| 摘要 |
PURPOSE:To establish synchronization by a simple circuit on the reception side by using any special signal point concerning the specified phase plane of plural phase planes for transmitting information, detecting this specified signal point on the reception side and establishing synchronization for the combination of phase planes. CONSTITUTION:On a first phase plane (a), 24 signal points are arranged and on a second phase plane (b), 23 signal points are arranged. On a transmission side 10, a ROM 12 outputs bit trains D11 and D12. so that the bit patterns of inputted nine information bits can be corresponding to the combination of each one signal point on the first and second phase planes. A parallel/serial conversion circuit 13 executes parallel/serial conversion from the bit trains D11 and D12 to 6 bit trains, inputs them to a modulator 14 and generates a modulated signal M. On a reception side 20, a demodulator 21 demodulates the received modulated signal and outputs it to a coincidence judgement circuit 22 and a serial/parallel conversion circuit 23. The coincidence judgement circuit 22 outputs a synchronizing pulse F synchronously with a time slot judged as being on the first phase plane and not being on the second phase plane, namely, as containing the 24th signal point among the bit patterns of the inputted bit trains. |
