Improving speech intelligibility in classrooms through the mirror image model

Ning Han, Cheuk Ming Mak

Research output: Journal article publicationJournal articleAcademic researchpeer-review

5 Citations (Scopus)


Optimal classroom acoustical design can directly enhance students' learning efficiency. Effective acoustical designs are important and necessary to achieve a high degree of speech intelligibility for listeners. A speech intelligibility metric, U50, at different receiver positions in a classroom of 10 m × 8 m × 6 m was obtained by numerical simulations based on the mirror image model, with and without the uniform surface absorption coefficient. Comparisons show that increasing the absorption coefficient at the back wall can increase the speech intelligibility metric U50to the largest extent in the classroom. A numerical case study was then conducted in a typical classroom of 10 m × 10 m × 3.5 m, and the speech intelligibility was assessed through a third-order polynomial of Wonyoung and Murray [Wonyoung Y, Murray H. Auralization study of optimal reverberation times for speech intelligibility for normal and hearing-impaired listeners in classrooms with diffuse sound field. J Acoust Soc Am 2006;120(2):801-7].
Original languageEnglish
Pages (from-to)945-950
Number of pages6
JournalApplied Acoustics
Issue number11
Publication statusPublished - 1 Nov 2008


  • Acoustical design
  • Classroom
  • Speech intelligibility metric

ASJC Scopus subject areas

  • Acoustics and Ultrasonics


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