Speech processing in vocoder-centric cochlear implants.
The principles of the most recent cochlear implant processors 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.
Loizou
Philipos C
PC
Department of Electrical Engineering, Jonsson School of Engineering and Computer Science, University of Texas at Dallas, Richardson, Tex., USA.
D000161:Acoustic Stimulation / Q000295:instrumentation*; D003054:Cochlear Implants / Q000266:history; D003143:Communication Devices for People with Disabilities / Q000266:history; D004566:Electrodes; D004867:Equipment Design; D034381:Hearing Loss / Q000628:therapy*; D049673:History, 20th Century; D006801:Humans; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation; D013067:Speech Perception