GROUP DELAY
A phenomenon occurring in poorly designed electronic equipment where there is a variable delay in the transmission of information through the circuit. In video, when several signals are transmitted together and some arrive before others as a result of group delay, the video picture is distorted. For example, in low quality video processors, there may be a substantial delay between the transmission of color and black and white information. The color part does not overlap on the black and white part and a double image or shadows occur, as well as image blur. Good quality video processors automatically compensate for group delay. Group delay may also be invoked in long connecting cables or RF transmission.
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