The importance of early reflected sound from sidewall and ceiling reflecting panels in auditoriums and spaces used for musical presentation has been recognized for some time. Experience teaches that the size, shape, and orientation of the panels affect their reflecting characteristics. Results of ongoing studies using scale modeling techniques are presented. The measured reflection transfer function is given for several types of reflecting panels. Transfer functions measured in the shadow zone of a reflecting panel exhibit interference characteristics. The nonuniformity of the transfer functions is shown to be due to out-of-phase waves diffracted from the panel edges.
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