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 ?
2004; Polzin 2004a), including the particular subset of wave interactions known as parametric subharmonic instability (PSI; Staquet and Sommeria 2002; MacKinnon and Winters 2005; Alford et al.
Then -h extends to be a subharmonic function on D, and there exists a harmonic function k on D and a constant b [greater than or equal to] 0, such that
For the definition and properties of subharmonic functions, see e.
From the frequency spectrums of all the UPSs it is clear that outputs of all the uninterruptible power supplies contains subharmonics, harmonics and Interharmonics.
with a discharge frequency similar to the vibration frequency) and 1 responded with a subharmonic discharge frequency (44 imp/s), however this latter unit was driven with direct muscle vibration.
We usually think of this as a high-frequency effect, but there are important military and commercial avionics requirements that call for conducted susceptibility testing at power-line harmonic and subharmonic frequencies.
Subharmonic mixers offer an alternative to fundamental mixers in that the LO frequency is at some integer fraction 1/n of the fundamental LO frequency [f.
The main objectives of this paper are to explore different types of complex behaviour, such as subharmonic oscillations and chaos, in the converters as system parameters are changed.
Chan, "Low conversion-loss fourth subharmonic mixers incorporating CMRC for millimeter-wave applications," IEEE Transactions on Microwave Theory and Techniques, Vol.
6), the main frequency peak is about 3000 Hz and 7000 Hz as the second harmonics and low V subharmonic on 1500 Hz.
The effect of the ferroresonance not only described as the jump to a higher frequency state, but also it is given with bifurcations to the subharmonic, quasi-periodic, and chaotic oscillations in any circuit containing a nonlinear inductor (STOJKOVSA et al.