The invention relates to a system for electrical stimulation of a patient's cochlea, comprising a cochlear implant electrode arrangement (16, 18) comprising a plurality of stimulation channels； means (38) for dividing an audio signal into a plurality of analysis channels, each containing a frequency domain signal representative of a distinct frequency portion of the audio signal； means (60, 62) for establishing an electrode-nerve-interface model of hearing stimulation via the cochlear implant electrode arrangement, the model describing, for each of the stimulation channels, the hearing perception impact of a stimulation signal applied to that stimulation channel on the other stimulation channels, wherein each stimulation channel is associated with at least one of the analysis channels； means (42, 54, 56) for determining a signal level value and a noise level value for each analysis channel by analyzing the respective frequency domain signal； means (58) for determining a noise reduction gain parameter for at least some of the analysis channels as a function of the signal level value and the noise level value of the respective analysis channel, wherein the hearing perception impact of stimulation of stimulation channels other than the stimulation channel(s) associated with the respective analysis channel on the stimulation channel (s) associated with the respective analysis channel is taken into account via the electrode-nerve-interface model； means (44) for applying noise reduction to the frequency domain signal according to the noise reduction gain parameters to generate a noise reduced frequency domain signal； and means (14, 46, 48) for generating a stimulation signal for each of the stimulation channels according to the noise reduced frequency domain signal.L'invention concerne un système de stimulation électrique de la cochlée d'un patient, ledit système comportant un agencement d'électrode d'implant cochléaire (16, 18) comportant une pluralité de canaux de stimu
