US PATENT CLASS 375
Class Notes


Current as of: June, 1999
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375 /   HD   PULSE OR DIGITAL COMMUNICATIONS



DEFINITION

Classification: 375/

GENERAL STATEMENT OF THE CLASS SUBJECT MATTER

This is the generic class for pulse or digital communication systems using electrical or electromagnetic signals. Such communication includes transmitting an intelligence bearing signal from one point to another in the form of discrete variations in some parameter of the electrical or electromagnetic signal.

LINES WITH OTHER CLASSES

Telegraph and Teletype systems which include transmission or reception of a carrier are classified in Class 375 except for those systems specifically provided elsewhere, such as a spark gap and a coherer. See References to Other Classes, below.

A carrier which is modulated by a continuously variable (analog) signal is classified elsewhere (See References to Other Classes, below). A device which is convertible from analog to pulse or digital may have a time related parameter (e.g., pulse width, or repetition rate) continuously variable and be classified herein.

Light Wave Communication is classified elsewhere (See References to Other Classes, below), regardless of the type of modulation.

Duplexing or Multiplexing systems which utilize pulse or digital information signals are classified elsewhere (See References to Other Classes, below).

Code converters which may be utilized in a pulse or digital communication system, are classified elsewhere (See References to Other Classes, below).

Addressing of a particular pulse receiver is classified elsewhere (See References to Other Classes, below). The combination of the subject matter of this class (375) and another art environment is generally classified with the other art environment where that environment is significant by virtue of the claimed relationship. For example: Error checking systems; Electroacoustic geophysical systems; Dynamic Magnetic Information Storage or Retrieval; Radar systems; Directive systems; Telemetering systems; Television. See References to Other Classes, below.

Significantly claimed pulse or digital communication handling techniques in combination with the subject matter of Class 364, Electrical Computers and Data Processing Systems, or Class 395, Information Processing System Organization, are classified in Class 364 or Class 395.

Remote control of a transmitter and/or receiver is classified herein; however, the remote control of a device external to a communication system is classified elsewhere. Remote control of an external device by light wave communications is classified elsewhere. See References to Other Classes, below.

Electrical circuits or devices which may use pulse or digital handling techniques, but are not unique to communications, are classified in the appropriate classes. For example: Pulse characteristic discriminating, comparing or selecting. Pulse responsive selective systems; Pulse demodulation, per se; Pulse modulation converters to FM; Pulse modulation, per se; Pulse generating oscillator; pulse counting circuits and systems; Pulse counters and dividers; Pulse shaping or converting; Digital comparator systems; Data conversion. See References to Other Classes, below.

REFERENCES TO OTHER CLASSES

SEE OR SEARCH CLASS

178, Telegraphy, appropriate subclasses for noncarrier wave teles:graphic signalling.

116, for a spark gap; subclass 117 for a coherer.

181, Acoustics, is the generic class for inventions directed to mechanical sound wave radiations, transmission, or reception.

235, Registers, for data conversion.

250, Radiant Energy, 200+, provide for photoelectric cell circuits.

318, Electricity: Motive Power Systems,

560+, for pulse controlled servo systems.

324, Electricity: Measuring and Testing,

76.12+, for analysis of complex waves; subclasses 76.39+ for measuring the repetition rate of pulses; and subclasses 76.77+ for the phase comparison of pulse voltages.

327, Miscellaneous Active Electrical Nonlinear Devices, Circuits, and Systems,

1+, for pulse characteristic discriminating or selecting and subclasses 100+ for miscellaneous pulse characteristic control.

329, Demodulators,

311+, for pulse demodulators, per se.

331, Oscillators, appropriate subclasses for pulsed or pulse generating oscillators.

332, Modulators, 106+, for pulse modulators, per se; subclass 183, for pulse modulation, per se and for pulse modulation converters to FM.

340, Communications: Electrical,

146.2, for Digital comparator systems, subclasses 350+ for Directive systems; subclassses 825+ for the remote control of a device external to a communication system (e.g., model airplane); subclass 825.52 for addressing of a particular pulse receiver; subclasses 825.57+ for pulse responsive selective signalling systems; subclasses 870.01+ for telemetering systems; subclasses 870.18+ for pulse modulated telemetering systems.

341, Coded Data Generation or Conversion, for code transmission, generation or conversion, including code converters which may be utilized in a pulse or digital communication system.

342, Communicatiions: Directive Radio Wave Systems and Devices,

5+, for radar systems.

348, Television,

471+, ; subclasses 488+ for color television systems utilizing pulse modulation and having receivers to detect same; subclasses 384+ for bandwidth reduction systems wherein the received signal may be impulse form; subclasses 725+ for noncolor television receivers.

358, Facsimile,

426+, and 443+ in facsimile systems for circuitry peculiar to the receiver.

359, Optics; Systems, including Communication and Elements,

109+, for light wave communication; subclasses 142+ for remote control of an external device by light wave communications.

360, Dynamic Magnetic Information Storage or Retrieval,

39+, for general processing of digital signals in a magnetic recording system.

361, Electricity: Electrical Systems and Devices,

166+, for plural pulse responsive relays sequentially operated.

365, Static Information Storage and Retrieval,

189.01+, and 230.01+ for a read/write or addressing circuit which uses pulse signals in a static storage system.

367, Communications, Electrical: Acoustic Wave Systems and Devices, appropriate subclass for the communication of information in the form of traveling stresses in an elastic medium;

14+, for electroacoustic geophysical systems.

370, Multiplex Communications,

320, 335, 342, 441, and 479 for code division multiplexing with spread spectrum techniques.

377, Electrical Pulse Counters, Pulse Dividers, or Shift Registers: Circuits and Systems, for pulse counters and dividers. 395, Information Processing System Organization,821+, for Input/Output data processing involving peripherals and digital data processing systems.

455, Telecommunication, for a carrier which is modulated by a continuously variable (analog) signal. however, simultaneous transmission of independent analog and pulse or digital information bearing signals is classified elsewhere.

709, Electrical Computers and Digital Data Processing Systems: Multiple Computer or Process Coordinating,

200+, for data transferring among multiple computer systems.

714, Error Detection/Correction and Fault Detection/Recovery, appropriate subclasses for generic error checking of digital devices.

GLOSSARY:

COMMUNICATIONS

The transmission of information from one point to another.

DIGITAL

Of or pertaining to the class of devices or circuits in which the output varies in discrete steps (i.e., pulses or "on-off" operation).

PULSE A variation of a voltage or current normally having a constant value. This variation is characterized by a rise and a decay approaching infinitesimal duration.