Project Details
Projekt
Signal Processing for Reproduction of Room Acoustics
Applicant
Professor Dr.-Ing. Sascha Spors
Subject Area
Acoustics
Term
from 2011 to 2018
Project identifier
Deutsche Forschungsgemeinschaft (DFG) - Project number 174776315
The authentic reproduction of captured acoustic scenes is an essential building block forthe evaluation of room acoustics. A number of sound reproduction techniques, that aim at authentic reproduction, have been developed in the past. This project focuses on Wave Field Synthesis and higher-order Ambisonics as loudspeaker-based, and binaural reproduction as headphone-based techniques. For all of these at least the basic concept for authentic reproduction of captured room acoustics has been presented in the literature. However, a number of theoretical and practical issues have not been investigated In detail so far. Furthermore, comprehensive results towards a comparison of the different approaches are rarely available at the current state. This project aims at developing a unified view on authentic reproduction of captured room acoustics. The existing approaches will be formulated in an unified framework, their properties will be evaluated and Improved algorithms will be developed. The considered techniques consist typically of three main building blocks: sound field capture, extrapolafion and synthesis. Spherical microphone arrays provide superior properties for the high-resolution capture of room acoustics. The theory of spherical microphone arrays is well understood and will not be treated extensively in this project. Sound field extrapolation techniques, allow to calculate the sound field within or outside of the region enclosed by the microphones. While the basic theory is well understood, relevant aspects that tie in the scope of this project are still missing. The signal processing required for auralization of captured room acoustics involves the extrapolation of the captured wave field from the microphone to the loudspeaker positions. The practical limits of this procedure in conjunction with auralization has not been investigated in detail so far.
DFG Programme
Research Units
