Akustische Lokalisaton von Schallquellen

Accurate sound source localization depends on a number of factors, namely the positioning of the microphones used relative to each other and the sources, the quantity and quality of microphones used, the ambient noise and reverberation levels and the number of active sources and their spectral content. Following literature existing source localization procedures may be divided into three general categories:

(1) Maximization of the steered response power (SRP), which is derived from a beamformer, that steers the array to various directions and searches for a peak in output power.

(2) High Resolution Spectral Estimation based locators, which are based on the spatiospectral correaltion matrix derived from the sensor signals.

(3) Time Difference of Arrival (TDOA)-based locators, which are based on time delay estimation (TDE) of the speech signals relative to pairs of spatially separated microphones.

The primary goal of this project is to test TDOA based locators on their robustness against multipath propagation and positioning errors of the micrphones in a simulated environment.