To give an idea of the practical significance of the STI index, in different situations of reverberation time in the same environment, two messages have been simulated with the same content but with different intelligibility indexes.

To appreciate even more the differences, it is advisable to listen to the files on headphones, in order to avoid the reverberation of the environment in which you are located.

Input signal, recorded in anechoic environment


STI = about 0,39 low intelligibility


STI = about 0,68 good intelligiblity