Journal of Northeastern University Natural Science ›› 2014, Vol. 35 ›› Issue (2): 212-216.DOI: 10.12068/j.issn.1005-3026.2014.02.014

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Auditory Characteristicsbased Speech Coding Strategy in Cochlear Implant

YANG Dan, XU Bin, LI Feng, WANG Xu   

  1. School of Information Science & Engineering, Northeastern University, Shenyang 110819, China.
  • Received:2013-06-09 Revised:2013-06-09 Online:2014-02-15 Published:2013-11-22
  • Contact: YANG Dan
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Abstract: For the limitations of speech coding strategy in cochlear implants, a coding strategy was proposed based on auditory characteristics. For the bandpass filter and envelope detector stage in the proposed strategy, Gammatone filterbanks model and Meddis inner hair cell(IHC)model were used respectively. For channel selection stage, a psychoacoustic masking effects model was used. The strategy using MATLAB was simulated,and 8of22 channel coding strategy was realized. The results showed the proposed strategy had more stability and robustness than other strategies, such as CIS (continuous interleaved sampling)and ACE (advanced combination encoder).

Key words: speech coding strategy, Gammatone filterbank, Meddis inner hair cell(IHC)model, psychoacoustic, masking effect

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