♠/Slide whistles and harmony/Beats simple

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CNX_UPhysics_17_06_beats.png

The top and bottom graphs of time versus pressure in this audio signal are related. The graph show two signals. When you add them together you get the bottom graph. When the two signals add together it is called destructive interference. Constructive interference occurs when the parabola[1] can be seen when the peak of one signal matches the other's and the amplitude increases is maximized. Since this is a signal of pressure versus time, the constructive an destructive events alternate in time, create a loud-soft repetition known as beats.[2]

Footnotes[edit | edit source]

  1. Parabola? Yes it does look like on
  2. AKA what music teachers call the "wa-wa"