Geometric error compensation circuit of color television camera devices

Claim 1

A geometric error compensation circuit of a color television camera device having means for generating vertical and horizontal scanning sawtooth shaped signals during respective vertical and horizontal scanning periods, said compensation circuit comprising: a first separating circuit for separating said vertical scanning signal into a first signal and a second signal corresponding to fore and rear portions respectively of the vertical scanning period; first and second balanced modulator circuits for effecting balanced modulations of said horizontal scanning signal in accordance with the separated first and second signals, respectively, to provide an output signal for each said first and second modulator circuits, each said output signal having symetrical positive and negative portions; second and third separating circuits for separating the output signals of said first and second balanced modulation circuits into third and fourth output signals, and fifth and sixth output signals, respectively, in accordance with reference levels of its respective said modulating circuit output signals; and compensation signal forming circuits for forming geometric error compensation signals corresponding to specific portions of said horizontal and vertical scanning periods in accordance with said separated third through sixth signals.