Simulation and Evaluation of Acoustical Environments - Determination of Boundary Conditions by Inverse Modeling of Room Acoustics
After having analyzed the efficiency of geometrical algorithms for room simulation and the required complexity and resolution of input data such as 3D-models and their boundary parameters, a new approach for the measurement of boundary conditions will be developed in this project. Being part of the SEACEN consortium (www.seacen.tu-berlin.de), the goal is to establish reference data for an international comparison of room acoustics auralization software. The most crucial input data is the boundary conditions of room surfaces. Using a newly developed method these are determined by inversion of a room acoustics simulation algorithm. This enables calculating the material properties after running standard room Impulse response measurements. The inverse procedure promises to acquire material data accurate enough so that a later replication of the original sound field of a real room can be achieved using a virtual environment with 3-D sound reproduction. A direct comparison of auralizations using A) simulated and B) measured spatial impulse responses is conducted during the project. The comparative listening tests will include different auralization tools, while ensuring that the comparison directly assesses the core algorithms, due to a scrupulous harmonization of all input and output data and interfaces of the simulators. The inverse method has great potential not only for an improved conditioning of room acoustical simulations, but also for room acoustical analysis in general.