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Sound advice for understanding acoustics

E2S Warning Signals
First published: 01-03-2013
Version
Download799
Size129.65 KB
Create DateOctober 7, 2014
Last UpdatedJune 1, 2015

Sound is defined as any pressure variation that can be heard by the human ear. This means an average range of frequencies from 20Hz to 20kHz.In terms of sound pressure level, audible sounds range from the threshold of hearing at 0 dB to the threshold of pain which can be over 130 dB. The dB (decibel) is the standard measurement unit in acoustics, yet it can be confusing to understand.

This white paper attempts to explain that the main difficulty in relating to a dB scale is visualising that large differences in power are represented by relatively small increases in the dB level. It also differentiates what happens to sound whether it is an open or a closed space.


File
Sound Basics: Measuring Power in dB