A system for stimulation of a patient's ipsilateral cochlea, having at least two spaced apart patient-worn microphones for providing first and second audio signals from ambient sound； a sound processor for generating an ipsilateral auditory nerve stimulation signal in a plurality of output channels from at least one of the input audio signals； and a stimulation assembly for being implanted within the ipsilateral cochlea and having a plurality of stimulation channels for ipsilateral stimulation of the patient's hearing according to the ipsilateral auditory nerve stimulation signal. The sound processor comprising a DOA unit for determining periodically a main direction of incidence of ambient sound from a sound source by analyzing the first and second audio signals, and a directional information coding unit for coding information concerning the determined main direction of incidence in the ipsilateral auditory nerve stimulation signal in manner to enable the patient to localize the sound source.
