PURPOSE: To simplify the circuit constitution for phase operation and phase matching of chroma signal and to achieve small sized and low cost system, by making the selection of a switch, through the use of a control siganl applied based on horizontal and vertical synchronizing signals in a TV camera.
CONSTITUTION: A color difference signal is separated from a processing circuit 40 from an output of a monotube type color pickup tube 39 of a TV camera 66 and after chroma processing, it is applied to a contact-a of a selector switch 55 inverting the phase of chroma signal each 3-line and to contact-b connected to an inverter 56. A switch control signal S of a selector switch 55 is given with an output in 1/3 frequency-division for the horizontal synchronizing signal and this output is swithced with the output in 1/2 frequency-division of the vertical synchronizing signal and given to other inverters. Thus, the output of the switch 55 is a chroma signal C of (00π) or (ππ0) every field, and applied to a selector switch 69 connected to an inverter 70 at a Y-C separation curcuit 2 of a VTR 67 and becomes the chroma signal C of (000) phase through the switching of a control signal S.
KINOSHITA TAKASHI
YAMAKAWA KIYOSHI
WATANABE YOSHIMI
