| 摘要 |
A video signal of a main screen is supplied from an input terminal ( 1 ) through a change-over switch ( 2 ) and an RGB drive circuit ( 3 ) to an image receiving tube ( 4 ). The video signal of a sub screen is also supplied to a sub screen signal production and control circuit ( 6 ) through an input terminal, compressed to an arbitrary size, and derived at an arbitrary positional timing to thereby produce the video signal of the sub screen. A command signal from a commanding unit is further supplied to a microcomputer ( 9 ) through an input terminal ( 8 ). In the microcomputer 9 , the command signal mentioned above is supplied to a central processing unit (CPU) ( 10 ). The central processing unit produces a control signal indicating the displayed position of the sub screen or the like. In a part of the processing, the similarity and/or non-similarity of operation buttons is judged and a response time of the control is determined, whereby the actions can be carried out smoothly.
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