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A low-power asynchronous interleaved sampling algorithm for cochlear implants that encodes envelope and phase

Ji-Jon Sit1, Andrea M Simonson, Andrew J Oxenham

  • 1Massachusetts Institute of Technology (MIT), Cambridge, MA 02139, USA.

IEEE Transactions on Bio-Medical Engineering
|January 31, 2007
PubMed
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A new asynchronous interleaved sampling (AIS) algorithm for cochlear implants encodes phase information, improving music and speech perception in noise. This bio-inspired strategy also reduces power consumption.

Area of Science:

  • Bio-inspired signal processing
  • Auditory neurostimulation

Background:

  • Cochlear implants struggle to transmit phase information, crucial for complex auditory perception.
  • Current strategies like continuous interleaved sampling (CIS) do not effectively encode phase data.

Purpose of the Study:

  • To introduce a novel asynchronous interleaved sampling (AIS) algorithm.
  • To encode both envelope and phase information for cochlear implant users.
  • To enhance auditory perception and reduce power consumption in cochlear implants.

Main Methods:

  • Developed a bio-inspired asynchronous interleaved sampling (AIS) algorithm.
  • Ensured interleaved-firing by stimulating one electrode at a time.
  • Mimicked natural neural firing patterns with pseudostochastic interspike intervals (1-4 ms).

Related Experiment Videos

  • Prioritized stronger channels while proportionally stimulating weaker channels.

    • Main Results:

    • AIS reconstructions showed significantly higher correlations with original sounds compared to envelope-only methods.
    • Perceptual tests demonstrated improved melody recognition and speech intelligibility in noise.
    • The AIS strategy resulted in lower stimulation rates, potentially saving power.

    Conclusions:

    • The AIS algorithm effectively encodes phase information, surpassing traditional envelope-based methods.
    • AIS offers a promising approach to improve cochlear implant performance for users.
    • This strategy may lead to enhanced hearing capabilities and reduced device power usage.