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- W2129507172 abstract "Any class of reasonable time-dependent perturbations occurring at random, under certain internal contraints, generates random noise having a spectral density varying as |f| <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>α</sup> over an arbitrarily large range of spectral frequency f only for - 2 ≤ α ≤ 0. A class is the set of all perturbations which are equivalent under some individual indenpendent scaling of amplitute, scaling of time, and translation of time. A subclass is characterized by P(τ) and A <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>2</sup> (τ). P(τ) is the lifetime probability desity. A <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>2</sup> (τ) is a mean square amplitude of perturbations having lifetime τ. For a given class, |f| <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>α</sup> <inf xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>∞</inf> and |f| <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>α</sup> <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>0</sup> are the frequency-smoothed laws in the limits of infinite and zero frequencies, respectively. Any reasonable perturbation has α <inf xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>∞</inf> ≤ - 2 and α <inf xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>0</inf> ≥ 0. To generate random noise having an |f| <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>α</sup> law over an arbitrarily large range of f from a subclass chosen from any class characterized by α <inf xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>∞</inf> and α <inf xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>0</inf> , it is necessary that α <inf xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>∞</inf> ≤ α ≤ α <inf xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>0</inf> . For α <inf xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>∞</inf> < α < α <inf xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>0</inf> , it is necessary and sufficient that such subclasses satisfy the condition, P(τ)A <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>2</sup> (τ) ≈ Bτ <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>- α - 3</sup> with B constant, over a suitable range of τ, and that P(τ)A <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>2</sup> (τ) not be larger than Bτ <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>- α - 3</sup> outside the range. This general mechanical model is of immediate value in the formulation and criticism of specific physical models of |f| <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>α</sup> noise, including flicker noise, and in computer simulation of |f| <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>α</sup> noise." @default.
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- W2129507172 date "1968-01-01" @default.
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- W2129507172 title "A general mechanical model for |f|<sup>α</sup>spectral density random noise with special reference to flicker noise 1/|f|" @default.
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