| 摘要 |
PURPOSE: To make the tuner small and to reduce the cost by using a digital demodulator demodulating a voice signal in common between a satellite broadcast tuner and a UHF/VHF tuner. CONSTITUTION: The tuner is provided with a 1st intermediate frequency signal amplifier 2 for satellite broadcast, a UHF/VHF signal high frequency amplifier 8, a 1st mixer circuit 3 converting a frequency of a satellite broadcast signal into an intermediate frequency, a 2nd mixer circuit 9 converting a frequency of the UHF/VHF signal into an intermediate frequency, a 1st SAW filter 4 for satellite broadcast, a 2nd SAW filter 10 for UHF/VHF, a demodulator 5 FM demodulating the satellite broadcast signal, a demodulator 6 demodulating the video signal of the satellite broadcast subject to FM demodulating, a demodulator 11 for the UHF/VHF video signal, a digital demodulator 12 demodulating the satellite broadcast and the UHF/VHF audio signal, and a microcomputer 13 selecting the audio signal and conducting channel selection.
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