Noise reduction circuit for image signal and image displaying system.

摘要

A noise reduction circuit for an image signal in which characteristics of first and second filters are set in such a way as their overall characteristic becomes flat so as to reduce a noise overlapping a high frequency range of a video signal and, further, connected to an image displaying system for displaying a high definition image as well as an image in accordance with the present television system by switching over in which a synchronizing signal generator provides a phase difference between synchronizing signals to be supplied to a first and second video equipments for compensating a delay time of the high definition television signal encountered in an image dividing unit, whereby the high definition television signal a Hi-vision signal and the present television signal is an NTSC television signal.