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- W2100472006 abstract "The object of this paper is to give some novel calculations of noise statistics. The zero crossing problem is analyzed for nonstationary noise, and some features of the envelope of noise are established. The theory underlying the formulation of the average number of times per second a noise (possibly nonstationary) takes on a specified value is given in some detail. The crossing rate is found in terms of a rather simple integral for the nonstationary noise consisting of the sum of stationary Gaussian noise and a determinate signal. The integral is evaluated in closed form for any determinate signal having a graph composed of straight line segments. In turn the sine wave case is approximated by a triangular wave case. The following two properties of the envelope of noise are proved: (1) the mean square output of an envelope detector is twice the mean square input (independent of the statistics of the input), and (2) the derivative of the envelope of stationary Gaussian noise has a Gaussian first probability distribution. The first property is easy to derive, but it seems not to have been mentioned in the literature; of eourse, it is well known for Gaussian noise and for sine waves. The general version given here is useful in calculations of signal to noise ratios when the interference has non-Gaussian statistics. A heuristic derivation of the second property was included in reference (3). This second result has-application in certain radars, and it is also of general interest in that it displays a nonlinear transformation of Gaussian noise which leaves the first distribution Gaussian. It is rather burdensome to analyze rigorously noise problems that cover a wide front; however, since the scope of this paper is rather narrow, the analysis hera has been carried through on a rigorous basis. It is felt that additional insight is gained when at least some of the problems are so analyzed." @default.
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- W2100472006 date "1959-05-01" @default.
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- W2100472006 title "Some results on noise through circuits" @default.
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- W2100472006 doi "https://doi.org/10.1109/tit.1959.1057529" @default.
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