L. Gerald Marshall
KMK Associates, 7 Holland Ave., White Plains, NY 10603
Sound energy ratios in one form or another have long been used to quantify and predict clarity. Recognizing the critical importance of early reflections in the sound-decay process to room acoustic character, curves showing early/late ratios in the 20- to 200-ms period may be used as a way of examining the early reflection period, besides providing the established clarity ratings of C[sub 50] and C[sub 80]. An automated measurement program producing octave-spaced energy-time curves and displays of the associated early/late sound energy ratios in the period between 20 and 200 ms will be discussed.