Influence of a shift in frequency distribution and analysis rate on phoneme intelligibility in noisy environments for simulated bilateral cochlear implants

摘要: Abstract A model was developed to simulate acoustically sound perception through a cochlear implant (CI), in order evaluate the effects of spectral shift and analysis rate on speech recognition quiet noise. In current study, we considered two rates, 250 Hz 500 Hz, CI modes: Symmetric Bilateral Cochlear Implant (SBCI) Shifted (ShBCI). Processing coding strategies used this were adapted from Digisonic SP CI, manufactured by Neurelec. Intelligibility signals processed different rates modes assessed group fifty normal-hearing subjects. The simulated varying overlap between successive frames using narrow band vocoder. With SBCI mode, both ears stimulated with same signal (the frequency filters used). ShBCI shifted (between ears). All conditions tested noisy environment three Signals Noise Ratios (SNR). database testing procedure experimentation involved 3-phoneme words selected French Lafon’s lists. Speech corrupted addition multi-talker babble Results showed significant effect SNR. small environments. 500 Hz led better performances than 250 Hz. Higher also observed mode mainly consistent findings obtained previous studies which suggest that users may perform bilateral stimulation environments, higher rate.