Figure 4

A synthetic example, derived from the case analyzed in Figure 9, which describes the contributions of GCC-PHAT functions to the GCF computation. For the sake of simplicity, hyperbolas have been replaced by lines. The dashed peak (in the GCC-PHAT) and line (in the map) correspond to the effect of a reflection on the wall. Figure (a) shows “simplified” GCC-PHAT functions consisting of few impulses. Figure (b) depicts the corresponding GCF map; lines correspond to peaks in the GCC-PHAT functions. Numbers close to intersections represent the amplitude of the map peaks resulting fromthe combination of GCC-PHAT peaks in Figure (a). Note that GCF has a maximum corresponding to Speaker 1 position, and that other peaks (ghosts), exceeding that in Speaker 2 position, are generated by constructive interference.