PERCEPTION OF COLORATION IN DIOTIC REVERBERANT NOISE.
Item
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Title
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PERCEPTION OF COLORATION IN DIOTIC REVERBERANT NOISE.
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Identifier
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AAI8409413
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identifier
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8409413
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Creator
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PIERCE, LINDA K.
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Contributor
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Harry Levitt
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Date
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1984
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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 | Physics, Acoustics
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Abstract
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These experiments explored the perception, termed coloration, of the frequency domain characterization of reverberant sound. The beginning premise was that the standard deviation, (sigma), of the room frequency response, H(f), was a good measure of coloration. Using simulated rooms, reverberant noise stimuli were created which differed only in their perceived frequency spectra and not in their perceived temporal characteristics.;Four experiments were run. In two experiments subjects heard pairs of reverberant noises representing different rooms and made difference judgments; data from these experiments were analyzed using multidimensional scaling techniques. It was determined that coloration has both quantity and quality. Both quantity and quality of coloration are derived primarily from the early reflections, i.e., the first 10 msec, of a room's impulse response, h(t).;Quantity of coloration is related to the standard deviation of H(f), but is best described by a model which uses a critical band-like filter to smooth H(f) before calculating the standard deviation, (sigma)(,CB). Quantity of coloration can be manipulated with little variation in coloration quality by varying the reflectivity, (beta), of the surfaces in a given room.;Quality of coloration is a complex pitch-like quality associated with the particular reflections in a room. Differences in quality between rooms were described accurately by calculating the standard deviation of the difference, (sigma)(,CBDIF), between two smoothed room spectra.;In the third experiment, subjects judged quantity of coloration in two tasks, a paired comparison task and an absolute judgment task, and (sigma)(,CB) was substantiated as a measure of quantity of coloration.;In the last experiment, a Thurstone paired comparison task and analysis was used to determine that the range of the coloration quantity continuum is about 5 1/2 jnd's.
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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.
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Program
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Speech and Hearing Sciences
