Abstract
A function, by which reverberation decay curves are calculated from an impulse response of certain system, is re-defined using intuitive concept. Class and its formula of generalized reverberation decay function are derived. The re-definition is performed by 1) definition of instantaneous energy spectra by window operation in time-frequency domain, and 2) definition of time domain marginal function of the spectra as a reverberation function.
It is shown that four known functions of reverberation belong to the generalized class. And also it is shown that the Schroeder method with band passed impulse responses is the sum of the reverberation function and complementary function, namely attack curve function.
Transferring the characteristics of instantaneous power spectra to the class of reverberation by proposed re-definition, the characteristics and differences of known reverberation functions are revealed. Possibility of existence of unkown reverberation function is also described.
