D50(%) -  Definition

The early to total index, or definition, is

                                              (3)

Definition is mostly used for speech signals, and the early time is usually taken as 50 ms.

The upper integration limits are taken as the truncation point determined in the decay curve formation, or the end of the impulse response, according to the integration option specified. If compensation for truncated energy is calculated, this is taken into account as well to increase accuracy.