21. Any basis that is " close " to sines will do better than square waves . 22. Bursting comes in three distinct forms : square wave bursting, parabolic bursting, and elliptic bursting. 23. Its sound capability was a two-voice square wave generator. 24. The tank selects the fundamental of the square wave , which is amplified and fed back. 25. The square wave is derived from the sawtooth waveform using a simple, single-transistor waveshaping circuit. 26. Ringing artifacts in non-ideal square waves can be shown to be related to this phenomenon. 27. Thus, as a minimum, a square wave is required. 28. A square wave generator was included on the 6522. 29. As already mentioned, an ideal square wave has instantaneous transitions between the high and low levels. 30. Changing the square wave as described above is an example of pulse-width modulation ( PWM ).
