Editing Vision mixer (section)

== Setup ==
[[Image:Video switcher rear.jpg|thumb|Rear connection panel of a Sony DVS-7000 vision mixer main unit. Some of the [[BNC connector]]s accept source inputs, while others output video from the various buses and aux channels. The [[D-subminiature]] ports interface with other equipment such as the [[Chroma key|keyer]], [[Tally light|tally]], and control panel.]]

Since vision mixers combine various video signals such as VTRs and [[professional video camera]]s, all these sources must be in proper [[synchronization]] with one another. In professional analog facilities, all the equipment is [[genlock]]ed with [[black and burst]] or [[Tri Level Sync|tri-level sync]] from a [[video-signal generator]]. The signals that cannot be synchronized (either because they originate outside the facility or because the particular equipment doesn't accept external sync) must go through a [[frame synchronizer (video)|frame synchronizer]]. Some vision mixers have internal frame synchronizers or they can be a separate piece of equipment, such as a [[time base corrector]]. If the mixer is used for video editing, the editing console (which usually controls the vision mixer remotely) must also be synchronized. 

Most larger vision mixers divide the control panel from the actual hardware that performs the mixer functions because of noise, cooling and cable length considerations. With such mixers, the control panel is located in the [[production control room]], while the main unit, to which all cables are connected, is often located in a machine room alongside the other hardware.