| 摘要 |
PROBLEM TO BE SOLVED: To provide an analog signal processing circuit capable of controlling the level of an input analog signal and controlling the input impedance. SOLUTION: A level controller 106 is arranged with one terminal of a first resistant component 112 being connected electrically to an input terminal 102, while the other terminal of the first resistant component 112 is electrically connected to one terminal of an input impedance component 124 in a signal input circuit 108. A second resistant component 114 electrically connects one terminal or other terminal of the first resistant component 112 with the ground. When a line switching part 116 switches a line, through which an analog signal is passed, to a line provided with the first resistant component 112, an analog signal attenuated to 1/p fold appears at the other terminal of the first resistant component 112. In an input impedance control part 104, one terminal of a third resistant component 120 is connected to the ground. By electrically connecting or disconnecting the other terminal of the third resistant component 120 and one terminal of the first resistant component 112, the input impedance of an analog signal processing circuit 100 can be controlled.
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