Abstract
The British Standard BS 4142:2014 is a method for rating noise levels by comparing the rating level of the specific noise source with the existing background noise. This approach includes some corrections, but it does not properly consider the difference in frequency contents of both background noise and the examined specific noise. However, taking into account the influence of the spectrum of the intruding noise corrected by a scale that depends on the signal to noise ratio might solve the issue. It appears that the model of S/N influence on speech intelligibility and the influence of environmental background noise on the effect of specified noise source on people may have a common correction scale. If it is true, as measurements show, the human brain uses the same scale of S/N ratio for the perception of both speech and noise effects, as was shown by the author in the ASA meeting in Providence¸ 2014. This paper shows explicitly how the calculation is done in the case of noise compared with the calculation of the effect of S/N ratio on speech intelligibility. It includes a solved case of using of the correction scale.
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