Development of a temporal fundamental frequency coding strategy for cochlear implants

A sound-coding strategy for users of cochlear implants, named enhanced-envelope-encoded tone (eTone), was developed to improve coding of fundamental frequency (F0) in the temporal envelopes of the electrical stimulus signals. It is based on the advanced combinational encoder (ACE) strategy and inclu...

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Bibliographic Details
Published in:The Journal of the Acoustical Society of America 2011-06, Vol.129 (6), p.4023-4036
Main Authors: Vandali, Andrew E., van Hoesel, Richard J. M.
Format: Article
Language:English
Subjects:
Acoustic Stimulation
Auditory Threshold
Biological and medical sciences
Cochlear Implantation - instrumentation
Cochlear Implants
Correction of Hearing Impairment - psychology
Diseases of the ear
Electric Stimulation
Ent and stomatology
Female
Humans
Male
Medical sciences
Models, Theoretical
Noise - adverse effects
Perceptual Masking
Persons With Hearing Impairments - psychology
Persons With Hearing Impairments - rehabilitation
Prosthesis Design
Radiotherapy. Instrumental treatment. Physiotherapy. Reeducation. Rehabilitation, orthophony, crenotherapy. Diet therapy and various other treatments (general aspects)
Signal Processing, Computer-Assisted
Speech Perception
Time Factors
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Summary:A sound-coding strategy for users of cochlear implants, named enhanced-envelope-encoded tone (eTone), was developed to improve coding of fundamental frequency (F0) in the temporal envelopes of the electrical stimulus signals. It is based on the advanced combinational encoder (ACE) strategy and includes additional processing that explicitly applies F0 modulation to channel envelope signals that contain harmonics of prominent complex tones. Channels that contain only inharmonic signals retain envelopes normally produced by ACE. The strategy incorporates an F0 estimator to determine the frequency of modulation and a harmonic probability estimator to control the amount of modulation enhancement applied to each channel. The F0 estimator was designed to provide an accurate estimate of F0 with minimal processing lag and robustness to the effects of competing noise. Error rates for the F0 estimator and accuracy of the harmonic probability estimator were compared with previous approaches and outcomes demonstrated that the strategy operates effectively across a range of signals and conditions that are relevant to cochlear implant users.
ISSN:0001-4966
1520-8524
DOI:10.1121/1.3573988