Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 63 for “"pure tone"”.
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Gender Differences in Auditory Perception of Pure Tone Frequencies and Speech Intelligibility via Bone Conduction Transducers
… hearing processes. The first experiment was a pure tone study where hearing thresholds for six pure tone frequencies and four bone conduction skull locations were measured in 15 male and 15 female participants to determine if gender differences exist in auditory signal detection. As frequency …
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A comparison of pure tone thresholds and distortion product otoacoustic emission measures in patients with Tuberculosis receiving aminoglycosides
Includes bibliographical references (leaves 116-131).
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Computer assisted audiometric evaluation system
… PC/XT/AT compatible personal computer to perform pure tone and speech tests and · comprises a plug-in card and custom software. The card contains pure tone and masking noise generators, together with amplifiers for a. set of headphones .and bone conduction transducer, patient and audiologist …
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Hearing assessment aboard the International Space Station
… before return to earth was compared to standard pure tone audiometric data collected after landing, with the intent to demonstrate that these values were essentially identical, and that data collected onboard the ISS can be interpreted as if it were pure-tone audiometric data. However, …
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The Effect of Masking on the Acoustic Reflex Threshold
… or reflex arc were used in this study. A 1000 Hz tone was used a s t h e pure tone stimulus and narrow</p> <p>band noise centered a t 1000 Hz was used as the masking stimulus. Pure tone thresholds were obtained without masking. The amount of masking necessary to shift the pure tone threshold 30 dB …
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Discriminability of Interaural Time Disparities by Normal Listeners and Listeners With High-Frequency Sensorineural Hearing Loss
… of interaural time-delays using a 500 Hz pure tone, a sinusoidally-amplitude-modulated 4 kHz tone and narrow band noises centered on either 500 Hz or 4 kHz.
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Influential factors in driving confidence among hearing-impaired older adults in Cape Town
… confidence. No association was found between pure-tone average and level of driving confidence or between pure-tone average and driving safety. Further research in this area could assist in advising legislation relating to licensing and road safety campaigns targeted at older adults, as well …
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Hearing Health in Utah Special Olympics Athletes Compared to Special Olympics Athletes Worldwide: A Prevalence Study in Individuals with Intellectual Disabilities
… Winter Games in Nagano, Japan was made. A total pure-tone failure rate of 31.1% among athletes in all four games was found, however follow-up was recommended for 34.7% of athletes. Athletes were found to have a greater prevalence of cerumen management problems than the general population and 34% …
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Dynamic Analysis of Semi-Active Control Techniques for Vehicle Applications
… different base excitations: chirp, step, and pure tone. Corresponding to the chirp input, transmissibilities and auto spectrums are considered for each control policy. Specifically, transmissibilities between the sprung mass displacement and the unsprung mass displacement are generated …
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Inlet swirl distortion effects on the generation and propagation of fan rotor shock noise
… fan model for the prediction of multiple-pure-tone noise generation is developed in this thesis. The model eliminates the need for a full-wheel, three-dimensional unsteady RANS simulation of the fan blade row, allowing Euler calculations to be used to capture the phenomena of interest. The …
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Sensory and Cognitive Declines in Older Adults: A Longitudinal Study
… age-related declines in hearing, as assessed by pure-tone thresholds, begin around age 20 and continue across the lifespan. In another article published from the same cross-sectional dataset, Hale et al.: 2011) found that working memory ability also begins declining around age 20 and continues …
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Frequency-Discrimination Performance of Normal-Hearing and Hearing-Impaired Listeners
… for a variety of signals. These signals included pure tones, fixed-bandwidth (400 Hz) narrow-band noise and ratio-bandwidth (20%) narrow-band noise. Analyses included response factors in frequency discrimination, comparison of the data from the normal-hearing subjects with published data, relation …
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The Audiometric Profile of Young Adults Who Report Difficulty with Speech Perception in Noise
… thresholds (250-8000 Hz), high frequency pure tone thresholds (9000-12,500 Hz), QuickSIN, distortion product otoacoustic emissions (DPOAEs), and auditory brainstem responses (ABR) in 13 participants (5 with reported difficulty in noise & 8 controls). Participants who reported difficulty in …
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Role of Driver Hearing in Commercial Motor Vehicle Operation: An Evaluation of the FHWA Hearing Requirement
… to compare its effectiveness to that of standard pure-tone audiometry. Results indicated that there are truck driving tasks which require the use of hearing, that truck drivers may be suffering permanent hearing loss as a result of driving, that team drivers may be approaching a 100% OSHA noise …
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Methods for robust characterization of consonant perception in hearing-impaired listeners
… aids and/or a cochlear implant, based on their pure-tone threshold and speech perception scores. Although these assistive listening devices do help these individuals communicate in quiet surroundings, many still have difficulty understanding speech in noisy environments. Especially, listeners …
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Neurophysiological bases of frequency discrimination in children with Auditory Processing Disorder or Specific Language Impairment
… potentials were examined using a 1000Hz pure tone base frequency. Typically developing children and children with APD or SLI differed in in their detection of frequency changes: behavioral results were below chance level and the MMN amplitude was smaller in the impaired population. Slight …
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Development and evaluation of a free-field voice test for potential use as a community screening tool for hearing impairment in children
… and loud. This was evaluated against pure tone audiometry for sensitivity, specificity, cost and ease of application in two studies: hospital and school- based. A total of 394 children were tested; 189 in hospital-based study and 205 in school based study. 378 of the total were …
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Effects of NAL-R amplification on consonant speech perception in hearing-impaired listeners
… the presentation level depending on the pure tone thresholds (PTTs) and the long-term average speech spectrum (LTASS ) (Zurek and Delhorne (1987), Posner and Ventry (1977)). The data demonstrated that the MCL approach led to consistent responses in all subjects. Based on these results, a …
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