| 摘要 |
<p>PROBLEM TO BE SOLVED: To strengthen a supervision function of a unit device of a head end device. SOLUTION: Each of a re-transmission device such as an input branching device and a TV signal processor and a unit device 1 such as a TV modulator, a pilot signal generator, an output mixer and an output amplifier being components of the head end is provided with a signal, level supervisory function 2 that monitors a level of both or one of signals received and outputted and the head end is provided with a supervisory equipment 3 that monitors the normality of the unit device 1 based on information of the signal level detected by the signal level supervisory function 2 of the unit device 1.</p> |
