Patent ID: 6219105
Filing Date: 2001-04-17
Classification: H04N

Abstract:
A video signal processing apparatus comprising:an oscillating unit for outputting a signal of a stable frequency;a counting unit for counting the period of a cycle of a signal supplied from the outside based on the signal output by said oscillating unit;a clock number calculating unit for calculating the number of clocks in a line based on a result of counting by said counting unit;a comparing unit for comparing the number of clocks calculated by said clock number calculating unit with a threshold to decide which is larger;an operating clock number deciding unit for deciding the number of clocks in a next operation by switching to the number of clocks calculated by said clock number calculating unit if the calculated number of clocks is larger than the threshold, or deciding the number of clocks in the next operation by holding the number of clocks in a line in a current operation as it is; anda synchronizing signal generating unit for, based on the number of clocks in operation decided by said operating clock number deciding unit and the signal output by said oscillating unit, generating a synchronizing signal for a video signal.