Analysis of a moving sound source - compensation of the Doppler effect

To control the noise from a specific noise source, we need to study its spectrum under operation of noise source. To analyze the noise radiated by a moving noise source, it is difficult to observe the original spectrum of noise because of the Doppler effect. In this paper, we propose the analyzing method of the spectral information which reduces the frequency shift of observed signal. The compensation of the Doppler effect is realized by compensating the propagation delay between noise source and each observer, which is equivalent to the orbit information when the sound velocity Is known. To evaluate the performance of this method, a simple model experiment was carried out. Also the errors in the reduction of the Doppler effect and requirement of this method are considered.