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frequency spectrum |
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frequency spectrum [′frē·kwən·sē ‚spek·trəm] (physics) A plot of the distribution of the intensity of some type of electromagnetic or acoustic radiation as a function of frequency. (systems engineering) In the analysis of a random function of time, such as the amplitude of noise in a system, the limit asTapproaches infinity of 1/(2πT) times the ensemble average of the squared magnitude of the amplitude of the Fourier transform of the function from -TtoT. Also known as power-density spectrum; power spectrum; spectral density. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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As compared with the December 14, 2005 test, the frequency spectrum efficiency, or the ratio of data transmission rate to channel bandwidth, was also doubled from 25bps/Hz to 50bps/Hz (5Gbps/100MHz). Grimes has directed the director of the Defense Information Systems Agency (DISA) to establish the Defense Spectrum Organization as a center of excellence for radio frequency spectrum analysis, planning, and support. In 1977, the 21st RTC of MOD launched investigations, within the framework of efforts concerned with EMC of EA, into technical and organizational techniques of increased efficiency of the radio frequency spectrum (RFS) of military EA. |
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