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Enhancement of temporal periodicity cues in cochlear implants: Effects on prosodic perception and vowel identification

Green, T; Faulkner, A; Rosen, S; Macherey, O; (2005) Enhancement of temporal periodicity cues in cochlear implants: Effects on prosodic perception and vowel identification. J ACOUST SOC AM , 118 (1) 375 - 385. 10.1121/1.1925827.

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Abstract

Standard continuous interleaved sampling processing, and a modified processing strategy designed to enhance temporal cues to voice pitch, were compared on tests of intonation perception, and vowel perception, both in implant users and in acoustic simulations. In standard processing, 400 Hz low-pass envelopes modulated either pulse trains (implant users) or noise carriers (simulations). In the modified strategy, slow-rate envelope modulations, which convey dynamic spectral variation crucial for speech understanding, were extracted by low-pass filtering (32 Hz). In addition, during voiced speech, higher-rate temporal modulation in each channel was provided by 100% amplitude-modulation by a sawtooth-like wave form whose periodicity followed the fundamental frequency (FO) of the input. Channel levels were determined by the product of the lower- and higher-rate modulation components. Both in acoustic simulations and in implant users, the ability to use intonation information to identify sentences as question or statement was significantly better with modified processing. However, while there was no difference in vowel recognition in the acoustic simulation, implant users performed worse with modified processing both in vowel recognition and in formant frequency discrimination. It appears that, while enhancing pitch perception, modified processing harmed the transmission of spectral information. (c) 2005 Acoustical Society of America.

Type: Article
Title: Enhancement of temporal periodicity cues in cochlear implants: Effects on prosodic perception and vowel identification
DOI: 10.1121/1.1925827
Keywords: SOUND PROCESSOR SMSP, ELECTRICAL-STIMULATION, SPEECH RECOGNITION, FUNDAMENTAL-FREQUENCY, AMPLITUDE-MODULATION, PITCH PERCEPTION, TONE PERCEPTION, NORMAL-HEARING, PULSE TRAINS, NOISE
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > Div of Psychology and Lang Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > Div of Psychology and Lang Sciences > Speech, Hearing and Phonetic Sciences
URI: https://discovery.ucl.ac.uk/id/eprint/19334
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