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Related Experiment Videos

Detecting pitch-pulse asynchronies and differences in fundamental frequency

R P Carlyon1

  • 1Laboratory of Experimental Psychology, University of Sussex, Brighton, England.

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

Listeners can detect differences in fundamental frequency (delta F0s) by perceiving pitch-pulse asynchronies (PPAs). The threshold for detecting PPAs remained constant at 2.5 ms across various F0s, differing from previous findings.

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Area of Science:

  • Auditory Perception
  • Psychoacoustics
  • Signal Processing

Background:

  • The auditory system processes complex sounds, including those with multiple frequency components (formants).
  • Perception of pitch and timing is crucial for understanding complex auditory signals.
  • Distinguishing between pitch-pulse asynchronies (PPAs) and fundamental frequency differences (delta F0s) is key in auditory processing.

Purpose of the Study:

  • To investigate the detection of pitch-pulse asynchronies (PPAs) and differences in fundamental frequency (delta F0s) between simultaneous formants.
  • To compare psychometric functions for detecting delta F0s and constant PPAs.
  • To determine the role of onset asynchronies in the detection of PPAs and delta F0s.

Main Methods:

  • Experiments involved presenting listeners with simultaneous formants composed of closely spaced sinusoidal components.

Related Experiment Videos

  • Psychometric functions were used to compare the detection of delta F0s and PPAs.
  • An adaptive procedure was employed to measure PPA thresholds across a range of F0s (20-125 Hz).

    • Main Results:

    • Introducing a delta F0 led to increasing asynchrony between pitch pulses in the formants.
    • Listeners could detect delta F0s by perceiving the resulting asynchrony under certain conditions.
    • The threshold PPA for detection was consistently around 2.5 ms for F0s between 20 and 125 Hz.
    • Onset asynchronies aided, but were not essential for, the detection of both PPAs and delta F0s.

    Conclusions:

    • Listeners can detect fundamental frequency differences by perceiving pitch-pulse asynchronies.
    • The threshold for pitch-pulse asynchrony detection is constant in time (milliseconds), not phase (degrees), differing from envelope asynchrony detection.
    • Onset cues facilitate, but are not strictly necessary for, the perception of temporal disparities in complex tones.