Sensitivity of the Speech Intelligibility Index to the Assumed Dynamic Range Purpose This study aims to evaluate the sensitivity of the speech intelligibility index (SII) to the assumed speech dynamic range (DR) in different languages and with different types of stimuli. Method Intelligibility prediction uses the absolute transfer function (ATF) to map the SII value to the predicted intelligibility ... Research Note
Research Note  |   June 10, 2017
Sensitivity of the Speech Intelligibility Index to the Assumed Dynamic Range
 
Author Affiliations & Notes
  • In-Ki Jin
    Division of Speech Pathology and Audiology, Research Institute of Audiology and Speech Pathology, Hallym University, Chuncheon, Gangwon-do, South Korea
  • James M. Kates
    Department of Speech, Language and Hearing Sciences, University of Colorado, Boulder
  • Kathryn H. Arehart
    Department of Speech, Language and Hearing Sciences, University of Colorado, Boulder
  • Disclosure: The authors have declared that no competing interests existed at the time of publication.
    Disclosure: The authors have declared that no competing interests existed at the time of publication. ×
  • Correspondence to In-Ki Jin: inkijin@gmail.com
  • Editor: Nancy Tye-Murray
    Editor: Nancy Tye-Murray×
  • Associate Editor: Todd Ricketts
    Associate Editor: Todd Ricketts×
Article Information
Speech, Voice & Prosodic Disorders / Special Populations / Cultural & Linguistic Diversity / Genetic & Congenital Disorders / Hearing / Research Note
Research Note   |   June 10, 2017
Sensitivity of the Speech Intelligibility Index to the Assumed Dynamic Range
Journal of Speech, Language, and Hearing Research, June 2017, Vol. 60, 1674-1680. doi:10.1044/2017_JSLHR-H-16-0348
History: Received August 31, 2016 , Revised November 28, 2016 , Accepted December 28, 2016
 
Journal of Speech, Language, and Hearing Research, June 2017, Vol. 60, 1674-1680. doi:10.1044/2017_JSLHR-H-16-0348
History: Received August 31, 2016; Revised November 28, 2016; Accepted December 28, 2016

Purpose This study aims to evaluate the sensitivity of the speech intelligibility index (SII) to the assumed speech dynamic range (DR) in different languages and with different types of stimuli.

Method Intelligibility prediction uses the absolute transfer function (ATF) to map the SII value to the predicted intelligibility for a given stimuli. To evaluate the sensitivity of the predicted intelligibility to the assumed DR, ATF-transformed SII scores for English (words), Korean (sentences), and Mandarin (sentences) were derived for DRs ranging from 10 dB to 60 dB.

Results Increasing the assumed DR caused steeper ATFs for all languages. However, high correlation coefficients between predicted and measured intelligibility scores were observed for DRs from 20 dB to 60 dB for ATFs in English, Korean, and Mandarin.

Conclusions Results of the present study indicate that the intelligibility computed from the SII is not sensitive to the assumed DR. The 30-dB DR commonly used in computing the SII is thus a reasonable assumption that produces accurate predictions for different languages and different types of stimuli.

Acknowledgments
This study was supported by Basic Science Research Program Grant NRF-2015R1C1A1A01052458 awarded to In-Ki Jin, through the National Research Foundation of Korea (NRF), funded by the Ministry of Science, ICT and Future Planning; and by Hallym University Research Fund Grant HRF-201503-003 (2015), awarded to In-Ki Jin.
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