phenomenon is called auditory fatigue, which is a protective response of human auditory organs to the external environment.
If people suffer from strong noise for a long time, their hearing will be weakened, which will lead to organic damage of auditory organs and hearing loss.
Strong noise can cause ear discomfort, such as tinnitus, earache and hearing loss. It is determined that noise exceeding 115 DB will also cause deafness. According to clinical medical statistics, if you live in a noise environment of more than 80 decibels, the deaf can reach 50%.
Noise damage to vision. People exposed to noise for a long time are prone to eye injury such as eye fatigue, eye pain, dazzle and tears.
▌ what areas of work require active noise reduction headphones?
Most adults have undetected hearing loss, or people don't realize they have hearing loss at all. In statistics and research, more than 40 million adults aged 20-69 in China have unilateral or bilateral hearing loss, most of which are acquired. According to the data of the Centers for Disease Control and prevention, about half of them (47%) are engaged in work in high noise environment, that is, they induce hearing loss because of noise at work. At this time, we must need a suitable active noise reduction headset.
Space industry:
The noise of the aircraft mainly comes from the engine. First, the air flowing through the engine generates noise by friction with the components in the engine; second, the vibration of the internal parts of the engine generates noise; third, the high-temperature and high-speed gas emitted by the engine mixes with the atmosphere to generate noise.
The noise is so loud that ordinary headphones can't make sound insulation at all, so the appearance of noise reduction headphones plays a vital role in hearing protection for pilots and effectively reduces the impact of noise.
Special industries:
For example, people engaged in welding, logistics, drilling platform or construction workers, lathe workers and other types of work generally have slightly worse hearing health than other occupations.
Electric drill sound, knocking sound, large machine sound... This kind of high-frequency noise has the greatest impact on people's hearing and health. Without noise reduction headphones, I'm afraid the hearing damage will be extremely serious.
Military:
Active noise reduction headphones can not only protect hearing in military, but also improve the efficiency of command system.
It can also restore the environmental sound pickup and gain (amplify and compensate the small signal sound), so it can play a certain role in listening, such as the footsteps of the enemy approaching quietly, which plays an auxiliary role in indoor warfare or infiltration investigation forces.
Active noise reduction headset is a bridge for mutual communication and coordination between troops and superior and subordinate levels. It is an essential key role in modern war.
Therefore, special equipment is necessary in special environment. A good pair of noise reduction headphones is essential, which not only protects your hearing, but also gives you a healthy quality of life.
Active noise reduction headphones can counteract the environmental noise, reduce the noise intensity at work, counteract the damage of noise to eardrum and eardrum, and protect hearing.
Please note that do not use cotton, earplug cotton, sponge, silica gel, sound insulation earplugs and other earplugs with physical noise reduction, because they can not prevent sound wave impact from damaging the ear and have no protective effect on the ear.
