“…However, with recent developments in computer technology and efficient solvers, the applicable range of wave-based numerical methods is progressing rapidly for both frequency-domain and time-domain room acoustic simulations [2][3][4][5]. For frequency-domain room acoustics simulation, FEM [6][7][8][9] and the boundary element method [10,11] are standard choices because they can model various sound absorbers more easily than time-domain methods can. In contrast, with the capability of obtaining the impulse response with a single computational run, the following time-domain room acoustic simulations have been developed: the finite-difference time-domain method [12][13][14][15][16], the time-domain FEM [3,[17][18][19], the finite-volume time-domain method [20,21], the pseudospectral time-domain method [22,23], the discontinuous Galerkin FEM [24][25][26][27], and the adaptive rectangular decomposition method [28,29].…”