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Recreating room measurements

📄️ Round Robin 3 case study

There have been a series of room acoustic simulation round robin tests organized by Physikalisch-Technische Bundesanstalt National Meterology Institute (PTB institute). The first international round robin was conducted in 1994, followed by the second in 1996-1998. The round robin 2 was organized with 16 participants from 9 different countries using 13 different computer programs. That time the object under examination was a concert hall in Jönköping/Sweden named ELMIA-hall. The results of this round robin had been much better than those of Round Robin 1 but the complex design of this hall generated many troubles. In 1999 the PTB decided in agreement with leading room acousticians in the technical committee of the European Acoustical Association to start another round robin 3" with a relatively simple structured room to have a good control over the scene and boundary materials. In this study over 20 simulation tools were used to simulate the studio room of PTB institute [1]. The room was measured and the material properties of all surfaces in the room were obtained in octave bands 125 Hz - 4k Hz. The room itself is a relatively small (volume of 400 $m^2$ ) but complex room with special diffusors. A strong standing wave was present in the room and a large part of the wall area could be covered with curtains. Results were given both with open curtains and closed curtains.