Subjective indices related to speech transmission in classrooms - An appraisal

Arianna Astolfi, Pasquale Bottalico, Gianfranco Genta, Giulio Barbato, Raffaello Levi

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Speech intelligibility is a subjective performance index defined as the percentage of a message understood correctly. Often the results of speech intelligibility tests would suggest that conditions are acceptable, with Intelligibility Score (IS) of the order of 90% or more, however even if the intelligibility is so good, speech transmission performance may not be satisfactory. Subjective ratings of the Listening Easiness Score (LES) provide an alternative approach. A total of 2176 intelligibility tests were administered in a primary school to 272 pupils, yielding an useful data set of 1912 values. The Speech Transmission Index (STI) was also measured for each test setting in seven different positions in the laboratory classroom used for the test. Both IS and LES are inherently bounded, and their data distributions exhibit a significant accumulation of scores in the upper part, mainly for IS. The resulting truncation problem have been addressed in order to allow meaningful comparison between indices.

Original languageEnglish (US)
Title of host publicationEURONOISE 2012 - 9th European Conference on Noise Control
Number of pages6
StatePublished - 2012
Externally publishedYes
Event9th European Conference on Noise Control, EURONOISE 2012 - Prague, Czech Republic
Duration: Jun 10 2012Jun 13 2012

Publication series

NameProceedings - European Conference on Noise Control
ISSN (Print)2226-5147


Other9th European Conference on Noise Control, EURONOISE 2012
CountryCzech Republic

ASJC Scopus subject areas

  • Acoustics and Ultrasonics
  • Public Health, Environmental and Occupational Health
  • Building and Construction
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Automotive Engineering
  • Aerospace Engineering

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