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This dissertation, Effects of Noise Type on Speech Understanding by H N, Elaine, Ng, 吳凱寧, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of dissertation entitled Effects of Noise Type on Speech Understanding submitted by Elaine H. N. NG for the degree of Master of Science in Audiology at the University of Hong Kong in May 2006 The ultimate goal of the study is to find out how well a speech audiometry, using steady state speech-spectrum shaped background noise, predicts one's speech understanding ability in different real life situations. The real life noise and the steady-state speech spectrum-shaped noise have different characteristics and may affect speech understanding differently in both normal-hearing and hearing-impaired listeners. Subjects comprised of 30 adults with normal hearing and 15 adults with mild to moderate hearing impairment were tested with sentence materials in the Cantonese Hearing in Noise Test (CHINT). The noise conditions included a 4- talker babble, a 6-talker babble, noise from a lower and an upper deck of a bus, a cafe, a Chinese restaurant, a carriage of Mass Transit Railway (MTR) and a street and the steady state speech spectrum-shaped noise in CHINT. Performance-intensity (P-I) functions and the estimated signal-to-noise ratios (SNRs) in predicting 50% correct intelligibility of the sentences in each noise condition for both groups were studied. Results showed that the steady state speech spectrum-shaped noise as used in CHINT test could reasonably predict one's speech intelligibility in many but not all the real life noise conditions. The differences in performance could be attributed to energy allocation of frequency spectrum, fluctuation in temporal waveform and the presence of competing background speech. The preliminary data from the hearing-impaired group could be well fitted into the results for the normal-hearing group in many of the noise conditions except those with temporal modulation or fluctuation. vi DOI: 10.5353/th_b3799015 Subjects: AudiometrySpeech perceptionSpeech processing systems

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