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 ?
To simulate an attack with colored noise, white Gaussian noise was spectrally shaped according to the estimated masking threshold using corresponding watermarked audio clip based on the HAS model [46, 47].
The standard assessment parameters for evaluating Gaussian noise reduction are mean square error (MSE) and peak signal to noise ratio (PSNR).
The algorithms used to remove Gaussian noise cannot remove impulse noise effectively.
Results for additive Gaussian noise is shown in figure 10 and it is very clear from the figure that this algorithm is also standwith this attack.
White Gaussian noise, speckle noise with variance [sigma]2 = 0.
Simulation result shows the bit error rate (BER) of vertical LST architecture OFDM system having 32 sub-carriers, with three transmits and three receives antennas over a Rayleigh fading with additive white Gaussian noise (AWGN) channel.
On the Optimum Detection of Digital Signals in the Presence of White Gaussian Noise.
By applying this unique Gaussian noise technology, designers of computers, cell phones, entertainment systems, test & measurement equipment and many other products can achieve superior performance at a lower cost with simpler circuit layout.
0 is able to mitigate include additive white Gaussian noise, impulse/burst noise, narrowband ingress, common path distortion, micro-reflections and hum modulation.
The toolkit also offers functions to inject impairments into a communications system including IQ gain imbalance, quadrature skew and additive white Gaussian noise (AWGN).
Spirent has added a cost-effective Additive White Gaussian Noise (AWGN) option to the SR5500 which will greatly simplify wireless receiver test setups.
Engineers can simulate a real-world stimulus by adding Gaussian noise, uniform white noise or periodic random noise to a signal created with the editor or imported from a data file.

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