Abstract
This paper addresses the problem of interactive auralization of enclosures based on a finite superposition of plane waves. For this, room acoustic simulations are performed using the Finite Element (FE) method. From the FE solution, a virtual microphone array is created and an inverse method is implemented to estimate the complex amplitudes of the plane waves. The effects of Tikhonov regularization are also considered in the formulation of the inverse problem, which leads to a more efficient solution in terms of the energy used to reconstruct the acoustic field. Based on this sound field representation, translation and rotation operators are derived enabling the listener to move within the enclosure and listen to the changes in the acoustic field. An implementation of an auralization system based on the proposed methodology is presented. The results suggest that the plane wave expansion is a suitable approach to synthesize sound fields. Its advantage lies in the possibility that it offers to implement several sound reproduction techniques for auralization applications. Furthermore, features such as translation and rotation of the acoustic field make it convenient for interactive acoustic renderings.
Highlights
Auralization is a subject of great interest in different areas because it enables the generation of an audible perception of the acoustic properties of a specific environment [1]
These omnidirectional references do not use the directional information of the plane wave expansion
A framework for the generation of an interactive auralization of an enclosure based on a plane wave expansion has been presented
Summary
Auralization is a subject of great interest in different areas because it enables the generation of an audible perception of the acoustic properties of a specific environment [1]. A significant feature that enhances the auralization technique is the generation of interactive environments in which the listener can move within the enclosure This is achieved by synthesizing the acoustic field in real time according to the properties of the room and the source-receiver paths. A different approach to interactive auralizations based on the numerical solution of the wave equation is to encode spatial information from the predicted acoustic pressure data. A binaural rendering is achieved based on the relation between spherical harmonics, plane waves and HRTFs. An implementation of a Plane Wave Expansion (PWE) is carried out in the current study as an alternative methodology to generate an interactive auralization from predicted acoustic numerical data.
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