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Temporal modulation transfer functions based upon modulation thresholds.

N F Viemeister

    The Journal of the Acoustical Society of America
    |November 1, 1979
    PubMed
    Summary
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    This study quantifies temporal resolution using amplitude modulation detection. The temporal modulation transfer function (TMTF) reveals lowpass characteristics, extending to 2 kHz under specific conditions.

    Area of Science:

    • Auditory Perception
    • Psychoacoustics
    • Signal Processing

    Background:

    • Temporal resolution is crucial for auditory perception.
    • Detecting amplitude modulation without spectral cues offers a way to measure this resolution for steady-state signals.
    • Previous research has established basic characteristics of temporal modulation transfer functions (TMTFs).

    Purpose of the Study:

    • To quantitatively describe temporal resolution for steady-state signals.
    • To measure modulation thresholds as a function of modulation frequency.
    • To investigate the influence of various parameters on the TMTF.

    Main Methods:

    • Measured modulation thresholds for sinusoidally amplitude-modulated wideband noise across different modulation frequencies.

    Related Experiment Videos

  • Investigated the effect of eliminating the increment in average power produced by modulation.
  • Examined parametric effects including overall sound level, center frequency, modulation duration, and carrier gating.

    • Main Results:

    • The TMTF exhibited a lowpass characteristic up to approximately 800 Hz, extending to 2 kHz when power increments were removed.
    • TMTFs were largely independent of overall sound level, except at very low intensities.
    • A model with a lowpass filter (2.5 ms time constant) effectively described the TMTF and other modulation functions.

    Conclusions:

    • Temporal resolution for amplitude modulation is characterized by a lowpass TMTF.
    • The auditory system's temporal processing is influenced by factors like modulation frequency and carrier properties.
    • The findings raise questions about the role of peripheral auditory filtering in high-frequency modulation detection.