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Recreating room measurements

📄️ Elmia concert hall

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.

📄️ Complex lab facility (Part 1): Full bandwidth wavebased simulation

The study measured the capabilities of Treble’s wave-based solver in a medium-sized room of 80 cubic meters. The solver was tested for full-bandwidth up to 8kHz and both mono and binaural room impulse responses (RIR) were measured using a directive source and a KEMAR mannequin at various positions. The simulations were carried out on a cluster with six Nvidia A100 GPU cards running in parallel. Results are compared and presented for Energy Decay Curves and derived acoustical parameters, reverberation time T20 and early decay time, for the mono RIR. The binaural RIR results are compared both in the frequency domain and in the time domain.