Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

External and internal limitations in amplitude-modulation processing.

Stephan D Ewert1, Torsten Dau

  • 1Carl von Ossietzky Universität Oldenburg, Medizinische Physik, D-26111 Oldenburg, Germany. se@oersted.dtu.dk

The Journal of the Acoustical Society of America
|August 7, 2004
PubMed
Summary
This summary is machine-generated.

Related Concept Videos

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Cochlear aging after synaptopathic noise: age-noise interactions in hair cell loss and axonal degeneration.

Hearing research·2026
Same author

Acoustic Scene-Aware Processing and Auditory Model-Based Compensation Strategies.

Journal of the Association for Research in Otolaryngology : JARO·2026
Same author

Using more realistic speech material to enhance ecological validity in the Everyday Conversational Danish Sentence Test.

The Journal of the Acoustical Society of America·2026
Same author

Phoneme Perception in Children With Bilateral Cochlear Implants or Hearing Aids in Quiet, Noise, and Reverberation.

Ear and hearing·2026
Same author

A comparison of hearing abilities in memory clinic patients with mild cognitive impairment and cognitively intact older adults.

Journal of Alzheimer's disease : JAD·2026
Same author

Investigating the impact of background noise on collaborative decision-making using an individual-weighted voting model.

Cognitive research: principles and implications·2026
Same journal

Sibilant differentiation before and after tongue cancer surgery: Acoustics, kinematics and the role of sensorimotor controla).

The Journal of the Acoustical Society of America·2026
Same journal

BioNet-A: Ultrasonic echo representation network for target discrimination using active SONAR.

The Journal of the Acoustical Society of America·2026
Same journal

Empty soft-drink cans and mass-loaded rods: Analogous homework problems from acoustic and mechanical domains.

The Journal of the Acoustical Society of America·2026
Same journal

Erratum: Statistical wave field theory: Anisotropic wave fields under Neumann's boundary condition [J. Acoust. Soc. Am. 159(3), 2265-2280 (2026)].

The Journal of the Acoustical Society of America·2026
Same journal

On the modification of tip leakage noise sources by porous treatment.

The Journal of the Acoustical Society of America·2026
Same journal

An educational opportunity: Acoustics in an empty room.

The Journal of the Acoustical Society of America·2026
See all related articles

Auditory perception of amplitude modulation (AM) is limited by both external signal variability and internal auditory system resolution. These factors influence AM detection and discrimination performance across various conditions.

Area of Science:

  • Auditory perception
  • Psychoacoustics
  • Signal processing

Background:

  • Understanding auditory perception of amplitude modulation (AM) is crucial for explaining how the auditory system processes complex sounds.
  • Distinguishing between external signal characteristics and internal system limitations is key to modeling auditory performance.
  • Previous research has explored AM detection and discrimination, but the interplay of signal variability and internal noise requires further investigation.

Purpose of the Study:

  • To investigate the relative contributions of external signal variability and internal auditory system resolution to AM detection and discrimination.
  • To determine how different carrier types (pure-tone, broadband noise, frozen noise) and modulation frequencies affect AM perception thresholds.
  • To evaluate the role of masker variability and memory in AM masking paradigms and compare empirical results with modulation-filterbank models.

Related Experiment Videos

Main Methods:

  • Conducted three experiments measuring AM-depth discrimination and detection thresholds using various carrier types and bandwidths.
  • Manipulated signal variability (frozen vs. random noise) and masker characteristics in controlled auditory experiments.
  • Utilized modulation-filterbank models to predict and interpret empirical findings on AM perception.

Main Results:

  • AM-depth discrimination thresholds were dependent on the standard AM depth, especially for pure-tone carriers.
  • AM detection thresholds were generally higher for random-noise carriers compared to frozen-noise carriers.
  • Modulation-filterbank model predictions indicated that both external signal variability and internal noise limit AM perception.

Conclusions:

  • Auditory AM detection and discrimination are constrained by a combination of external signal factors and internal auditory processing limitations.
  • Signal variability, particularly in the carrier type, significantly impacts AM perception thresholds.
  • The findings support the notion that internal noise, akin to a Weber fraction, plays a critical role in the resolution limits of the auditory system for AM processing.