A comparison of the effects of compression amplification and direct consonant enhancement.
Item
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Title
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A comparison of the effects of compression amplification and direct consonant enhancement.
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Identifier
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AAI3144143
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identifier
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3144143
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Creator
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Sundar, Girija S.
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Contributor
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Adviser: Arlene Neuman
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Date
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2004
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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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Past research has shown that changing the consonant-vowel ratio (CVR) by increasing the consonant level improves speech recognition by persons with hearing loss. Since compression amplification provides an automatic method of increasing CVR, the purpose of this study was to compare the consonant recognition obtained using two-channel syllabic compression to that obtained by increasing consonant level (CE Peak enhancement). A second goal was to examine how the input level to a compression hearing aid would change CV ratio and affect consonant recognition. A comparison of speech recognition scores for the baseline (un-enhanced), compression (65 dB input), and CE Peak conditions revealed no significant difference between the baseline and compression conditions, and small, but significant increases with CE Peak enhancement. An analysis of the CV ratios obtained with compression revealed that often there were large changes in CV ratio characterized by decreases in the level of the vowel in combination with increases in the level of the consonant. The simultaneous change in vowel and consonant levels may be responsible for the poorer recognition with compression than with direct enhancement of only the consonant level. CV ratio increased with increasing input levels. On average, recognition scores increased with increasing input level, but the pattern of performance differed as a function of the consonant.
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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.
