The Digital Fact Book - Quantel

Axis (x, y, z)Used to describe the three-dimensional axes set at right angles to each other, available inDVE manipulations. At normal x lies across the screen left to right, y up the screen bottomto top and z points into the screen. Depending on the power of the equipment and thecomplexity of the DVE move, several hierarchical sets of xyz axes may be in use at onetime. For example, one set may be referred to the screen, another to the picture, a thirdoffset to some point in space (reference axis) and a fourth global axis controlling anynumber of objects together.ABAxes controlling picture movementPicture axisZYXScreen axisYXYXManipulated pictureZReference axisSee also: DVE, KeyframeBackground loadingRecording material into a system, such as a nonlinear editor, as a background task.Thus the foreground task continues uninterrupted and when one job is completed,the next is already loaded – potentially increasing the throughput of the editing system.Background taskA secondary operation that is completed while the main (foreground) operation continuesuninterrupted. This requires an overhead in machines’ capabilities beyond that neededfor their primary foreground operation. This has particular benefits in pressured situationswhere time is short, or simply not available for extra operations – such as during editsessions, live programming and transmission. Examples are Quantel’s use of Gigabit Ethernetfor the background transfers of pictures, video, audio and metadata. The equipment isdesigned so it continues its primary foreground operations during all such transfers.29