Square-wave meaning

A waveform that rises quickly to a particular amplitude, remains constant for a time period and drops fast at the end. In digital systems, square waves are the norm, because they represent a binary digit (0 or 1). Square waves can also be generated in musical synthesizers and have a raspy sound.
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A periodic wave that assumes one of two fixed, discrete values for equal lengths of time, with each value or group of values representing a digital bit. For example, a given signaling protocol might represent a one (1) bit as +3V (volts) and a zero (0) bit as.
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(mathematics, engineering, signal processing) A function or waveform that alternates regularly and instantaneously between two levels.
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