# Frequency Deviation

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## frequency deviation

[¦frē·kwən·sē ‚dē·vē′ā·shən]
(communications)
The peak difference between the instantaneous frequency of a frequency-modulated wave and the carrier 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 It might be outdated or ideologically biased.

## Deviation, Frequency

the change of the frequency of oscillations from its average value. In frequency modulation, the maximum frequency difference is usually called the deviation frequency. The composition and values of the amplitudes of the components of the spectrum of a frequency-modulated oscillation, as well as the freedom from interference of a radio system, depend on the magnitude of the frequency deviation.

References in periodicals archive ?
The 3.03 percent frequency deviation is statistically significant at the 0.01 level.
where [DELTA]f(t) is the frequency deviation from the nominal frequency.
It is used to enable primary frequency control such that a system can have frequency deviation and frequency can be stable with steady state error if the load has been changed.
The combined effects of both the tie-line power and the system frequency deviation are generally treated as controlled output of AGC known as Area Control Error (ACE).
The normalized frequency offset factor is defined as the ratio of the carrier frequency deviation to the subcarrier spacing.
The PID controller is also used to damp the frequency deviation of the benchmark system as a competitive method.
As illustrated in the table, the natural frequency of the tooth fracture model decreases in each order; the frequency deviation of the fourth and sixth order is relatively large.
The relative frequency deviation is lower than 0.4%, which evidences that the vibration frequency is approximately equal for the mode order in each position.
For all of four vehicle IPs and their respective levels of 1-d modeling simplifications, the 1st global frequency deviation is within +/-12%.
To evaluate device performance during shock, the transient frequency deviation was measured during a mechanical shock event following the specifcations of MIL-STD-883H Method 2002  for a 1 ms half sine wave shock pulse with an acceleration of 500 g.
Assuming that the relative frequency deviation [y.sub.i] (12) of clock signal follows Gauss distribution, whose Allan deviation can be expressed as 3E - 12/[square root of [tau]], the detection performance of the method for phase and frequency jumping is shown in Tables 1 and 2.
The samples are used for calculating phasor voltage and frequency deviation from the nominal frequency.

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