Automação da movimentação de dispositivo de áudio em câmara reverberante em escala reduzida para medição do coeficiente de espalhamento sonoro de incidência aleatório

Abstract

It’s noticed the great time spent for the execution of the random incidence scattering coefficient measurement in reverberant chamber due to the waiting time needed, according to ISO 17497-1:2004, after opening and closing the chamber. This action is required for changes in the audio devices positioning, leading to a time expanse specially great when possessing only one audio source and one audio receiver, even in a reduced scale chamber. Therefore, an automated system for the placement of such devices for different source-receiver positions, without the need of opening the door, was wondered. This project presents a literature review about the coefficient and its measurement technique, a study for the automated system development and its construction. At last, from comparisons with measurements done previously the development of the automated system and interlaboratorial measurements, presented and discussed, it could be stated that the system presented satisfactory results.