4  Acoustic Noise and its Measurement

Definitions

Noise level meters, unless very cheap, have primarily two settings, giving readings in dBA and LIN (or dBC).

dBA or dB(A) – either seems currently acceptable in the UK. This is a measurement which gives a reasonable approximation to loudness as perceived by the average person. The ‘A’ weighting network gives the measuring instrument a response which allows for the ear’s lack of sensitivity to low frequencies. See Figure 10.

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Figure 10  A, C and LIN frequency weightings

dB(C). Some noise level meters, particularly in the USA, have a setting marked ‘C’. (Older meters may have a ‘B’ setting. This ...

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