Further investigation of the coherence of traffic noise transmission through an open window into a rectangular room of a high-rise building by considering time delay

Using wave theory, modal analysis, and a traffic noise model in the past, a theoretical method was proposed and experimentally verified for calculating the coherence between sound pressure inside and outside an open window of a rectangular room in a high-rise building. This paper presents further investigation of the coherence by considering the time delay between the sound pressure waves outside the window and those inside the research room. Firstly, the principle of the method is designed, derived, verified, and quantified by an outdoor experiment at a road whose traffic noise propagates at a distance, what is the simplest scenery of road traffic noise emission. Then, the theoretical principle is applied to the room. A defined experiment to verify and quantified the case will be tested in the future.