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Radio transmitting and receiving circuits of a video camera having a detached view finder

  • US 5,179,446 A
  • Filed: 10/22/1991
  • Issued: 01/12/1993
  • Est. Priority Date: 10/22/1991
  • Status: Expired due to Term
First Claim
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1. A radio transmitting circuit which is installed in a main body of a video camera having a detached view finder, said circuit comprising:

  • a charge-coupled device portion providing an electrical signal by converting an image signal of an object input through a lens of said video camera;

    a preprocessor providing a preprocessed signal by performing on the electrical signal an automatic white balance control, an automatic black balance control, a flare compensation, and a gamma compensation;

    a video signal processor providing a composite video signal by performing a luminance/color difference signal process on the preprocessed signal;

    a synchronous signal separator providing vertical and horizontal synchronizing signals from the composite video signal;

    code means for providing an encoded signal, said code means comprising a code generator generating a recognition code using digits 0 through 9 input through a keypad by a user, and an encoder encoding said recognition code from said code generator into the encoded signal;

    a timing controller providing an overlapped signal by overlapping the encoded signal with the horizontal synchronizing signal during a predetermined horizontal synchronizing signal interval;

    a mixer providing a mixed signal by mixing the overlapped signal and the composite video signal;

    a modulating portion providing a modulated signal by modulating the mixed signal with a carrier of a specific frequency; and

    a transmitting poriton amplifying the modulated signal and transmitting the amplified signal at a radio frequency to said view finder through a transmitting antenna.

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