Patent ID: 8441578
Filing Date: 2013-05-14
Classification: H04N

Abstract:
1. A slicer level calculator used for obtaining a slicer level of an input video signal, wherein the slicer level calculator comprises: a first signal detector used for determining whether the input video signal satisfies a low signal to noise ratio (SNR) criterion and further enabling a low SNR control signal when the input video signal satisfies the low SNR criterion; a moving average calculator used for obtaining a moving average voltage level of the input video signal; a sync-tip voltage sample circuit used for obtaining a sync-tip time information and a sync-tip voltage level of the input video signal; a blanking voltage sample circuit used for obtaining a blanking time information and a blanking voltage level of the input video signal with reference to the sync-tip time information; a slicer level calculator used for obtaining a slicer level according to the sync-tip voltage level and the blanking voltage level; and a rear-end processor used for selectively executing low-pass filtering operation on the slicer level in response to the low SNR control signal.