IMAGE SIGNAL PROCESSING SYSTEM

摘要

PURPOSE: To provide a video signal processing system having chromaticity- modulated carrier signals modulated by making phase-alternating carrier signals and chromaticity carrier signals to respond to chromaticity carrier signals having a phase difference of 180 deg. on alternative scanning lines and modulating first auxiliary signals on the phase-alternating carrier signals, and then, adding the phase-alternating carrier signals to the chromaticity carrier signals modulated at a give phase angle. CONSTITUTION: An oscillating section 16 is fixed to a multiplexer(MUX) 20 and a 180 deg.-phase shifter 22 in chromaticity and burst and outputs a 3.58MHz CW (at 0 deg. phase). A video signal supplying source 10 is connected to a synchronizing separation section 24 which generates a horizontal synchronizing signal H and a burst gate on a passage 25 and the signal H is impressed upon a 1/2-frequency dividing circuit 26 and provides a horizontal signal (H/2) used for controlling the MUX 20. A 1-H coamed first auxiliary signal (AUXI) passed through a low-band filter and supplied from a signal supplying source 32 is modulated by one phase of PAC at the output end of an LUT 30 by means of a modulator 34 connected to one input of an adder 36.