Speech parameters

Any of the speech parameters shown below can be selected.

The various speech transmission indices STI, RASTI, STIrMal, STIrFem, are single number measures based on modulation reduction and signal-to-noise ratio in the room or speech transmission system. The modulation transfer function (MTF) and index (MTI) form the basis of calculation of the indices. In WinMLS these are calculated based on impulse response measurements.

The standard IEC-60268-16 3.ed. [2003, Sound system equipment – Part 16: Objective rating of speech intelligibility by speech transmission index.] describes the measures.