One classic technique for frequency measurement, for example, is using a scope to display a Lissajous pattern. [Franz Schaefer] has a video showing how to generate these useful curves with GNU Radio.

A Lissajous curve is formed when two sine waves plotted on their respective X and Y axes. You can see one using an oscilloscope and a couple of signal generators, if you play with one of those ...

He then 3-D prints these three-dimensional Lissajous curves to show what these three-note chords "look"like in real space.

The usefulness of a test depends on how descriptive the results are. With the help of transducers, oscilloscopes are used to probe, monitor, and calibrate all kinds of systems ...

Instead, he was inspired by the harmonograph, a mid-19th century mechanical apparatus that produces Lissajous curves, a complex family of shapes studied by mathematicians.

Unlike a spirograph, a harmonograph uses pendulums (instead of human effort—I mean, I’ll go to the gym if I’m gonna work out, know what I mean?) to create its elegant Lissajous curves. This ...

The ABC squiggle is technically known as a “Lissajous curve.” We had no idea what that was, so we consulted Wikipedia. Apparently: In mathematics, a Lissajous curve (Lissajous figure or ...

The waveform and harmonograph get more complex as larger number ratios occur: the combination of C and C♯ (a semitone) has a shrill sound, and the Lissajous curve is correspondingly intricate ...