Energy Decay
The Energy Decay subnode () adds energy decay to Impulse Response plots. In the Model Builder, add and define a 1D Impulse Response plot; then right-click the plot node and select Energy Decay.
Display
In this section you define the display of the energy decay. From the Band type list, choose Broadband (the default) to use all frequencies in a Receiver dataset, or choose Individual bands. If you choose Individual bands, then choose a frequency from the Band frequency list, or choose All to include all frequencies.
From the Plot list, choose what to plot: Energy decay (the default), Level decay, or Modulation transfer function.
This plot also creates a table with values of some quantities of interest. Under Include in the table, choose which quantities to include (by default, all quantities are included):
Definition (Deutlichkeit)
C50
C80
ts
EDT
T20
T30
T60
SNR
STI
The speech transmission index (STI) gives a measure of the reduction in modulation of speech signals. The metric is based on evaluating the modulation transfer function (MTF) in various frequency bands.