Colour TV luminance and chrominance errors correction - uses circuit generating threshold signal for luminance signal

摘要

An arrangement is used for the modification of the colour difference signals in a color TV receiver. It is able to correct both light density and colour tone errors and gives an enlarged colour reproduction. A circuit is provided to accept the light density signal and to generate a threshold signal, proportional to the light density signal. There is an attenuator circuit which accepts the colour difference signal, and is connected to the threshold signal generating circuit to reduce the gain so as to remove a part of the colour difference signal which exceeds the threshold value.