Patent ID: 7796193

Claim:
A video signal processing system for slicing binary data transmitted in a video signal, comprising: a synchronous separator detecting Hsync and Vsync carried in the video signal; a line counter generating a first enable signal by counting the number of scanning lines based on the detected Hsync and Vsync, wherein the first enable signal is active when the video signal carrying teletext and/or other binary data; a slicing signal generator comprising: an extreme value detector determining local maximum values and local minimum values of the video signal; a NOR gate receiving the local maximum values and the local minimum values from the extreme value detector for generating a second enable signal; a switch unit receiving the second enable signal and the video signal; and a slicing level determiner generating an adaptive slicing signal based on the local maximum values and the local minimum values; wherein the switch unit only passes the video signal to the slicing level determiner when the second enable signal is active, thereby the slicing level determiner receives values not determined as the local maximum values or local minimum values; and a comparator enabled by the first enable signal to compare the video signal with the slicing signal.