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Source Directivity Simulation in Digital Waveguide Mesh-Based Room Acoustics Models
Digital waveguide meshes provide a computationally simple physical modelling approach for simulating wave propagation inside enclosures such as rooms. A digital waveguide mesh allows access both to the pressure values at scattering junctions and to the incoming and outgoing wave variables at those junctions. It is thus possible to access both the pressure and the velocity components of the simulated sound field. This paper proposes a simple method to excite a digital waveguide mesh with outgoing wave variables at the scattering junctions to simulate sound propagation from directional sources. Two examples are given for the 2D digital waveguide mesh to demonstrate the utility of the method.
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