摘要：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
其他摘要：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
