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Thresholds for the detection of inharmonicity in complex tones.

B C Moore, R W Peters, B R Glasberg

    The Journal of the Acoustical Society of America
    |May 1, 1985
    PubMed
    Summary

    Listeners detect inharmonicity in complex tones by noticing a mistuned partial standing out or by perceiving beats/roughness. Detection thresholds vary with harmonic frequency and stimulus duration.

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    Area of Science:

    • Psychoacoustics
    • Auditory Perception
    • Signal Processing

    Background:

    • Complex tones are fundamental to music and speech perception.
    • Distinguishing harmonic from inharmonic components is crucial for auditory scene analysis.
    • Previous research has explored pitch perception but less on inharmonicity detection thresholds.

    Purpose of the Study:

    • To measure detection thresholds for inharmonicity in complex tones.
    • To investigate how fundamental frequency and stimulus duration affect inharmonicity perception.
    • To differentiate detection mechanisms for low versus high harmonics.

    Main Methods:

    • Participants identified mistuned partials in complex tones using a two-alternative forced-choice task.
    • Thresholds were determined for individual harmonics across different fundamental frequencies (100-400 Hz) and durations (50-1610 ms).
    • Stimuli consisted of complex tones with harmonics at equal sound pressure levels (60 dB SPL).

    Main Results:

    • Inharmonicity detection thresholds were approximately 4 Hz for lower harmonics, relatively constant across fundamental frequencies.
    • For higher harmonics, detection thresholds significantly increased as stimulus duration decreased.
    • Lower harmonics were detected by their distinctness, while higher harmonics were detected via beats or roughness.

    Conclusions:

    • Inharmonicity detection mechanisms differ for low and high harmonics.
    • Low harmonic detection relies on a "stand out" effect.
    • High harmonic detection involves sensitivity to phase changes, perceived as beats or roughness.

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