| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a video signal synchronization generating device, capable of preventing deterioration in video grade, by improving the probability that an input vertical synchronizing frequency of a video signal and a display vertical synchronizing frequency of a video apparatus synchronize, even when they are different. <P>SOLUTION: The video signal synchronization generating device makes a display reference synchronizing signal Vb becoming a reference of video display and having a first frequency with an input synchronization signal Vi, constituting video and having a second frequency is provided with a frequency ratio generating part 35 for calculating a frequency ratio n, by dividing a frequency double the first frequency by the second frequency; a comparison circuit part 42 for Vx generation for generating a coincidence signal Vx', obtained by equally dividing one cycle of the input synchronizing signal Vi by the frequency ratio n; and a Vx generation circuit part 43 for generating a synchronizing signal Vx, having the same phase as that of the input synchronizing signal Vi by thinning the coincidence signal Vx', each time. <P>COPYRIGHT: (C)2010,JPO&INPIT |
