| 摘要 |
PROBLEM TO BE SOLVED: To eliminate an interference wave intruding into a digital reception signal. SOLUTION: Caption 1 indicates an antenna receiving a radio wave Pa and caption 2 is a reception section (tuner) selecting a desired channel from the received radio wave Pa. The antenna 1, at the same time, receives a radio wave Pi being an interference wave subject to primary demodulation. Caption 3 is a phase synchronization means that is provided to an output side of the reception section 2 and can be configured with a PLL circuit that locks its phase at a frequency equivalent to the interference wave in a received input signal for example. Caption 4 is a level adjustment means that compares a phase synchronizing signal outputted from the phase synchronization means 3 with the output of a frequency component received by the reception section 2 to adjust the level and gives the signal whose level is adjusted by this level adjustment means 4 to a sbutractor 5. The sbutractor 5 receives a desired channel frequency received by the reception section 2 and eliminates the interference signal component being the disturbing wave from the frequency of the channel.
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