When two notes or signals of the same amplitude and close in frequency are mixed, whether tuning a guitar or in a receiver, a repetitive pattern emerges called the beat frequency. It is the result of the combination of the two waveforms. The phenomenon of beats produces a throbbing or pulsating tone when the notes are in the audible range. In other words, the two sounds mix together periodically to produce silence! If you click and drag the black rectangle in the bar above slowly to the right to mimic the passage of a fraction of a second, you will be able to see the beats form and move by as nearly flat areas of the curve.

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