Browsing by Author "Nironen, Heli"

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Diffuse Reflections in Room Acoustics Modelling
(2004) Nironen, Heli
Helsinki University of Technology | Master's thesis
This thesis is a study of diffuse reflection modelling in room acoustics. The aim of the work is to get familiar with the most often applied physical principles and modelling methods. An objective is that the studied theory and techniques could be applied in future research work. Room acoustics modelling methods are divided in this thesis into three categories: L Ray-based methods, 2. Radiosity, and 3. Wave-based methods. When considering different modelling methods, emphasis is on the ray-and radiosity-based approaches. Some wave-based methods are also presented, but left out of more accurate examination. Although the approach in this work is mainly physically-based, one totally perceptually-based method is also presented. A simple implementation is carried out in order to get familiar with the studied principles and methods in practice. An early response is predicted with a model which combines the image source method and the radiosity-based approach. The implemented system is described in detail, and the modelling results are analysed. Finally, methods most applicable for estimating acoustical quality of a room, methods most suitable for auralisation purposes, and requirements of real-time dynamic systems are discussed.