Computer Simulation Of The Frequency Response Of Traffic Noise Measurements As A Function Of Microphone Position

Abstract

Traffic noise measurements are usually performed with the microphone located at a
standardised position. In order to test the influence of microphone position (including its height and
its distance from façade) a computer model has been developed which includes noise reflection at
neighbouring surfaces as well as vehicle trajectory and its associated Doppler spectral warping.
Detailed FFT spectrum as well as octave and one third of an octave spectra have been computed for
different microphone configurations. Results show that influence is not negligible when measuring
noise spectrum, for instance, for spectral noise mapping. Hence, measurement position must be
specified accurately