Figure 4. Drawings illustrate ABI function. The microphone receives the sound (1). The sound is sent to the speech processor, which analyzes and digitizes the sound into coded signals (2). The coded signals are sent to the transmitter, which sends the code across the skin to the internal implant (3). The implant converts the code into electrical signals (4). The signals are sent to electrodes to stimulate the cochlear nuclei in the brainstem (5). The electrical impulse travels normally along the remaining auditory pathway (6).