US PATENT SUBCLASS 327 / 306
.~ Amplitude control

Current as of: June, 1999
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327 /   HD   MISCELLANEOUS ACTIVE ELECTRICAL NONLINEAR DEVICES, CIRCUITS, AND SYSTEMS

100  DF  SIGNAL CONVERTING, SHAPING, OR GENERATING {29}
306.~ Amplitude control {5}
307  DF  .~.~> Baseline or DC offset correction
308  DF  .~.~> Variable attenuator
309  DF  .~.~> By limiting, clipping, or clamping {10}
331  DF  .~.~> Maintaining constant level output {1}
333  DF  .~.~> Interstage coupling (e.g., level shift, etc.)

DEFINITION

Classification: 327/306

Amplitude control:

(under subclass 100) Subject matter wherein the amplitude of an input signal waveform is modified, maintained, or regulated to produce the desired output signal.

SEE OR SEARCH THIS CLASS, SUBCLASS:

50+, for voltage signal amplitude comparison (e.g., amplitude responsive pulse selecting systems).

90, for systems wherein the output is a function of the amplitude difference of two points on a wave.

178, for amplitude control systems of a pulse or rectangular wave output.

335, for differentiating networks.

336+, for integrating networks.

356+, for the recited algebraic product of two input signals which may be analogous to gain control circuits. 551+, for unwanted signal suppression and particularly subclasses 552+ for such signal suppression provided by an active filter.

SEE OR SEARCH CLASS

323, Electricity: Power Supply or Regulation Systems,

234+, for a power supply which is output level responsive.

330, Amplifiers,

96, 123, 127+, and 278+ for automatic signal level control or for amplitude limiting of amplifier power supplies.

331, Oscillators,

182+, for amplitude control of oscillator output.

332, Modulators,

149+, for amplitude modulation systems.

333, Wave Transmission Lines and Networks, 14, for amplitude compression and expansion systems (i.e., companders) and subclasses 15, 16, 17.1+, and 81+ for passive element attenuator systems for controlling signal amplitude.

348, Television,

571+, for amplitude control used in television receivers.

455, Telecommunications,

234+, for automatic volume control systems used in radio receivers.