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More specifically, in physics, the term noise has the following meanings: #An undesired disturbance within the Frequency Band of interest; the summation of unwanted or disturbing energy introduced into a Communications System from man-made and natural sources. #A disturbance that affects a Signal and that may distort the Information carried by the signal. #Random variations of one or more characteristics of any entity such as voltage, current, or Data . #A random signal of known statistical properties of amplitude, distribution, and Spectral Density . #''Loosely,'' any disturbance tending to interfere with the normal Operation of a device or system. Noise and what can be done about it has long been studied. Claude Shannon established Information Theory and in so doing clarified the essential nature of noise and the limits it places on the operation of electronic equipment. In some cases a little noise may be considered advantageous, allowing a Dither ed representation of signals below the minimum strength, or between two quantization levels. This is especially true for signals intended for human appreciation, since the brain seems to expect signals to contain a degree of noise. See, for example {Link without Title} SEE ALSO
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