Measurement of transient response of rooms and comparison with geometrical acoustic models
Measurement of transient response of rooms and comparison with geometrical acoustic models
The transient responses of rooms obtained from measurements and geometrical room acoustic models are compared. The conventional image model was modified in order to include interference in modelling the process of sound wave propagation in rooms by accounting for the amplitude and phase changes produced at each reflection. This "phase image model" has the capability to find the simulated pressure impulse response of a modelled room. In order to validate this model, some theoretical analyses and measurements were first carried out on a single reflecting surface. The pressure impulse responses and energy impulse responses were then measured in real rooms and these were compared with those from the phase image model and the conventional models. It is shown that the inclusion of complex reflections in the phase image model greatly increases the accuracy of the predictions.
In this work Gabor pulses are used as source strength signals which enable time-domain comparison between measurements and room acoustic models. Finally, the possibility is investigated of in-situ determination of the absorption coefficients of wall surfaces in a real room by minimizing the errors between the measured energy impulse responses and those simulated from a ray tracking model. The numerical technique developed for this purpose proved to be rigorous and stable. An attempt was also made to use the phase image model to identify the impedance of wall surfaces, but this proved a more difficult task.
University of Southampton
1998
Suh, Jin Sung
(1998)
Measurement of transient response of rooms and comparison with geometrical acoustic models.
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
The transient responses of rooms obtained from measurements and geometrical room acoustic models are compared. The conventional image model was modified in order to include interference in modelling the process of sound wave propagation in rooms by accounting for the amplitude and phase changes produced at each reflection. This "phase image model" has the capability to find the simulated pressure impulse response of a modelled room. In order to validate this model, some theoretical analyses and measurements were first carried out on a single reflecting surface. The pressure impulse responses and energy impulse responses were then measured in real rooms and these were compared with those from the phase image model and the conventional models. It is shown that the inclusion of complex reflections in the phase image model greatly increases the accuracy of the predictions.
In this work Gabor pulses are used as source strength signals which enable time-domain comparison between measurements and room acoustic models. Finally, the possibility is investigated of in-situ determination of the absorption coefficients of wall surfaces in a real room by minimizing the errors between the measured energy impulse responses and those simulated from a ray tracking model. The numerical technique developed for this purpose proved to be rigorous and stable. An attempt was also made to use the phase image model to identify the impedance of wall surfaces, but this proved a more difficult task.
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Published date: 1998
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Local EPrints ID: 463348
URI: http://eprints.soton.ac.uk/id/eprint/463348
PURE UUID: 47c61a2d-979b-4e10-a560-4ee41f06063a
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Date deposited: 04 Jul 2022 20:50
Last modified: 04 Jul 2022 20:50
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Author:
Jin Sung Suh
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