Definition: (1) Jerky, irregular movement of image due to variety of causes e.g. unsteadiness of film transport in gate of projector, faulty animation, low refresh rate of monitor, slow transfer of video data e.g. in videoconferencing or from CD-ROM player. (2) Small fluctuations in time base e.g. irregularities in the stream of pulses used to synchronise multiple tracks; poor synchronisation in wire transmissions leading to jagged images. (3) Irregularities or small variations in the response time of terminals in a network. * NB: Irregularities in the clocks that regulate computer functions are usually fatal, at least to the computer.

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