BC-9 - Television Ghosting Interference Analysis

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In television, a ghost image is a duplicate of the original image shifted slightly to the right of the original picture on the television screen. Ghost images appear when the same signal arrives at the viewer's location, having travelled through two or more different paths. Ghosting interference can be widespread or local. When the signal radiated by the television transmitting antenna is reflected by a high-rise building, a telecommunication tower or some other large structure adjacent to the television transmitting site, it creates ghosting interference that usually affects a large area within the service contour. By contrast, local ghosting interference is caused by reflections around the reception site. This type of interference is usually produced by an isolated structure remote from the transmitter. The affected area is normally confined to the surrounding region of the reflecting structure. In either case, the ghosting interference may produce impairment levels ranging from just perceptible to unusable.