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Thursday, 19 June 2014 15:41

H4-18: LISSAJOUS FIGURES WITH SOUND

Additional Info

  • ID Code: H4-18
  • Purpose: Demonstrate the relation between "consonance" (musical intervals) and frequency ratios.
  • Description: Two identical oscillator/loudspeaker setups are sounded and simultaneously input into the two axes of an oscilloscope to produce a Lissajous figure. Two pitches which are related by simple rational whole numbers such as 3:2 or 5:4 are musical intervals and produce stationary figures. Beats between two close frequencies are also visibly evident by this technique. Try two close frequencies and two related by a small whole number interval for contrast. Let your students judge their consonance.
  • Availability: Available
  • Loc codes: H4, ME2, ME3
Read 795 times Last modified on Monday, 14 August 2017 13:30
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