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Factors affecting the duration effect in pitch perception for unresolved complex tones.

Louise J White1, Christopher J Plack

  • 1Laboratory of Experimental Psychology, University of Sussex, Brighton BN1 9QG, United Kingdom. l.white@kingston.ac.uk

The Journal of the Acoustical Society of America
|January 13, 2004
PubMed
Summary

The duration of complex tones significantly impacts fundamental frequency (F0) discrimination. Longer tones improve F0 perception, especially at lower F0s, with envelope repetition rate being the key factor.

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Area of Science:

  • Auditory perception
  • Psychoacoustics
  • Signal processing

Background:

  • Fundamental frequency (F0) discrimination thresholds for complex tones with unresolved harmonics improve with increasing tone duration.
  • The spectral region and phase of harmonics influence the perceived pitch and envelope of complex tones.

Purpose of the Study:

  • To investigate the effect of tone duration on F0 discrimination for complex tones with varying fundamental frequencies (F0s) and spectral characteristics.
  • To determine the relative importance of envelope repetition rate versus spectral region in F0 discrimination.

Main Methods:

  • F0 discrimination was measured for complex tones with F0s of 62.5, 125, and 250 Hz.
  • Tones were bandpass filtered into specific spectral regions (2750-3750 Hz and 5500-7500 Hz) and presented in sine (SINE) or alternating (ALT) phase.

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  • Tone durations varied across 20, 40, 80, and 160 ms.

    • Main Results:

    • F0 discrimination improved with increasing tone duration, with the effect being more pronounced for lower F0s.
    • Thresholds decreased significantly with duration, e.g., from ~30% to ~3% for 62.5 Hz F0 in the lower spectral region.
    • A lower envelope repetition rate resulted in a larger change in performance with increasing duration. The duration effect was smaller for ALT compared to SINE phase complexes.

    Conclusions:

    • Envelope repetition rate, rather than spectral region, is the primary determinant of F0 discrimination thresholds for unresolved complex tones.
    • Envelope characteristics significantly influence the magnitude of the duration effect in F0 discrimination.