Speech processing in vocoder-centric cochlear implants

By Philip Loizou

Abstract:

The principles of most recent cochlear implant processor are similar to that of
the channel vocoder, originally used for transmitting speech over telephone
lines with much less bandwidth than that required for transmitting the
unprocessed speech signal. An overview of the various vocoder-centric
processing strategies proposed for cochlear implants since the late 1990s is
provided including the strategies used in different commercially available
implant processors. Special emphasis is placed on reviewing the strategies
designed to enhance pitch information for potentially better music perception.
The various noise suppression strategies proposed over the years based on
multi-microphone and single-microphone inputs are also described.

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