Archives of Acoustics, 31, 4(S), pp. 431-438, 2006

The Polish sentence test for speech intelligibility evaluations

E. Ozimek
Adam Mickiewicz University, Institute of Acoustics, Department of Room Acoustics and Psychoacoustics, Umultowska 85, 60-614 Poznań
Poland

D. Kutzner
Adam Mickiewicz University, Institute of Acoustics, Department of Room Acoustics and Psychoacoustics, Umultowska 85, 60-614 Poznań
Poland

A. Sęk
Adam Mickiewicz University, Institute of Acoustics, Department of Room Acoustics and Psychoacoustics, Umultowska 85, 60-614 Poznań
Poland

A. Wicher
Adam Mickiewicz University, Institute of Acoustics, Department of Room Acoustics and Psychoacoustics, Umultowska 85, 60-614 Poznań
Poland

O. Szczepaniak
Adam Mickiewicz University, Institute of Acoustics, Department of Room Acoustics and Psychoacoustics, Umultowska 85, 60-614 Poznań
Poland

The main purpose of this study was to prepare Polish sentence tests for measuring speech
intelligibility against an interfering noise. The tests were developed from meaningful sentences
taken from everyday utterances, TV, literature etc. Two sets of sentence lists were
created. The first set was optimized for the so-called binary scoring and was composed of
25 lists of 20 sentences each, while the second set was prepared for word-based scoring and
was composed of 22 lists of 20 sentences each. The respective lists were statistically and
phonemically balanced, i.e. they produced comparable psychometric functions and revealed
comparable phonemic distribution. The mean SRT (Speech Reception Threshold) and $S_{50}$
(slope of a psychometric function at the SRT point) were: −6.1 dB and 29.5%/dB for the
binary scoring and −7.4 dB and 26.7%/dB for the word-based scoring, respectively. The test
lists comply with the requirements of the high quality test for measuring speech intelligibility
of the Polish language.
Keywords: speech intelligibility, sentence tests, psychometric functions, masking.
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