square wave

For other senses of the word, see square.A square wave is a kind of non-sinusoidal waveform, most typically encountered in electronics and signal processing. An ideal square wave alternates regularly and instantaneously between two levels.
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A wave that has two significant conditions, i.e., two levels of amplitude, that change from one condition to the other in a relatively short time compared to the wavelength. Note: When the instantaneous amplitude is plotted versus time or distance, the waveform has a rectangular shape. [From Weik '89]

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