Ringing artifacts are also present in square waves; see Gibbs phenomenon.

In the animation of a square wave at top right it can be seen that just a few terms already produce a fairly good approximation.

Experiment shows that a square wave can be generated by those amplifiers.

You drive the circuit with a square wave input signal a shown.

This provides stable digital pitch generation but square waves only.

In order to generate the square wave, I chose an extremely cool little microprocessor.

It is called an "edge" because the square wave which represents a signal has edges at those points.

It requires inputs that are symmetrical square waves, or nearly so.

We now illustrate the above Gibbs phenomenon in the case of the square wave described earlier.

Figure B is similar to A, only showing the development of a square wave instead.