Editing Eye pattern (section)

=== Source data ===

The first step of computing an eye pattern is normally to obtain the waveform being analyzed in a quantized form. This may be done by measuring an actual electrical system with an oscilloscope of sufficient bandwidth, or by creating synthetic data with a [[Electronic circuit simulation|circuit simulator]] in order to evaluate the signal integrity of a proposed design. A combination of the two approaches may be used as well: simulating the effects of an arbitrary circuit or [[Transmission_lines|transmission line]] on a measured signal, perhaps to determine whether a signal will still be intelligible after passing through a long cable. [[Interpolation]] may also be applied at this time in order to increase the number of samples per unit interval (UI) and produce a smooth, gap-free plot which is more visually appealing and easier to understand.