Archives of Acoustics, 31, 4(S), pp. 171-176, 2006

Experimental comparison between speech transmission index (STI) and mean opinion scores (MOS) in rooms

Stefan Brachmanski
Wrocław University of Technology, Institute of Telecommunications, Teleinformatics and Acoustics, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław

Two methods for assessment of speech quality in rooms were compared: the speech transmission
index (STI) and mean opinion scores (MOS). Subjective and objective measurements
were carried out in two rooms for different signal to noise ratio within a range from −15 dBA
to +15 dBA. The obtained results are shown as a curve describing a relation between a MOS,
STI and signal to noise ratio (S/N).
Keywords: speech quality, STI, room acoustic.
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