The early-reflection portion of the sound decay process is of particular importance since it is most responsible for subjective impression. Curves showing early-to-late sound energy ratios (ELR) in the early-reflection period can be helpful in analyzing energy-time characteristics within that period. A measurement and analysis process is described which employs energy-time curves (ETC) and corresponding displays of early-to-late sound energy ratio values in the early-reflection period between 20 and 200 ms. Speech-weighted C50 values for quantifying speech intelligibility and frequency-averaged C80 values for quantifying music clarity are among the objective measures provided by the ELR procedure.
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