Speech Transmission Index (STI) is a measure of speech transmission quality. The absolute measurement of speech intelligibility is a complex science. The STI measures some physical characteristics of a transmission channel (a room, electro-acoustic equipment, telephone line, etc.), and expresses the ability of the channel to carry across the characteristics of a speech signal. STI is a well-established objective measurement predictor of how the characteristics of the transmission channel affect speech intelligibility.
The influence[1] that a transmission channel has on speech intelligibility is dependent on:
the speech level
frequency response of the channel
non-linear distortions
background noise level
quality of the sound reproduction equipment
echos (reflections with delay > 100ms)
the reverberation time
psychoacoustic effects (masking effects)
^Speech Intelligibility Measurement Methods
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