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Annoyance of Time-Varying Road-Traffic Noise

Kaczmarek T., Preis A.

Archives of Acoustics

2010

Vol. 35, No. 3

383-393

The aim of the study was to investigate how the time structure of a road-traffic affects the noise annoyance judgment. In a psychoacoustic experiment, the listeners judged noise annoyance of four road-traffic noise scenarios with identical numbers of vehicles and LAeq;T value but different time structure of a road traffic. The traffic structure varied from even to highly clustered across different scenarios. The scenarios were created in the laboratory from a large set of a single vehicle passby recordings. The scenarios were additionally filtered with filters corresponding to a typical window transfer function to simulate the situation inside the building. The experimental results showed that there is a significant difference in annoyance judgment for different traffic structures with the same LAeq;T value. The highest annoyance ratings were obtained for even traffic distribution and the most clustered distribution resulted in the lowest annoyance rating. These results correlated well with the averaged loudness, whereas the percentile loudness (N5) and level (L5) predict the opposite results.

The tram bonus

Kaczmarek T., Hafke H., Preis A., Sandrock S., Griefahn B., Gjestland T.

Archives of Acoustics

2006

Vol. 31, No. 4

405-412

The annoyance of three different sound sources was evaluated in a psychoacoustic experiment. An objective analysis of the stimuli used in the experiment has shown that calculated loudness was responsible for equally annoying pairs of different sound sources. Based on the loudness calculations and annoyance ratings, a "tram bonus" of 3 dB was found in comparison to the bus sound source. In addition, it was found that loudness explains the annoyance results when the LpA max is larger than 74.5 dB(A). With sound levels smaller than 74.5 dB(A) sharpness and roughness contribute to annoyance judgments.