327 / | HD | MISCELLANEOUS ACTIVE ELECTRICAL NONLINEAR DEVICES, CIRCUITS, AND SYSTEMS |
1 | DF | SPECIFIC SIGNAL DISCRIMINATING (E.G., COMPARING, SELECTING, ETC.) WITHOUT SUBSEQUENT CONTROL {11} |
2 | DF | .~ By phase {1} |
3 | DF | .~.~ Comparison between plural inputs (e.g., phase angle indication, lead-lag discriminator, etc.) {5} |
7 | DF | .~.~.~ With reference signal {4} |
10 | .~.~.~.~ Uniform pulse waveform |