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Related Experiment Videos

Thresholds for hearing mistuned partials as separate tones in harmonic complexes.

B C Moore, B R Glasberg, R W Peters

    The Journal of the Acoustical Society of America
    |August 1, 1986
    PubMed
    Summary

    Listeners can detect a mistuned harmonic when it deviates by 1-3% from its expected frequency. This perception threshold varies with harmonic number and stimulus duration, impacting auditory stream formation.

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    Area of Science:

    • Psychoacoustics
    • Auditory Perception
    • Signal Processing

    Background:

    • Harmonic complex tones are fundamental to musical perception.
    • Mistuning of individual harmonics can alter the perceived pitch and structure of a complex tone.
    • Understanding the limits of harmonic perception is crucial for auditory models.

    Purpose of the Study:

    • To quantify the degree of harmonic mistuning required for a partial to be perceived as a separate tone.
    • To investigate how harmonic number and stimulus duration influence this mistuning threshold.
    • To explore the implications for theories of auditory stream segregation.

    Main Methods:

    • Psychoacoustic experiment using complex tones with 10 or 12 equal-amplitude components.
    • Adaptive procedure to determine mistuning thresholds for the first six harmonics.

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  • Varying fundamental frequency (100-400 Hz) and stimulus duration (50-1610 ms).

    • Main Results:

    • Mistuning thresholds typically ranged from 1% to 3% of the harmonic frequency.
    • Higher thresholds were observed for lower harmonics (1st-2nd) at 100 Hz fundamental.
    • Thresholds significantly increased (3-5 fold) with decreased stimulus duration (50 ms vs. 1610 ms).

    Conclusions:

    • The auditory system has a precise sensitivity to harmonic relationships.
    • Perceptual salience of a mistuned harmonic depends on its position and the temporal context.
    • Results support models like the harmonic sieve in explaining perceptual stream formation.