In an embodiment, the processing unit is configured to process the received data signal and generate an output. The output is configured to generate perceivable stimulation for the user. For example, such perceivable stimulation includes perception of sound in case of implantable hearing aids. The medical device thus may be selected from a group consisting of one or more of
i) an implantable hearing aid comprising a cochlear implant comprising an implantable electrode array configured to be positioned within a cochlea of the user, the electrode array being configured to deliver electrical charges in accordance with the output. A typical, non-limiting, description of such cochlear implant is available in pending European patent application EP3045204 (A cochlear implant and an operating method thereof), in particular in