A zero-crossing is a point where the sign of a mathematical function changes (e.g. from positive to negative), represented by a crossing of the axis (zero value) in the graph of the function. It is a commonly used term in electronics, mathematics, sound, and image processing. ==In electronics== In alternating current, the zero-crossing is the inst...
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http://en.wikipedia.org/wiki/Zero_crossing
A point at which a digitally encoded waveform crosses the center of its amplitude range.
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http://www.encyclo.co.uk/local/22285
The point at which a sinusoidal voltage or current waveform crosses the zero reference axis.
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http://www.youngco.com/young2.asp?ID=4&Type=3
An analog waveform consists of two alternating voltage polarities (positive to negative to positive.
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https://www.encyclo.co.uk/local/22369
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