| 摘要 |
PURPOSE:To eliminate the synthetic band component of a disturbing wave arriving with a band width by synthesizing the signal which underwent in-phase synthesization with the vector sum signal of the disturbing wave at the reception part of a TV broadcasting device. CONSTITUTION:The vector sum signals SIGMAU of disturbing waves of two antennas are applied to an in-phase synthesizer 11. While the vector difference signal DELTAU of said disturbing waves is applied to a 90 deg. phase shifter 12. The signal DELTAU is also sent to a 180 deg. distributor 13 after the 90 deg. phase shifting. The vector sum signal of the in-phase disturbing waves is sent to an amplitude controller 14, and the 180 deg. phase-shifted signal is supplied to a tilt circuit 15. The controller 14 functions to set the ratio between the output DELTAU0 of an in-phase synthesizer 16 and the signal SIGMAU at (m). The circuit 15 gives a tilt to the frequency characteristics to deliver the vector DELTAU2 of the disturbing wave and sends the vector difference DELTAU0 of the in-phase synthesization to the synthesizer 11. As a result, the output DELTAU0 of the signal DELTAU is equal to the value obtained by adding the signal DELTAU to the signal SIGMAU in an adverse phase and after multiplying the signal DELTAU by (m) times.
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