| 摘要 |
PROBLEM TO BE SOLVED: To provide a carrier signal reproducing circuit capable of reducing frequency errors due to the difference in phase shift points for respective data generated when demodulating of phase modulation signals by an ACT(adaptive carrier tracking) system. SOLUTION: In this carrier signal reproducing circuit 3 provided with a phase shift circuit 4, a frequency control circuit 5 and an NCO circuit 6, a shift amount correction circuit 7 is provided. At phase correction of specified data, a phase shift amount is corrected, and the frequency error between the data is distributed symmetrically with respect to input signal frequency. Thus, errors which depend on the data of a carrier frequency generated in the ACT demodulation of the phase modulation signals are reduced. |
