用等效车的方法将K Takagi等人提出的单车道单车种负指数的分布的车流噪声计算公式加以推广，使之可应用于对多车道多车种自由车流的累计分布噪声级Lx和等效声级LΦp作出预报多次应用的结果证实本计算公式的精度可满足实用要求。

Loudness is one of the most essential parameters for assessing the acoustical quality of an auditorium. But owing to the lack of an authentic criterion, it remains unresolved how to evaluate the loudness in concert halts. In this paper LpF, the mean forte sound pressure level of tutti-sound is suggested as a criterion to describe the loudness in a hall. The prediction procedure of the LpF value distribution in a hall is demonstrated, Comparison between predicted and measured LpF levels is given. Tentative optimum and allowable LpF values for concert halls are also doscissed.

This poper descrihes a method for linking the AUTOCAD Drafing Package ('AUTOCAD'). a well-known computer-aided design sofrware package for arehiteets, with an acoustic ray-tracing program, in detail. Two application ptograms. EXTATTDX and EXTVERTE. have been worked out to retrive useful information for a ray-tracing program from the drawing files of AUTOCAD. The flow chart of the EXTATTDXD program and some application examples are given. This linking not only speeds up the acousties andalysis proeess for a rariety of halls, but also enables us to test the acoustic properties for buildingx at design stage. The retriered information can also be used for other application purposes.