| 摘要 |
The device processes a security remote control, remote prescription, and information of subscriber home. The system includes a coupler (300) which transfers unaudible frequency with in phase to subscriber line, a line multi connection device (200) which analyses unaudible frequency characteristics, a line state detector which outputs hook on/off signals, a controller which generates 3 audible tone data, and analyses unaudible tone data, an audible frequency generator which outputs a 1st audible frequency, an audible frequency detector which converts audible frequency into audible tone data, an unaudible frequency detector which converts unaudible frequency into unaudible tone data, a coupler communication unit which executes modem communication.
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