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
• References: REFERENCES: (PIRA unknown.)
• Loc codes: H4, ME2, ME3