Beamforming is an acoustic imaging technique that can estimate the radiation pattern of simple or complex sound sources and produce a map of the results. The pass-by noise test is a standardized test that aims to evaluate the overall...
moreBeamforming is an acoustic imaging technique that can estimate the radiation pattern of simple or complex sound sources and produce a map of the results. The pass-by noise test is a standardized test that aims to evaluate the overall noise of vehicle’s sideline. By coupling the idea of pass-by test with the extension of beamforming technique to moving sources provides the access to the recognition of sound sources produced by vehicle movements, for example, rolling tires, engines and exhaust systems. The present paper aims to describe a low cost system to apply the beamforming technique to pass-by noise test. The system is based on the use of low cost electret microphones mounted in a metallic array which are connected by a coaxial cable to the acquisition system. Later in this document in the application section the results of beamforming maps of pass-by noise test can be viewed in more detail.
