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Modulation masking produced by second-order modulators.

Christian Füllgrabe1, Brian C J Moore, Laurent Demany

  • 1Laboratoire de Psychologie Expérimentale--UMR CNRS 8581, Université René Descartes--Paris 5, 71 avenue Edouard Vaillant, 92774 Boulogne-Billancourt, France. c.fullgrabe@psychol.cam.ac.uk

The Journal of the Acoustical Society of America
|May 19, 2005
PubMed
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Auditory systems create a first-order amplitude modulation from second-order modulation, aiding perception. This study quantifies this modulation distortion component, finding it contributes 5%-12% to perception.

Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics

Background:

  • Second-order sinusoidal amplitude modulation (SAM) perception is influenced by a first-order SAM component.
  • This component may arise from auditory nonlinearities or cochlear filtering.

Purpose of the Study:

  • To investigate the origin of the first-order SAM component in second-order SAM perception.
  • To quantify the contribution of nonlinear auditory mechanisms versus cochlear filtering.

Main Methods:

  • Detection of a first-order SAM probe in the presence of a second-order SAM masker.
  • Varied masker-carrier modulation frequency, probe-masker phase, and probe modulation depth.
  • Used both tonal (5-kHz sinusoid) and noise carriers, with and without notched-noise masking.

Main Results:

Related Experiment Videos

  • Detection performance data suggest the existence of a modulation distortion component.
  • The phase yielding poorest detection varied (0-180 degrees) across conditions.
  • Estimated modulation distortion component magnitude ranged from 5% to 12%.

Conclusions:

  • Both nonlinear auditory mechanisms and cochlear filtering/off-frequency listening contribute to second-order SAM perception.
  • A distinct modulation distortion component, likely from nonlinearities, is present and quantifiable.