| 摘要 |
PROBLEM TO BE SOLVED: To improve the compatibility in the design of layout of components and a mount volume or the like between a conventional BS receiver and a KU band (or C band) exclusive BS receiver in the DBS tuner for receiving satellite broadcast programs. SOLUTION: A signal selection circuit or an inverting circuit is provided to an output terminal of an FM demodulator built in the DBS tuner 3 and the signal selection circuit or the inverting circuit is controlled depending on the polarity of an input signal fed to the FM demodulator 4 and the polarity of the signal outputted from the signal selection circuit or the inverting circuit is controlled at all times to be constant and the result is fed to a post-stage signal processing system circuit.
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