| 摘要 |
Method and apparatus for transmitting messages between communication devices via a communication channel allowing at least voice messages to be transmitted, the messages including data subdivided in a sequence of basic data units, the method including: a) encoding the basic data units as unique signals (us<SUB>j</SUB>) including a predetermined number of basic signals (b<SUB>i</SUB>), each basic signal having a unique fixed frequency (f<SUB>i</SUB>); b) transmitting a sequence of unique signals (us<SUB>j</SUB>) during a sequence of fixed time periods (t 1 , t 2, t 3 , . . . ); c) receiving and decoding the sequence of unique signals (us<SUB>j</SUB>) into the sequence of basic data units; the data being transmitted in superposition over voice. |
