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Auditory displays are developed and investigated for mobile service robots in a human–machine environment. The service robot domain was chosen as an example for future use of auditory displays within multimedia process supervision and control applications in industrial, transportation, and medical systems. The design of directional sounds and of additional sounds for robot states as well as the design of more complicated robot sound tracks are explained. Basic musical elements and robot-movement sounds are combined. Experimental studies on the auditory perception of directional sounds as well as of sound tracks for the predictive display of intended robot trajectories in a simulated supermarket scenario are described.