XP ISO/TS 20065, S31-138 (07/2023)

This document describes a method for objectively determining the audibility of tones in environmental noise. This document is intended to improve the usual method of assessment based on auditory impression, particularly where there is no agreement on the degree of audibility of tones. The described method can be used when the frequency of the evaluated tone is equal to or greater than 50 Hz. In other cases, if the frequency of the tone is less than 50 Hz or if other types of noise (e.g. screeching ) are captured, this method cannot replace subjective evaluation. NOTE The operating mode has not been validated for frequencies below 50 Hz. The method presented here can be used on continuous measuring stations which operate automatically.
(Automatic translation from French)