Time-Varying Filter Representation of Acoustic Transmission Through Panels Under Moving Source Excitation
Résumé
This paper provides a filter design approach for efficient time-domain synthesis of transmitted sounds from moving sources through infinite panels. The moving source problem can be found in vehicle pass-by noise which is a major source of broadband noise in urban environment (indoor and outdoor). The audio rendering of the filtering effect from insulating panels on exterior noise can benefit from psychoacoustic metrics, otherwise unavailable. The present work is structured as follows. First, a minimum phase filter is designed to represent measured or simulated sound transmission through a panel. Then, a moving source signal is synthesized from static multi- microphone array measurements of vehicle in operational conditions in an indoor semi-anechoic room. The resulting receiver signal is obtained from a time-varying transfer path approach. Psychoacoustic evaluation can be performed in order to assess the insulation effect from a perceptual perspective, with a focus on early design stages. The methodology is applied to two different vehicles with different panels? materials, and comparative results are discussed.
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