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Related Experiment Videos

Evaluating the articulation index for auditory-visual consonant recognition

K W Grant1, B E Walden

  • 1Walter Reed Army Medical Center, Army Audiology and Speech Center, Washington, DC 20307-5001, USA.

The Journal of the Acoustical Society of America
|October 1, 1996
PubMed
Summary
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The ANSI standard for calculating the articulation index (AI) is inadequate for predicting auditory-visual speech recognition under filtered conditions. Speech frequency bands significantly impact combined auditory-visual benefits, contrary to standard predictions.

Area of Science:

  • Audiology
  • Speech Science
  • Acoustics

Background:

  • The ANSI S3.5-1969 (R1986) standard provides a method for calculating the articulation index (AI).
  • The AI is used to predict speech intelligibility based on auditory information.
  • Its adequacy for auditory-visual (AV) speech recognition, especially under altered acoustic conditions, requires further evaluation.

Purpose of the Study:

  • To assess the adequacy of the ANSI standard for predicting AV consonant recognition.
  • To investigate the impact of bandpass-filtered speech on auditory (A), visual (V), and AV consonant recognition.
  • To compare measured AV performance with predictions from the ANSI auditory-visual AI procedure.

Main Methods:

  • Consonant recognition was measured under various bandpass-filtered speech conditions.

Related Experiment Videos

  • Auditory (A), visual (V), and auditory-visual (AV) recognition scores were collected.
  • Auditory error patterns were analyzed to assess redundancy and benefits of combined cues.

    • Main Results:

    • Auditory AI values did not consistently predict AV AI values across different filter conditions.
    • Low-frequency speech bands provided greater benefit to AV recognition than high-frequency bands.
    • A negative correlation was found between auditory and visual redundancy and the benefit of combined AV cues.

    Conclusions:

    • The current ANSI auditory-visual AI procedure is insufficient for predicting AV consonant recognition under spectrally shaped conditions.
    • Speech frequency content significantly influences the effectiveness of combined auditory and visual speech information.
    • The ANSI standard may need revision to account for spectral shaping effects on AV speech perception.