الفهرس 
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Abstract
The subject of room simulation attracted the attention for the last few decades. Many acoustic prediction models have been developed. Geometrical acoustics have been used, in which only pure specular reflections occur. Many models have been suggested to take into account diffuse reflection. These methods are limited to calculate the diffuse part of the impulse response to a small length due to the increase in the number of rays. Then artificial reverberator or the ray direction randomisation method is applied. In this thesis, a new method for the acoustic simulation of enclosures is suggested. This method integrated the mirror-image method and the radiant one to allow the simulation of rooms with boundaries of partially specular reflectivity. By means of the acoustical specular radiant method all combination of diffuse and specular reflections could be simulated to a certain extend.
The thesis consists of seven chapters. The first chapter is an introduction to the field of acoustic room simulation and the aim of the thesis is pointed. In chapter 2, the basic concepts for room acoustics are presented. The different methods, that are used to describe the sound field in rooms, are described.
In chapter 3, an overview of the diffuse reflection is presented. It deals not only with its causes, but also with its effect. Moreover, the earlier methods, that have been used to model the diffuse reflection, are discussed. A new method, that fulfils the aim of this thesis, is suggested in chapter 4. The implementation of the model is presented and some limitations of the method are discussed.
In chapter 5, the results are discussed and the method is verified. In chapter 6, the room response is convoluted with dry speech and subjective tests are used to evaluate the method. Finally, chapter 7 deals with the conclusions of the thesis and the future work in the field of room acoustics simulation is suggested.