  The variation of the velocity of a periodic signal and its frequency along
the world line of a standard emitter (at rest with an observer) are considered
in a space with affine connections and metrics. It is shown that the frequency
of the emitted periodic signal is depending on the kinematic characteristics of
the motion of the emitter in space-time related to its shear and expansion
velocities. The same conclusions are valid for a standard clock moving with an
observer.
