US PATENT SUBCLASS 327 / 7
.~.~.~ With reference signal

Current as of: June, 1999
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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.~.~.~ With reference signal {4}
8  DF  .~.~.~.~> With varying frequency
9  DF  .~.~.~.~> With sampling
10  DF  .~.~.~.~> Uniform pulse waveform
11  DF  .~.~.~.~> With transformer

DEFINITION

Classification: 327/7

With reference signal:

(under subclass 3) Subject matter wherein a signal of fixed phase acts as a constant for comparison to a variable input.

(1) Note. The reference signal is usually an input signal or produced from an input signal.

SEE OR SEARCH THIS CLASS, SUBCLASS:

42, for frequency comparison between a fixed reference frequency and a variable input.