The illusion works because each tone seems to sounds lower than the preceding. The trick involves not only which tones are played, but also the volume of the individual notes in the tones.Ĭhanges in volume cause the listener to focus on certain notes while ignoring the others. The sound of the Shepard tone is, in reality, a cycling between a limited set of tones, each separated by an octave. T he Shepard tone seems to continually rise or fall in pitc h.
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