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Related Experiment Videos

Discrimination of envelope frequency.

S Buus

    The Journal of the Acoustical Society of America
    |December 1, 1983
    PubMed
    Summary
    This summary is machine-generated.

    This study measured envelope frequency discrimination using two-tone complexes. Results show envelope frequency is a useful cue for auditory discrimination up to a certain point, especially for monotic stimuli.

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    Area of Science:

    • Auditory Neuroscience
    • Psychoacoustics

    Background:

    • Envelope frequency plays a role in auditory perception.
    • Understanding envelope frequency discrimination is crucial for auditory models.

    Purpose of the Study:

    • To measure envelope frequency discrimination thresholds.
    • To investigate the influence of center frequency (CF) and envelope frequency on discrimination.
    • To compare discrimination for different stimulus types (monotic, dichotic, pure tones).

    Main Methods:

    • Measured just noticeable differences (jnds) in envelope frequency for two-tone complexes at various CFs (500-4000 Hz).
    • Tested stimuli at different sound pressure levels (SPL) and with masking to assess distortion product influence.
    • Compared monotic two-tone complexes with pure tones, three-tone complexes, and dichotic two-tone complexes.

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    Main Results:

    • Jnds were constant up to a critical envelope frequency (10-20% of CF), then increased.
    • Discrimination improved with CF below the critical envelope frequency.
    • Monotic two-tone complexes showed better discrimination than other tested stimuli at narrow frequency separations.
    • Aural distortion had minimal influence on results.

    Conclusions:

    • Envelope frequency serves as an auditory discrimination cue up to 30-40% of CF.
    • Auditory filter characteristics limit the effectiveness of envelope frequency cues at higher frequencies.
    • Discrimination performance depends on the temporal envelope's slope and stimulus type.