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Remote masking generated by high-frequency two-tone complexes

R S Karlovich, H A Osier

    Audiology : Official Organ of the International Society of Audiology
    |November 1, 1977
    PubMed
    Summary
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    Remote masking, a phenomenon where high-frequency sounds mask lower frequencies, was studied using two-tone complexes. Findings suggest this auditory masking results from aural distortion, impacting hearing perception.

    Area of Science:

    • Auditory perception
    • Psychoacoustics
    • Hearing science

    Background:

    • Auditory masking describes how one sound can obscure another.
    • Remote masking occurs when high-frequency sounds affect lower-frequency hearing.
    • Understanding remote masking mechanisms is crucial for hearing research.

    Purpose of the Study:

    • To investigate remote masking using two-tone complexes.
    • To analyze the effects of frequency separation and sound pressure level (SPL) on remote masking.
    • To explore the underlying causes of remote masking.

    Main Methods:

    • Measured auditory masking in 10 young adults with normal hearing.
    • Utilized two-tone complexes centered around 7000 Hz as maskers.
    • Varied the frequency separation (deltaf) and SPL of the masker components.

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    Main Results:

    • Remote masking was observed for test signals within the masker's deltaf region.
    • Masking increased with masker SPL, but less steeply than with noise maskers.
    • Masking magnitude remained relatively constant with deltaf for a given SPL.

    Conclusions:

    • High-frequency two-tone complexes can mask low-frequency sounds.
    • Results support the hypothesis that aural distortion is the primary cause of remote masking.
    • This study contributes to understanding complex auditory masking phenomena.