| 摘要 |
PURPOSE:To simplify synchronization between a reception timing signal and received data by sending synchronizing codes of a transmission timing signal and then by synchronizing the reception timing signal by detecting rise change points of synchronizing codes at a reception side. CONSTITUTION:On reception of transmission request signal 1 from a data terminal equipment, etc., an carrier output from modulator 2 is sent out to transmission line 3. Then, delay switching circuit 4 starts operating and after a certain time for data link establishment between modems passes, gate signal 5 appears at its output. Consequently, synchronizing signal 7 is gated from transmission timing generating circuit 6 so as to obtain gate output 8. By output 8, transmitted data 13 is inputted as transmitted signal S to sample holding circuit 9 and sampled and held as output 9' by sampling pulse 10; and it is modulated by modulator 2 and sent out to transmission line 3. Consequently, the reception timing signal can be synchronized with received data. |
