Inclusion of Phase Inofrmation into the Image Source Method
Author
Fonseca Montero, Eduardo
Term
4. term
Education
Publication year
2009
Abstract
This thesis examines whether the conventional Image Source Method (ISM) can be improved by incorporating phase information to enable modeling of interference effects. The approach implements complex sound pressure propagation along image-source paths while retaining real surface reflection coefficients, yielding a phase-enabled ISM (PISM). The method is used to compute simulated pressure impulse responses for a modeled, quasi-rectangular room with acoustically hard surfaces, and its performance is assessed in both time and frequency domains by comparing simulations with measurements in the corresponding physical room. Results show that the implemented model provides reasonably accurate predictions of the complex sound field in the medium-frequency range and for the early part of the impulse responses.
Dette speciale undersøger, om den konventionelle billedkildemetode (Image Source Method, ISM) kan forbedres ved at inddrage faseinformation, så interferensfænomener kan modelleres. Tilgangen implementerer kompleks lydtrykspropagation langs billedkildebaner, mens reelle refleksionskoefficienter bevares, hvilket danner en faseaktiveret ISM (PISM). Metoden anvendes til at beregne simulerede impulsresponser for et modelleret quasi-rektangulært rum med akustisk hårde overflader, og dens ydeevne vurderes i både tids- og frekvensdomænet ved at sammenligne simulationer med målinger i det tilsvarende fysiske rum. Resultaterne viser, at modellen giver rimeligt nøjagtige forudsigelser af det komplekse lydfelt i mellemfrevensområdet og for den tidlige del af impulsresponserne.
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