Resultant Tones

Resultant tones are tones that are produced by the interference of different frequencies. Beats are a common type of resultant tone.

Listen as a third, different note is produced from two interval notes, the third and fifth, resulting in a major triad from only two notes.

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4 Responses to “Resultant Tones”

  1. Cobrun Sells says:

    I had heard about undertones before and didn’t quite understand how they came about. Undertones are quite shockingly obvious on glockenspiels when playing smaller intervals in the top octave (also sounding quite painful if standing right next to the bell set while playing minor seconds =) ). I found out something interesting as well; 600hz-500hz=100hz as a resultant tone. But, 500hz-the new 100hz=400hz. 400hz-100hz=300hz. 300hz-100hz=200hz and so on. Just by playing 500hz and 600hz we can audibly dictate 6 different pitches; 100hz 200hz 300hz 400hz 500hz 600hz!

  2. Cobrun Sells says:

    Actually, Mark, you do use undertones. When you tune low octaves on the piano you told me to listen for the lower note (when tuning E1 to the note E2 listen to E1). At first I was confused when you said to listen to the lower note (E1) when how can the fundamental of the lower note of an octave beat with any partial from the higher octave (E2)? Well, I figured it out. If the fundamental of E2 is 100Hz (I know it isn’t, but let’s just say it is) then E1 is roughly 50HZ. 100-50=50Hz. So when listening to E1 there is the “true” E1 and the “resultant” E1 which is the resultant of E2-E1 frequencies. If E2 is 100 and E1 is 45 then the resultant is 55. 55-45=10 beats per second. So the interval tE1 and rE1 (true and resultant E1) is 10 beats out of tune.

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