We are never strangers to noise. The rumbling construction sound on the construction site, the deafening music of square dance, the busy traffic sound, the annoying decoration sound… These are common noises in life.
But there is a kind of noise that often appears in our life, but it will always be forgotten and ignored. It’s low frequency noise.
What is low frequency noise？
Low frequency noise refers to sound with a frequency below 500Hz. Within the range of human ears, 20hz-500hz is low frequency, that is, the irregular sound generated by shaking 20 to 500 times in a second is called low frequency noise.
Comparison of high and low frequency noise
Compared with high-frequency noise, low-frequency noise does not change significantly with distance.
High frequency noise can be rapidly attenuated as the distance is farther or obstacles are encountered. For example, for the point sound source of high frequency noise, the noise will be attenuated by 6dB every time the distance is doubled.
The low-frequency noise decreases very slowly, and the sound wave is also long. It can easily pass through obstacles, rush through walls and walls for a long distance, and reach people’s ears.
In addition, although the low-frequency noise is not as harsh as the emergency brake sound and disco music, both of them will produce sound pressure.
It can be seen that although the direct sense brought by low-frequency noise is not strong, its harm can not be underestimated.
Sound source of low frequency noise
In our daily life and workplace, low-frequency noise is almost everywhere.
Elevators, water pumps, power distribution rooms, transformers, generators, cooling towers, compressor rooms, and even home air conditioners, refrigerators, computers and fish tanks are constantly buzzing as long as they are working.
When the high-frequency noise is greatly reduced in the dead of night, you can clearly perceive the continuous “bombing” of low-frequency noise.
Hazards of low frequency noise
Low frequency noise is a chronic injury to human body, which may not only cause functional damage, but also cause organic damage and mental damage.
1、Low frequency noise affects human internal organs. The frequency of low-frequency vibration and noise is close to that of human viscera, which can cause resonance. Under the long-term influence, it will cause irreversible damage to the heart, lung, spleen, kidney and liver.
2、If it is disturbed by low-frequency sound for a long time, it is very easy to cause neurasthenia, insomnia, headache and other neurosis.
3、Low frequency noise can reach human ear bones directly, which will make people’s sympathetic nerves nervous, heart beat faster, blood glucose and blood pressure rise, and endocrine disorders.
4、Low frequency noise can even affect the fetus in the abdomen of pregnant women, resulting in fetal malformation.
How to keep away from low frequency noise
Low frequency noise exists for a long time and can not be ignored. Therefore, experts suggest that in daily life, we should pay attention to the sources of low-frequency noise and find ways to reduce the harm caused by noise.
On the one hand, household appliances that may have low-frequency noise should be kept away from the bedroom and repaired frequently; On the other hand, earplugs can also be worn for noise reduction.
At the same time, once the low-frequency noise around the living or working place is found for a long time, the relevant departments shall be reminded in time for improvement.
In addition, for people with hearing loss, irritability, headache and insomnia caused by long-term exposure to noise, it is recommended to go to the hospital as soon as possible.
Eastragon is a professional manufacturer of hearing protection. Please contact us if necessary.