Noisy Black

1. In facsimile or display systems, such as television, a nonuniformity in the black area of the image, i.e., document or picture, caused by the presence of noise in the received signal.
2. A signal or signal level that is supposed to represent a black area on the object, but has a noise content sufficient to cause the creation of noticeable white spots on the display surface or record medium.

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narrowband modem national communications system national information infrastructure near field diffraction pattern near real time negative acknowledge character neper net gain net operation network administration network architecture	network engineering network interface network interface device network management network operating system network termination 1 network topology neutral direct current telegraph system noise noise equivalent power noise figure	noise level noise power noise temperature noise weighting noisy white non fixed access non return to zero normalized frequency ep telecommunications n entity nuclear hardness	numerical aperture nyquist interval off axis optical system off hook office classification off line off the air one way trunk on hook on premises wiring on the air