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摘要

PURPOSE:To make the weighting coefficient of a measured signal small, and to improve S/N by changing the weighting coefficient of a summed average according to relative size every time the signal of each time is measured when the sampling values of the same point of time are summed synchronously with a measurement start signal at every number of times of measurement. CONSTITUTION:A weighting coefficient generation circuit 4 inputs sampling values from V11 to V1m to Vn1 to Vnm to a measured sampling value register 5 at every measuring time 1 to (m), and outputs them to a level decider 6. Then, the outputs of the level decider 6 consisting of m-sets of comparators are ANDed by inputting them to a multi-input AND 7. This result is stored at the storing positions A1 to An of every measuring time 1 to (m). At that time, the filter-processed sampling value is inputted further to a weighting circuit 10. An integrator 12 executes integration with every sampling by a set coefficient. After this results are summed by an adder 13, the result is divided by a summed value by a divider 14, and a weighted summed average value 16 is calculated.