Figure 3

A two-source example scenario with three microphone pairs is illustrated. The source coordinates are and . Two combination operators sum and product are used to produce two separate spatial likelihood functions (SLFs). The SLF contours are presented in panels (d) and (h). Circle and square represent microphone and source locations, respectively. Panels (a) and (e) illustrate the resulting 2D SLF, produced with the sum and product operations, respectively. The marginal distributions of the SLFs are presented in panels (b) and (c) for the sum, and (f) and (g) for the product. The panel (a) distribution has ghosts which are the result of summed observations, see example ghost at . Also, the marginal distributions are not informative. In the panel (e), SLF has sharp peaks which are in the presence of the actual sound sources. The marginal distributions carry source position information, though this is not guaranteed in general.