(under subclass 75) Subject matter wherein the "signal feedback circuit means" has an amplifier therein, as defined in the class definition, which may have bias control means.
SEE OR SEARCH THIS CLASS, SUBCLASS:
86, for amplifiers having a variable impedance in a signal feedback path varied by a separate control path.
96, for amplifiers having signal feedback combined with means to control the bias of an electrode in the signal amplifier.
129+, for amplifiers having control of the input electrode or
gain control electrode bias. See the search notes thereunder.
144+, for amplifiers having a variable impedance for the signal channel controlled by a separate control path. See the search notes thereunder. SEE OR SEARCH CLASS
329, Demodulators,
319, for feedback used in frequency demodulation noise reduction, and subclass 367 for regenerative feedback in an amplitude demodulator.
