Color difference line sequential circuit in a magnetic recording system

摘要

A color difference line sequential circuit for use in a magnetic recording apparatus such as an electronic still camera or the like in which an image signal is frequency modulated and is then recorded in a magnetic recording medium. The color difference line sequential circuit can eliminate the effects of a clamping operation performed when a color difference signal is line sequentialized. In the color difference line sequential circuit, when the color difference signals are line sequentialized in a recording system, the direct current levels of color difference signals R-Y, B-Y during the blanking periods thereof are clamped by two kinds of clamp pulses output every 2 H and different 180 DEG from each other in phase, respectively, and one of the two color difference signals that is not clamped is selectively taken in and line sequentialized by a select signal created based on the above two clamp pulses, whereby it is possible to prevent the deterioration of the quality of reproduced pictures due to a clamping operation in recording.