Construct · 1 fields · 2 citations
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The noise floor is the level of background noise present in a system in the absence of any signal, setting the lower limit below which a signal cannot be distinguished. Its irreducible physical basis is the thermal agitation of charge carriers, measured in Johnson's 1928 Thermal agitation of electricity in conductors and given its theory the same year in Nyquist's Thermal agitation of electric charge in conductors, which showed the noise power depends only on temperature and bandwidth. The referent is the residual noise level of a channel or instrument, measured as noise power or voltage over a stated bandwidth, and it sets one end of a system's dynamic range.[1][2]
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