US PATENT SUBCLASS 455 / 234.1
.~.~.~ Automatic


Current as of: June, 1999
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455 /   HD   TELECOMMUNICATIONS

130  DF  RECEIVER OR ANALOG MODULATED SIGNAL FREQUENCY CONVERTER {24}
230  DF  .~ Local control of receiver operation {7}
232.1  DF  .~.~ Gain control {2}
234.1.~.~.~ Automatic {15}
234.2  DF  .~.~.~.~> Processor controlled
235.1  DF  .~.~.~.~> Forward acting
236.1  DF  .~.~.~.~> Variable conversion efficiency (variable oscillator amplitude, etc.)
237.1  DF  .~.~.~.~> Responsive to locally injected pilot
238.1  DF  .~.~.~.~> Responsive to vehicle speed
239.1  DF  .~.~.~.~> Nonlinear automatic gain control {4}
245.1  DF  .~.~.~.~> Automatic gain control signal derived from information signal {1}
246.1  DF  .~.~.~.~> Responsive to plural inputs {1}
248.1  DF  .~.~.~.~> Constant or controlled input impedance
249.1  DF  .~.~.~.~> Variable attenuator type
250.1  DF  .~.~.~.~> Automatic gain control to improve strong signal handling
251.1  DF  .~.~.~.~> Plural stages with different levels or bias to each stage (e.g., partial automatic gain control)
252.1  DF  .~.~.~.~> Semiconductor
253.1  DF  .~.~.~.~> Plural stages controlled with plates, screen grids, or cathodes connected in parallel
253.2  DF  .~.~.~.~> Plural amplifier stages


DEFINITION

Classification: 455/234.1

Automatic:

(under subclass 232.1) Subject matter comprising means for automatically controlling the gain as a function of some characteristic of the received carrier wave (e.g., signal

amplitude) or some other conditions.

(1) Note. For information as to the field of search for similar subject matter outside this class, see "SEARCH CLASS", under subclass 232.

SEE OR SEARCH THIS CLASS, SUBCLASS:

205, for frequency or phase-type receivers with automatic gain or volume control.

SEE OR SEARCH CLASS

375, Pulse or Digital Communications,

345, for pulse-type receivers with automatic gain or volume control.