| 摘要 |
PURPOSE:To prevent the oscillation and to stabilize the system, by synthesizing the output signal of transversal filter and the intermediate frequency input signal in parallel. CONSTITUTION:The amplitude change of signal at the intermediate frequency stage is detected at the amplitude detector 6 and instantaneous frequency displacement of signal is detected at the frequency discriminator 4 and this is input to the calculation circuit 7. Further, the calculation circuit 7 calculates the reflection coefficient, and delay time of reflection waves and the phase difference between the direct wave and the reflection wave at the carrier frequency based on the input. Further, the weighting circuit 9 changes the amplitude of the tap output signal of the tapped delay circuit 8 at the intermediate frequency signal based on the result of calculation. Further, the output signal of the weighting circuit 9 and the intermediate frequency input signal are synthesized in parallel at the synthesis circuit 2. |
