VIDEO SIGNAL SWITCHING DEVICE

• Main Author: FUJIOKA FUMIO
• Format: Patent
• Language: English
• Published: 29.07.1992
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; PICTORIAL COMMUNICATION, e.g. TELEVISION

PURPOSE:To obviate the generation of a disturbance in a screen by imparting the signals of a specific pattern to the screen boundary part of an asynchronous video signal and executing a phase adjustment so as to attain specified intervals when the signals are not at the specified intervals. CONSTITUTION:The video signals inputted to input signal terminals 1 of respective channels are digitalized by an A/D converter 12 of the present system. An intrinsic pattern is then inserted into the part of, for example, the vertical flyback time of the video signals by an intrinsic pattern converting section 13. One of thereof is selected on a signal reception side and a light signal receiver 5 converts this light signal to an electric signal and outputs the signal to a synchronous phase correcting circuit 15. The synchronous phase is corrected in such a manner that the periods of the synchronizing signals attain the specified interval through the synchronous phase correcting circuit 15 and thereafter the prescribed intrinsic pattern is removed by an intrinsic pattern removing circuit 16. This part is returned to the ordinary synchronizing signal. The signal is then converted to an analog signal by a D/A converter 17 and is outputted after decoded to the video signal.