Abstract by Zachary Jones
Physics and Astronomy
Wind-Induced Microphone Noise Reduction in Outdoor Noise Level Measurements
In community noise measurements, two possible setups involve either an elevated or ground-based approach. This study compares the elevated and ground-based microphone measurements, particularly for low-frequency wind-induced microphone self-noise. Wind speeds were measured at heights of 0.3 m and 1.7 m. One-third octave spectra were recorded simultaneously at the ground and at 1.7 m. The measurements used Larson Davis 831C sound level meters, but the elevated microphone employed a commercial outdoor windscreen, whereas the ground setup utilized a larger windscreen. The measurements, each lasting between 1.5 and 4 hours, were taken at several locations. The results show the ground plate setup is preferable for outdoor noise measurements for two reasons. First, the wind speed is lower near the ground. Second, the larger windscreen yields superior wind noise rejection. These observations are quantified to expand the noise database for a predictive machine-learning soundscape model.