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Sound input devices include voice recognition systems. They allow the user to interact with the system through voice commands that are recognized and processed by the computer.

Sound presentation devices include software and hardware interfaces that enable spatialized sound (Tsingos and Warusfel 2006). They allow the simulation of spatial location cues. In other words, the intensity of a sound will depend on the distance between the source of the sound and the user. For example, music emanating from a radio set in a virtual environment will be perceived less and less strongly as the user moves away from it.