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Measurement of sound
 In order to measure sound levels, a “sound level meter” is used, which transforms the acoustic energy into electrical voltage. If sound sources are doubled, this amounts to increasing the intensity by 3 dB. In contrast, the “sensation” of doubling of the intensity only occurs with an increase of 10 dB. However, acoustics does not content itself with “physically” measuring sounds; indeed as we have seen, sound is both an objective and subjective notion and one must use criteria that take account of these two characteristics.
Criteria chosen for measurement of sounds:
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