| 摘要 |
PURPOSE:To reduce the white noise, by weighting the phase difference between a correction signal and a reference signal in accordance with the amplitude difference between both signals and by controlling the carrier phase by this weighting value. CONSTITUTION:A phase difference detecting part 9 of the general carrier phase automatic control circuit is amended, and an input signal 1 is multiplied by the output from a trigonometric function generator 3 to correct the carrier phase of the input signal in accordance with a value indicated by the feedback signal, and a reference signal to which this correction signal corresponds is discriminated by a discriminating part 13, thus obtaining the corresponding reference signal. The phase difference between the correction signal and the reference signal is obtained by multipliers 14 and 16 or the like and adder and subtractors 15 and 20 or the like and is so weighted that the weight is large for a small amplitude difference between both signals and is small for a large amplitude difference, and this value theta'3 is fed back to a complex multiplier 2 through an integrating circuit 11 and the trigonometric function generator 3, thus controlling the carrier phase automatically. |
