| 摘要 |
PROBLEM TO BE SOLVED: To prevent the phenomenon that local oscillation signals leak from one system to the other system and to prevent the decline of a reception performance due to the leakage of the local oscillation signals into the other system, such as the deterioration of phase noise. SOLUTION: When setting the oscillation frequency band of local oscillators 15 and 35 on the band side higher than the frequency band of digital television signals, low-pass filters 20 and 40 for turning the frequency band of the local oscillation signals to a block band are interpolated between lines 23-25 and 43-45 connecting first and second direct conversion circuits 10 and 30 and a distributor 1, and leakage local oscillation signals generated on the line 23 or 43 accompanying the oscillation operation of the local oscillator 15 or 35 of one system are blocked from flowing into the direct conversion circuit 10 or 30 of the other. COPYRIGHT: (C)2007,JPO&INPIT
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