Effects of modulation wave shape on modulation frequency discrimination with electrical hearing

Amplitude modulations of pulsitile stimulation can be used to convey pitch information to cochlear implant users. One variable in designing cochlear implant speech processors is the choice of modulation waveform used to convey pitch information. Modulation frequency discrimination thresholds were me...

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Bibliographic Details
Published inThe Journal of the Acoustical Society of America Vol. 124; no. 2; p. EL21
Main Author Landsberger, David M
Format Journal Article
LanguageEnglish
Published United States 01.08.2008
Subjects
Acoustic Stimulation
Auditory Threshold
Cochlear Implantation - instrumentation
Cochlear Implants
Discrimination (Psychology)
England
Humans
Pitch Perception
Prosthesis Design
Psychoacoustics
Speech Perception
Victoria
England
Victoria
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Summary:Amplitude modulations of pulsitile stimulation can be used to convey pitch information to cochlear implant users. One variable in designing cochlear implant speech processors is the choice of modulation waveform used to convey pitch information. Modulation frequency discrimination thresholds were measured for 100 Hz modulations with four waveforms (sine, sawtooth, a sharpened sawtooth, and square). Just-noticeable differences (JNDs) were similar for all but the square waveform, which often produced larger JNDs. The results suggest that a sine, sawtooth, and sharpened sawtooth waveforms are likely to provide similar pitch discrimination within a speech processing strategy.
ISSN:1520-8524
DOI:10.1121/1.2947624