Abstract
Annoyance by noise depends strongly on its informative, spectral contents and individual effect on people. Yet, standards dictate certain formal limitations, ignoring such details. In practice, it happens in many cases of recreational areas, industrial premises and other kinds of activities, that even when results of measurements satisfy the standards limits, complaints do not stop, yielding threats of legal acts. Case studies of the effect, based on actual acoustic measurements are analyzed here, showing factors that cause extreme sensitivity to certain noise patterns, even if the total amount of noise remains unchanged. The effect of color difference is enhanced if the added noise has a certain periodicity, located where the background noise has lower masking effect. Since in many cases the background noise has less effect or resembles white or pink noise, certain noise sources can be clearly heard, if they include higher local amplitudes in the frequency spectra domain of the background noise. Acoustic solutions include means for undesired noise reduction to levels much below the background noise, by as much as by 9 dB, to allow background noise masking of disturbing sources. Such reduction alters its status from being strongly heard to the privacy zone.
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