Combined Wave And Ray Based Room Acoustic Simulations Of Small Rooms
Marc Aretz
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Marc Aretz, Combined Wave And Ray Based Room Acoustic Simulations Of Small Rooms (2012), Logos Verlag, Berlin, ISBN: 9783832596750
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Beschreibung / Abstract
The present thesis establishes a complete framework for the combination of finite element and classical ray based acoustic simulations in small rooms and discusses the inherent challenges and limitations including all aspects of sound generation, sound reflection and sound reception. In this context, the thesis gives detailed guidelines for the best-possible determination of all necessary input data for both simulation domains. The overall potential of the presented combined approach is assessed by conducting extensive objective and subjective comparisons of measurement and simulation results for three types of acoustically relevant small spaces (a scale-model reverberation room, a recording studio and two different car passenger compartments).
Inhaltsverzeichnis
- BEGINN
- 1. Introduction
- 1.1. Short survey on room acoustic simulation history until today
- 1.2. Boundary conditions for room acoustic simulations
- 1.3. Key characteristics of sound fields in rooms
- 1.4. Outline of the present thesis
- 2. Signal processing fundamentals
- 2.1. Fourier transformation
- 2.2. Room transfer path as an LTI system
- 3. Sound fields in rooms - Theoretical foundations
- 3.1. Sound propagation in fluid media
- 3.2. Sound reflection at an extended planar boundary
- 3.3. Room acoustics
- 3.4. Objective and subjective evaluation of room acoustics
- 4. Applied room acoustic simulation methods
- 4.1. Room acoustic FE simulations
- 4.2. Hybrid geometrical acoustics simulations
- 4.3. Combination of FE and GA results
- 5. Boundary conditions
- 5.1. Impedance tube: Transfer function method
- 5.2. In-situ method using a Microflown pu-probe
- 5.3. Two-port network model for layered absorbers
- 5.4. Sound absorption measurement in a reverberation room
- 6. Source and receiver conditions
- 6.1. Sound source characterization
- 6.2. Binaural receiver characterization
- 7. Simulation studies on selected aspects
- 7.1. Using the ISM for low frequency prediction
- 7.2. FE simulations in a scale model environment
- 7.3. Coupling between room sound field and loudspeaker
- 8. Combined FE-GA simulations in a recording studio
- 8.1. Real room
- 8.2. Simulation model
- 8.3. Measurements in the real room
- 8.4. Determination of absorption and impedance data
- 8.5. Determination of scattering data
- 8.6. Source and receiver characterization
- 8.7. Comparison of simulation and measurement results
- 8.8. Preliminary subjective assessment of results
- 8.9. Discussion and summary
- 9. Combined FE-GA simulations in a car compartment
- 9.1. Simulation models
- 9.2. Boundary conditions
- 9.3. Source conditions
- 9.4. Comparison of simulation and measurement results
- 9.5. Preliminary subjective assessment of results
- 9.6. Additional measurements in the car compartments
- 9.7. Summary
- 10.Conclusion
- 10.1. Summary
- 10.2. Outlook
- Acknowledgements
- A. Appendix
- A.1. FE-coupling of loudspeaker model with fluid domain
- A.2. Measurement of the microphone free field correction
- A.3. FE-coupling of passive two-port with fluid domains
- Bibliography