Ghosting (television)

In television, a ghost is a replica of the transmitted image, offset in position, that is superimposed on top of the main image. It is often caused when a TV signal travels by two different paths to a receiving antenna, with a slight difference in timing.^[1]

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For related terms, see Ghost image (disambiguation).

Digital ghosting[edit]

Ghosting is not specific to analog transmission. It may appear in digital television when interlaced video is incorrectly deinterlaced for display on progressive-scan output devices. The mechanisms that cause ghosting in analog television may corrupt the signal beyond use for digital television. 8VSB, COFDM, and other modulation schemes seek to correct this.

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Ghost-canceling reference

Onion skinning

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along the communication channel, which causes unwanted reflections. The technical term for this phenomenon is ringing.

Mismatched impedance

distortion, because radio frequency waves may take paths of different length (by reflecting from buildings, transmission lines, aircraft, clouds, etc.) to reach the receiver. In addition, RF leaks may allow a signal to enter the set by a different path; this is most common in a large building such as a tower block or hotel where one TV antenna feeds many different rooms, each fitted with a TV aerial socket (known as pre-echo). By getting a better antenna or cable system it can be eliminated or mitigated.