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Author: admin | 07.10.2014 | Category: Ringing In The Ears Causes

Might have meant the EBP valve was staying shut - wouldn't make any sense the way he said it. Sparta's Aaron Rushing puts up a shot during the Bulldogs' 48-43 win over Murphysboro at Murphysboro High School in Murphysboro, Ill. In signal processing+, '''white noise''' is a random signal+ with a constant power spectral density+. In discrete time+, white noise is a discrete signal+ whose samples+ are regarded as a sequence of serially uncorrelated+ random variable+s with zero mean+ and finite variance+; a single realization of white noise is a '''random shock'''. The samples of a white noise signal may be sequential in time, or arranged along one or more spatial dimensions. White noise draws its name from white light+, although light that appears white generally does not have a flat spectral power density over the visible band. The term white noise is sometimes used in the context of phylogenetically based statistical methods+ to refer to a lack of phylogenetic pattern in comparative data.
White noise is the generalized mean-square derivative of the Wiener process+ or Brownian motion+. A generalization to random element+s on infinite dimensional spaces, such as random field+s, is the white noise measure+. White noise is commonly used in the production of electronic music+, usually either directly or as an input for a filter to create other types of noise signal.
White noise is also used to obtain the impulse response+ of an electrical circuit, in particular of amplifier+s and other audio equipment.
To set up the equalization+ for a concert or other performance in a venue, a short burst of white or pink noise+ is sent through the PA system+ and monitored from various points in the venue so that the engineer can tell if the acoustics of the building naturally boost or cut any frequencies.
White noise is a common synthetic noise source used for sound masking by a tinnitus masker+.
A random vector+ (that is, a partially indeterminate process that produces vectors of real numbers) is said to be a '''white noise vector''' or '''white random vector''' if its components each have a probability distribution+ with zero mean and finite variance+, and are statistically independent+: that is, their joint probability distribution must be the product of the distributions of the individual components.
A necessary (but, in general, not sufficient+) condition for statistical independence of two variables is that they be statistically uncorrelated+; that is, their covariance+ is zero. In particular, if in addition to being independent every variable in ''w'' also has a normal distribution+ with zero mean and the same variance \sigma^2, ''w'' is said to be a '''Gaussian''' white noise vector. The power spectrum+ ''P'' of a random vector ''w'' can be defined as the expected value of the squared modulus of each coefficient of its Fourier transform ''W'', that is, ''P''''i'' = E(\sigma^2 for all ''i''. If ''w'' is a white random vector, but not a Gaussian one, its Fourier coefficients ''W''''i'' will not be completely independent of each other; although for large ''n'' and common probability distributions the dependencies are very subtle, and their pairwise correlations can be assumed to be zero.
Often the weaker condition "statistically uncorrelated" is used in the definition of white noise, instead of "statistically independent". An example of a random vector that is "Gaussian white noise" in the weak but not in the strong sense is ''x''=[''x''1,''x''2] where ''x''1 is a normal random variable with zero mean, and ''x''2 is equal to +''x''1 or to ?''x''1, with equal probability.
In some situations one may relax the definition by allowing each component of a white random vector ''w'' to have non-zero expected value \mu. In order to define the notion of "white noise" in the theory of continuous-time+ signals, one must replace the concept of a "random vector" by a continuous-time random signal; that is, a random process that generates a function w of a real-valued parameter t.


Such a process is said to be '''white noise''' in the strongest sense if the value w(t) for any time t is a random variable that is statistically independent of its entire history before t. As in the discrete case, some authors adopt the weaker definition for "white noise", and use the qualifier '''independent''' to refer to either of the stronger definitions.
However, a precise definition of these concepts is not trivial, because some quantities that are finite sums in the finite discrete case must be replaced by integrals that may not converge. Some authors require each value w(t) to be a real-valued random variable with some finite variance \sigma^2. In statistics+ and econometrics+ one often assumes that an observed series of data values is the sum of a series of values generated by a deterministic+ linear process+, depending on certain independent (explanatory) variables+, and on a series of random noise values.
Alternatively, in the subset of regression analysis known as time series analysis+ there are often no explanatory variables other than the past values of the variable being modeled (the dependent variable+). These two ideas are crucial in applications such as channel estimation+ and channel equalization+ in communications+ and audio+. In particular, by a suitable linear transformation (a coloring transformation+), a white random vector can be used to produce a "non-white" random vector (that is, a list of random variables) whose elements have a prescribed covariance matrix+. White noise may be generated digitally with a digital signal processor+, microprocessor+, or microcontroller+. White noise+ In signal processing, white noise is a random signal with a constant power spectral density. I recently aquired a Threshold SL-10 and noticed a slight rushing noise on the right mm phono channel that gets louder as I turn up the volume. The OP looks like an RC4136N and there are five MPS6571 and one FPN4250 transistor in the phono.
I examined the board with a magnifying glass and resoldered any joints that looked suspicious but didn't find much improvement. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models.
AIRRAID CAI, ISSPRO boost gauge, Walker BTM muffler, Edge Programmer, ATS ported turbo housing, everything else stock (for now!). The bandwidth of white noise is limited in practice by the mechanism of noise generation, by the transmission medium and by finite observation capabilities. It is used extensively in audio synthesis+, typically to recreate percussive instruments such as cymbal+s or snare drum+s which have high noise content in their frequency domain. It is not used for testing loudspeakers as its spectrum contains too great an amount of high frequency content. For example, Random.org+ uses a system of atmospheric antennae to generate random digit patterns from white noise.
White noise machine+s and other white noise sources are sold as privacy enhancers and sleep aids and to mask tinnitus+.
Recently, a small study found that white noise background stimulation improves cognitive functioning among secondary students with attention deficit hyperactivity disorder+ (ADHD), while decreasing performance of non-ADHD students. In that case, the joint distribution of ''w'' is a multivariate normal distribution+; the independence between the variables then implies that the distribution has spherical symmetry+ in ''n''-dimensional space.


A weaker definition requires independence only between the values w(t_1) and w(t_2) at every pair of distinct times t_1 and t_2.
Indeed, the set of all possible instances of a signal w is no longer a finite-dimensional space \mathbbR^n, but an infinite-dimensional function space+. In this case the noise process is often modeled as a moving average+ process, in which the current value of the dependent variable depends on current and past values of a sequential white noise process.
Generating white noise typically entails feeding an appropriate stream of random numbers to a digital-to-analog converter+.
The term is used, with this or similar meanings, in many scientific and technical disciplines, including physics, acoustic engineering, telecommunications, statistical forecasting, and many more.
I removed, rearranged and resoldered some of the 100k resistors near the opamp chip and things got noisier on both the phono and line stage. In particular, if each sample has a normal distribution+ with zero mean, the signal is said to be Gaussian white noise. Even a binary signal which can only take on the values 1 or -1 will be white if the sequence is statistically uncorrelated. Pink noise+, which differs from white noise in that it has equal energy in each octave, is used for testing transducers such as loudspeakers and microphones. Alternatively, the use of an FM radio tuned to unused frequencies ("static") is a simpler and more cost-effective source of white noise.
Other work indicates it is effective in improving the mood and performance of workers by masking background office noise, but decreases cognitive performance in complex card sorting tasks. Moreover, by any definition a white noise signal w would have to be essentially discontinuous at every point; therefore even the simplest operations on w, like integration over a finite interval, require advanced mathematical machinery. Gain seems much higher for some reason as I can only go about a quarter turn on the volume now whereas I had it around half way before. White noise refers to a statistical model for signals and signal sources, rather than to any specific signal.
Noise having a continuous distribution, such as a normal distribution+, can of course be white. However, white noise generated from a common commercial radio receiver tuned to an unused frequency is extremely vulnerable to being contaminated with spurious signals, such as adjacent radio stations, harmonics from non-adjacent radio stations, electrical equipment in the vicinity of the receiving antenna causing interference, or even atmospheric events such as solar flares and especially lightning. White Noise (novel)+ White Noise is the eighth novel by Don DeLillo, published by Viking Press in 1985. White noise machine+ A white noise machine is a device that produces a sound that is random in character, which sounds like a rushing waterfall or wind blowing through trees. White Noise (film)+ White Noise is a 2005 supernatural thriller film, directed by Geoffrey Sax. The title refers to electronic voice phenomena (EVP), where voices, which some believe to be from the "other side", can be heard on audio recordings.



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