Wolf, Greenfield & Sacks, P.C.
Apparatus for detecting the amplitude and phase of an a.c. signal
 An apparatus for detecting the amplitude and phase of an a.c. signal detects the a.c. signal with signal detection means (4), calculates an a.c. signal that is phase-shifted by the amount of the phase characteristic .phi. of the calculation circuit (14) at the frequency of the detected a.c. signal, multiplies the detected a.c. signal by cos .phi., and multiplies by 1/sin .phi. the multiplication result subtracted by the phase-shifted a.c. signal. 
Mitsubishi Denki Kabushiki Kaisha
G G G
G01R G01R G01R
inventional inventional inventional
Toshiyuki Shinzo Hatsuhiko Naohiro
Fujii Tamai Naitoh Toki