Video sync validity detector
AssigneeRCA Corporation
InventorKeming J. Chen
Life of this patent
Estimating the term…
Abstract
A video sync validity detector comprises a peak detector circuit and an average detector circuit both responsive to output signals from a sync separator network. Sync representative signals are provided from the output of the peak detector. The average detector is coupled to the peak detector for inhibiting sync representative outputs therefrom in the presence of sync separator output signals representative of false sync signals of average value.
Claims8
In a system for processing a video signal including an image synchronizing component, apparatus comprising:
- an output terminal;
- a sync signal separator responsive to said video signal for providing at an output signals including a separated synchronizing component;
- a peak detector circuit responsive to output signals from said sync separator including said synchronizing component and having an output coupled to said output terminal;
- and
- an average detector circuit responsive to output signals from said sync separator and having an output coupled to said output terminal.
In a system for processing a video signal including an image synchronizing component, apparatus comprising:
- a sync separator responsive to said video signal for providing at an output signals including a separated synchronizing component;
- a peak detector circuit, including a first switching device, responsive to output signals from said sync separator for developing a first output signal in the presence of signals from said sync separator representative of a normally expected synchronizing component, and for developing a second output signal in the absence of said normally expected synchronizing component;
- and
- an average detector circuit, including a second switching device, responsive to the average content of output signals from said sync separator and coupled to said peak detector circuit for causing said peak detector circuit to develop said second output signal in response to signals from said sync separator of an average value representative of an abnormal synchronizing component.
In a television receiver for processing a video signal including an image synchronizing component, said receiver including a signal seeking electronic tuning system;
- apparatus comprising:
- an output terminal;
- a sync signal separator responsive to said video signal for providing at an output signals including a separated synchronizing component;
- a peak detector circuit responsive to output signals from said sync separator including said synchronizing component and having an output coupled to said output terminal;
- an average detector circuit responsive to output signals from said sync separator and having an output coupled to said output terminal;
- and
- means for coupling said output terminal to a control input of said electronic tuning system.
Dependencies are inferred from the claim text.