Reading this result: At a 1.0 Hz beat the throb is too fast to count as a pulse; the ear stops hearing separate beats and instead hears roughness or dissonance around the 10.5 Hz average pitch.
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How it works
When two waves of slightly different frequency superpose, their sum is modulated by an envelope that oscillates at the difference of the two frequencies. This beating is used to tune instruments and to detect tiny frequency differences with great precision.
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