Rxivist logo

Rxivist combines preprints from bioRxiv with data from Twitter to help you find the papers being discussed in your field. Currently indexing 64,998 bioRxiv papers from 288,069 authors.

An Analysis of Cochlear Implant Distortion from a User's Perspective

By Barry D. Jacobson

Posted 06 Mar 2014
bioRxiv DOI: 10.1101/003244

We describe our first-hand experience with a cochlear implant (CI), being both a recent recipient and a hearing researcher. We note the promising loudness, but very unpleasant distortion, which makes understanding speech difficult in many environments, including in noise, on the phone or through the radio. We also discuss the extreme unpleasantness of music, which makes recognizing familiar melodies very difficult. We investigate the causes of the above problems through mathematical analysis and computer simulations of sound mixtures, and find that surprisingly, the culprit appears to be non-biological in origin, but primarily due to the envelope-based signal processing algorithms currently used. This distortion is generated before the signal even enters the cochlea. Hence, the long-held belief that inter-electrode interference or current spreading is the cause, appears incorrect. We explain that envelope processing may have been originally instituted based on an inaccurate understanding of the role of place coding vs. temporal coding, or alternatively, because of an incorrect analogy to radio modulation theory. On the basis of our analysis, we suggest immediate concrete steps, some possibly in firmware alone, that may lead to a much improved experience.

Download data

  • Downloaded 2,632 times
  • Download rankings, all-time:
    • Site-wide: 1,418 out of 64,998
    • In bioengineering: 19 out of 1,312
  • Year to date:
    • Site-wide: 6,785 out of 64,998
  • Since beginning of last month:
    • Site-wide: 9,107 out of 64,998

Altmetric data

Downloads over time

Distribution of downloads per paper, site-wide

Sign up for the Rxivist weekly newsletter! (Click here for more details.)