Combination and Comparison of Sound Coding Strategies Using Cochlear Implant Simulation with Mandarin Speech

Enoch Hsin Ho Huang, Chao Min Wu, Hung Ching Lin

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


Three cochlear implant (CI) sound coding strategies were combined in the same signal processing path and compared for speech intelligibility with vocoded Mandarin sentences. The three CI coding strategies, biologically-inspired hearing aid algorithm (BioAid), envelope enhancement (EE), and fundamental frequency modulation (F0mod), were combined with the advanced combination encoder (ACE) strategy. Hence, four singular coding strategies and four combinational coding strategies were derived. Mandarin sentences with speech-shape noise were processed using these coding strategies. Speech understanding of vocoded Mandarin sentences was evaluated using short-time objective intelligibility (STOI) and subjective sentence recognition tests with normal-hearing listeners. For signal-to-noise ratios at 5 dB or above, the EE strategy had slightly higher average scores in both STOI and listening tests compared to ACE. The addition of EE to BioAid slightly increased the mean scores for BioAid+EE, which was the combination strategy with the highest scores in both objective and subjective speech intelligibility. The benefits of BioAid, F0mod, and the four combinational coding strategies were not observed in CI simulation. The findings of this study may be useful for the future design of coding strategies and related studies with Mandarin.

Original languageEnglish
Pages (from-to)2407-2416
Number of pages10
JournalIEEE Transactions on Neural Systems and Rehabilitation Engineering
StatePublished - 2021


  • Cochlear implant
  • Mandarin
  • combinational sound coding strategy
  • speech intelligibility
  • vocoder


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