Graeme Clark Collection

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Author: Blamey, Peter × End date: 1992 × Start date: 1990 × Type: Conference Paper ×

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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.
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    Speech processing strategies in an electrotactile aid for hearing-impaired adults and children
    Cowan, Robert S. C. ; Blamey, Peter J. ; Sarant, Julia Z. ; Galvin, Karyn L. ; Clark, Graeme M. (Australian Speech Science and Technology Association, 1990)
    An electrotactile speech processor (Tickle Talker) for hearing-impaired children and adults has been developed and tested. Estimates of second format frequency, fundamental frequency and speech amplitude are extracted from the speech input, electrically encoded and presented to the user through eight electrodes located over the digital nerve bundles on the fingers of the non-dominant hand. Clinical results with children and adults confirm that tactually-encoded speech features can be recognized, and combined with input from vision or residual audition to improve recognition of words in isolation or in sentences. Psychophysical testing suggests that alternative encoding strategies using multiple-electrode stimuli are feasible. Preliminary results comparing encoding of consonant voiced/voiceless contrasts with new encoding schemes are discussed.