Logic signals become corrupted as they travel through a system; the switching edges become exponentials, ringing can occur, and noise may be added. Feeding such a signal through a Schmitt trigger restores the rising and falling edges to a fast transition between the voltages corresponding to the 0 and 1 logic states.
"Schmitt trigger." A Dictionary of Computing. . Encyclopedia.com. (August 18, 2018). http://www.encyclopedia.com/computing/dictionaries-thesauruses-pictures-and-press-releases/schmitt-trigger
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