Simulated phase-locking stimulation: an improved speech processing strategy for cochlear implants.
The continuous interleaved sampling (CIS) speech-processing strategy has been widely used for cochlear implants to extract speech envelope information without preserving phase information. In this study, a novel simulated phase-locking stimulation (SPLS) strategy, which detects zero-crossing times of the narrow-band signal of each band, was developed to extract both phase and amplitude-envelope information from a bank of frequency bands of speech sounds. The advantage of the SPLS strategy over the CIS strategy was confirmed by the results of our psychophysical experiments, showing that normal-hearing Chinese listeners' performance in recognizing SPLS-processed Chinese speech was significantly better than their performance of recognizing CIS-processed Chinese speech under quiet, noise-masking, or speech-masking conditions. Thus, the results suggest that if the SPLS strategy is used to modulate the interval of electrical stimulation pulses in cochlear-implant devices according to extracted phase information, the speech-processing functions of cochlear implant devices would be improved for Chinese cochlear implant users.
Chen
Jing
J
National Key Laboratory on Machine Perception, Speech and Hearing Research Center, Peking University, Beijing, PR China.
Wu
Xihong
X
Li
Liang
L
Chi
Huisheng
H
D044466:Asian People; D001299:Audiometry; D003054:Cochlear Implants; D003638:Deafness / Q000208:ethnology / Q000628:therapy*; D005260:Female; D006801:Humans; D007802:Language; D008297:Male; D008954:Models, Biological; D009622:Noise; D010700:Phonetics; D011474:Prosthesis Design; D011571:Psychoacoustics; D013067:Speech Perception