Interference that in video may show on the screen as \''crawling\'' vertical bars. A ground loop is created when two elements in a circuit - or two different machines connected together - receive their ground reference signal fr om different places. A different ground potential (voltage) creates this loop, interfering with the signal. Special ground-isolation devices are needed to cure the problem. Ground loops are also a problem in audio, wh ere their most disturbing effect is a low frequency oscillation known as \''hum\'' or \''motorcycling\''. Some audio related ground loop problems can be cured by properly reconnecting the ground leading cables to a single point, usually at the most sensitive input area, or at the power supply. Such problems emerge mainly when high amplification is needed, such as when microphones or other sensitive pick-ups are connected to the system.
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