| 摘要 |
A surveillance system includes cameras, first modems, and a recorder. The camera captures images and outputs video signals. The first modems are connected to the cameras correspondingly and configured for modulation of the video signals from the cameras. The recorder is connected to the first modems. The recorder includes a second modem, an input portion, a processor, and a power supply. The second modem individually connects to the first modems. The input portion, the processor, and the power supply connect to the second modem. The second modern demodulates the modulated video signals from the first modems and sends the demodulated video signals to the processor. The second modern modulates control signals from the input portion and sends the modulated control signals to the first modems. The first moderns demodulate the modulated control signals and send the demodulated control signals to the cameras.
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