| 摘要 |
<p>PROBLEM TO BE SOLVED: To transmit/receive low speed data in a low band link and high speed data in a high band link by installing a means modulating a low band signal string and a high band signal string, putting together the modulated low band signal string and the modulated high band signal string and generating a transmission signal. SOLUTION: The transmission/reception device is constituted of a modulation/ transmission part and a demodulation/reception part. The duplex links of mutually independent high band and low band are provided. High speed data such as a packet and a multiframe are transmitted through a high band link Rb and low speed data such as general telephone service and a general information communication network signal are transmitted through a low band link Ra. At that time, the modulation/ transmission part separates general telephone service and the signal of a general information communication network in the low band and the packet and the multiframe of the high band and resolves them into the number (r) of keys decided by a key allocation part 35 and 255-r-pieces of different partial signals. They are modulated and a transmission signal X[n] is generated.</p> |
