Cochlear implants don't generate sound like a hearing aid would. Instead, they zap your cochlea.

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Sources:
https://www.nidcd.nih.gov/health/hearing-aids
https://www.nidcd.nih.gov/health/cochlear-implants
http://www.npr.org/sections/health-shots/2015/05/18/406838781/deaf-jam-experiencing-music-through-a-cochlear-implant