Direct utilisation of impulse response data in reduction index assessment without intermediate reverberation time estimation (L).

An approach is proposed for reduction index measurement where impulse response data are utilised directly without relying on intermediate reverberation time estimation. The theoretical framework is presented and the main result is substantiated by shown equivalence to the conventional method for ideal exponential decay curves of acoustic energy. Additionally, the study introduces a formula for estimating effective reverberation time in cases of non-exponential decay curves. Further formulas for determining effective values of reverberation time and absorption area for general decay curve shapes are also suggested.