Subharmonic


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subharmonic

[¦səb·här′män·ik]
(physics)
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.

Subharmonic

 

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.

REFERENCES

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.

Subharmonic

 

(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.

References in periodicals archive ?
Tang, Periodic and subharmonic solutions of a class of subquadratic second-order Hamiltonian systems, J.
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That makes this phenomenon very important object for research together with other typical sources of subharmonic and superharmonic vibrations.
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Since [f.sub.N] - f is entire, [[absolute value of [g.sub.N]].sup.p] is subharmonic for any p [member of] N.
It follows from (5.9), (5.10), (5.11), and (5.12) that the function his harmonic in R\({[[zeta].sub.0]} [union][[pi].sup.-1] ({infinity})) and subharmonic at [[zeta].sub.0].
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From the subharmonic Melnikov method [10, 11], the resonance band of [omega] = m/n has 2n fixed points.
The first serial concept (being based on multiplication) leads to a "subharmonic proportional series" (see Example 2), the second one (being based on division) to a "harmonic or overtone series" (see Example 3).
For example, a transmitted signal oscillating at 2,000 hertz (hz) and another at 2,030 hz results in a "subharmonic' signal at 2,015 hz, as well as other signals at 2,060 hz and 2,090 hz.
Leng [22] established some new criteria for the existence and multiplicity of periodic and subharmonic solutions of (10) based on the linking theorem in combination with variational technique.