In industries that use small cooling fans, fan noise simply interferes with the ability of the people working nearby to concentrate on their work. The second is the psycho acoustical characteristic which attempts to judge the effect of noise on human beings.
The first is the physical phenomenon which can be measured and thus used in technical specification. Noise does, however, have two basic characteristics. Perhaps the best definition of it is as an unwanted sound. Noise is, to a great extent, a purely subjective personal phenomena.
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