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Encyclopedia > Television camera

A professional video camera (often called a "television camera" even though the use has spread) is a high-end device for recording electronic moving images (as opposed to a movie camera, that records the images on film). Originally developed for use in television studios, they are now commonly used for corporate and educational videos, music videos, direct-to-video movies, etc. Less advanced video cameras used by consumers are often referred to as camcorders.


Some professional video cameras have a portable shoulder mount, but most stand on the floor, usually with pneumatic or hydraulic mechanisms to adjust the height, and are usually on wheels. Any video camera when used along with other video cameras in a studio setup is controlled by a device known as camera control unit. The camera control unit along with other equipments is installed in the production control room often known as Gallery of the television studio. When used outside a studio, they are often on tracks. Initial models used analog technology, but digital models are becoming more common.


Professional video cameras capture and transfer two dimensional images sequentially, at specified capture rates, usually in the visible range of the electromagnetic spectrum. These images can then be transmitted to television receivers and replayed on a screen (CRT or LCD) at a frame rate approximating that used by the camera. They serve as a means of communicating valuable information across large distances: world events, telerobotic exploration of planets or satellites, space stations, etc.


It is common for professional cameras to split the incoming light into the three primary colors that humans are able to see, feeding each color into a separate pickup tube (in older cameras) or charge-coupled device (CCD). Some high-end consumer cameras also do this, producing a higher-quality image than what is normally possible with just a single video pickup.


See also


  Results from FactBites:
 
Television - MSN Encarta (897 words)
Television, system of sending and receiving pictures and sound by means of electronic signals transmitted through wires and optical fibers or by electromagnetic radiation.
The camera changes light from the scene into an electric signal, called the video signal, which varies depending on the strength, or brightness, of light received from each part of the scene.
The optical system of a television camera includes a fixed lens that is used to focus the scene onto the front of the pickup device.
ETF - Early Broadcast Equipment (52 words)
The earliest cameras (1926-1933) were generally flying spot scanner types.
In the 30s the Image Dissector camera tube was invented by Philo Farnsworth.
After World War Two the image orthicon became the standard, and in the mid 50s the vidicon was developed.
  More results at FactBites »

 
 

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