Abstract: A method is described for generating stimulus signals for an auditory prosthesis system. A high frequency signal conveys higher frequency audio information including exceptionally low rate band-pass envelope characteristics. This high frequency signal represents at least the upper part if not all of the range of frequencies for speech, music, and other sounds that are audible to listeners with normal hearing. A separate low frequency signal is also provided representing lower audio frequency information including periodicity characteristics (voiced/unvoiced or periodic/aperiodic distinctions) and for periodic sounds, fundamental frequency characteristics. The high frequency signal is applied to the auditory system of a patient by an associated high frequency stimulator, and the low frequency signal is applied to the auditory system of the patient by an associated low frequency signal.

Abstract: A cochlear implant system is described which includes an electrode array for implantation in the scala tympani of a cochlea. Electrodes on the outer surface of the electrode array apply electrode stimulation signals to nearby neural tissue. An implantable stimulator module develops the electrode stimulation signals. The electrode stimulation signals have different waveforms. A basal waveform for one or more electrodes at the basal end of the electrode array has the form of a sequence of conventional high-amplitude short-duration electrode stimulation signals. An apical waveform for one or more electrodes at the apical end of the electrode array has the form of a sequence of lower-amplitude longer-duration electrode stimulation signals. The apical waveform is adapted to selectively stimulate peripheral neural processes towards the apical end of the electrode array so as to provide a tonotopic place-pitch response to the electrode stimulation signals.

Abstract: A method is described for generating stimulus signals for an auditory prosthesis system. A high frequency signal conveys higher frequency audio information including exceptionally low rate band-pass envelope characteristics. This high frequency signal represents at least the upper part if not all of the range of frequencies for speech, music, and other sounds that are audible to listeners with normal hearing. A separate low frequency signal is also provided representing lower audio frequency information including periodicity characteristics (voiced/unvoiced or periodic/aperiodic distinctions) and for periodic sounds, fundamental frequency characteristics. The high frequency signal is applied to the auditory system of a patient by an associated high frequency stimulator, and the low frequency signal is applied to the auditory system of the patient by an associated low frequency signal.