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IEVref: | 702-02-20 | ID: | |

Language: | en | Status: Standard | |

Term: | group delay | ||

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Definition: | propagation duration of a signal between two points on a transmission path defined in terms of the group velocity by the line integral taken along the transmission path: $\int \frac{1}{{v}_{\text{g}}}}\text{\hspace{0.17em}}\mathrm{d}s$
where Note 1 to entry: In a homogeneous medium, or on a uniform transmission 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 signal used to define the group velocity. Note 2 to entry: In practice, if the medium is not too absorbent, nor too anisotropic, nor too dispersive, the group delay is equal to the propagation duration of the signal used to define the group velocity.
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Publication date: | 1992-03 | ||

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Replaces: | 702-02-20:1992-03 | ||

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$\int \frac{1}{{v}_{\text{g}}}}\text{\hspace{0.17em}}\mathrm{d}s$

where *v*_{g} is the algebraic value of the projection of the group velocity vector onto the tangent to the ray path, and d*s* is the scalar line element

Note 1 to entry: In a homogeneous medium, or on a uniform transmission 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 signal used to define the group velocity.

Note 2 to entry: In practice, if the medium is not too absorbent, nor too anisotropic, nor too dispersive, the group delay is equal to the propagation duration of the signal used to define the group velocity.