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All fields Title Creator / Publisher Keyword Year AND OR AND NOT All fields Title Creator / Publisher Keyword Year AND OR AND NOT All fields Title Creator / Publisher Keyword Year AND OR AND NOT All fields Title Creator / Publisher Keyword Year AND OR AND NOT All fields Title Creator / Publisher Keyword Year Sort by creator [A → Z]' creator [Z → A]' publishing year ↑ (asc)' publishing year ↓ (desc)' title [A → Z]' title [Z → A]' Simple Search Hits 1 – 10 of 10 1 Optimisation of rate-pitch perception in cochlear implant hearing Vandali, Andrew E.. - 2013 BASE Show details 2 Optimization of rate-pitch in cochlear implant hearing van Hoesel, Richard J. M.; Vandali, Andrew E.; Cowan, Robert; Sly, David In: 2011 Conference on Implantable Auditory Prostheses, Pacific Grove, California, United States, 24-29 July 2011 (2011) Abstract: It has been well established that changes in pulse rate of an electrical pulse train can be used to elicit different percepts of pitch for rates up to approximately 300 Hz. Furthermore it has been shown that the relationship between pulse rate and pitch in cochlear implants (CIs) is consistent with that between fundamental frequency (F0) and musical pitch intervals for normal hearing. However, most current commercial CI sound coding strategies do not utilise pulse rate per se to encode information about F0. Instead they employ a higher stimulation rate to carry F0 information in the amplitude envelope of the stimulus signal. While earlier strategies did employ stimulation rates corresponding to F0, their lower overall pulse rate was shown to be partly responsible for reduced transmission of spectral and temporal envelope information in speech compared to more modern higher-rate strategies. Given that recognition of speech is most important to CI users, moderate-to-high stimulation rates are therefore preferable. Unfortunately F0 information is not very well represented in the envelope of current (vocoder-based) strategies and as a consequence pitch information is poorly perceived. A number of experimental strategies have been proposed that enhance coding of temporal cues to F0 by effectively expanding the depth of F0 modulation within channels and minimising any differences in modulation phase across channels. These strategies have been shown to provide significantly better pitch discrimination as compared to clinical strategies, although performance is still below that of listeners with normal hearing. In addition, for some of these strategies the processing degraded aspects of speech perception compared to clinical strategies. To address this, a new strategy, referred to as eTone, has been developed, which modulates channel envelope signals at an estimated F0 rate, using a sharp-onset, rapid-decay, modulation function. That function was chosen to provide a salient and accurate representation of F0 in the auditory nerve because firing is expected to arise predominantly in response to the first pulse in each F0 interval. In addition, the modulation depth was chosen to promote a salient rate pitch percept without introducing an excessive reduction in channel loudness that can result when applying deep modulation. To optimise performance with this strategy, the effects of modulation shape and depth on pitch salience, pitch height, and loudness are currently being investigated, and will be discussed. The results will lead to improved methods of enhancing rate-pitch salience and accuracy whilst maintaining satisfactory coding of loudness and speech information. URL: http://hdl.handle.net/1959.3/430201 BASE Hide details 3 A fundamental frequency estimator for the real-time processing of musical sounds for cochlear implants McDermott, Hugh J.; Zakis, Justin A.; Vandali, Andrew E. In: Speech communication. - Amsterdam [u.a.] : Elsevier 49 (2007) 2, 113-122 BLLDB OLC Linguistik Show details 4 Speech recognition with the advanced combination encoder and transient emphasis spectral maxima strategies in nucleus 24 recipients Skinner, Margaret W.; Holden, Timothy A.; Fourakis, Marios S.... In: Journal of speech, language, and hearing research. - Rockville, Md. : American Speech-Language-Hearing Association 48 (2005) 3, 681-701 BLLDB OLC Linguistik Show details 5 Speech perception as a function of electrical stimulation rate: using the nucleus 24 cochlear implant system Vandali, Andrew E.; Plant, Kerrie L.; Clark, Graeme M.. - 2000 BASE Show details 6 The spectral maxima sound processor: recent findings in speech perception and psychophysics Clark, Graeme M.; McDermott, Hugh J.; McKay, Colette M.. - : Wien, 1994 BASE Show details 7 Speech processing for multichannel cochlear implants: variations of the Spectral Maxima Sound Processor strategy Clark, Graeme M.; McKay, Colette M.; McDermott, Hugh J.. - 1994 BASE Show details 8 Speech processing for cochlear implants: variations of the spectral maxima sound processor Vandali, Andrew E.; McKay, Colette M.; McDermott, Hugh J.. - 1993 BASE Show details 9 A comparison of speech perception of cochlear implantees using the Spectral Maxima Sound Processor (SMSP) and the MSP (Multipeak) processor Vandali, Andrew E.; McDermott, Hugh J.; McKay, Colette M.. - 1992 BASE Show details 10 A new portable sound processor for the University of Melbourne/ Nucleus Limited multielectrode cochlear implant McKay, Colette M.; McDermott, Hugh J.; Vandali, Andrew E.. - 1992 BASE Show details

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