@BOOK{NAP14311, author = "Transportation Research Board and National Academies of Sciences, Engineering, and Medicine", title = "Acoustic Beamforming: Mapping Sources of Truck Noise", doi = "10.17226/14311", abstract = "TRB\u2019s National Cooperative Highway Research Program (NCHRP) Report 635: Acoustic Beamforming: Mapping Sources of Truck Noise explores the acoustic beamforming technique in an attempt to pinpoint and measure noise levels from heavy truck traffic. The beamforming technique uses an elliptical array of more than 70 microphones and data acquisition software to measure noise levels from a variety of noise sources on large trucks\u2014including the engine, tires, mufflers, and exhaust pipes.", url = "https://nap.nationalacademies.org/catalog/14311/acoustic-beamforming-mapping-sources-of-truck-noise", year = 2009, publisher = "The National Academies Press", address = "Washington, DC" }