Definition: | the propagation time between two points of a signal which may be ideally represented by two superimposed sinusoidal waves of equal amplitude and slightly different frequencies approaching a common limiting value
NOTE – In a homogeneous propagation medium, or on a uniform line, the group delay is equal to the derivative with respect to the angular frequency of the difference, at the same time, of the phases, at the two points, of the common limit wave.
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