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Signal properties that reduce masking by simultaneous, random-frequency maskers

D L Neff1

  • 1Boys Town National Research Hospital, Omaha, Nebraska 68131, USA.

The Journal of the Acoustical Society of America
|October 1, 1995
PubMed
Summary
This summary is machine-generated.

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Reducing auditory masking involves manipulating signal properties. Shortening signal duration significantly decreased masking caused by stimulus uncertainty, offering a promising strategy for improving auditory perception.

Area of Science:

  • Auditory perception
  • Psychoacoustics
  • Signal processing

Background:

  • Simultaneous masking in auditory perception can be substantial, often stemming from informational masking due to stimulus uncertainty.
  • Multicomponent maskers with changing frequency content exacerbate this masking effect.

Purpose of the Study:

  • To investigate if altering signal properties or presentation mode can enhance signal saliency and mitigate informational masking.
  • To determine the effectiveness of different signal types, durations, and presentation modes in reducing masking.

Main Methods:

  • Experiments varied the number of masker components (2-100) and used a 1000-Hz sinusoid as the reference signal.
  • Signal types included amplitude-modulated (AM), quasifrequency-modulated (QFM), and narrow-band noise (NBN) signals.

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  • Signal durations (100 ms or 10 ms) and presentation modes (diotic, dichotic, cross-ear) were systematically manipulated.

    • Main Results:

    • AM and NBN signals generally improved performance, while QFM signals sometimes degraded it.
    • Dichotic presentation reduced masking more consistently than monaural presentation across listeners and conditions.
    • Shortening signal duration (10 ms) yielded the most significant and reliable reductions in masking attributed to masker-frequency uncertainty.

    Conclusions:

    • Signal duration is a critical factor in reducing masking related to auditory uncertainty.
    • While dichotic presentation offers benefits, its advantage may not solely be due to reduced uncertainty.
    • Manipulating signal onset/offset times provides a robust method for enhancing signal detection in uncertain masker environments.