Assistive Listening Knowledge Base
  • Conference paper

Speech intelligibility derived from asynchronous processing of auditory-visual information

From https://assistivelisteningknowledgebase.org/evidence/grant-greenberg-2001/ · record checked 9 October 2026

  • Grant KW, Greenberg S
  • Proceedings of Auditory-Visual Speech Processing (AVSP) 2001, pp. 132-137 (ISCA Archive)

Independent (Walter Reed Army Medical Center and International Computer Science Institute; US National Science Foundation grant)

Summary

Measured how audio-visual speech intelligibility changes when the sound leads or lags the talker's face.

Key findings

  • Nine listeners with normal hearing watched recorded sentences with the audio reduced to two narrow frequency bands; with audio and video in step, intelligibility averaged 63%.
  • When the audio led the video, intelligibility fell appreciably even at the shortest lead tested, 40 ms, and declined further with longer leads.
  • When the video led (the audio lagged), intelligibility stayed relatively stable for lags up to about 160 to 200 ms.

Limits

Nine listeners with normal hearing; audio deliberately filtered to two narrow bands rather than full-bandwidth speech; recorded speech rather than a live room.

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www.isca-archive.org/avsp_2001/grant01_avsp.html

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Cite this source

Grant KW, Greenberg S. Speech intelligibility derived from asynchronous processing of auditory-visual information. Proceedings of Auditory-Visual Speech Processing (AVSP) 2001, pp. 132-137 (ISCA Archive). September 2001. https://www.isca-archive.org/avsp_2001/grant01_avsp.html (accessed 9 October 2026).

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