Patent ID: 7286808

Claim:
A broadcast receiving system, comprising: a first antenna receiving a broadcast signal of a first frequency band; a second antenna receiving a signal of a second frequency band different from the first frequency band; a frequency conversion unit converting the signal of the second frequency band into a second signal of the first frequency band; a selection unit selecting one of the broadcast signal output from the first antenna and the second signal output from the frequency conversion unit; and a demodulation unit demodulating said one of the broadcast signal and the second signal selected by the selection unit, wherein the selection unit comprises: a first switch provided between the first antenna and the demodulation unit wherein the first switch is turned ON when the broadcast signal output from the first antenna is selected, and turned OFF when the second signal output from the frequency conversion unit is selected; and a second switch provided between the frequency conversion unit and the demodulation unit wherein the second switch is turned ON when the second signal output from the frequency conversion unit is selected, and turned OFF when the broadcast signal output from the first antenna is selected, wherein said frequency conversion unit is provided to stop frequency conversion operation simultaneously when the second switch is turned OFF, and to start frequency conversion operation simultaneously when the second switch is turned ON, and wherein said demodulation unit has a common input connected to both an output of the first switch and an output of the second switch.