| 摘要 |
PROBLEM TO BE SOLVED: To obtain an electronic tuner that can automatically select its circuit component in a way of being able to properly tune a television radio wave depending on its electric field strength. SOLUTION: The electronic tuner incorporates a low noise amplifier 32 when the electric field strength of a received television radio wave is weak or automatically closes a switch circuit 20 that short-circuits the low noise amplifier 32 in terms of high frequencies when the electric field strength of a received television radio wave is strong. Thus, the electronic tuner that can automatically select its circuit component in a way of being able to properly tune a television radio wave depending on its electric field strength by means of setting data in advance.
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