Graeme Clark Collection

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Author: Clark, Graeme × End date: 1999 × Start date: 1990 × Type: Journal Article × Subject: cochlear implant × Subject: otolaryngology × Subject: speech processing ×

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    Speech results with a bilateral multi-channel cochlear implant subject for spatially separated signal and noise
    van Hoesel, Richard J. M. ; Clark, Graeme M. ( 1999)
    Speech tests in noise were administered to a bilaterally implanted cochlear implant subject. Performance for simultaneous use of two identical implants, with the same speech processing strategy on two independent standard clinical processors, was compared with that of the better performing monaural side alone. Speech was presented at an angle of 45 degrees toward one ear, with noise at 45 degrees toward the contralateral side. Tests were also administered for speech and noise reversed in location. When the speech signal was on the same side as the subject's better performing ear, monaural and binaural tests resulted in similar scores. When the speech was on the opposite side, however, the binaural condition showed significantly better speech scores. The results indicate that binaural implants can provide improved performance in noise when speech and noise arc spatially separated.
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    Comparison of the SPEAK (Spectral Maxima) and multipeak speech processing strategies and improved speech perception in background noise
    Clark, Graeme M. ; Whitford, L. ; Van Hoesel, R. ; McKay, C. M. ; McDermott, H. D. ; Seligman, P. ; Vandali, A. ; Pyman, B. C. ; Cowan, R. C. ( 1995)
    As more is known about speech processing for Cochlear Implant patients, results should continue to improve. It now appears possible that Cochlear Implant patients may, in some instances, reach performance levels that are better than those obtained by most severely deaf people who use hearing aids.
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    The development of the Melbourne/Cochlear multiple-channel cochlear implant for profoundly deaf children
    Clark, Graeme M. ; Busby, Peter A. ; Dowell, Richard C. ; Dawson, Pamella W. ; Pyman, Brian C. ; Webb, Robert L. ; Staller, Steven J. ; Beiter, Anne L. ; Brimacombe, Judith A. ( 1992)
    In 1978-79, a speech processing strategy which extracted the voicing (FO) and second formant (F2) frequencies and presented these as rate and place of stimulation respectively to residual auditory nerve fibres was developed for the University of Melbourne's prototype multiple-channel receiver-stimulator (Clark et aI1977, Clark et a11978, Tong et aI1980). This speech processing strategy was shown to provide post linguistically deaf adults with some open-set speech comprehension using electrical stimulation alone, and considerable help when used in combination with lipreading (Clark et al 1981).
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    Preliminary results with a six spectral maxima speech processor for The University of Melbourne/Nucleus multiple electrode cochlear implant
    McKay, Colette M. ; McDermott, Hugh J. ; VANDALI, ANDREW ; Clark, Graeme M. ( 1991)
    An improved sound processor for a multiple-channel cochlear implant hearing prosthesis has been developed. The spectral maxima sound processor (SMSP) extracts the six largest frequency components of speech and presents stimuli at a rate of 250 Hz to electrodes at positions selected on the basis of the spectral frequencies. It was designed for use initially with the advanced cochlear implant recently developed at the University of Melbourne, which is capable of high rate and quasi-simultaneous stimulation. The present study, however, was carried out with two subjects who have the more widely used 22-electrode implant produced commercially by Cochlear Pty Limited (formerly Nucleus Limited). Preliminary results comparing the performance of the SMSP with that of previous speech processing techniques (F0/F1/F2 strategy) are presented. The results indicate that the SMSP is capable of providing implanters with significantly greater information about speech.