Graeme Clark Collection

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Author: Blamey, Peter × End date: 1993 × Start date: 1990 × Subject: cochlear implants × Subject: otolaryngology × Subject: otology ×

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    Comparison of current speech coding strategies
    Whitford, L. A. ; Seligman, P. M. ; Blamey, Peter J. ; McDermott, H. J. ; Patrick, J. F. ( 1993)
    This paper reports on two studies carried out at the University of Melbourne jointly with Cochlear Pty Ltd. The studies demonstrated substantial speech perception improvements over the current Multipeak strategy in background noise.
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    Fricative perception by cochlear implant users
    Blamey, P. J. ; Tartter, V. C. ( 1992)
    Three implant users were tested with 45 syllables consisting of[v, f, �, ?, z, s, ?, ?, d?, t ?, ?, , d, n, 1] before the vowels [I ,a,u] with three wearable speech processors. The WSP3 processor coded first and second formant frequencies and amplitudes. The MSP1 processor used a similar scheme with improved measurement and coding of the formants. The MSP2 processor added amplitude information from three higher frequency bands. Average scores were 42% for WSP3, 54% for MSP1, and 57% for MSP2. Perception of voicing, manner, and place of articulation of the consonants was significantly greater for the MSP processors than the WSP3 processor. Place perception was slightly higher for MSP2 than MSP1. The listeners used three perceptual dimensions which were highly correlated with the frequencies and amplitudes of peaks in the low frequency region of the frication spectrum, amplitudes of high frequency peaks, and duration of the frication noise.