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In-channel cancellation: A model of early auditory processing
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
Summary
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.
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.
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