Room Surface Estimation Using Reflection Coefficients Measured In-Situ
Tutkimustuotos: Diplomityö tai pro gradu -työ ›
|Tila||Julkaistu - 5 lokakuuta 2011|
|OKM-julkaisutyyppi||G2 Pro gradu, diplomityö, ylempi amk-opinnäytetyö|
In this thesis the reflection from the surfaces is employed as useful information and methods to use this information are presented. The reflective information can be used in the determination of the reflection coefficient of the surface. The reflection coefficients of four common room materials are obtained from their respective impulse response at oblique incidence. The obtained reflection coefficients are studied for the classification of materials.
The problem of estimating the room surface using the reflection coefficients has been approached in a systematic way, accounting for parasitic reflections and background noise. The room impulse response is obtained using the sine sweep signal transmitted through the speaker attached to one microphone array, and recorded by another microphone array. The recorded signal was used to identify possible surfaces using clustering on the obtained reflection coefficients. The classification so obtained is compared with the ground truth to calculate the performance and practicability.