| 摘要 |
PROBLEM TO BE SOLVED: To provide video communication equipment which can readily realize a countermeasures against EMI by reducing unwanted radiation, when FM video signals are transmitted after being amplified. SOLUTION: This video communication equipment separates a horizontal synchronizing signal from a composite video signal outputted from a camera 4 of a slave machine 1, generates a gate pulse by delaying the pulse by a fixed period of time from the synchronizing signal, causes a dummy signal to be passed through by means of a gate circuit 11, and superimposes the dummy signal upon the back porch portion of the video signal by means of a mixer 5. After conducting FM modulation and amplification on the video signal, the communication equipment transmits the FM-modulated and amplified video signal to a master machine 2 from a transformer 7, for converting unbalanced/ balanced signal via a two-wire type transmission line 3. Upon receiving the FM-modulated video signal, the master machine 2 demodulates the signal into the original video signal by giving the signal to an FM demodulator 13 via a transformer 13 for converting balanced/unbalanced signal and displays the demodulated signal on a monitor 15.
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