Patent ID: 7436456

Claim:
A method for synchronising time bases of a first video device which transmits a video signal comprising image information and synchronisation information and of a second video device which receives said composite video signal, comprising the steps of; a) extracting synchronisation information from the video signal received by the second video device and from the time base of the second video device; b) determining a phase difference between the video signal received by the second video device and the time base of the second video device based on said extracted synchronisation information; c) transmitting control information of a first type representative of the amount of said phase difference to said first device; d) switching, in said first device, the phase of the video signal by a phase angle represented by said first type control information, wherein the first type control information is a binary data word having a predefined number n≧2 of bits; e) determining the first type control information and a second type control information such that the sum of phase differences represented by said first and second type control information is the phase difference determined in step b); f) transmitting the second type control information to said first device; and g) applying a phase shift as represented by said second type control information to the video signal in said first device.