Simulation of Directional Microphones in Digital Waveguide Mesh-Based Models of Room Acoustics

Date

2010-02-01

Author

Hacıhabiboğlu, Hüseyin
Günel Kılıç, Banu

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

168
views

0
downloads

Digital waveguide mesh (DWM) models are time-domain numerical methods providing computationally simple solutions for wave propagation problems. They have been used in various acoustical modeling and audio synthesis applications including synthesis of musical instrument sounds and speech, and modeling of room acoustics. A successful model of room acoustics should be able to account for source and receiver directivity. Methods for the simulation of directional sources in DWM models were previously proposed. This paper presents a method for the simulation of directional microphones in DWM-based models of room acoustics. The method is based on the directional weighting of the microphone response according to the instantaneous direction of incidence at a given point. The direction of incidence is obtained from instantaneous intensity that is calculated from local pressure values in the DWM model. The calculation of instantaneous intensity in DWM meshes and the directional accuracies of different mesh topologies are discussed. An intensity-based formulation for the response of a directional microphone is given. Simulation results for an actual microphone with frequency-dependent, non-ideal directivity function are presented.

Subject Keywords

Acoustic intensity, Digital waveguide mesh (DWM), Finite-difference methods, Microphones, Room acoustics

URI

https://hdl.handle.net/11511/30809

Journal

IEEE TRANSACTIONS ON AUDIO SPEECH AND LANGUAGE PROCESSING

DOI

https://doi.org/10.1109/tasl.2009.2025100

Collections

Graduate School of Informatics, Article

Suggestions

OpenMETU
Core

Time-domain simulation of directive sources in 3-D digital waveguide mesh-based acoustical models Hacıhabiboğlu, Hüseyin; Günel Kılıç, Banu (2008-07-01) Digital waveguide mesh (DWM) models offer a simple, accurate, time-domain, numerical solution of the wave equation. A specific case where such accurate and computationally simple solutions are needed is the acoustical modeling of open or closed volumes. It is possible to model 3-D propagation of waves in enclosures such as rooms using DWM models. Generally, idealized omnidirectional sources are used for obtaining the impulse response in the DWM. However, real-life sound sources are never completely isotropi...
On the accuracy of first-order numerical derivatives in multidimensional digital waveguide mesh topologies Hacıhabiboğlu, Hüseyin; Günel Kılıç, Banu (2008-01-01) Digital waveguide mesh (DWM) models are numerical solvers for the wave equation in N-dimensions. They are used for obtaining the traveling-wave solution in practical acoustical modeling applications. Although unstructured meshes can be used with DWMs, regular mesh topologies are traditionally used due to their implementation simplicity. This letter discusses the accuracy of first-order approximations to numerical derivatives on more general unstructured mesh topologies. The results are applied to structured...
Source directivity simulation in digital waveguide mesh based room acoustics models Hacıhabiboğlu, Hüseyin; Günel Kılıç, Banu (null; 2007-03-15) 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 variab...
Design of a circular microphone array for panoramic audio recording and reproduction : Microphone directivity Hacıhabiboğlu, Hüseyin; Cvetkovic, Zoran (2010-05-22) Design of a circularly symmetric multichannel recording and reproduction system is discussed in this paper. The system consists of an array of directional microphones evenly distributed on a circle and a matching array of loudspeakers. The relation between the microphone directivity and the radius of the circular array is established within the context of time-intensity stereophony. The microphone directivity design is identified as a constrained linear least squares optimisation problem. Results of a subje...
Evaluation of effective elastic properties of honeycomb sandwich structures by optimization involving modal behavior Çınar, Okan; Erdal Erdoğmuş, Merve; Kayran, Altan; Department of Mechanical Engineering (2014) This thesis aims to develop an alternative approach which estimates the effective elastic properties of 2D orthotropic equivalent model of the honeycomb core material. For this purpose, 3D detailed finite element (FE) model of honeycomb structure, with the actual cell geometry and the face sheets, is used as the reference structure. Effective elastic properties of the equivalent 2D orthotropic model, representing the honeycomb core, are determined by means optimization. The objective function of the optimiz...

Citation Formats

H. Hacıhabiboğlu and B. Günel Kılıç, “Simulation of Directional Microphones in Digital Waveguide Mesh-Based Models of Room Acoustics,” IEEE TRANSACTIONS ON AUDIO SPEECH AND LANGUAGE PROCESSING, pp. 213–223, 2010, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/30809.