Polygonal PBAP (PPBAP)

The Four-Quadrant PBAP of the previous section readily extends to $N$ -sided polygons. Figure 6 shows a progression from $N=4$ (left), to $N=8$ (middle), and $N=16$ (right). Along the top of the figure is the result of using line arrays (as long as available, yielding the best plane-wave slices in the listening plane). Along the bottom is the compromise obtained by truncating each line array to the portion that borders the interior polygonal listening area (Truncated PPBAP).

Figure: (Top) PPBAP using $N$ line arrays to create an $N$ -sided polygon for the interior listening area. (Bottom) Truncated PPBAP.