Question

how is sound level computed?

Answer 1

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Answer 2

Explanation:

2. How is sound measured?

2.1 What are the units for measuring sound

2.2 What are the methods for measuring sound

2.1 What are the units for measuring sound

The SCENIHR opinion states:

3.3.3.Units of noise exposure

3.3.3.1. Sound pressure level and dB SPL

One parameter of the acoustic (sound) wave which is generally used to assess sound exposure to humans is the sound pressure level expressed in μPa or Pa. Human ear’ audible sound pressure levels range from 20 μPa (hearing threshold) till 20 Pa (pain threshold), resulting in the scale 1:10,000,000. Since using such a large scale is not practical, a logarithmic scale in decibels (dB) was introduced which is also in agreement with physiological and psychological hearing sensations.

dB of sound pressure level (dB SPL) is defined as: 20 log10 p1/p0 where p1 is actually measured sound pressure level of a given sound, and p0 is a reference value of 20μPa, which corresponds to the lowest hearing threshold of the young, healthy ear. In the logarithmic scale the range of human ear’s audible sounds is from 0 dB SPL (hearing threshold) to 120-140 dB SPL (pain threshold) (see table 1 below).

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