A general term used in electronics to indicate any unwanted electrical disturbance or random signal, unrelated to the signal being processed and tending to modify it. Electronic noise may be the result of several factors: electrical currents and voltages randomly triggered in an electronic device by temperature and voltage applied to the device, avalanches of voltages in an imperfect chip, noise induced by external interfering sources such as the national power-line grid, electric motors, fluorescent lamps, etc. In the digital domain, noise is related to improper digitization processes, poor signal handling, exaggerated signal compression and incompatible signal logic levels.
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