The way in which we can determine the sound energy decay curve once the objective parameters of reverberation have been selected is addressed. The selected objective parameters are reverberation time RT, early decay time EDT, initial-time-delay gap t(I), objective clarity C-80, and strength of arriving energy G. These are known to represent the subjective perception of a room or concert hall well. The curve can be used in analyzing room characteristics as well as in designing an artificial reverberator. In addition, a normalized room impulse response function is proposed. The way to obtain this function from measured data is also described. This can be used to put reverberation on "dry sound."