| 摘要 |
PURPOSE:To shorten pull-in time by estimating normal phase error according to the output signal of an amplifier in a first-order loop when a burst signal arrives at a carrier reproducing part, and forcedly operating a control voltage to be supplied to a voltage controlled oscillator reproducing the carrier. CONSTITUTION:A control voltage supplying means 40 is equipped with a control circuit 41 to execute phase locked control and to output a control signal CO while receiving a third filtered signal LF 3 and a switch control signal SR, adder 42 to add the control signal CO and a loop voltage LV and to output an added result signal, and fourth low-pass filter 43 to supply a control voltage CV to a voltage controlled oscillator 11 while receiving the added result signal after removing the noise to be generated when switching a loop forming circuit from the first-order loop to the second-order loop. Thus, after switching from the first-order loop to the second-order loop, the pull-in time j shortened. |
