Exploration of OINR testing method by vehicle-mounted loudspeaker

In this paper, we explore the prospects of a modified method for OINR testing according to ASTM E966 that employs a controllable moving point source in the form of a vehicle-mounted loudspeaker. Noise levels are simultaneously recorded inside and outside of rooms within residential buildings while the loudspeaker producing high levels of pink noise is moved past the façade at a distance to produce a variety of incident angles. Sound exposure levels are calculated from a selected time window during post-processing which are then used to determine the OINR. This method provides rapid, consistent results but may introduce some complications. Data sets from several real-world trials are analyzed and presented as well as being compared to the results of calculated outdoor to indoor noise reduction of the subject room. Strengths, weaknesses, limitations, and possible improvements for the method are also discussed.