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The noise power in a bandwidth of 1 Hz, i.e. , the noise power per hertz at a point in a noise spectrum. Note: The noise-power density of the internal noise that is contributed by a receiving system to an incoming signal is expressed as the product of Boltzmann's constant, k, and the equivalent noise temperature, T n. Thus, the noise-power density is often expressed simply as kT . Synonym kT . [From Weik '89]