C 8 C o m p a r i s o n of M e a s u r e d an d C a l c u l a t e d D i f f e r e n c e s B e t w e e nF r e e - F i e l d Sound P r e s s u r e Levels and Sound P r e s s u r e LevelsM e a s u r e d O v e r a C r u s h e d S t o n e Surface at the P & W A TestF a c i l i t y
标准号：AIR1672
标准名称： Practical Methods to Obtain Free-Field Sound Pressure Levels
from Acoustical Measurements Over Ground Surfaces
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