| 摘要 |
An automatic input signal switching circuit of a monitor having a BNC (binary number code) signal terminal and a D-sub (D type-sub miniature connector) signal terminal and a switching method thereof, the circuit having a video signal switch receiving video signals from the BNC signal terminal and the D-sub signal terminal, a video signal processor receiving one of the video signals from the BNC signal terminal and the D-sub signal terminal, the received video signal being selected at the video signal switch, a synchronization signal switch receiving a vertical synchronization signal and a horizontal synchronization signal from the BNC signal terminal and a vertical synchronization signal and a horizontal synchronization signal from the D-sub signal terminal, a detector receiving a detection signal representing a connection state between the D-sub signal terminal and a personal computer, a microcomputer receiving an output of the detector, for generating a control signal, and a switching controller receiving the control signal, for controlling the video signal switch and the synchronization signal switch.
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