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A versatile system for the generation and the development of speech coding strategies in cochlear implants
N Tönder1, R Hartmann, R Klinke
1Physiologisches Institut III der J.W. Goethe-Universität Frankfurt am Main, Germany.
IEEE Transactions on Bio-Medical Engineering
|June 4, 1998
Summary
A new digital signal processor (DSP32C) system enhances cochlear implant function with 14 channels and preserved acoustic signal structure. It compensates for electrical crosstalk and improves spatial resolution for better hearing outcomes.
Area of Science:
- Biomedical Engineering
- Auditory Neuroscience
- Signal Processing
Background:
- Cochlear implants aim to restore hearing by electrically stimulating the auditory nerve.
- Existing systems face challenges with channel limitations, signal distortion, and electrical crosstalk.
- Optimizing stimulation strategies is crucial for improving speech perception and sound quality.
Purpose of the Study:
- To develop an advanced signal processor-based stimulation system for cochlear implants.
- To enhance the capabilities of cochlear implant technology by incorporating novel features.
- To improve the fidelity of sound processing and electrical stimulation for better auditory rehabilitation.
Main Methods:
- Development of a Digital Signal Processor (DSP32C) based stimulation system.
- Implementation of up to 14 stimulation channels utilizing the place principle.
- Conservation of acoustic signal time structure via the periodicity principle.
- Integration of compressed analogue and pulsatile stimulation modes.
- Compensation for electrical crosstalk and application of lateral inhibition strategies.
- Inclusion of an interface for generating Continuous Interleaved Sampling (CIS) strategies at high pulse rates.
Main Results:
- The developed system supports up to 14 stimulation channels and preserves acoustic signal periodicity.
- Flexible stimulation modes (compressed analogue, pulsatile, or combined) are achievable.
- Electrical crosstalk is effectively compensated, and lateral inhibition enhances spatial resolution.
- The system supports high-rate CIS strategies (up to 11,000 pulses/s per channel).
Conclusions:
- The DSP32C system offers a significant advancement in cochlear implant technology.
- The system's features provide greater flexibility and improved performance in sound encoding.
- This technology has the potential to enhance speech understanding and sound quality for cochlear implant users.