| 摘要 |
PURPOSE: To provide a combination tuner which selects the reception antenna of an FM signal according to the reception electric field intensity of the FM signal and always reproduces the FM signal in a satisfactory state. CONSTITUTION: The tuner is provided with first signal reception parts 1 and 3 for receiving TV signals and the FM signals, second signal reception parts 2 and 4 for receiving the FM signals, signal selection parts 5 and 6 for selecting the reception signals of the first signal reception parts 1 and 3 and the reception signals of the second signal reception parts 2 and 4, high-frequency selection amplifying parts 7 and 8 selecting and amplifying the received signals, frequency conversion parts 10 and 11 converting an amplified high frequency signal into an intermediate frequency signal, intermediate frequency selecting/amplifying parts 12 and 13 selecting and amplifying the intermediate frequency signal and a switch circuit 15 switching the selection of the TV signal or the FM signal by three-mode band data. The switching circuit 15 selectively turns on/off transistors 151 to 153, so that they select the TV signals of one of the first signal reception parts 1 and 3, the FM signals of the second signal reception parts 2 and 4 and the FM signals of the first signal reception parts 1 and 3 by the mode state of the band data.
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