NEW LOOK AT TRAFFIC NOISE USING PROCESSES WITH INDEPENDENT AND STATIONARY INCREMENTS

We investigate a new road noise modelling. It concerns the acoustic power V(t) = (p(t)/p0)2 and its integral X(t) = integral V(t)dt . Because Leq definition 10 log(DELTA-X/DELTA-t) it is convenient to introduce processes with independent and stationnary increments PISI. Their general form is known (Levy, Khintchine), after some properties we develop estimators for DELTA-X law with some special statistics of measured Leq(i). Road noise measures are made in several urban localisations, near by highways and without any reflexions (say when independence between successive increments of integral V(t)dt may reasonnably be postulated) one gets estimators in rather good agreement with PISI models.