US PATENT SUBCLASS 379 / 338
REPEATER (E.G., VOICE FREQUENCY)

Current as of: June, 1999
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379 /   HD   TELEPHONIC COMMUNICATIONS

338REPEATER (E.G., VOICE FREQUENCY) {9}
339  DF  .~> With signal conversion (e.g., dial to DTMF, analog to PCM)
340  DF  .~> Having line length compensation or equalization
341  DF  .~> Pulse or tone repeater (e.g., electromechanical relay) {1}
343  DF  .~> Controlled by a pilot or reference signal
344  DF  .~> Component processes bidirectional signals {1}
346  DF  .~> With frequency discriminator or negative impedance element
347  DF  .~> With gain or attenuation control
348  DF  .~> Transmission of power to distant repeater
349  DF  .~> Having voice frequency transformer

DEFINITION

Classification: 379/338

REPEATER (E.G., VOICE FREQUENCY):

(under the class definition) Subject matter which receives and retransmits a signal which is amplified or processed in a telephone system.

(1) Note. This subclass excludes amplifiers in terminal sets, particularly of the hands-free type.

SEE OR SEARCH THIS CLASS, SUBCLASS:

4, for testing of a repeater.

146+, for a coin signal repeater.

238, for a interexchange signalling repeater.

296, for an automatic centralized switching system with a repeater.

420, for a hands-free terminal. 432, for terminal having an amplifier.

SEE OR SEARCH CLASS

330, Amplifiers, appropriate subclasses for an amplifier.

381, Electrical Audio Signal Processing Systems and Devices, appropriate subclasses for an amplifier in an electrical audio system.