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Division 2.1.1 Indicators, frequency range and band definitions

United Kingdom

Original text. Later amendments are not shown.

Noise calculations shall be defined in the frequency range from 63 Hz to 8 kHz. Frequency band results shall be provided at the corresponding frequency interval.

Calculations are performed in octave bands for road traffic, railway traffic and industrial noise, except for the railway noise source sound power, that uses third octave bands. For road traffic, railway traffic and industrial noise, based on these octave band results, the A-weighted long term average sound pressure level for the day, evening and night period, as defined in Annex I and referred to in Art. 5 of Directive 2002/49/EC, is computed by summation over all frequencies:

L Aeq,T = 10 × lg ∑ i = 1 10 L eq,T,i + A i ∕ 10 (2.1.1)

where

  • Ai denotes the A-weighting correction according to IEC 61672-1

  • i = frequency band index

  • and T is the time period corresponding to day, evening or night.

Noise parameters:

Lp Instantaneous sound pressure level

[dB]

(re. 2 10–5 Pa)

LAeq,LT Global long-term sound level LAeq due to all sources and image sources at point R

[dB]

(re. 2 10–5 Pa)

LW ‘In situ’ sound power level of a point source (moving or steady)

[dB]

(re. 10–12 W)

LW,i,dir Directional ‘in situ’ sound power level for the i-th frequency band

[dB]

(re. 10–12 W)

LW′ Average ‘in situ’ sound power level per metre of source line

[dB/m]

(re. 10–12 W)

Other physical parameters:

p r.m.s. of the instantaneous sound pressure[Pa]
p 0 Reference sound pressure = 2 10–5 Pa[Pa]
W 0 Reference sound power = 10–12 W[watt]