US PATENT SUBCLASS 455 / 42
.~ Frequency or phase modulation

Current as of: June, 1999
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455 /   HD   TELECOMMUNICATIONS

39  DF  TRANSMITTER AND RECEIVER AT SEPARATE STATIONS {14}
42.~ Frequency or phase modulation {3}
43  DF  .~.~> With modification of frequencies of analog signal passed (e.g., pre-emphasis and de-emphasis)
44  DF  .~.~> With stated modulation index
45  DF  .~.~> Via subcarrier

DEFINITION

Classification: 455/42

Frequency or phase modulation:

(under subclass 39) Subject matter in which the intelligence or information to be transmitted is applied to a sine wave carrier in such a manner that the instantaneous frequency and/or phase angle of the sine wave carrier is caused to depart from a reference value by an amount proportional to the instantaneous amplitude of the modulating (intelligence)

signal.

SEE OR SEARCH THIS CLASS, SUBCLASS:

23, for frequency or phase modulated repeater.

29, for secret systems with carrier wobbling.

SEE OR SEARCH CLASS

340, Communications: Electrical,

207+, for telemetering systems utilizing frequency or phase modulation. 343, Communications: Radio Wave Antennas,

14, for reflected wave systems utilizing pulse waves frequency or phase modulated; subclass 17.5 for reflected wave systems in general utilizing frequency or phase modulation; and subclasses 100+ for directive systems restricted to radio wave energy and utilizing frequency modulation.

359, Optics: Systems (Including Communication) and Elements,

109+, for optical communication.

375, Pulse or Digital Communications,

200+, for spread spectrum; and subclasses 223, 271, 302+, 329+, and 334+ for pulse communication by frequency or phase modulation of a carrier wave.

380, Cryptography, particularly

322, for carrier wobbling by cryptos:graphic equipment.