Improving Speech Intelligibility in Classrooms by Decreasing Sound Energy of Low Frequency

  • Wei LinEmail author
  • Hsuan Lin
  • Kung-Huang Huang
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 9176)


Speech intelligibility is one of the sound field quality evaluation criteria, class-room space needed to create a low-noise and clear listening environment. In addition to the reverberation time (sec), chamber volume (m3) and speech clarity (dB) can tolerate higher use of space and other influencing factors of critical sound energy at low frequency, the spatial frequency factor for indoor conversation came the noise amplification effect will affect listening clarity. Evaluative standard of Rapid Speech Intelligibility (RASTI) for an indoor sound field has been studied for a long time, only 500 Hz and 2 K-Hz cannot be precisely estimated the impact of low frequency noise. After making a Chinese phase and sentence questionnaire for the test, studies will be conducted objective and subjective verification verified statement containing the real class-room space by physical quantities (Reverberation time (RT30, sec) and Signal to noise ratio (S/N ratio, dB) of low-frequency sound energy is correlated be-tween with objective measurement, and subjective test of virtual classrooms is also be made in anechoic chamber to correspond with the low frequency impact factor of speech intelligibility index.


Speech intelligibility Low frequency of sound energy Virtual sound field Subjective test 



The authors wish to thank Huang Kung Huang, Natural Acoustic for the helps of filed measurements, and Professor Wei-Hwa Chiang, Dep. of Architecture, National Taiwan University of Science and Technology the kindly assistances during the measurement phase.


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Copyright information

© Springer International Publishing Switzerland 2015

Authors and Affiliations

  1. 1.Department of Interior DesignHwa Hsia University of TechnologyTaipeiTaiwan
  2. 2.Department of Product DesignTainan University of TechnologyTainanTaiwan
  3. 3.General ManagerShang You Construction Co. Ltd.KaohsiungTaiwan

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