Numerical Modelling of Coupled Rooms: Evaluation of Decay Times via Method Employing Hilbert Transform |
| M. Meissner
Institute of Fundamental Technological Research, Polish Academy of Sciences, A. Pawińskiego 5B, 02-106 Warsaw, Poland |
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| In the paper, a usefulness of the Hilbert transform: in a computer modelling of reverberant behaviour of rooms is demonstrated for the enclosure consisting of two coupled subrooms. In numerical simulations a decay of the sound pressure is computed and the Hilbert transform methodology is used to determine an envelope of this decay. Calculation results have shown that, because of the mode localization, a distribution of absorbing material has a great influence on decay times evaluated from changes in the pressure envelope. For example, when a difference between the sound damping in subrooms is large, the localization effect is responsible for a creation of a nonlinear decay of the sound pressure level characterized by rapid early and slow late sound decays. |
| DOI: 10.12693/APhysPolA.119.1031 PACS numbers: 43.55.Br, 43.55.Ka, 43.20.Ks, 43.60.Ac |