| 摘要 |
an A/D converter(4) performing A/D conversion of the signal converted into a base band signal in a tuner amplifier(1) and an IF amplifier(2); a data segment Sync detector(5) outputting the mode selection signal(39) determining Up/Down Mode by detecting the synchronization signal from the A/D converted signal and judging the size of the synchronization signal and the enable signal(40) controlling the gain control; and a gain control signal controlling means(3) controlling the gain of the tuner amplifier(1) and the IF amplifier(2) according to the signal outputted from the data segment Sync detector(5).
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