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Related Concept Videos

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Auditory pathways constitute the complex neural circuits responsible for transmitting and interpreting auditory information from the peripheral auditory system to the brain. Sound waves are initially captured by the outer ear, funneled through the ear canal, and reach the tympanic membrane (eardrum). These vibrations are transmitted via the middle ear's ossicles to the inner ear's cochlea.
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The auditory system is essential for sound perception, utilizing various critical structures. When sound waves enter the outer ear, they travel through the ear canal and cause the eardrum to vibrate. These vibrations are then transmitted to the middle ear, where three tiny bones – the malleus, incus, and stapes – amplify the sound. This amplification is crucial, as it ensures that the sound vibrations are strong enough to be conveyed to the inner ear. These vibrations then reach the...
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The cochlea is a coiled structure in the inner ear that contains hair cells—the sensory receptors of the auditory system. Sound waves are transmitted to the cochlea by small bones attached to the eardrum called the ossicles, which vibrate the oval window that leads to the inner ear. This causes fluid in the chambers of the cochlea to move, vibrating the basilar membrane.
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Consider two sources of sound, that may or may not be in phase, emitting waves at a single frequency, and consider the frequencies to be the same.
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In-channel cancellation: A model of early auditory processing.

Alain de Cheveigné1

  • 1Laboratoire des Systèmes Perceptifs, Unité Mixte de Recherche 8248, Centre National de la Recherche Scientifique, Paris, France.

The Journal of the Acoustical Society of America
|June 17, 2023
PubMed
Summary
This summary is machine-generated.

This study introduces a new auditory processing model using cancellation filters to separate sound sources. This model explains why detecting noise masked by a tone is easier than detecting a tone masked by noise.

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Area of Science:

  • Auditory Neuroscience
  • Signal Processing
  • Psychoacoustics

Background:

  • Early auditory processing involves complex mechanisms for separating sound sources.
  • Understanding auditory masking is crucial for explaining perceptual phenomena.

Purpose of the Study:

  • To propose a novel model of early auditory processing based on cancellation filters.
  • To explain the auditory masking asymmetry between pure tones and narrowband noise using this model.

Main Methods:

  • A delay-and-subtract cancellation filter model is proposed for peripheral auditory channels.
  • The model independently tunes each channel for minimum power.
  • The model's application to the pure tone-noise masking asymmetry is demonstrated.

Main Results:

  • Optimal filter delay corresponds to the period of pure tones or the fundamental period of complex tones.
  • Each channel is split into a cancellation-filtered subchannel and an unfiltered subchannel.
  • The model successfully accounts for the observed masking asymmetry.

Conclusions:

  • The proposed cancellation filter model provides a unified framework for early auditory processing.
  • This model aligns with broader theories of sensory evidence processing and Bayesian inference.
  • The model offers insights into how the auditory system achieves invariance to competing sound sources.