Analog Video Signal
  • When the cathode ray tube was developed in the 1920s, technology limitations of the time made it difficult to run monitors at anything other than a multiple of the AC line frequency used to power the set
  • Composite
  • Composite video is the format of an analog television (picture only) signal before it is combined with a sound signal and modulated onto an RF carrier.
  • It is a composite of three source signals called Y, U and V (together referred to as YUV) with sync pulses.
  • Most analog home video equipment records a signal in (roughly) composite format:
    • LaserDiscs store a true composite signal
    • VHS tapes use a slightly modified composite signal.
    • These devices then give the user the option of outputting the raw signal, or modulating it on to a VHF or UHF frequency to appear on a selected TV channel.
  • Component
  • luma
  • two chroma
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