Patent ID: 6201578
Filing Date: 2001-03-13
Classification: H04N

Abstract:
An apparatus for processing a television signal, in which by applying a control signal to a circuit to be controlled, a signal at least one of a phase and a level of which is controlled is outputted from said circuit to be controlled, said apparatus comprising:A/D converter means which performs an A/D conversion of at least an intermittent reference frequency signal included in said television signal;a first sampling means which samples an output of said A/D converter means with a sampling clock and outputs first sampled data;comparative signal data generation means having a constant level during at least a comparison period;comparison means which compares said first sampled data and said comparative signal data with each other; andcontrol signal generation means which applies the control signal on the basis of an output of said comparison means to said circuit to be controlled during a period of said intermittent reference frequency signal,wherein said comparative signal data generating means includes a second sampling means which samples the output of said A/D converter means and outputs second sampled data having a 180 degrees phase difference with respect to said first sampled data.