White Noise


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White Noise

The audio equivalent of Brownian motion. Sounds that are unrelated and sound like a hiss. The video equivalent of white noise is "snow" in television reception.

Random Walk Theory

An investment philosophy holding that security prices are completely unpredictable, especially in the short term. Random walk theory states that both fundamental analysis and technical analysis are wastes of time, as securities behave randomly. Thus, the theory holds that it is impossible to outperform the market by choosing the "correct" securities; it is only possible to outperform the market by taking on additional risk. Critics of random walk theory contend that empirical evidence shows that security prices do indeed follow particular trends that can be predicted with a fair degree of accuracy. The theory originated in 1973 with the book, A Random Walk Down Wall Street. See also: Efficient markets theory.
References in periodicals archive ?
We interpolated all gaps up to 30 days using a combination of data-specific deterministic model and white noise. Right after the interpolation was completed, the median percent of gaps changed from 15% into 1% of entire data.
The results show that the level of white noise GSR had a significant effect on Working Memory., F (1.20, 43.36) = .89, p < .001.
Seiwert created "White Noise" in collaboration with a German software artist named Frieder Weiss.
About the noise parameters, we adopt earlier works on white noise [24] for the strength of our correlated noise [[sigma].sup.2.sub.r], which yields the optimal solution as discussed in the sensitivity analysis Section 3.5.
For reader's convenience, we shall briefly introduce the mathematical definition of Brownian motions and the relation between white noise and Brownian motions.
a is an (unknown) autocorrelation parameter, and [n.sub.i] is a white noise with instantaneous Gaussian distribution N(0, [[sigma].sup.2]).
Among them are entanglement protection and generation under continuous monitoring, completely positive transformations of quantum operations, generating semigroups by degenerate elliptic operators arising in open quantum systems, the spectral gap of the n-photon absorption-emission process, white noise theory, computational complexity of a quantum algorithm for factoring, an isometry formula for a new stochastic integral, and complexities for Gaussian communication processes.
"White Noise" is the first play by Tom Block, a well-known Washington, DC painter, human right activist and author of two books.
Safe Dreams White Noise Sleep Soother WHITE noise is said to remind babies of being in the womb, and this app, which can be downloaded on to any iPhone or iPad, consists of four sounds including an air conditioner, a jet cabin, the womb and pure white noise.
After several nights of interrupted sleep, my wife and I broke down and bought a white noise machine for the boy.
They worked well to block out the train noise when I was on a trip, but to be clear, that was just the white noise of the train's rumbling and clacking.