Archives of Acoustics, 33, 3, pp. 341–350, 2008

Automation of subjective measurements of speech intelligibility in analogue telecommunication channels

Stefan BRACHMAŃSKI
Wrocław University of Technology, Institute of Telecommunications, Teleinformatics and Acoustics

A method of evaluation of speech transmission quality,
called "modified intelligibility test with forced choice" (MIT-FC), is
presented. This method provides a~fully automated measurement of speech
intelligibility (the listener's task is to select on the computer monitor which
of the alternative utterances presented visually to him was spoken). The MIT-FC
method was implemented in a stationary version for measurements of
telecommunication systems and chains and in a portable version for the
measurements of auditoria and mobile communication systems. The results of
application of the MIT-FC method in telecommunications have been presented and
the results obtained have been compared with those of traditional
intelligibility tests.
Keywords: speech quality; speech intelligibility
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