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Black noise

Black noise: Noise that has a frequency spectrum of predominately zero power level over all frequencies except for a few narrow bands or spikes.

Note: An example of black noise in a facsimile transmission system is the spectrum that might be obtained when scanning a black area in which there are a few random white spots. Thus, in the time domain, a few random pulses occur while scanning.

Source: from Federal Standard 1037C

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