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An account of monaural phase sensitivity
Robert P Carlyon1, Shihab Shamma
1MRC Cognition and Brain Sciences Unit, 15 Chaucer Road, Cambridge CB2 2EF, United Kingdom. bob.carylon@mrc-cbu.cam.ac.uk
The Journal of the Acoustical Society of America
|July 26, 2003
Summary
Listeners can detect sound phase differences across frequencies and within auditory filters. A new model explains this by using spectro-temporal decomposition, preserving across-channel timing information for auditory perception.
Area of Science:
- Auditory Neuroscience
- Psychoacoustics
- Signal Processing
Background:
- Human listeners can perceive phase differences in sound envelopes across different frequencies.
- Sensitivity to phase differences varies based on frequency separation and auditory filter interactions.
Purpose of the Study:
- To propose a novel computational model of auditory processing.
- To account for listener sensitivity to phase differences in various acoustic conditions.
- To integrate across-channel timing information, often neglected in current models.
Main Methods:
- Developed a cochlear model simulating auditory processing.
- Employed spectro-temporal decomposition inspired by auditory cortex neural responses.
- Utilized a distance metric to quantify stimulus discriminability.
Main Results:
- The model accurately predicts human sensitivity to phase differences in complex sounds.
- It successfully models discrimination of amplitude and frequency modulation.
- It accounts for phase discrimination of transient signals (Huffman sequences).
Conclusions:
- The proposed model offers a unified explanation for diverse auditory phase discrimination abilities.
- It highlights the importance of preserving across-channel timing information in auditory models.
- This approach advances our understanding of auditory perception and neural processing.