| 摘要 |
PROBLEM TO BE SOLVED: To transmit two pieces of information with one channel by encoding an input source to be transmitted to a PN code (pseudo noise code) and transmitting it. SOLUTION: A stage for encoding two pieces of channel information to be transmitted to the PN code and a stage for adding encoded information to a modulo two adders and transmitting it to a reception side as one channel are provided. When a new symbol obtained by combining the symbols of a channel X (302) and a channel Y (303) is transmitted, information on the two channels can simultaneously be transmitted to one channel. Furthermore, even parities are automatically given to combined information since the number of '1' is always even by the characteristic of the PN code. When a PN code generator to be used is not known, the restoration of information becomes impossible and the secrecy of information can be obtained. |
