| 摘要 |
PURPOSE:To suppress a carrier signal within the band of an analog information signal precisely by adding simple constitution. CONSTITUTION:A carrier signal component is extracted by a narrow-band pass filter 1 from a received signal inputted to a terminal 1N and a signal synchronized with the carrier signal component is outputted from a PLL circuit 2 and applied to a subtractor 3 through a voltage control phase shifter 4 to subtract the carrier signal component from the received signal. A remaining carrier signal included in an output of the subtractor 3 is extracted by a narrow-band filter 5 and detected by an envelope detector 6 and the detected output is compared by a voltage comparator 8 with that passed through a delay circuit 7. The compared output is multiplied by the detected output in a multiplier 9, the multiplied output is applied to an adder 11 to add it to offset compensating bias voltage from a bias terminal 12 and the added output is applied to the voltage control phase shifter 4 as control voltage. |
