Archives of Acoustics, 32, 4(S), pp. 159-164, 2007

Automation of the logatom intelligibility measurements in rooms

Stefan Brachmański
Wrocław University of Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław

Speech intelligibility is one of basic quality parameters of speech transmission in rooms.
The methods for assessment of speech quality fall into two classes: subjective and objective
methods. This paper includes an overview of selected methods of subjective listening measurements
(ACR – Absolute Category Rating, DCR – Degradation Category Rating, speech
intelligibility) recommended by ITU-T, ISO and Polish Standard and the method of speech
transmission quality evaluation called “modified intelligibility test with forced choice” (MITFC).
The MIT-FC method provides fully automatized measurement of speech intelligibility
in rooms. The experiments carried out in finding the relations between logatom intelligibility
measured with traditional and theMIT-FC methods for the rooms have shown that there exists
the multivalue and repetitive relation between them.
Keywords: speech quality, speech intelligibility, room acoustic.
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