327 / | HD | MISCELLANEOUS ACTIVE ELECTRICAL NONLINEAR DEVICES, CIRCUITS, AND SYSTEMS |
1 | DF | SPECIFIC SIGNAL DISCRIMINATING (E.G., COMPARING, SELECTING, ETC.) WITHOUT SUBSEQUENT CONTROL {11} |
50 | DF | .~ By amplitude {9} |
58 | DF | .~.~ Maximum or minimum amplitude {4} |
61 | .~.~.~ By diode-capacitor network |