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New processing strategies for multichannel cochlear prostheses

D T Lawson¹, B S Wilson, C C Finley

¹Neuroscience Program, Research Triangle Institute, Research Triangle Park, Durham, NC 27709.

Progress in Brain Research

|January 1, 1993

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Continuous interleaved sampling (CIS) significantly improved speech recognition in cochlear implant patients compared to compressed analog (CA) and interleaved pulses (IP) strategies. CIS offers superior performance for cochlear implant users.

Area of Science:

Audiology
Biomedical Engineering
Neuroscience

Background:

Cochlear prostheses use various strategies to represent speech.
Previous studies compared compressed analog (CA) and interleaved pulses (IP) strategies.
Continuous interleaved sampling (CIS) is an alternative strategy.

Purpose of the Study:

To compare the effectiveness of CA, IP, and CIS speech processing strategies in multichannel cochlear prostheses.
To evaluate these strategies in subjects with excellent performance using the standard CA processor.

Main Methods:

Tested three strategies (CA, IP, CIS) with one subject.
Tested CA and CIS strategies with six additional subjects.
Utilized closed-set consonant identification and open-set word/sentence recognition tests.

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Main Results:

All subjects achieved their highest scores or 100% with the CIS strategy.
IP strategy scores fell between CA and CIS scores.
CIS demonstrated superior performance across all tested speech recognition tasks.

Conclusions:

The continuous interleaved sampling (CIS) strategy provides superior speech understanding for cochlear implant users compared to CA and IP.
Findings have significant implications for optimizing cochlear implant processor design for better patient outcomes.