Graeme Clark Collection

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Author: Seligman, Peter × End date: 1994 × Start date: 1994 × Subject: cochlear implant ×

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    The evolution continues: the clinical trials of the SPEAK strategy in Nucleus 22 channel cochlear implant users [Abstract]
    Antognelli, Trisha ; Whitford, Lesley ; SELIGMAN, PETER ; Everingham, Colleen ; Skok, Marisa ; Plant, Kerrie ; Hollow, Rod ; Staller, Steve ( 1994)
    Research in the field of cochlear implants continues in centres around the world. The aim of all centres is to improve the speech perception abilities of those children and adults fitted with a cochlear implant. Most recently the work of Hugh McDermott and Colette McKay (Melbourne University, Department of Otolaryngology) in developing and researching the SMSP (Spectral Maxima Sound Processor) has greatly enhanced the speech understanding abilities of a number of subjects implanted with the Nucleus 22 Channel Cochlear Implant.
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    Evaluation of a new Spectral Peak coding strategy for the Nucleus 22 channel cochlear implant system
    Skinner, Margaret W. ; Clark, Graeme M. ; Whitford, Lesley A. ; Seligman, Peter M. ; Staller, Steven J. ; Shipp, David B. ; Shallop, Jon K. ; Everingham, Colleen ; Menapace, Christine M. ; Arndt, Patti L. ; Antogenelli, Trisha ; Brimacombe, Judith A. ; Pijl, Sipke ; Daniels, Paulette ; George, Catherine R. ; McDermott, Hugh J. ; Beiter, Anne L. ( 1994)
    Sixty-three postlinguistically deaf adults from four English-speaking countries participated in a 17-week field study of performance with a new speech coding strategy, Spectral Peak (SPEAK), and the most widely used strategy, Multipeak (MPEAK), both of which are implemented on wearable speech processors of the Nucleus 22 Channel Cochlear Implant System; MPEAK is a feature-extraction strategy, whereas SPEAK is a filterbank strategy. Subjects' performance was evaluated with an experimental design in which use of each strategy was reversed and replicated (ABAB). Average scores for speech tests presented sound-only at 70 dB SPL were higher with the SPEAK strategy than with the MPEAK strategy. For tests in quiet, mean scores for medial vowels were 74.8 percent versus 70.1 percent; for medial consonants, 68.6 percent versus 56.6 percent; for monosyllabic words, 33.8 percent versus 24.6 percent; and for sentences, 77.5 percent versus 67.4 percent. For tests in noise, mean scores for Four-Choice Spondees at +10 and +5 dB signal-to-noise ratio (S/N) were 88.5 percent versus 73.6 percent and 80.1 percent versus 62.3 percent, respectively; and for sentences at +15 dB, +10, and +5 dB S/N, 66.5 percent versus 43.4 percent, 61.5 percent versus 37.1 percent, and 60.4 percent versus 31.7 percent, respectively. Subjects showed marked improvement in recognition of sentences in noise with the new SPEAK filterbank strategy. These results agree closely with subjects' responses to a questionnaire on which approximately 80 percent reported they heard best with the SPEAK strategy for everyday listening situations.
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    Formant-based processing for hearing aids
    Blamey, P. J. ; Dooley, G. J. ; Seligman, P. M. ; Alcantara, J. I. ; Gerin, E. S. ( 1994)
    A body-worn hearing aid has been developed with the ability to estimate formant frequencies and amplitudes in real time. These parameters can be used to enhance the output signal by "sharpening" the formant peaks, by "mapping" the amplitudes of the formants onto the available dynamic range of hearing at each frequency, or by resynthesizing a speech signal that is suited to the listener�s hearing characteristics. Initial evaluations have indicated small improvements in speech perception for three groups of subjects: users of a combined cochlear implant and speech processing hearing aid, normally hearing listeners in background noise, and a hearing aid user with a severe hearing loss.