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spectral density

   Also found in: Wikipedia 0.01 sec.
spectral density [′spek·trəl ′den·səd·ē]
(electromagnetism)
(mathematics)
The density function for the spectral measure of a linear transformation on a Hilbert space.
(systems engineering)


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Under some sets of conditions on the regression coefficients, the spectral density function, and the parameter values, an Edgeworth expansion of the density as well as the distribution function of a vector of centered and normalized derivatives of the PLL function of arbitrarily large order is established.
multi-scale analysis, (22) power spectral density, and wavelet-based method, (23) need to be performed before any conclusions on the fractal character of these surfaces can be made.
The power spectral density (PSD) [PHI] (w, x) of such a continuous function taken in the y-direction is given along any line parallel to the y-axis as [PHI]([omega], x) = [|[1/[square root of (2[pi])]][[integral].
 
 
 
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