| 摘要 |
PROBLEM TO BE SOLVED: To make the size of a graph of superimposed display almost equal even in a reduced screen. SOLUTION: A video signal of a slave screen is fed to a slave screen signal forming circuit 7 through an adder 6 for a superimposed display from an input terminal 5 and the video signal of the slave screen compressed to an optional size is synthesized with a video signal foa master screen from an input terminal 1 through a changeover switch 2. Furthermore, a central processing unit 11 forms a control signal to decide the display size on the slave screen and its position or the like according to a command signal fed toa microcomputer 10. Moreover, a signal from the central processing unit 11 is fed to an on screen display(OSD) means 12 which generates a graphic signal for superimposing display. Then, the setting value of the size and position or the like for display of the signal on the slave screen is recorded and preserved in a random access memory RAM 13, and the setting value is fed through the central processing unit 11 to the OSD 12 which generates a graph so as to be reduced or magnified corresponding to the magnification or reduction of the image on the slave screen. |
