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Related Experiment Videos

Spectral loudness summation as a function of duration.

Jesko L Verhey1, Birger Kollmeier

  • 1Medizinische Physik and Gradutiertenkolleg Psychoakustik, Universität Oldenburg, Germany. jlv23@cam.ac.uk

The Journal of the Acoustical Society of America
|April 5, 2002
PubMed
Summary

Signal duration significantly impacts perceived loudness, with shorter signals (10 ms) showing greater differences in loudness across bandwidths compared to longer signals (1000 ms). This suggests loudness models need duration-dependent adjustments for accurate spectral loudness summation.

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Area of Science:

  • Auditory perception
  • Psychoacoustics
  • Signal processing

Background:

  • Spectral loudness summation describes how the perceived loudness of a sound increases with its bandwidth.
  • The influence of signal duration on spectral loudness summation is not fully understood.
  • Existing loudness models may not adequately account for duration-dependent effects.

Purpose of the Study:

  • To investigate the effect of signal duration on spectral loudness summation.
  • To quantify the relationship between signal bandwidth, duration, and perceived loudness.
  • To inform the development of more accurate loudness models.

Main Methods:

  • Loudness was measured using a two-interval, two-alternative forced-choice procedure with an adaptive level.
  • Bandpass-filtered noise signals centered at 2 kHz were used, with bandwidths ranging from 200 Hz to 6400 Hz.

Related Experiment Videos

  • A loudness matching procedure with interleaved tracks compared signals of varying durations (10, 100, 1000 ms) and bandwidths.

    • Main Results:

    • Spectral loudness summation is dependent on signal duration.
    • A 6- to 8-dB larger level difference was observed between narrow (200 Hz) and wide (6400 Hz) bandwidth signals for 10-ms signals compared to 1000-ms signals.
    • This duration effect diminished slightly with increasing reference loudness.

    Conclusions:

    • Loudness models should incorporate a duration-dependent compression stage to accurately predict perceived loudness.
    • Alternatively, loudness ratios between signals of different durations should be adjusted based on signal spectrum.
    • Understanding duration's role in spectral loudness summation is crucial for auditory modeling.