This paper describes an analysis of various factors affecting traffic noise propagation, including the distance from the road, the existence of a direct path of noise propagation, the density and height of buildings, and the procedure for predicting the attenuation of noise levels from roads. The analysis is based on a multiple regression model utilizing the quantification theory of the first kind. This study incorporates a large amount of survey data concerning traffic noise propagation. The survey of the traffic noise propagation around main roads was carried out in several residential areas, mainly in Tokyo. The attenuation of noise levels measured provided 691 usable data samples. Multiple regression analysis demonstrated that the distance from the road makes the most significant contribution to the explanation of the attenuation of the noise level. The second contributor was found to be the existence of a direct path of noise propagation. Building density and the average height of buildings also affected the attenuation of the noise level considerably. Other factors, such as the height of the building behind the receiver microphone and the number of traffic lanes of the noisesource roads, did not contribute as much to the attenuation of the noise level as the factors mentioned above.
This paper describes a laboralory sludy for investigating 重 he contribution of sound quality on annoyance . To measure the annoyance , two kinds of su 切 ective evaluation test were ca 叮 ied out , i, e . , one for annoyance and Ihe othcr for listening interference . Our findings were :( 1) comribulion of high frequency contents of road traffic noise on annoyance was signi 丘 cant , ( 2 ) the contribution of high frequency colltents of road traffic noise duc 吐 o i 重 s modification beyQnd l kHz by increasing and decreasing its level was equivalent to 3dB ( A )even when the levels of the noise wcre fixed tQ 70dB ( A ) , and ( 3 ) multiple regression models f{)r annoyance in terms of LAeq , roughness and sharpness were constructed and the trade off relationships betwecn the sound quality parame 重 ers and LAeq were calculated . The value of t 田 de off of one standard deviation in roughness and sharpness for annoyance were equiva 且 ent to 4 . 3 dB ( A )and O . 9dB ( A ) respectively provided tha 霊one s紅 andard deviation in LAeq in the model was 6 . O dB ( A
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