VIDEO SIGNAL PROCESSOR

PROBLEM TO BE SOLVED: To solve the problem of occurrence of frame deviation in displayed video, resulting in the video with discomfort if a plurality of video signals, synchronized with each other, fall in out of synchronization even a single time while a plurality of video signals are displayed on a single display device. SOLUTION: A memory means writing circuit 11 writes, in parallel, animation signals of four channels inputted parallel into banks of four memory means 13-1 to 13-4 for each channel. A bank that performs writing of memory means 13-1 to 13-4 is changed to the next one from the current one each time a synchronous signal detecting signal is supplied that is outputted when the vertical synchronous signal is detected by a synchronous signal detecting circuit 12. If disturbance occurs in the synchronous signal due to noises and a false vertical synchronous signal is detected by the synchronous signal detected circuit 12, the video signal on and after the disturbance occurs is written in the next bank instead of a bank being written in the memory means 13-1 to 13-4. COPYRIGHT: (C)2007,JPO&INPIT