The interference between two audio or two video signals caused by unwanted stray signals. a) In video, crosstalk between input channels can be classified into two basic categories: luminance/sync crosstalk; and colour (chroma) crosstalk. When video crosstalk is too high, ghost images from one source appear over the other. b) In audio, signal leakage, typically between left and right channels or between different inputs, can be caused by poor grounding connexions or improperly shielded cables. See Chrominance-to-Luminance Intermodulation.