Oscilloscopic waveforms

An oscilloscope typically displays a lissajous pattern when one signal source is connected to the X-axis channel, and another signal source is connected the Y-axis channel. These channels correspond to the horizontal and vertical aspects of the picture. Various frequency ratios produce multi-looped lissajous curves. The motion of the display creates an impression of an automatically generated animated image. A pulsed signal fed into the Z-axis intensity modulation channel creates broken line effects. Multiple sine-wave additions create more complex patterns. When a complex sine wave is fed into both the X and Y channels of an oscilloscope (with one channel out of phase or delayed with the other) more complex lissajous are created, including flower-like modulations that rotate about a central axis. Many pleasing waveform combinations can be created by the addition of sine waves for each channel of the oscilloscope. By superimposing coloured versions of the display one on top of each other, a complex animated multi-coloured video is produced. The examples shown illustrate multi-coloured and multi-layered oscilloscopic lissajous curves filmed directly from the face of an oscilloscope and colourised with a vision mixer.