Patent ID: 8059199

Claim:
A synchronizing signal detection circuit which generates an output synchronizing signal, based on a synchronizing pulse detected from an input video signal, comprising: detection position predicting means for predicting a detection position of the synchronizing pulse every synchronization cycle peculiar to the input video signal; unnecessary signal eliminating means for supplying the input video signal to a plurality of unnecessary signal eliminating paths in common thereby to eliminate unnecessary signals according to characteristics of the paths every said path, thereby obtaining video signals of every path; detection position acquiring means for extracting synchronizing signals of every path from the video signals and obtaining detection positions of synchronizing pulses of the synchronizing signals, respectively; and output synchronizing signal selecting means for selecting a synchronizing signal of every path at which a difference in time between each of the detection positions of the synchronizing pulses obtained every path and the detection position predicted by the detection position predicting means is minimal and setting the selected synchronizing signal as the output synchronizing signal.