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Quality ratings for frequency-shaped peak-clipped speech

J M Kates1, L Kozma-Spytek

  • 1Center for Research in Speech and Hearing Sciences, City University of New York, New York 10036.

The Journal of the Acoustical Society of America
|June 1, 1994
PubMed
Summary

Peak clipping in hearing aids distorts amplified speech quality. Adjusting clipping thresholds and frequency shaping significantly impacts how listeners rate speech clarity, with distortion effects modelable by a new index.

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Area of Science:

  • Audiology
  • Speech Processing
  • Signal Processing

Background:

  • Peak clipping is a common source of distortion in hearing aids.
  • This distortion can negatively impact the perceived quality of amplified speech.
  • Frequency-response shaping typically precedes peak clipping in hearing aid signal processing.

Purpose of the Study:

  • To investigate the impact of peak clipping on speech quality ratings.
  • To determine how different frequency response contours and clipping thresholds affect subjective speech quality.
  • To explore a distortion index for modeling the effects of peak clipping on speech quality.

Main Methods:

  • Normal-hearing subjects rated the quality of processed speech sentences on a ten-point scale.
  • Speech materials were processed with varying frequency response contours and clipping thresholds.
  • A distortion index was computed using magnitude-squared coherence of the speech-processing system with shaped-noise input.

Main Results:

  • Both the clipping threshold and its interaction with frequency-response shaping significantly influenced speech quality ratings.
  • The experimental findings demonstrate a clear relationship between signal processing parameters and subjective speech quality.
  • A distortion index derived from coherence successfully modeled the impact of distortion on speech quality.

Conclusions:

  • The parameters of frequency-response shaping and clipping thresholds are critical for maintaining speech quality in hearing aids.
  • The developed distortion index offers a quantifiable method to predict the perceptual impact of peak clipping.
  • Optimizing hearing aid signal processing requires careful consideration of the interplay between frequency shaping and clipping to minimize distortion.