# Amplitude-Frequency Characteristic

Also found in: Acronyms.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

## Amplitude-Frequency Characteristic

the dependence of the amplitude of a sinusoidal oscillation on its frequency at the output of an apparatus. The characteristic is measured by applying an oscillation of constant amplitude and variable frequency to the input of the apparatus in the linear mode. The amplitude-frequency characteristic is often called simply the frequency characteristic. For ease of visualization it is plotted in the form of a curve; the amplitudes or relative amplitudes are laid off along the vertical axis (often in decibels), and the frequencies (sometimes on a logarithmic scale) along the horizontal axis. In electrical engineering, radio technology, and other technical fields, the amplitude-frequency characteristic yields various parameters (frequency pass band, selectivity, and others) by which the operation of apparatus and devices can be assessed.

References in periodicals archive ?
To solve the vibration amplitude-frequency characteristic of the model above, there are many methods such as Harmonic Balance Method, Perturbation Method, Averaging Method, Multiple Scale Method.
(36), which is obtained with Harmonic Equivalent Linearization Method, though there is no analytical solution, this section analyzes the influence of parameters' changes on the amplitude-frequency characteristic by numerical method.
Caption: Figure 2: Dimensionless displacement response time history and amplitude-frequency characteristic curve of the cable midspan.
Effect of Supporting Stiffness on Amplitude-Frequency Characteristic of Pressure Pipe Segment.
Amplitude-frequency characteristic X of coupling RC network
Besides, the amplitude-frequency characteristic curve is determined by fitting the stable vibration amplitude acquired at each actuation frequency.
Caption: FIGURE 16: Amplitude-frequency characteristic and phase-frequency characteristic ([alpha] = 1.2, [beta] = 0.16, 1, 6.25).
In what follows, the amplitude-frequency characteristics of the signal obtained by solving a system of linear PDEs are considered (Table 1, the first column).
Baseed on the accelerations signals, amplitude-frequency characteristics were determined.
10 shows two amplitude-frequency characteristics (at transducers resonance frequency), when one of the characteristics (solid line) represents when the resistor value tends to infinity, that is one of the piezoelectric layer's contacts are open, and the other one (dashed line), when the resistor value is equal to zero--when one of the piezoelectric layer is connected in short circuit.
The experiments of the amplitude-frequency characteristics are carried out under open-loop conditions by an Agilent 35670A dynamic signal analyzer.

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