Graeme Clark Collection

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http://hdl.handle.net/11343/375

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1986 - 1987 2
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Type: Conference Paper × Subject: otolaryngology × Subject: multiple-channel cochlear implant × Author: Dowell, Richard × Author: Seligman, Peter ×

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    Speech recognition abilities in profoundly deafened adults using the Nucleus 22 Channel Cochlear Implant System
    Brimacombe, J. A. ; Webb, R. L. ; Dowell, R. C. ; Mecklenburg, D. J. ; Beiter, A. L. ; Barker, M. J. ; Clark, Graeme M. ( 1987)
    Research in the area of cochlear prostheses to restore a level of hearing sensation to the profoundly deaf has been ongoing at a number of centers throughout the world since the 1960's. 3, 4, 7, 8,. Work on a multichannel cochlear implant that utilizes a speech feature extraction coding strategy and multi-sited, sequential, bipolar stimulation to enhance pitch perception began at the University of Melbourne under the direction of Professor Graeme Clark in the 1970's. Collaboration with Nucleus Limited, a multi-national biomedical corporation from Australia, led to the development of the current version of the prosthesis. The Nucleus 22 Channel Cochlear Implant System has been described in detail elsewhere. 1, 5
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    A formant-estimating speech processor for cochlear implant patients
    Blamey, P. J. ; Dowell, R. C. ; Brown, A. M. ; Seligman, P. M. ; Clark, Graeme M. (Speech Science and Technology Conference, 1986)
    A simple formant-estimating speech processor has been developed to make use of the "hearing" produced by electrical stimulation of the auditory nerve with a multiple-channel cochlear implant. Thirteen implant patients were trained and evaluated with a processor that presented the second formant frequency, fundamental frequency, and amplitude envelope of the speech. Nine patients were trained and evaluated with a processor that presented the first formant frequency and amplitude as well. The second group performed significantly better in discrimination tasks and word and sentence recognition through hearing alone. The second group also showed a significantly greater improvement when hearing and lipreading was compared with lipreading alone in a speech tracking task.