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High Quality Content by WIKIPEDIA articles! Zero-crossing is a commonly used term in electronics, mathematics, and image processing. In mathematical terms, a "zero-crossing" is a point where the sign of a function changes (e.g. from positive to negative), represented by a crossing of the axis (zero value) in the graph of the function.Amplitude of a received signal can change, so limiter and filter is needed. Then there is a circuit which detects zero crossings and produces spikes. This peak signal is the fully rectified and so some kind of digital signal is available.