| 摘要 |
PROBLEM TO BE SOLVED: To reduce the size of a receiver and the cost by selecting a CS 1st intermediate frequency signal (CS signal) from a communications satellite(CS) reception antenna and a BS 1st intermediate frequency signal (BS signal) from a broadcast satellite(BS) reception antenna so as to simplify the configuration of the receiver. SOLUTION: A 1st changeover circuit 1 selects digital satellite broadcast signal, a CS signal S1 or a BS signal S2 from a CS reception antenna and a BS reception antenna, and the selected signal is given to a channel selection section 2. The channel selection section 2 provides an output of the 1st intermediate frequency signal as a 2nd intermediate frequency signal with a prescribed frequency. A required band component of the 2nd intermediate frequency signal passes through a band-pass filter BPF3 and an IF processing section 4 applies prescribed processing such as automatic gain control or the like. A QPSK demodulation section 5 demodulates transmission original data Dc from the CS signal and an octal phase PSK demodulation section 6 demodulates transmission original data Db from the BS signal. The demodulation output is selected by a 2nd changeover circuit 7 in interlocking with the 1st changeover circuit 1.
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