Evaluation of a binaural listening system using a monophonic input.
Item
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Title
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Evaluation of a binaural listening system using a monophonic input.
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Identifier
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AAI3047243
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identifier
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3047243
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Creator
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McInerney, Maryrose Hannon.
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Contributor
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Adviser: Harry Levitt
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Date
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2002
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Language
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English
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Publisher
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City University of New York.
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Subject
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Health Sciences, Audiology
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Abstract
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This dissertation evaluated a simulated binaural signal processing system for separating speech from noise using a monophonic input. Sinewave modeling was used to separate the peaks of the speech-plus-noise spectrum from the residual spectral components. Interaural time and/or intensity differences were used to alter the perceived locations of the spectral peaks and the residual spectral components. It was hypothesized that the sound image associated with the spectral peaks, which is heard as speech, would be perceived towards one side of the head while the sound image associated with the residual spectral components, which is heard as noise, would be heard towards the opposite side of the head. It was also hypothesized that the combination of interaural time and intensity differences would produce even greater differences in perceived location than either interaural time or interaural intensity differences alone. An additional hypothesis was that the differences in perceived location would also improve ease of listening.;Ten normal hearing adults were tested under four experimental conditions: Interaural time difference (IT), Interaural intensity difference (II), Interaural time and intensity difference (ITI) and no processing (NP). There were 4 replications for each of 4 speech-to-noise ratios (2dB, 0dB, -2dB, -4dB) for a total of 64 trials per subject. Judgments were made of the perceived locations of the speech and noise images, spatial diffuseness of the speech image and ease of listening of the speech image.;Results supported the hypothesis regarding the effect of signal processing on the perceived location of the speech and noise. The magnitude of the effect was greater for the ITI condition than for either the IT or II conditions. An unexpected finding was that the processing technique had a greater effect on the perceived location of the noise than on the perceived location of the speech. Speech-to-noise ratio did not have a significant effect on the changes in perceived location produced by the processing technique. The processing technique also did not have a significant effect on the ratings of spatial diffuseness of the speech image or on the ratings of ease of listening.
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Type
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dissertation
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Source
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PQT Legacy CUNY.xlsx
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degree
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Ph.D.
