An Enhanced Channel Model for Spectrotemporal Integration and Masker Phase Effects

Bibliographic Details
Main Author:	Oh, Yonghee
Language:	English
Published:	The Ohio State University / OhioLINK 2013
Subjects:	Audiology Electrical Engineering Auditory signal processing multi-channel model psychoacoustics
Online Access:	http://rave.ohiolink.edu/etdc/view?acc_num=osu1376929998

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spelling	ndltd-OhioLink-oai-etd.ohiolink.edu-osu13769299982021-08-03T06:19:24Z An Enhanced Channel Model for Spectrotemporal Integration and Masker Phase Effects Oh, Yonghee Audiology Electrical Engineering Auditory signal processing multi-channel model psychoacoustics Model-based interpretation has always been a special feature of hearing research. Specifically, filter-based model approaches have been applied widely for understanding psychophysical phenomena. In this study, representative integration-based models, specifically focused on statistical properties of the auditory periphery were reviewed (e.g., the Multi-channel model). Then an enhanced channel model (Oh et al., 2012) was proposed by considering the limitations of previous channel models. These include the nonlinearity of cochlear mechanics and an optimum nonlinear detection criterion. Briefly, a single time frame of the model consists of three stages. In response to an input stimulus, the output of the nonlinear filterbank leads to a weight matrix which reflects signal correlation across frequency channels. Each channel is then degraded by both an internal noise representing noise in each channel, and a common noise related to interchannel correlation among the auditory channels. For optimal performance of the system, ideal central processing is approximated by a linear-quadratic detector. Finally, successive time-frame units are accumulated over time. Behavioral experiments were designed to evaluate the proposed model’s ability to predict threshold improvements in spectral and temporal integration studies. The experimental results of these integration studies showed that the improvement in threshold for each integration condition exhibit different detection patterns (i.e., a linear detection scheme for spectral integration; nonlinear asymptotic properties for temporal and spectrotemporal integration). Further, the addition of background noise to each experimental condition produced steeper integration patterns. The enhanced channel model was used to explain these integration effects using a single, unified model. In order to demonstrate model performance with more complex stimuli, temporally varying harmonic complex signals, proposed by Schroeder (1970), were used to account for phase effects in peripheral masking. The masking period patterns (MPPs) for the Schroeder-phase masker study showed that the spectrotemporal configuration of harmonic complex maskers influences masking effectiveness. The overall results indicated that the amount of masking depends on both masker and probe signal properties: signal levels, temporal synchrony, and primarily the harmonic components surrounding the frequency of the probe signal. Predictions by the enhanced channel model provide a very good approximation of listener detection performance in these Schroeder-phase masking experiments. 2013 English text The Ohio State University / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=osu1376929998 http://rave.ohiolink.edu/etdc/view?acc_num=osu1376929998 unrestricted This thesis or dissertation is protected by copyright: some rights reserved. It is licensed for use under a Creative Commons license. Specific terms and permissions are available from this document's record in the OhioLINK ETD Center.
collection	NDLTD
language	English
sources	NDLTD
topic	Audiology Electrical Engineering Auditory signal processing multi-channel model psychoacoustics
spellingShingle	Audiology Electrical Engineering Auditory signal processing multi-channel model psychoacoustics Oh, Yonghee An Enhanced Channel Model for Spectrotemporal Integration and Masker Phase Effects
author	Oh, Yonghee
author_facet	Oh, Yonghee
author_sort	Oh, Yonghee
title	An Enhanced Channel Model for Spectrotemporal Integration and Masker Phase Effects
title_short	An Enhanced Channel Model for Spectrotemporal Integration and Masker Phase Effects
title_full	An Enhanced Channel Model for Spectrotemporal Integration and Masker Phase Effects
title_fullStr	An Enhanced Channel Model for Spectrotemporal Integration and Masker Phase Effects
title_full_unstemmed	An Enhanced Channel Model for Spectrotemporal Integration and Masker Phase Effects
title_sort	enhanced channel model for spectrotemporal integration and masker phase effects
publisher	The Ohio State University / OhioLINK
publishDate	2013
url	http://rave.ohiolink.edu/etdc/view?acc_num=osu1376929998
work_keys_str_mv	AT ohyonghee anenhancedchannelmodelforspectrotemporalintegrationandmaskerphaseeffects AT ohyonghee enhancedchannelmodelforspectrotemporalintegrationandmaskerphaseeffects
_version_	1719434686783029248

An Enhanced Channel Model for Spectrotemporal Integration and Masker Phase Effects

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