Glossary
The NORAH glossary provides brief and clear explanations of technical terms and abbreviations. Can’t find the term you were looking for? Then simply get in touch with us via the contact form.
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Decibel
The Decibel – “dB” or “dB(A)” – is a measure of Sound pressure level and thus of Loudness. The decibel scale from 0 to 120 dB(A) reflects the range from the absolute threshold of hearing to the pain threshold. The scale is not linear. We perceive an increase of ten decibels as roughly a doubling of the loudness – in the lower and at the upper ends of the range.