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Temporal properties in clear speech perception.

Sheng Liu1, Fan-Gang Zeng

  • 1Hearing and Speech Research Laboratory, Department of Biomedical Engineering, University of California, Irvine, Irvine, California 92697, USA.

The Journal of the Acoustical Society of America
|August 1, 2006
PubMed
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Clear speech perception relies on multiple acoustic cues. Both temporal envelope and fine structure contribute, with their importance varying by signal-to-noise ratio, impacting speech intelligibility.

Area of Science:

  • Auditory Neuroscience
  • Speech Perception Research
  • Acoustic Signal Processing

Background:

  • Clear speech is more intelligible than conversational speech.
  • Understanding the acoustic cues underlying clear speech is crucial for speech processing research.
  • Previous studies have explored various acoustic modifications but isolating specific cues remains challenging.

Purpose of the Study:

  • To investigate the relative contributions of speaking rate, temporal envelope, and temporal fine structure to the clear speech advantage.
  • To determine how these acoustic cues affect speech intelligibility in normal-hearing listeners across different noise levels.

Main Methods:

  • Three experiments were conducted: uniform time scaling, gap insertion in conversational speech, and auditory chimeras (swapping temporal envelope and fine structure).

Related Experiment Videos

  • Speech intelligibility was measured using speech reception thresholds (SRT) across various signal-to-noise ratios (SNRs).

    • Main Results:

    • Uniform time scaling introduced processing artifacts that reduced intelligibility.
    • Increasing silent gaps in conversational speech improved SRT by 1.3 dB, potentially due to level normalization.
    • Auditory chimeras revealed that temporal envelope is more critical at high SNRs, while temporal fine structure is more important at low SNRs.

    Conclusions:

    • The clear speech advantage is supported by multiple, distributed acoustic cues.
    • Both temporal envelope and temporal fine structure play significant roles in enhancing speech perception.
    • The relative importance of these cues shifts depending on the listening conditions, particularly the noise level.