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Related Experiment Videos

Spectro-temporal processing in the envelope-frequency domain.

Stephan D Ewert1, Jesko L Verhey, Torsten Dau

  • 1Carl von Ossietzky Universität Oldenburg, Medizinische Physik, D-26111 Oldenburg, Germany. se@medi.physik.uni-oldenburg.de

The Journal of the Acoustical Society of America
|January 2, 2003
PubMed
Summary
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This study explored modulation masking, finding that "venelope" fluctuations, similar to envelope fluctuations, are key. These fluctuations appear to be processed by a common auditory mechanism, impacting how we perceive modulated sounds.

Area of Science:

  • Auditory Perception
  • Psychoacoustics
  • Signal Processing

Background:

  • Amplitude modulation (AM) processing is crucial for auditory perception.
  • Modulation masking, where one modulation masks another, is influenced by factors like carrier frequency and modulation depth.
  • The role of "venelope" (second-order envelope fluctuations) in modulation masking is not fully understood.

Purpose of the Study:

  • To investigate frequency selectivity in amplitude modulation applied to tonal carriers.
  • To determine the role of beats between modulators in modulation masking.
  • To explore the processing of envelope and venelope fluctuations in the auditory system.

Main Methods:

  • Experiment 1: Measured masked threshold patterns (MTPs) for various signal modulation frequencies and carrier frequencies using narrow-band-noise masker modulation.

Related Experiment Videos

  • Experiment 2: Assessed the involvement of modulation beats in tone-in-noise (TN), noise-in-tone (NT), and tone-in-tone (TT) modulation masking.
  • Experiment 3: Investigated the effect of an additional masker at the beat frequency on TT masked-threshold patterns.

    • Main Results:

    • MTP shape and bandwidth were independent of signal modulation frequency and carrier frequency.
    • Tone-in-tone masking thresholds were lowest and strongly influenced by envelope beat detection.
    • Adding a masker at the beat frequency increased thresholds, suggesting a common processing mechanism for envelope and venelope fluctuations.

    Conclusions:

    • Venelope fluctuations play a significant role in modulation masking, analogous to envelope fluctuations in spectral masking.
    • A common auditory mechanism likely processes both envelope and venelope fluctuations.
    • A general model for processing these fluctuations is proposed based on the empirical findings.