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Color television camera apparatus and method for producing an analog video signal for use with a plurality of video standard system

  • US 5,255,081 A
  • Filed: 02/21/1992
  • Issued: 10/19/1993
  • Est. Priority Date: 02/25/1991
  • Status: Expired due to Term
First Claim
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1. A color television camera apparatus comprising:

  • image signal generating means for generating digital three-color image signals as a 2fs-rate, in which fs≃

    4fsc and fsc is a sampling clock rate;

    luminance signal generating means for selectively generating a digital luminance signal at a 2fs-rate so as to form a 2fs-rate digital luminance signal corresponding to a selected video standard system selected from among a plurality of video standard systems from the digital three-color image signals;

    chrominance signal generating means for selectively generating digital chrominance signals at a fs-rate so as to form fs-rate digital chrominance signals corresponding to the selected video standard system from the digital three-color image signals;

    modulating means for modulating said fs-rate digital chrominance signals corresponding to the selected video standard system;

    rate converting means having filter means for performing filtering represented by a selected transfer function selected from among a plurality of transfer functions for converting modulated chrominance signals from said modulating means into 2fs-rate modulated chrominance signals, in which the selected transfer function is selected according to the selected video standard system;

    composite video signal generating means for generating a digital composite video signal at a 2fs-rate according to the 2fs-rate digital luminance signal and the 2fs-rate modulated chrominance signals from the rate converting means; and

    digital-to-analog converting means for converting said 2fs-rate digital composite video signal into an analog composite video signal.

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