Classification of noise

Classification of noise

There are many concepts in decibels. What you ask should be the physical quantity that describes the size of the sound. Hearing loss was calculated by pure tone audiometry at 500 , 1000 , and 2000 Hz Hz . Normal people's hearing range is between 0 and 25 decibels ( dB ).

According to the World Health Organization deafness classification criteria:

26 to 40 decibels; mild toad  
　　 41 to 55 decibels: moderately  
　　 56 to 70 decibels: moderate to severe  
　　 71 to 90 decibels: severely 聋

volume analogy:

　 190 decibels Lead to death
　　 140 decibels The highest critical point defined by the EU that causes complete hearing loss
　　 139 decibels The shouts of Schalke fans
　　 130 decibels Rocket launching sound
　　 125 decibels Jet plane taking off sound
　　 120 decibels Temporary deafness occurs when you stay in this environment for more than a minute.
　　 110 decibels Propeller plane takes off sound, rock concert sound
　　 105 decibels Permanent hearing loss
　　 100 decibels Pneumatic drill sound, compressed hammer hammering heavy sound
　　 90 decibels Noisy bar ambient sound, electric saw saw wood sound
　　 85 decibels and below Will not destroy hair cells in the cochlea
　　 80 decibels Noisy office, sound on the highway
　　 75 decibels Human ear comfort limit
　　 70 decibels Street environment sound
　　 50 decibels Normal conversation sound
　　 20 decibels Whispering

According to the hearing of ordinary people:

　　 0 - 2 0 dB Very quiet and almost imperceptible;
　　 2 0 - 4 0 dB is quiet, like a whisper;
　　 4 0 - 60 dB is average. Ordinary indoor conversation;
　　 6 0 - 7 0 decibels are noisy and detrimental to the nerves;
　　 7 0 - 90 dB is very noisy and nerve cells are destroyed.  
　　 9 0 - 1 0 0 dB Increased noise and hearing loss;  
　　 1 0 0 - 1 2 0 Decibels are unbearable, staying for a minute is a temporary delay.
　　 Above 120 decibels: Extremely 聋 or 聋

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