Development of a temporal fundamental frequency coding strategy for cochlear implants
| Autor: | Andrew E. Vandali, Richard van Hoesel |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
Male
Time Factors Acoustics and Ultrasonics Computer science Acoustics Speech recognition medicine.medical_treatment Prosthesis Design Arts and Humanities (miscellaneous) Cochlear implant medicine Humans Correction of Hearing Impairment Inner ear Cochlea Signal processing Estimator Auditory Threshold Signal Processing Computer-Assisted Natural frequency Fundamental frequency Models Theoretical Cochlear Implantation Electric Stimulation Cochlear Implants Persons With Hearing Impairments medicine.anatomical_structure Acoustic Stimulation Modulation Harmonics Speech Perception Harmonic Female Noise Perceptual Masking Encoder Communication channel |
| Zdroj: | The Journal of the Acoustical Society of America. 129:4023-4036 |
| ISSN: | 0001-4966 |
| DOI: | 10.1121/1.3573988 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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