1. The sound heard in a receiver along with a desired program because of cross modulation or other undesired coupling to another communication channel; it is also observed between adjacent pairs in a telephone cable.

2. Interaction of audio and video signals in a television system, causing video modulation of the audio carrier or audio modulation of the video signal at some point.

3. Interaction of the chrominance and luminance signals in a color television receiver.

See <<magnetic printing>>