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Related Experiment Videos

On the effect of interaural phase differences on loudness.

E Zwicker1, G B Henning

  • 1Institute for Electroacoustics, Technical University München, F.R.G.

Hearing Research
|May 1, 1991
PubMed
Summary

Loudness perception of tone bursts is influenced by interaural phase, especially at lower frequencies and signal-to-noise ratios. This effect diminishes at higher frequencies and sound levels, showing complex patterns in loudness matching.

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Area of Science:

  • Auditory perception
  • Psychoacoustics
  • Signal processing

Background:

  • Loudness perception is a complex auditory attribute.
  • Interaural phase differences (IPD) significantly impact auditory detection and localization.
  • The relationship between IPD and loudness perception requires further investigation, particularly across different frequencies and noise levels.

Purpose of the Study:

  • To investigate the influence of interaural phase on the perceived loudness of tone bursts.
  • To compare the effects of IPD on loudness perception across different frequencies (250 Hz, 710 Hz, 2 kHz).
  • To examine how signal-to-noise ratio and sound level affect the relationship between IPD and loudness.

Main Methods:

  • Monaurally presented Gaussian tone bursts (60 ms) were matched in loudness to binaurally presented pulses.

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  • Stimuli were embedded in continuous binaural noise at three different levels.
  • Observers adjusted either monaural or binaural stimuli to achieve loudness matches, with varying interaural phase conditions.

    • Main Results:

    • Significant differences in loudness were observed for 250- and 710-Hz tone bursts, dependent on IPD at low signal-to-noise ratios.
    • The effect of IPD on loudness was minimal for 2-kHz signals.
    • The influence of IPD on loudness decreased with increasing sound level but remained measurable at 250 Hz.
    • Loudness matching for out-of-phase signals showed proportional growth, while in-phase signals exhibited a level-dependent step.

    Conclusions:

    • Interaural phase plays a crucial role in loudness perception, particularly for lower frequencies and under conditions of masking.
    • The impact of IPD on loudness is frequency-dependent and diminishes at higher frequencies.
    • Loudness perception exhibits distinct patterns based on interaural phase conditions (in-phase vs. out-of-phase) and sound levels.