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Electrical hearing by cochlear implants (CIs) may be fundamentally differentfrom acoustic hearing by normal-hearing (NH) listeners, presumably showingunequal speech quality perception in various noise environments. Noisereduction (NR) algorithms used in CI reduce the noise in favor ofsignal-to-noise ratio (SNR), regardless of plausible accompanying distortionsthat may degrade the speech quality perception. To gain better understanding ofCI speech quality perception, the present work aimed investigating speechquality perception in a diverse noise conditions, including factors ofspeech/noise levels, type of noise, and distortions caused by NR models.Fifteen NH and seven CI subjects participated in this study. Speech sentenceswere set to two different levels (65 and 75 dB SPL). Two types of noise(Cafeteria and Babble) at three levels (55, 65, and 75 dB SPL) were used.Sentences were processed using two NR algorithms to investigate the perceptualsensitivity of CI and NH listeners to the distortion. All sentences processedwith the combinations of these sets were presented to CI and NH listeners, andthey were asked to rate the sound quality of speech as they perceived. Theeffect of each factor on the perceived speech quality was investigated based onthe group averaged quality rated by CI and NH listeners. Consistent withprevious studies, CI listeners were not as sensitive as NH to the distortionmade by NR algorithms. Statistical analysis showed that the speech level hassignificant effect on quality perception. At the same SNR, the quality of 65 dBspeech was rated higher than that of 75 dB for CI users, but vice versa for NHlisteners. Therefore, the present study showed that the perceived speechquality patterns were different between CI and NH listeners in terms of theirsensitivity to distortion and speech level in complex listening environment.

The effect of speech and noise levels on the quality perceived by cochlear implant and normal hearing listeners