With respect to the rf spectrum, an area in which emissions are restricted for the purpose of minimizing possible impact on the operations of radio astronomy or other activities that are highly sensitive to rf interference.

In an FM receiver, the phenomenon that results in less noise when an unmodulated carrier is present than when there is no carrier present.
Note: Quieting is expressed in dB.

1. In a digital video system, a sampling structure where the luminance and color-difference samples are generated from pixels arranged on one of two congruent rectilinear grids.
Note: One grid is displaced horizontally from the other by half the horizontal pixel spacing. The alternate grid is usually chosen for alternate lines, but may also be chosen for alternate field/frames. [After… (Read More →)