| 摘要 |
PROBLEM TO BE SOLVED: To supply a satellite signal desired respectively by users of a plurality of tuners to each tuner without the individual provision of a changeover device to the turners although the satellite signal is converted into intermediate frequency signals whose frequency bands are partialy overlapping. SOLUTION: Four satellite signals sent from two geostationary satellites are fed to mixers 42, 44, 46, 48 placed in one case. The mixers 42, 44, 46, 48 frequency-convert the satellite signals into satellite intermediate frequency signals whose frequency bands are at least partialy overlapping. A changeover switch 56 placed in the case is connected between the mixers 42, 44, 46, 48 and two output terminals 78, 80 provided in the case and supplies the satellite intermediate frequency signal selected by a control voltage separately applied to the output terminals 78, 70 to the output terminals to which the control voltage is applied. |
