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3.2.2.2.2 Inharmonic Series
Inharmonic, in this context, means “not forming a harmonic series.” Some waveforms do not repeat themselves
at a regular interval; the spectra of such waves will have components at strange non-integral frequency ratios, or
they may have shifting spectral components that die out and reappear. Some percussion instruments, such as
kettledrums, or bells, have inharmonic spectral components.
In audio synthesis, you can use various modulation techniques—such as AM and FM—to generate inharmonic
spectra.
