A previous study by the author showed that varying the geometric detail level across a normal range for room acoustic computer modeling has little effect on the results of those computer simulations, if major surfaces in the hall are still constructed accurately. Scattering coefficients were kept constant across all detail levels. If one were using lower levels of detail, though, one might assign different material scattering coefficients to compensate for the less mixing geometry. To study the interaction between model detail level and scattering coefficient selection, three performance spaces in Omaha, Nebraska have been modeled in ODEON at varying levels of detail. The lowest level studied represents the spaces simply as six-sided boxes. Each level of detail is tested with five scenarios of scattering coefficients. Of all the objective parameters studied, reverberation time is confirmed to be the most sensitive to scattering coefficient selection, and preliminary results show that it is more so in rooms of lower model detail level. Across the different rooms, however, parameters do not consistently change in an increasing or decreasing manner with varying scattering coefficient; this behavior may depend on the room’s absorption characteristics.
Available at: http://works.bepress.com/lilymwang/31/