Lissajous Frequency Measurement
To show how frequencies can be matched using Lissajous figures.
Microphone, oscillator, oscilloscope, and frequency meter, with scope/TV cart.
Obtain a Lissajous figure using a sine wave oscillator (on the horizontal axis) and a musical sound such as a voice or instrument (on the vertical axis). Using the Lissajous figure and the frequency of the oscillator determine the frequency of the musical note. ◙