HIGH-SPEED SOUND SOURCES LOCALIZATION USING BILINEAR TIME-FREQUENCY TRANSFORMATION

This paper proposes a new method to locate high speed moving sound sou rces based on a bilinear time-frequency transformation, A microphone a rray, used as a directional sensor, is optimised in order to focus on the linear part of the frequency modulation due to the Doppler effect. Simulations are carried out to quantify the accuracy of the localizat ions, A comparison is made with the currently used dedopplerization me thod. Finally, both methods have been tested on acoustic sources of a high speed train (TGV) in normal operating conditions. (C) 1997 Elsevi er Science Ltd.