| 摘要 |
PROBLEM TO BE SOLVED: To provide a carrier reproduction circuit capable of speedily and highly precisely performing carrier reproduction of a received signal. SOLUTION: This carrier reproduction circuit has a complex multiplication circuit 53 detects difference between the received signal and a signal feedbacked in a costas loop circuit 40 and generates a 1st signal, a loop filter circuit 55 which uses a 1st integration loop including a 1st delay circuit performing delay for one symbol, processes the 1st signal and generates a 2nd signal and an NCO circuit 56 which feedbacks a signal generated by processing the 2nd signal by using a 2nd integration loop including a 2nd delay circuit performing delay for one symbol toward the circuit 53, and switches the circuits 55 and 56 into their states ahead of by twelve symbols in accordance with a TMCC detection signal S106a. |
