| 摘要 |
PURPOSE:To eliminate an FM signal interference wave, by shifting the phase of an FM carrier, adjusting the amplitude to be equal to the amplitude of the interference wave and subtracting the amplitude from the original FM carrier. CONSTITUTION:The phase of an FM carrier yl is shifted via a limiter 7 according to control inormation Z(t) of the phase shift selectively read out from a read- only memory 9. The signal is led to an attenuator (ATT)10 in which a relative amplitude (a) is set, the amplitude is adjusted to be equal to the amplitude of an FM signal interference wave U, the result is given to a subtractor (SUB)11, where it is subtracted from the original FM carrier (y) not subjected to the phase and amplitude adjustment and demodulated via a limiter 12 and a frequency discriminator (DISC)13. The phase shift Z(t) given through the combination of the amplitude (a) and the amplitude component W is stored in addresses indicated with the said amplitude (a) and the amplitude component W respectively in the read-only memory 9. |
