Sync detector having noise adjusted slice level
First Claim
Patent Images
1. Sync separator circuit for receiving a video signal and providing a sync signal recovered therefrom wherein said video signal includes predetermined nonpicture portions containing sync signal information and comprising:
- noise detector means responsive to said video signal during said non picture portions thereof for providing a noise signal having a magnitude representative of the average noise level on said nonpicture portions thereof;
sync slicer means for comparing said video signal with a slice level signal and providing said sync signal in dependence upon said comparison;
means for providing said slice level signal; and
means responsive to said noise signal for varying the magnitude of said slice level signal as a function of noise on said predetermined nonpicture portions of said video signal.
4 Assignments
0 Petitions
Accused Products
Abstract
A sync detector is provided for recovering or extracting a sync signal from a video signal. The circuitry includes a slice level comparator for comparing the video signal against a slice level signal for providing a sync signal in dependence upon the comparison. The slice level signal is adjusted as a function of noise measured during a nonpicture portion of the video signal.
-
Citations
10 Claims
-
1. Sync separator circuit for receiving a video signal and providing a sync signal recovered therefrom wherein said video signal includes predetermined nonpicture portions containing sync signal information and comprising:
-
noise detector means responsive to said video signal during said non picture portions thereof for providing a noise signal having a magnitude representative of the average noise level on said nonpicture portions thereof; sync slicer means for comparing said video signal with a slice level signal and providing said sync signal in dependence upon said comparison; means for providing said slice level signal; and means responsive to said noise signal for varying the magnitude of said slice level signal as a function of noise on said predetermined nonpicture portions of said video signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
Specification