Analog-digital signal mixing transmission device
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United States of America Patent
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Jul 17, 2018
Grant Date -
Jun 14, 2018
app pub date -
Jun 23, 2016
filing date -
Jul 8, 2015
priority date (Note) -
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Abstract
A plurality of terminal devices 3 are connected to a parent device 1 to measure analog voltages of the terminals. Reference voltages 6 and measurement voltages 7 each having a polarity reverse to that of clocks are sequentially switched to be connected at gaps of clocks supplied by the parent device 1. Thus, the reference voltages 6 and the measurement voltages 7 of the terminal devices 3 are directly connected. With this mechanism, measurement of analog measurement signals at multiple points can be performed by use of a pair of electric wires, in which errors due to voltage drops of the measurement voltages 7 over the transmission line 2 are corrected with measurements of the reference voltages 6 whose voltage is known in advance so that precise analog measurements can be performed.
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