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- Integral multiples of the fundamental frequency. The first harmonic is the fundamental,
and the second is twice the frequency of the fundamental, etc.
- Also
called overtones, these are vibrations at frequencies that are multiples of the
fundamentals. Harmonics extend without limit beyond the audible range. They are
characterized as even-order and odd-order harmonics. A second-order harmonic is
two times the frequency of the fundamental; a third order is three times the
fundamental; a fourth order is four times the fundamental; and so forth. Each
even-order harmonic second, fourth, sixth, etc.-is one octave or multiples of
one octave higher than the fundamental; these even-order overtones are therefore
musically related to the fundamental. Odd-order harmonics, on the other hand
third, fifth, seventh, and up-create a series of notes that are not related to
any octave overtones and therefore may have an unpleasant sound. Audio systems
that emphasize odd-order harmonics tend to have a harsh, hard quality.
Source:
http://www.owenscorning.com/around/sound/glossary.asp
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