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Related Experiment Videos

Difference limens for phase in normal and hearing-impaired subjects.

B C Moore1, B R Glasberg

  • 1Department of Experimental Psychology, University of Cambridge, England.

The Journal of the Acoustical Society of America
|October 1, 1989
PubMed
Summary

Listeners can detect phase shifts in harmonic complex tones, especially for higher harmonics and lower fundamental frequencies. This ability is crucial for auditory perception and can be affected by hearing impairment.

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Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics
  • Signal Processing

Background:

  • Harmonic complex tones are fundamental to speech and music perception.
  • Understanding phase sensitivity is key to deciphering auditory processing mechanisms.

Purpose of the Study:

  • To investigate the detection thresholds of phase shifts in individual harmonics of complex tones.
  • To explore the influence of harmonic number, fundamental frequency, and sound level on phase detection.
  • To examine the perceptual consequences of phase shifts, including pitch perception and auditory filter output.

Main Methods:

  • Participants listened to complex tones with a single phase-shifted harmonic.
  • Phase difference limens (DLs) were measured for different harmonic numbers, fundamental frequencies (50, 100, 200 Hz), and sound levels (70 dB SPL).

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  • Pitch-matching experiments and comparisons with randomized phase stimuli were conducted.

    • Main Results:

    • Detection thresholds were lowest for higher harmonics (above 8th) and lowest fundamental frequencies.
    • Phase shifts were undetectable for low harmonic numbers and increased with decreasing sound level.
    • Phase shifts induced a 'pop-out' effect, pure-tone quality, and altered pitch perception.

    Conclusions:

    • Auditory filter output waveforms are critical for explaining phase detection in complex tones.
    • Phase sensitivity is influenced by spectral position, fundamental frequency, and sound level.
    • Hearing impairment can affect phase sensitivity, with complex effects at different sensation levels.