猪哥试玩噪音助手-身边噪音大小随时知 app for iPhone and iPad

Noise is the sound that the sounding body makes when it makes random vibrations. Generally speaking, the noise size is measured in decibels. Hearing loss was measured with a pure tone to measure the mean hearing of 500, 1000, and 2000 Hz Hz. Normal peoples hearing range was between 20-20,000 Hz.
World Health Organization deafness classification standard
26 to 40 dB: Mild
41 to 55 dB: Moderate
56 to 70 dB: Moderate to severe
71 to 90 dB: Severe defects
Volume analogy
190 decibels leading to death
140 dB The highest critical point in the European Union that leads to complete hearing loss
139 dB World Cup fans cries
130 dB Rocket Launch Sound
125 dB jets take off sound
120 decibels in this environment will produce temporary deafness for more than one minute
110 dB Propeller airplane take off sound, rock concert sound
105 dB Permanent Damage Auditory
100 dB pressure sound of the drill rig and the sound of the compression hammer hitting heavy objects
90 decibels Noisy bar environment sound, electric sawing saw wood sound
85 dB or less will not damage the hair cells in the cochlea
80 dB Noisy office, sounds on the highway
75dB Human Ear Comfort Limit
70 dB street environment sound
50 dB loud voice
40 dB normal conversation sound
20 dB Whispers
Press ordinary peoples hearing
Cosmic Volume - 254 dB Absolutely Silent
0 -20 dB is very quiet and almost impossible to feel;
20 - 40 db quiet, like whisper;
40 -60 dB normal and regular indoor conversation;
60 - 70 dB Noisy, destructive nerves;
70 -90 dB It is noisy and the nerve cells are damaged.
90 -100 dB Increased noise and hearing loss;
100 - 120 dB Unbearable, stay for a minute or temporary.
120 decibels or more
In order to prevent and control noise pollution and ensure the quality of acoustic environment for the life and work of urban and rural residents, in 2008, the Ministry of Environmental Protection issued the “GB3096-2008 Acoustic Environmental Quality Standard” b]. ][GB12348-2008b]] The environmental noise emission standards “b” and] GB22337-2008 “Standards for Environmental Noise and Environmental Noise”, b) were implemented on October 1, 2008.