Acoustic simulation of cochlear implant hearing
One aim in current cochlear implant (CI) research is to improve and opti- mize speech processing strategies. During the development of new strate- gies acoustic simulations of CI hearing have widely been used for evalua- tion. These models usually take audio signals as input and mimic the effects of CI signal processing. In the present paper a new algorithm of acoustic simulation is presented, which transforms stimulation patterns of any co- chlear implant directly into an audio signal. Therefore it is independent of the CI strategy used for generating the stimulation pattern. Technical aspects like current spread and physiological aspects including loudness perception and phase locking capabilities of the simulated CI listener can be config- ured. The presented algorithm was used to evaluate and compare two differ- ent CI speech processing strategies in terms of speech intelligibility and pitch discrimination. The results show that acoustic simulation can help es- timate the amount of useful information in a CI stimulation pattern and hence be a help in evaluating CI strategies.
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