Current Projects‎ > ‎

b. Cochlear Implants Coding

  • Sponsors
          Army Research Office, The Coulter Transitional Fund, The Bloedel Foundation, NIH R01 DC007525, P30 DC004661.
  • People
Les AtlasKaibao Nie,  Xingbo Peng, Tyler Ganter
  • Description
By electrically stimulating the auditory nerve using an array of surgically implanted electrodes, the cochlear implant can allow totally deaf people to approach normal performance on daily sentence recognition in quiet. Despite the great efficacy, there remain significant limitations in cochlear implant performance on tasks including speech recognition in noise, lexical tone discrimination, and music perception. One major factor in these outcomes appears to be the lack of spectral and temporal fine structure information in current cochlear implant signal processing strategies.

Harmonic structure is a common feature for complex sounds, such as those produced by the human voice and musical instrument. Psychoacoustic studies show that the normal auditory system makes good use of harmonic information to perceive pitch, identify instrument timbre, and focus on a target speaker in complex listening situations. As important as it is, how to represent harmonic information in cochlear implants remains unresolved. The key difficulty lies in the inherent coarse spectral and temporal resolution of cochlear implants. Our current research is aimed to improve fine structure coding for cochlear implant listeners by novel signal processing techniques, e.g., coherent demodulation. 
  • Patent
 K. Nie, L. Atlas, J. Rubinstein, X. Li, and P. Clark, “Enhanced signal processing for cochlear implants
 US Patent No. 8019431 B2, Sep 2011.
  • Publications
Xing Li, K. Nie, N. Imennov, J. Rubinstein, & L. Atlas. Improved perception of music with a harmonic based algorithm for cochlear implants. IEEE Transactions on Neural Systems and Rehabilitation Engineering.  pdf
 
Xing Li, K. Nie, N. Imennov, J.H. Won, W. Drennan, J. Rubinstein, & L. Atlas, (2012). Improved perception of speech in noise and Mandarin tones with acoustic simulations of harmonic coding for cochlear implants. Journal of the Acoustical Society of America, in press.  pdf 
 
J.H. Won, C. Lorenzi, K. Nie, Xing Li, E. Jameyson, W. Drennan, & J. Rubinstein, (2012). The ability of cochlear implant users to use temporal envelope cues recovered from speech frequency modulation. Journal of the Acoustical Society of America.  link 
 
Xing Li, K. Nie, N. Imennov, J.H. Won, W. Drennan, L. Atlas, & J. Rubinstein, (2011). Speech and music recognition with acoustic simulations of a harmonic single sideband encoding strategy for cochlear implants. The 161st Meeting of the Acoustical Society of America, Seattle, USA.  link 
 
Xing Li, K. Nie, L. Atlas, & J. Rubinstein, (2010). Harmonic coherent demodulation for improving sound coding in cochlear implants. IEEE Conference on Acoustics Speech and Signal Processing, Dallas, USA.  pdf 
 
K. Nie, Xing Li,  N. Imennov, J.H. Won, W. Drennan, L. Atlas, & J. Rubinstein, (2011). Preliminary results with a harmonic single sideband encoding strategy for improving temporal fine structure coding in cochlear implants. Paper presented at the Conference on Implantable Auditory Prosthesis, Pacific Grove, CA, USA, July 24-29.  
 
K. Nie, Xing Li,  N. Imennov, J.H. Won, W. Drennan, L. Atlas, & J. Rubinstein, (2011). Mandarin tone recognition with a harmonic coding strategy for cochlear implants. Paper presented at the 8th Asia Pacific Symposium on Cochlear Implant and Related Sciences, Daegu, Korea, October 25-28.  
 
K. Nie, Xing Li, L. Atlas, & J. Rubinstein, (2010). Sending better music to the brain via electrical stimulation of the auditory  for cochlear implants. Paper presented at the 11th International Conference on Music Perception and Cognition, Seattle, USA, August 23-26.  
 
K. Nie, Xing Li, L. Atlas, & J. Rubinstein, (2009). Experimental results with a single sideband encoding strategy for cochlear implants. Paper presented at the  Conference on Implantable Auditory Prosthesis, Lake Tahoe, CA, USA, July 12-17.  
 
J. Rubinstein, W. Drennan, K. Nie, J.H. Won, N. Imennov, Xing Li, & L. Atlas, (2009). Spectral and temporal contributions to clinical performance. Paper presented at the Conference on Implantable Auditory Prosthesis, Lake Tahoe, CA, USA, July 12-17.