| 摘要 |
PURPOSE:To eliminate necessity of an image distributor by driving plural automatic image switching circuits by one timing pulse generating circuit and supplying video signals from plural cameras to automatic image switching circuits in parallel. CONSTITUTION:It is supposed that a remote controlling device is operated in a monitor NO.1 side, and commanded to fix a projected image to the image of a camera NO.2. Thereby, a selection signal is inputted to a switching circuitNo.1 from a signal line corresponding to the camera NO.2 out of selection signal input lines of the monitor NO.1 system. The switching circuit NO.1 stops image switching of the camera so far made automatically temporarily, and outputs video signals from the camera NO.2 to an output signal line 6 to the monitor NO.1 system at all times. Accordingly, the image of the monitor NO.1 is fixed to the image projected by the camera NO.2. On the other hand, in the switching circuit NO.2, automatic switching of image is made by a pulse from a timing pulse generating generating circuit 3 regardless of operation of the switching circuit NO.1.
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