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Evaluating speech intelligibility with wide dynamic range compression (WDRC) requires assessing the entire psychometric function. Relying solely on speech reception thresholds (SRT50) may miss important effects of WDRC on understanding speech in noise.

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Area of Science:

  • Audiology
  • Signal Processing
  • Speech Perception

Background:

  • Assessing nonlinear signal processing effects on speech intelligibility in noise is challenging.
  • Traditional methods using fixed signal-to-noise ratios (SNRs) or speech reception thresholds (SRT50) may not fully capture processing impacts.
  • SRT50, while time-efficient, might offer a limited view of processing effects across the psychometric function.

Purpose of the Study:

  • To evaluate the utility of estimating the entire psychometric function for assessing speech intelligibility.
  • To investigate the impact of wide dynamic range compression (WDRC) on speech intelligibility in various noise conditions.
  • To compare different methods for estimating psychometric functions in the context of WDRC.

Main Methods:

  • Employed a fast, local linear fitting approach to estimate psychometric functions.
  • Utilized two adaptive procedures to measure speech intelligibility.
  • Tested normal-hearing subjects in stationary and interrupted speech-shaped noise with and without WDRC.

Main Results:

  • The effects of WDRC on speech intelligibility were found to be dependent on the signal-to-noise ratio (SNR).
  • Performance differences varied across different points of the psychometric function when WDRC was applied.
  • Noise type (stationary vs. interrupted) influenced the observed effects of WDRC.

Conclusions:

  • Estimating the entire psychometric function provides a more comprehensive evaluation of WDRC effects than SRT50 alone.
  • Favorable and unfavorable impacts of WDRC on speech intelligibility can be obscured if only SRT50 values are considered.
  • SNR-dependent effects highlight the complexity of WDRC's influence on speech perception in noise.