MAPPING STATIONARY SOUND FIELDS USING SCANNING TECHNIQUES: THE FUNDAMENTALS OF 'SCANPAINT'

摘要

Scanning measurement techniques such as "Scan & Paint" have been shown to improve upon the performance of traditional methods in terms of flexibility, measurement time and cost as long as the sound field can be assumed time stationary. The method is based on the acquisition of sound pressure and particle velocity by manually moving a PU probe across a sound field while filming the event with a camera. The sensor position is extracted by applying automatic color tracking to each frame of the recorded video. It is then possible to visualize sound variations across the space in terms of pressure, particle velocity or sound intensity. Several algorithms can be applied for mixing spatial information with the acoustic signals. This paper introduces the two main algorithms developed: the point method and the grid method. For this purpose, not only the theoretical foundations of both methods are explored but also their practical implications as efficient sound visualization techniques.