CoachA periodic sound of frequency — the fundamental — is in general a sum of sines at the frequencies , , its harmonics. A sound reduced to its fundamental is a pure tone, like a tuning fork’s.
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Example 21.15 (Why you recognize the caller)
A flute’s A is nearly a pure tone; a violin bowing the same adds strong harmonics at . Same pitch and loudness, yet no one confuses them: a voice, too, is a spectrum you know by heart.