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Some observations on the lateralization of complex waveforms

G B Henning

    The Journal of the Acoustical Society of America
    |August 1, 1980
    PubMed
    Summary
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    Auditory perception depends on signal frequency. High frequencies rely on envelope delays for sound localization, while low frequencies depend on carrier delays. This impacts models of auditory processing.

    Area of Science:

    • Auditory Neuroscience
    • Psychoacoustics
    • Signal Processing

    Background:

    • Sound localization relies on interaural time differences (ITDs).
    • The processing of ITDs differs for various signal types and frequencies.
    • Understanding ITD processing is crucial for auditory models.

    Purpose of the Study:

    • To investigate the role of envelope and carrier delays in sound lateralization.
    • To determine how frequency affects the detectability of envelope versus carrier delays.
    • To examine lateralization performance with frequency-modulated (FM) and quasi-FM signals.

    Main Methods:

    • Psychoacoustic experiments using high- and low-frequency amplitude-modulated (AM) signals.
    • Experiments with frequency-modulated (FM) and quasi-frequency-modulated signals.

    Related Experiment Videos

  • Varying interaural delays in the envelope and carrier components of the signals.

    • Main Results:

    • High-frequency AM signals: Lateralization relies on envelope delays, not carrier delays.
    • Low-frequency AM signals: Lateralization relies on carrier delays, not envelope delays.
    • FM and quasi-FM signals: Require larger delays for lateralization compared to AM signals.

    Conclusions:

    • Auditory system utilizes different cues (envelope vs. carrier delays) for lateralization based on signal frequency.
    • Findings provide constraints for models of auditory envelope extraction.
    • Further research is needed to fully elucidate the mechanisms of auditory lateralization.