| 摘要 |
PURPOSE:To couple easily a computer and a terminal equipment by a pair of cables, to raise a reliability, and to obtain a titled system at a low cost by providing a high-pass filter, a low-pass filter, and a DC-AC power converting part, etc. CONSTITUTION:A high-pass filter 318 makes a wide band components in a receiving signal from a pair of cables 331 for constituting a coupled cable 33 pass through. A low-pass filter 325 fetches a low frequency AC power component in the receiving signal through the pair of cables 331. A DC-AC power converting part 319 converts a DC power from a power source part 210, to an AC power of a low frequency. By providing such filters 318, 325 and the converting part 319, a signal A supplied to a pair of cables 301 from the converting part 319, a signal B supplied to the pair of cables 331 from a key control signal transmitting part 215, and a high frequency digital signal C of a key information signal, etc. can be superposed and transmitted. That is, an electric power of AC and DC, etc., a control signal and an information signal can be superposed and transmitted by a pair of cables. |
