Tonality

Tonality or tonality of a noise exists when individual tones can be heard within the noise .

The tonality increases the possible disturbance of a noise in general considerably. This must be taken into account when forming an assessment level by adding a tone quality surcharge that is added to the measurement result. The value of the surcharge is derived from methods that compare the level of the individual tone with the level of a surrounding frequency band (defined differently depending on the method) . Such methods for assessing tone quality are e.g. B. in the regulations ISO 1996-2, TA Lärm and DIN 45681 .

Single tones often occur with periodically working machines ; For example, if a stimulating frequency is the same or approximately the same as the natural frequency of a certain component and this results in increased sound radiation of this individual frequency or a narrow frequency band due to a resonance phenomenon.

literature

• Matthias Vormann: Investigations into psychoacoustic measurement and calculation methods for tonality . Dissertation, University of Oldenburg 2011.