Patent ID: 7176979
Filing Date: 2007-02-13
Classification: H04N

Abstract:
1. A synchronization pulse detector, comprising: a shape detector for processing samples of an input signal having a synchronization pulse and a plurality of non-synchronization pulses to determine whether such samples have a predetermined sequence; said predetermined sequence being a first, non-time varying portion, followed by a first, time-varying portion, followed by a second, non-time varying portion, followed by a second, time-varying portion, followed by a third, non-time varying portion, one of the first and second, time-varying portions having a positive slope and the other one of the first and second, time-varying portions having a negative slope; wherein the slope of the time varying portions are determined by comparing said input signal to a specified criterion based in part of the various slope requirements for the time varying portions a time window for determining whether said samples are produced at a predetermined rate expected for the series of synchronization pulses; and a voltage window for determining whether an average value of one of said second time-varying portions is substantially lower or the same as, but not higher than a lowest DC value detected within the time-equivalent of a segment of video.