COLOR SIGNAL PROCESSOR

摘要

PURPOSE:To simplify a killer detection circuit and to attain low power consumption by detecting the presence of a color signal at both recording and reproduction in the state of a low frequency conversion color signal and applying color killer operation based on the result. CONSTITUTION:A signal changeover circuit 17 fetches a recorded low-frequency converting color signal passing through an LPF7 at recording and fetches a low-frequency converting color signal reproduced from an input terminal 1 at reproduction. Only the burst is extracted by a burst gate 13 from the fetched chrominance carrier signal. The extracted burst is subjected to peak level detection by a killer detection circuit 18 or detected synchronously with the low-frequency converting carrier in a frequency fCC from the signal generator 3, and after the result of detection is given to an LPF19, the result is compared with a reference voltage at a comparator 20 and its result controls a killer switch 9 as the discriminating result of the presence of the burst.