| 摘要 |
PURPOSE:To economize the system by devising the system such that the system employs a conventional noise frequency converter as a reception low noise frequency converter. CONSTITUTION:A conventional noise frequency converter 32 is used for a reception low noise frequency converter. A transmitter 10 uses a frame pattern insert circuit 12 applies frame processing to an output data of a coder 11 to insert a frame pattern for a prescribed period thereby initializing the coder 11 based on the prescribed period and its output data is given to a modulator 13. A receiver 30 detects the frame pattern of the output data of a demodulator 33 to take synchronization thereby initializing an error correction circuit 36 and a phase ambiguous elimination circuit 35 detects a phase slip of a recovered carrier of the demodulator 33 under the control of the frame synchronization circuit 34 and an output demodulation data of the demodulator 33 is given to an error correction circuit 36 based on the negation result. |
