Abstract
In another report, the author point out and proved that a crowded street road or a opening from diffused room, for example, radiate noise as though they are a gathering of point sources. In this report, the author analized the noise attenuation from fundamental type noise sources that are line type, circular type, infinit line type and infinit line type and infinit belt type. Then for rectangular type, approximate integral method was applied and a nomograph to calculate noise intensity was followed that would be applied to calculation of noise intensity from the spontaneous type sources. And then discussed the corelation between rectangular type to another analystic type noise sources. When the point sources which constitute a noise source has some distance each other, the integral analysis might not to be use and the author in vestgated the limit of application of integral method.
