https://wiki.seg.org/index.php?title=Dictionary:Frequency/en&feed=atom&action=historyDictionary:Frequency/en - Revision history2019-10-15T06:07:43ZRevision history for this page on the wikiMediaWiki 1.31.4https://wiki.seg.org/index.php?title=Dictionary:Frequency/en&diff=47609&oldid=prevFuzzyBot: Updating to match new version of source page2017-03-02T19:44:29Z<p>Updating to match new version of source page</p>
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'''1'''. Symbol, ''f''. The repetition rate of a periodic waveform, measured in &#x2018;&#x2018;per second&#x2019;&#x2019; or Hertz. The reciprocal of period. Compare [[Special:MyLanguage/Dictionary:spatial_frequency|''spatial frequency'']]. <br />
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'''2'''.<b> Angular frequency</b> &#x03C9;, measured in radians per second, is to frequency ''f'' as 2&#x03C0;: <br />
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<center><math>\omega=2\pi f</math></center><br />
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'''3'''. The <b>dominant frequency</b> of wavelets refers to an approximate repetition (the reciprocal of the peak-to-peak time interval) even though the entire wavelet does not repeat. See Figure [[Special:MyLanguage/Dictionary:Fig_W-2|W-2]]. <br />
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[[File:Segw2.jpg|center|thumb|600px| Figure [[Special:MyLanguage/Dictionary:Fig_W-2|W-2]]. <b>Wave definitions</b>. For sinusoids, (<b>a</b>) how displacement at one point varies with time; (<b>b</b>) how wave looks at different places at a given instant. (<b>c</b>) If wavefront approaches at an angle, the apparent wavelength differs from the true wavelength. For nonperiodic waves, (<b>d</b>) dominant period is based on the time between principal adjacent troughs (or peaks); (<b>e</b>) dominant wavelength is measured similarly. ]]<br />
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'''4'''. The <b>frequency content</b> of a waveform refers to the amplitudes of the sinusoidal components into which the waveform can be decomposed by Fourier analysis, even where there is nothing repetitive about the waveform itself; <b>frequency spectrum</b>. For mathematical symmetry, the Fourier integral is usually written for frequencies from &#x2013;&#x221E; to +&#x221E;. Negative frequencies can be thought of as the repetition rate where one counts backward in time.<br />
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==External links==<br />
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