| 摘要 |
PROBLEM TO BE SOLVED: To eliminate a sum signal without the use of a filter. SOLUTION: An output signal 13 of a measured signal source 11 and an output signal 14 of a reference signal source 12 are multiplied by a multiplier 19, a signal 16 resulting from phaseshifting the output signal 13 by -90 deg. and a signal 18 resulting from phase-shifting the output signal 14 by +90 deg. are multiplied by a multiplier 20, the output signals 16, 14 are multiplied by a multiplier 21, and the output signals 13, 18 are multiplied by a multiplier 22. An adder 27 obtains a difference signal between an output signal 23 of the multiplier 19 and an output signal 24 of the multiplier 20, and the difference is given to an integration device 31. An adder 28 obtains a subsignal between an output signal 25 of the multiplier 21 and an output signal 26 of the multiplier 22, and the sum is given to an integration device 32. |
