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A sinusoidal quantity having a frequency that is an integral submultiple of the frequency of some other sinusoidal quantity to which it is referred; a third subharmonic would be one-third the fundamental or reference frequency.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



in radio engineering, a sinusoidal oscillation with a frequency usually equal to an integral submultiple or proper fraction of the fundamental frequency. Subharmonics are produced by means of frequency dividers. Some frequency dividers can reduce the frequency by a factor of several thousand in a single stage.


Rizkin, I. Kh. Umnozhiteli i deliteli chastoty. Moscow, 1966.
Hughes, W. Nelineinye elektricheskie tsepi. Moscow, 1967. (Translated from English.)
Lapitskii, E. G., A. M. Semenov, and L. N. Sosnovkin. Raschet diapazonnykh radioperedatchikov. Leningrad, 1974.



(Russian, unterton), a sinusoidal component of a periodic oscillation of complex shape. The frequency of a subharmonic is an integral submultiple—usually by a factor of two—of the fundamental frequency. As a rule, subharmonics occur in nonlinear systems.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
On the contrary, as discussed in the previous section, Figures 5 and 8 show how the current injected by the microinverter is characterized by strong subharmonic components when operating in burst mode.
The study of systems with asymmetric nonlinearities has motivated a great deal of works which investigate the existence and the multiplicity of periodic and subharmonic solutions (see [16, 26, 44, 47, 51, 52, 58, 61] and the references therein).
[22] presents a procedure to investigate the chaos and subharmonic resonance of strongly nonlinear practical systems by using a homotopy method that is adopted to extend the Melnikov functions to the strongly nonlinear systems.
(c) Induction generator effects: when the effective stator and grid resistance at machine terminals is negative, the stator subharmonic currents interact with the rotor circuit inducing high voltages.
Pure sine wave UPS has highest amplitude of the subharmonic and square wave UPS has lowest order.
Jefferies "Subharmonics and chaos in a controlled switched-mode power converter," IEEE Trans.
Guo, Homoclinic orbits and subharmonics for nonlinear second order difference equations, Nonlinear Anal.
Smith, "Multiple stable subharmonics for a periodic epidemic model," Journal of Mathematical Biology, vol.
Typical spurious for the two models is at -80 dBc, with typical harmonics of-40 dBc and subharmonics at -25 dBc.
The case m = 1, n = 2, 3,..., denotes the well-known harmonics, the resonances n = 1 and m = 2, 3,..., are called subharmonics of order 1/2, 1/3,...