Video device and method for synchronising time bases of video devices

摘要

A video system comprises a first video device (1) which transmits a video signal (CVSC) comprising image information and synchronisation information and a second video device which receives said composite video signal (CVSC). The second device has a time base (21). For synchronising the two devices a) synchronisation information ( PHI IC, PHI LC; PHI IM, PHI LM) is extracted from the video signal (CVSC) received by the second video device (2) and from the time base (21) of the second video device (2); b) a phase difference ( DELTA PHI I, DELTA PHI L) between the video signal (CVSC) received by the second video device (2) and the time base (21) of the second video device (2) is determined based on said extracted synchronisation information ( PHI IC, PHI LC; PHI IM, PHI LM) ; c) control information ( DELTA PHI I) of a first type representative of the amount of said phase difference is transmitted to said first device (1); and d) in said first device (1) the phase of the video signal (CVSC) is switched by a phase angle represented by said first type control information ( DELTA PHI I). <IMAGE>