An Improved Psychoacoustic Annoyance Model Based on Tonal Noises

According to 4 acoustical parameters of noise samples (i.e., loudness, sharpness, fluctuation strength and roughness), Zwicker's psychoacoustic annoyance model can be used to estimate the relative degree of noise annoyance. However, this model can not be well applied to compare the annoyance degrees of tonal noises and atonal noises. In order to improve its estimation effect on tonal noises, laboratory subjective evaluation tests were conducted on 3 sample groups respectively via an 11-point numerical scale. The Zwicker's psychoacoustic annoyance model was improved by taking tonality into account, and introducing the evaluation result of the first noise sample group (1000 kV transformer noise samples) to determine the coefficients in the model. The applicability of the improved model was examined by the evaluation results of the other two groups as well as the data in a previous research on annoyance of 220 kV / 500 kV transformer noises. Results show that the improved model can estimate the relative annoyance degrees caused by various types of tonal / atonal noises much more accurately.