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Assessment of the masking effects of birdsong on the road traffic noise environment

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Academic year: 2019

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Figure

Fig. 2. Time percentage of each sound level range of cars passing over their total time history
Table 1. Frequencies of the sound events of cars passing and birds chirping over 5 minutes
Table 2. Mean values of the psychological evaluations of the four characteristics.   Perceived Loudness Naturalness Annoyance
Fig. 4. Box-and-Whisker Plots of the psychological evaluations of Naturalness of the road traffic noise environments at distances of 1, 4, 9, 19 and 50 m from the road without birdsong and with birdsong at 52.5 dBA, showing the statistical distribution of
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