Abstract
The paper discusses the merits of using a single dB(A) reading in preference to the more complicated and time-consuming process of deriving an NR number. It is shown that, for commonly-encountered spectra, there is a small numerical difference between the dB(A) and NR values. This difference depends upon spectral shape and the overall level of the noise. Octave bands above 1 kHz tend to make the dB(A) level less than the NR number, while the octave bands below 1 kHz generally have the opposite effect.
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