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Hvordan beregne desibel ?


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Fra: http://www.silentpcreview.com/goto.php?t=s&id=121&a=1

 

RELATIVE SOUND LEVELS

 

The decibel follows a logarithmic scale, rather than a linear one. This is a complex subject, but for our purpose, it is sufficient to note:

 

* 1 dB is generally the smallest difference that can be perceived by human beings

* A 3 dB difference is clearly audible for just about anyone with normal hearing

* A 10 dB difference is generally perceived as being twice or half as loud.

 

This means, for example, that if one source of noise is measured at point of perception at 85 dB, another source that measures 75 dB sounds half as loud. A 95 dB source sounds twice as loud as the 85 dB source, and four times louder than the 75 dB source.

 

Sounds are additive, but not in a simple linear way.

 

* Two 30 dB noise sources make 33 dB

* Four 30 dB noise sources make 36 dB

* Eight 30 dB noise sources make 39 dB

* Sixteen 30 dB noise sources make 42 dB

 

Each doubling of identical noise sources results in a 3 dB increase in noise.

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