Page  115 ï~~Two New Approaches to the Sit Brad Gar Music Department, Â~ Columbia Un New York, N' brad@woof.coli ABSTRAI The "traditional" models for room-simulation algor greatly simplify acoustic reality. The justification manageable level the complexity involved in simulc algorithms where concerns for efficiency and comp The first algorithm uses fractal techniques to gener sound from a complex surface (such as a canyon f*-a0a"- ta afa

Page  116 ï~~10*ne *r.. -...p\.. * * * * ~ *..\.. "S*.e.....\ \..r. o f. o na- *ol f 0,, -. eo I _.... W *.te of f..^ 0 000 aass,*.** & **.* ** ***.* source Figure I1: Reflections from a natu (with conreIsponding attenuations) and repeat it recursively wit (see figurcf2). Used with no modification of the original patter yield a variety of interesting comb filter-like effects. The pii delay ine generated by the recursion. Rarely does "the outdo pattern is modified during the recursion, a variety of delay effc can be achieved.. The beauty of fractal algorithms that indentations of natural surfaces with a higzh derere of accura

Page  117 ï~~. -1 S. II. S I ~.-a r a I,' I F ig u r e 3: Wa v e f o r m tr a v e lln g th r o u g h ticDfiu te If thenrid fonr the nodes in the dirrrt simulantion model 1