Abstract
In any closed environment considered, it can be seen that the acoustic parameters are inherently not constant over the entire area considered. In a closed environment, it is ideally preferred to maintain the acoustic parameters as constant so that there exists better quality of sound leading to better auditory perception with respect to the audience. Practically, some of the acoustic parameters like reverberation time and clarity do not strictly pertain to the pattern obtained theoretically. In this paper, simulations are carried out using I-SIMPA under different values of Sound Transmission Class (STC), source position, distribution and the chamber dimensions and provides an insight into the behaviour of these acoustic parameters and the appropriate values that have to be infused into the system to build the chamber. The acoustic environment is modelled keeping an actual closed room in mind and testing is done with respect to different values of surface absorption coefficients (practically indicated using Sound Transmission Class) and dimensions to determine ideal conditions.
Highlights
A fraction of these sound waves are reflected off the surfaces in a closed environment while the rest of the sound waves are absorbed by the surface medium
Clarity (C50) pattern is the same for all parameter changes but the value differs with each change of parameter
The values of Clarity depend on the Surface absorption percentages and with that of Source Power
Summary
Sound in a medium propagates in the form of a wave. A fraction of these sound waves are reflected off the surfaces in a closed environment while the rest of the sound waves are absorbed by the surface medium. The intensity of the sound wave initially propagated from the source differs with the position of the audience in the room. Acoustic parameters like Clarity (C50) [1] that are key to the auditory comfort of the audience need to be studied in detail to determine a strategy to maintain conditions of acoustic ideality in a room. Various simulations using ISIMPA, an open source software are performed to determine the conditions of acoustic ideality in the closed environment. These simulations have been performed by varying the surface absorption percentages of the floor, ceiling and walls of the acoustic model, keeping in mind the effect of the external environment.
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