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On loudness at threshold

S Buus1, H Müsch, M Florentine

  • 1Northeastern University, Department of Electrical and Computer Engineering, Boston, Massachusetts 02115, USA.

The Journal of the Acoustical Society of America
|July 22, 1998
PubMed
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Listeners can detect multi-tone complexes even when components are below hearing threshold. Loudness perception at or below threshold is greater than zero for most individuals, influencing loudness functions.

Area of Science:

  • Auditory perception
  • Psychoacoustics
  • Loudness perception

Background:

  • Understanding loudness perception is crucial for audiology and acoustics.
  • Previous research has explored loudness functions across various intensity levels.
  • The role of subthreshold components in complex sound perception requires further investigation.

Purpose of the Study:

  • To assess the loudness function relating loudness to sensation level (SL) at low and moderate levels.
  • To investigate the detection and loudness of multi-tone complexes compared to pure tones.
  • To determine if tones at or below threshold contribute to perceived loudness.

Main Methods:

  • Absolute thresholds and loudness matches were measured for pure tones and multi-tone complexes.

Related Experiment Videos

  • Tone complexes consisted of 4 or 10 components with equal SLs, separated by critical bands.
  • Loudness functions were derived using a loudness summation model based on listener matches.

    • Main Results:

    • Multi-tone complexes were detectable even when individual components were below the hearing threshold.
    • Five of six listeners perceived loudness from tones at or below threshold.
    • Loudness function slopes exceeded unity at low levels and were approximately 0.2 at 40 dB SL.

    Conclusions:

    • Auditory detection of complex tones can benefit from multiple independent channels.
    • Perceived loudness can originate from sound components below the absolute threshold.
    • The derived loudness functions align with previous findings on temporal integration and other loudness measurement techniques.