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outside broadcasting van at New College, Oxford ]]

Outside broadcasting is the production of Television programmes (typically to cover news and sports events) from a mobile Television Studio . This mobile studio is known as an "Outside Broadcasting Van" or "OB Van". Signals from cameras and microphones come into the OB Van for processing and transmission.

A typical OB Van can be divided into three major parts.

  • The first and largest part is where the director and the technicians sit in front of a video mixer and a wall of monitors. The monitors show all the video feeds from various sources, including Computer Graphics , Cameras , Video Tape s, or Slow Motion Replay Machine s. The wall of monitors also contains a preview monitor showing the "clean" feed (the edited video feed without any computer generated graphics) and a programme monitor that shows the "dirty" feed (video ''with'' overlaid graphics). The dirty feed is what is actually transmitted back to the central studio that is controlling the outside broadcast. The video mixer may be operated by two or more computer specialists who will generate appropriate graphics feeds (such as scores for sports events, or vote counts at elections) to be added to the video.


  • The second part of a van is for the sound engineer; it has a sound mixer (being fed with all the various audio feeds: reporters. commentary, on-pitch microphones, etc. The engineer has can control which channels are added to the output and will follow instructions from the directors. The engineer normally also has a dirty feed monitor to help with the synchronization of sound and video.


  • The last part of the van is the video store. The video store has a collection of video tapes and may also house additional power supplies or computer equipment.