BEURTEILUNG UND MESSUNG DER WAHRGENOMMENEN AQUIVALENTEN DAUERLAUTHEIT

The evaluation and measurement of the perceived average loudness of noise immissions is described using the example of road traffic noise. The perceived average loudness is significantly higher than the mean value of the perceived instantaneous loudness. This means that the perceived average loudness is strongly influenced by the louder events within the noise immission. The perceived average loudness of road traffic noise correspondS to the percentile loudness N₄ (the loudness exceeded 4% of the time), measured with a loudness meter in accordance with ISO 532 B with statistics analyzer. The average loudness derived from measurements of the energy equivalent level L(eq) in 1/3 oct bands underestimates the perceived average loudness of road traffic noise by more than 50%. For the assessment of noise immission problems it is therefore not possible to measure the L(eq) values first and then to calculate loudness according to the computer program described in DIN 45631. Rather, it is necessary to measure loudness continuously and to apply a statistical analysis to the loudness time function.