A loss of carrier signal (and sound) in a wireless system. Can be caused by multi-path or a weak signal due to a low transmitter battery or too far a distance. see also multi-path
In printing, halftone with no screen dots in the highlights or background. Also, color not sensed by optical reading devices. Also, ink colors which will not image a photographic plate.
A momentary loss of the carrier and sound, or a buildup of background noise when the transmitter is in a certain location in the room.