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Related Experiment Video

Updated: Mar 10, 2026

Author Spotlight: Investigating the Impact of Emotional Prosodies on Voice Recognition and Perception
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Speech recognition for multiple bands: Implications for the Speech Intelligibility Index.

Larry E Humes1, Gary R Kidd1

  • 1Department of Speech and Hearing Sciences, Indiana University, Bloomington, Indiana 47405-7002, USA.

The Journal of the Acoustical Society of America
|December 5, 2016
PubMed
Summary
This summary is machine-generated.

The Speech Intelligibility Index (SII) assumes speech bands are independent. This study found that how speech is divided into frequency bands significantly impacts intelligibility, challenging the SII's core assumption.

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Area of Science:

  • Audiology
  • Speech Science
  • Acoustics

Background:

  • The Speech Intelligibility Index (SII) is a widely used model predicting speech understanding.
  • The SII model assumes that the contribution of different frequency bands to speech intelligibility is additive and independent.

Purpose of the Study:

  • To test the SII's assumption of band independence.
  • To investigate how different frequency band configurations affect speech recognition.

Main Methods:

  • Open-set word and sentence recognition were measured in quiet and noise.
  • Speech stimuli were filtered into various combinations of 20 frequency bands with equivalent SII importance.
  • Nine groups of young adults with normal hearing evaluated the filtered speech.

Main Results:

  • Speech recognition performance varied significantly across different band patterns, even when the overall SII value was equal.
  • Band patterns concentrating energy in low or high frequencies resulted in lower scores compared to those with broader spectral sampling.
  • Equal SII values did not consistently predict equal speech recognition performance.

Conclusions:

  • The study challenges the SII's assumption of acoustic band independence.
  • Speech intelligibility is influenced by the spectral distribution of speech, not just the overall weighted importance.
  • While spectral distortions tested may be uncommon in daily listening, the findings question the SII's fundamental theoretical basis.