We perceive a sound's fundamental frequency as its pitch.
We have learned that when we hear a periodic sound, the pitch we perceive is based on the fundamental frequency of the sound, rather than on any of the harmonics (also called "overtones" or "partials") which may also be present in the signal. We also know that the fundamental frequency is the lowest in frequency of the harmonics (there are exceptions to this which we will disregard for now) and it also has the greatest amplitude of all the harmonics
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