Patent ID: 8937684
Filing Date: 2015-01-20
Classification: H04N

Abstract:
1. A voltage level control circuit, for controlling a target slicing voltage level used to slice a video signal by a target circuit, the voltage level control circuit comprising: a slicing circuit, for slicing the video signal by sequentially adopting a plurality of slicing voltage levels to correspondingly generate a plurality of first clock signals; a detection circuit, for respectively detecting a plurality of phase differences between the first clock signals and a plurality of second clock signals to generate a plurality of detection signals; an oscillating circuit, for generating the second clock signals according to the detection signals, respectively; and an adjusting circuit, determining whether to adjust the target slicing voltage level according to the detection signals corresponding to the slicing voltage levels, wherein the video signal is a composite video blanking sync signal, and wherein the target slicing voltage level is for slicing horizontal synchronization signal components of the composite video blanking sync signal.