| 摘要 |
PROBLEM TO BE SOLVED: To automatically adjust a signal level by a simple structure so as to perform continuous switching by adjusting an input signal to be equal in size to that of a reference input signal. SOLUTION: A selecting means 24 selects one from a plurality of input signals and outputs the selected signal. A comparing means 23 compares the sizes of input signals with one of the input signals of the selecting means 24 as a reference. Storing means 25 to 27 hold the comparing result of the comparing means 23. Control means 28 to 30 control starting/stopping of storing performed by the storing means 25 to 27. In an adjusting means 22, the sizes of the other input signals are adjusted so as to be equal to that of the input signal as a reference based on the outputs of the comparing means 23 held by the storing means 25 to 27. Thus, continuous switching is automatically performed by a simple structure without making an instrumentation system complex, increasing its size or producing any level differences in outputs during switching.
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