Effect of reverberation on speech intelligibility, logatom test “in situ”

Rafał Polar,

Jolanta Gintowt


The influence of acoustic parameters of lecture halls is essential for the quality of reception and the understanding of the content. One of the basic acoustic parameters is the reverberation time in the room. The study demonstrates that the room which is not properly designed for acoustics, causes difficulty in understanding the delivered text. Selected acoustic parameters were analyzed, such as reverberation time, acoustic background, and delivered text intelligibility. A possible solution was proposed, using reflecting and absorbing surfaces appropriately positioned in the room.

Słowa kluczowe: acoustics, reverberation time, logatom test, quality of teaching

Bukowski B., Dźwięk i budowa – podręcznik akustyki budowlanej, nakł. Instytut Badawczy Budownictwa, Warszawa 1947.

Sadowski J., Akustyka w urbanistyce, architekturze i budownictwie, Arkady, Warszawa 1971.

Sadowski J., Akustyka architektoniczna, PAN, Warszawa–Poznań 1976.

Kowal A., Zagadnienia akustyki budowlanej, Politechnika Krakowska, Kraków 1969.

Barron M., Auditorium Acoustics and Architectural Design, E & FN Spoon, New York 1993.

Rossing T.D., Springer Handbook of Acoustics, Sturtz AG, Wurzburg 2007.

Leizer I.G., Applicability of the Methods of Geometric Acoustics for the Calculation of Sound Reflection from Plane Surfaces, Soviet Physics – Acoustics, 12 (2), 1966.

Long M., Architectural Acoustics, Elsevier Academic Press, chapter 7, 2006.

Rindel J.H., Design of New Ceiling Reflectors for Improved Ensemble in a Concert Hall, Applied Acoustics 34, 1991.

Skålevik M., Low frequency Limits of Reflector arrays, Institute of Acoustics IOA conference on Auditorium Acoustics, Copenhagen 2006.

Kamisiński T., Szeląg A., Rubacha J., Sound reflection from overhead stage canopies depending on ceiling modification, Archives of Acoustic, 37 (2), 2012, 213-218.

Meisenbacher K., Development and evaluation of an adaptive Logatom test to determine consonant understandability; [in German] Graduate thesis, Fachhochschule Oldenburg, 2008.

ISO/TR 4870, Acoustics – The Construction and Calibration of Speech Intelligibility Tests, International Organization for Standardization, 1991.

ITU-T Recommendation P.800, Method for Subjective Determination of Transmission Quality, International Telecommunication Union, Geneva, Switzerland 1996.

Brachmańsk S., The Subjective Measurements of Speech Quality in Rooms, Proc. of Subjective and Objective Assessment of Sound, Poznań, September 1–3, 2004.