| 摘要 |
PURPOSE:To always maintain a satisfactory receiving state by switching plural antennas whose directivity is different, in accordance with a receiving state. CONSTITUTION:Now, when receiving by the antenna 7, if influence of multi-path appears in the output waveform due to unsuitable directivity and a noise component appears, the output is transferred through the high-pass filter 121, the amplifier 122, the detector 123, and the bistable multivibrator circuit 125, and the switching control signal is provided to the switching means 10. The switching means 10 switches the antenna 7 to 8 in response to the switching control signal. When the receiving antenna 8 detects a multi-path noise once again, it is switched to the antenna 7 in the same way. |
