Signal noise
In
science, and especially in
physics and
telecommunication, noise is fluctuations in and the addition of external factors to the stream of target information (
signal) being received at a detector. In communications, it may be deliberate as for instance
jamming of a radio or TV signal, but in most cases it is assumed to be merely undesired interference with intended operations. Natural and deliberate noise sources can provide both or either of
random interference or patterned interference. Only the latter can be cancelled effectively in
analog systems; however,
digital systems are usually constructed in such a way that their
quantized signals can be reconstructed perfectly, as long as the noise level remains below a defined maximum, which varies from application to application.
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Bruit de mesure
Rauschen (Physik)
Ruis
Шум