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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

An experimental investigation of automated, noninvasive electrocochleography

Cantrell, Pierce Edwin 08 1900 (has links)
No description available.
2

Distortion-product emissions and pure-tone behavioral thresholds.

Harris, Frances Pauline. January 1988 (has links)
Distortion-product emissions (DPEs) are tonal responses that may be detected in the ear canal when the ear is stimulated simultaneously by two tones that are closely spaced in frequency. In experimental animals, DPEs are reduced in amplitude or are eliminated when cochlear function is disrupted. This association has not been investigated in human subjects. This study was designed to investigate the relation of cochlear status, as determined by pure-tone behavioral thresholds, to DPE amplitude in human subjects. Forty men were selected as subjects. Twenty had normal hearing and 20 had high-frequency sensorineural hearing loss. Pure-tone behavioral thresholds were determined using conventional audiometric procedures for eight frequencies from 750 to 8000 Hz. DPEs were generated in the test ear of each subject by stimulating the ear with two tones, f1 and f2. The stimuli were selected to approximate audiometric test frequencies. Responses were detected by a sensitive microphone that was placed in the ear canal and were extracted by spectral analysis. Results of the study indicated that DPE amplitude was associated with pure-tone threshold. When audiometric threshold was ≤10 dB HL, DPEs could be elicited at all test frequencies for 98% of subjects in both groups. Mean maximum emission amplitude ranged from 3 to 13 dB SPL across frequency. When pure-tone threshold was above 50 dB HL, DPEs were absent or were significantly attenuated. DPEs varied in amplitude when audiometric threshold was between these two extremes. The association of DPE amplitude were pure-tone threshold was frequency specific. DPE amplitude was maximal when pure-tone thresholds were ≤10 dB HL and decreased as pure-tone behavioral threshold increased in the same subject. Repetition of the DPE protocol with five subjects from each group during separate test sessions indicated that the results were reliable over time. Results of the study have clinical implications. The technique may have potential as a noninvasive means of monitoring the status of the cochlea in human subjects.
3

Action potentials recorded from the promontory and ear canal simultaneously, with induced middle-ear liquids

Peck, Maryellen Andrea January 1979 (has links)
No description available.
4

THE ANALYSIS OF COMPLEX SOUNDS BY COCHLEAR PATTERNS

Caldwell, William Fleming, 1931- January 1962 (has links)
No description available.
5

Whirler : the gene and its effect on the function of the ear

Rogers, Michael John Christopher January 1996 (has links)
No description available.
6

An examination of the effect of talker familiarity on the sentence recognition skills of cochlear implant users

Barker, Brittan Ann. January 2006 (has links)
Thesis (Ph.D.)--University of Iowa, 2006. / Supervisor: J. Bruce Tomblin. Includes bibliographical references (leaves 92-99).
7

The Use of Auditory Evoked Potentials to Assess Encoding of the Peripheral Auditory System in Hearing-Impaired Listeners

Riggs, William Jason 01 October 2021 (has links)
No description available.
8

Mathematical modelling and electrophysiological monitoring of the regulation of cochlear amplification /

O'Beirne, Greg A. January 2005 (has links)
Thesis (M.Clin.Audiol./Ph.D.)--University of Western Australia, 2005.
9

Design and evaluation of tone-enhanced strategy for cochlear implants in noisy environment.

January 2011 (has links)
Yu, Shing. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2011. / Includes bibliographical references (leaves 87-93). / Abstracts in English and Chinese; includes Chinese. / Abstract --- p.i / Acknowledgement --- p.vi / Chapter 1 --- Introduction --- p.1 / Chapter 1.1 --- Hearing impairment --- p.1 / Chapter 1.2 --- Limitations of existing CI --- p.2 / Chapter 1.3 --- Objectives --- p.3 / Chapter 1.4 --- Thesis Outline --- p.4 / Chapter 2 --- Background --- p.6 / Chapter 2.1 --- Signal Processing in CI --- p.6 / Chapter 2.1.1 --- Continuous Interleaved Sampler (CIS) --- p.7 / Chapter 2.1.2 --- Advanced Combination Encoder (ACE) --- p.12 / Chapter 2.2 --- Tone perception by cochlear implantees --- p.15 / Chapter 2.2.1 --- Pitch and Tone --- p.15 / Chapter 2.2.2 --- Mechanisms of pitch perception by cochlear im- plantees --- p.20 / Chapter 3 --- Tone-enhanced ACE Strategy for CI --- p.23 / Chapter 3.1 --- Basic principles --- p.23 / Chapter 3.2 --- Acoustical simulation with noise excited vocoder --- p.26 / Chapter 3.3 --- Implementation in a real CI system --- p.29 / Chapter 3.3.1 --- Technical details --- p.30 / Chapter 3.3.2 --- Visual comparison --- p.31 / Chapter 4 --- Robust Generation of F0 Trajectory --- p.33 / Chapter 4.1 --- Requirement on the F0 contour --- p.33 / Chapter 4.2 --- Extraction of F0 contour --- p.34 / Chapter 4.3 --- Post-processing of F0 contour --- p.36 / Chapter 4.3.1 --- Removal of octave-jump --- p.36 / Chapter 4.3.2 --- Interpolation --- p.36 / Chapter 4.3.3 --- Prediction --- p.36 / Chapter 4.3.4 --- Smoothing --- p.38 / Chapter 4.4 --- Performance evaluation --- p.38 / Chapter 5 --- Design of Listening Tests --- p.41 / Chapter 5.1 --- Speech Materials --- p.41 / Chapter 5.2 --- Testing modes --- p.43 / Chapter 5.2.1 --- Sound field mode --- p.45 / Chapter 5.2.2 --- Direct stimulation mode --- p.46 / Chapter 5.3 --- Test Interface --- p.47 / Chapter 6 --- Sound-field Tests --- p.49 / Chapter 6.1 --- Materials and Methods --- p.50 / Chapter 6.1.1 --- Subjects --- p.50 / Chapter 6.1.2 --- Signal processing and test stimuli --- p.52 / Chapter 6.1.3 --- Procedures --- p.52 / Chapter 6.2 --- Results --- p.54 / Chapter 6.3 --- Discussion --- p.57 / Chapter 7 --- Evaluation of Tone-enhanced Strategy --- p.59 / Chapter 7.1 --- Materials and Methods --- p.60 / Chapter 7.1.1 --- Subjects --- p.60 / Chapter 7.1.2 --- Signal processing and test stimuli --- p.60 / Chapter 7.1.3 --- Procedures --- p.62 / Chapter 7.2 --- Results --- p.63 / Chapter 7.3 --- Discussion --- p.66 / Chapter 8 --- Use of Automatically Generated F0 Contour --- p.72 / Chapter 8.1 --- Materials and Methods --- p.73 / Chapter 8.2 --- Results --- p.74 / Chapter 8.3 --- Discussion --- p.76 / Chapter 9 --- Conclusions --- p.80 / Chapter A --- LSHK Cantonese Romanization Scheme --- p.85 / Bibliography --- p.87
10

High frequency acoustic reflexes in cochlea-impaired and normal ears

Jones, Karen Elizabeth 01 January 1990 (has links)
The acoustic reflex refers to the contraction of a middle ear muscle in response to sound. The contraction causes a stiffening of the middle ear system and, consequently, the flow of acoustic energy to the cochlea is impeded. By measuring the change in admittance in the auditory system during sound stimulation it is possible to indirectly monitor the middle ear muscle contractions. Such measurements provide useful information regarding the integrity of the auditory system and the location of the auditory pathology.

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