Patent ID: 6130718
Filing Date: 2000-10-10
Classification: H04N

Abstract:
Method for correcting errors in synchronization in operations of recovering sequences of ancillary data transmitted in lines of the VBI of a video signal having a vertical synchronization signal Vsync and a horizontal synchronization signal Hsync, used for synchronising the opening of time windows for recovering the data, an artificial synchronization pulse being generated in the event of absence of a horizontal synchronization pulse at the end of a period equal to H+.DELTA.H, where H is the period of the signal Hsync and .DELTA.H is a first predetermined lapse of time, .DELTA.H being small compared to H and comprising the steps of:generating the artificial synchronization pulse; andshifting the moment of opening of the window for recovering ancillary data to the moment of generation of the artificial synchronization pulse so as to cause the moment to coincide with the start of the sequence of ancillary data to be recovered.