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Frequency and intensity difference limens for harmonics within complex tones.

B C Moore, B R Glasberg, M J Shailer

    The Journal of the Acoustical Society of America
    |February 1, 1984
    PubMed
    Summary
    This summary is machine-generated.

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    This study found that the ability to distinguish frequency changes in complex tones depends on individual harmonics, with lower harmonics being easier to discern. Pitch perception in complex tones is predictable and likely relies on neural timing, not just place mechanisms.

    Area of Science:

    • Auditory perception
    • Psychoacoustics
    • Signal processing

    Background:

    • Complex tones are fundamental in sound perception, with pitch often determined by harmonic content.
    • Understanding frequency discrimination of individual harmonics is crucial for modeling pitch perception.
    • Previous models, like Goldstein's optimum processor theory, have attempted to predict pitch perception from harmonic properties.

    Purpose of the Study:

    • To measure frequency difference limens (DLs) for individual harmonics within complex tones.
    • To assess DLs for the overall periodicity of complex tones.
    • To investigate the role of place mechanisms versus temporal coding in frequency discrimination within complex tones.

    Main Methods:

    • A two-interval, two-alternative forced choice task was employed.

    Related Experiment Videos

  • Frequency DLs were estimated for individual harmonics and for the complex tone's periodicity.
  • Intensity DLs for individual harmonics were also measured.
  • An excitation-pattern model was used to test place mechanism adequacy.

    • Main Results:

    • Frequency DLs for low harmonics in equal-amplitude complex tones were small, increasing for higher harmonics.
    • The discriminability of high harmonics improved with increased relative level.
    • Complex tone DLs were generally smaller than the DL of their most discriminable component.
    • Goldstein's formula accurately predicted complex tone DLs from harmonic DLs.
    • Intensity DLs were smallest for low and the highest harmonics.

    Conclusions:

    • Place mechanisms alone are insufficient to explain frequency DLs of harmonics in complex tones.
    • The perception of complex tone frequency likely involves temporal coding of neural impulses.
    • High-order harmonics can significantly influence the overall frequency discrimination of a complex tone.