Graeme Clark Collection

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End date: 1995 × Type: Journal Article × Subject: Speak ×

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    Implant designs for future coding strategies
    Patrick, J. F. ; Evans, A. R. ( 1995)
    This paper briefly describes the history of speech processing developments leading to the presently available Speak processing strategy. The similarities and differences of the Speak and Continuous Interleaved Sampling (CIS) strategies are then discussed and some recent key experimental observations are examined as a guide to potential future coding strategies. Key issues for future coding strategies and implant designs are the number of electrodes and stimulation rates in use. Consideration of these issues has led to development of a prototype implant to be used for advanced speech-processing research.
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    Architecture of the Spectra 22 speech processor
    Seligman, P. ; MCDERMOTT, H. ( 1995)
    The Spectra 22 is a logical extension in the development of the speech processing for the Cochlear Mini 22 system. It can implement the new coding strategy (Speak) that has provided significant improvement in patient benefit.
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    Speech perception in children using the advanced Speak speech-processing strategy
    Cowan, R. S. C. ; Brown, C. ; Whitford, L. A. ; Galvin, K. L. ; Sarant, J. Z. ; Barker, E. J. ; Shaw, S. ; King, A. ; Skok, M. ; Seligman, P. M. ; Dowell, R. C. ; Everingham, C. ; Gibson, W. P. R. ; Clark, Graeme M. ( 1995)
    The Speak speech-processing strategy, developed by the University of Melbourne and commercialized by Cochlear Pty Limited for use in the new Spectra 22 speech processor, has been shown to provide improved speech perception for adults in both quiet and noisy situations. The present study evaluated the ability of children experienced in the use of the Multipeak (Mpeak) speech-processing strategy (implemented in the Nucleus Minisystem-22 cochlear implant) to adapt to and benefit from the advanced Speak speech-processing strategy (implemented in the Nucleus Spectra 22 speech processor). Twelve children were assessed using Mpeak and Speak over a period of 8 months. All of the children had over 1 year's previous experience with Mpeak, and all were able to score significantly on open-set word and sentence tests using the cochlear implant alone. Children were assessed with both live-voice and recorded speech materials, including Consonant-Nucleus-Consonant monosyllabic words and Speech Intelligibility Test sentences. Assessments were made in both quiet and in noise. Assessments were made at 3-week intervals to investigate the ability of the children to adapt to the new speech-processing strategy. For most of the children, a significant advantage was evident when using the Speak strategy as compared with Mpeak. For 4 of the children, there was no decrement in speech perception scores immediately following fitting with Speak. Eight of the children showed a small (10% to 20%) decrement in speech perception scores for between 3 and 6 weeks following the changeover to Speak. After 24 weeks' experience with Speak, 11 of the children had shown a steady increase in speech perception scores, with final Speak scores higher than for Mpeak. Only 1 child showed a significant decrement in speech perception with Speak, which did not recover to original Mpeak levels.