US PATENT SUBCLASS 455 / 130
RECEIVER OR ANALOG MODULATED SIGNAL FREQUENCY CONVERTER

Current as of: June, 1999
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455 /   HD   TELECOMMUNICATIONS

130RECEIVER OR ANALOG MODULATED SIGNAL FREQUENCY CONVERTER {24}
131  DF  .~> Frequency conversion between signal source (e.g., wave collector) and receiver
132  DF  .~> Plural receivers {4}
142  DF  .~> Convertible to different type (e.g., AM to FM) {2}
145  DF  .~> Panoramic display {3}
149  DF  .~> Plural output (e.g., plural speakers) (not stereo)
150.1  DF  .~> Signal selection based on frequency (e.g., tuning) {13}
201  DF  .~> Exalted carrier
202  DF  .~> Suppressed carrier
203  DF  .~> Carrier and single sideband
204  DF  .~> Vestigial sideband
205  DF  .~> Frequency or phase modulation {7}
217  DF  .~> With protection circuit for receiver circuit
218  DF  .~> Squelch {5}
226.1  DF  .~> Measuring or testing of receiver {3}
227  DF  .~> Responsive to an input signal of particular predetermined frequency {2}
230  DF  .~> Local control of receiver operation {7}
269  DF  .~> With wave collector (e.g., antenna) {4}
295  DF  .~> Modulation distortion or cross talk correction or elimination
296  DF  .~> Noise or interference elimination {10}
313  DF  .~> Frequency modifying or conversion {4}
334  DF  .~> With particular receiver circuit {6}
344  DF  .~> Combined with diverse art device {1}
347  DF  .~> Cabinet, housing, or chassis structure {4}
352  DF  .~> Remote control of receiver {2}

DEFINITION

Classification: 455/130

RECEIVER OR ANALOG MODULATED SIGNAL FREQUENCY CONVERTER:

(under the class definition) Apparatus comprising (a) means for receiving a carrier wave, upon which an information signal has been modulated, and deriving the original information signal from the modulated carrier wave. Further means may be provided for converting the derived signal into a physical manifestation readily perceived by at least one of the human senses (e.g., sound) or (b) devices whereby an

incoming carrier wave signal, which has been modulated by an analog signal, is changed from one carrier frequency to another carrier frequency.

(1) Note. The system and apparatus found in this and the indented subclasses under (1) above will include wave collection means, at least one wave mixing or modifying means, detector, or demodulator means and utilization means, which utilization means may consist of a sound reproducing device. This class also contains subcombinations of any of the above recited elements combined with coupling circuitry, whereby some function of a complete receiver system is performed; as for example, antenna means broadly plus detector, radio frequency amplifier plus mixer means, etc., and which subcombinations are not elsewhere classifiable.

(2) Note. The apparatus found in this and the indented subclasses will be restricted to those systems which are limited, by claimed subject matter, to use in the reception and utilization of electromagnetic wave energy transmitted in the form of a carrier wave having an analog signal of arbitrary message content modulated thereon or in the form of one or more sidebands, with or without a carrier, resulting from the modulation of a carrier wave by some external source. The modulation may consist of amplitude modulation, frequency, or phase modulation, or any combination thereof. The utilization means will in general comprise loud speaker means but may include visual reproduction means or in some cases a combination of both.

(3) Note. Ordinarily this and the indented subclasses will not include patents whose claimed subject matter includes (a) devices for the operation and control of mechanical devices at a distance by radiant energy, (b) systems and devices for the reception and utilization of facsimile (television) or telegraph signals, (c) systems and devices for the reception of energy which utilize compressional waves in the audible range (telephony), (d) systems and apparatus restricted to the use of radio wave energy which is transmitted to and reflected from some object, the reflected energy being received at a receiving station (i.e., radar), and (e) systems and apparatus for the communication of pulse or digital information.

SEE OR SEARCH CLASS

74, Machine Element or Mechanism,

10+, for mechanical dial operators; and see the notes thereto for the electrical type. 178, Telegraphy; and 379, Telephonic Communications, appropriate subclasses for line instruments restricted to use in these arts, particularly Class 178,

15, 17, 48, and 88+ for receivers and recorders adapted to code-signalling.

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

113+, for miscellaneous frequency conversion or control.

329, Demodulators, appropriate subclasses for demodulators in general and particularly

315+, for frequency demodulators, subclasses 345+ for phase demodulators, and subclasses 347+ for amplitude demodulators.

330, Amplifiers, appropriate subclasses for radio frequency, intermediate frequency, or audio frequency amplifiers, per se, useful in receivers in this class.

331, Oscillators, appropriate subclasses for electrical oscillator systems of general application, particularly

1+, for automatic frequency stabilized oscillators; and subclasses 37+ for beat frequency oscillators similar to the frequency conversion stage of a heterodyne type receiver.

334, Tuners, appropriate subclasses for specific adjustable resonant circuits, per se, utilizable as tuners for radio receivers.

343, Communications: Radio Wave Antennas, 5+, for reflected or otherwise returned wave systems, e.g., radar; and subclasses 100+ for directive radio wave energy systems including receivers; see subclass 113 for direction finding receivers; and subclasses 700+ for antennas which may be used with radio receivers.

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

109+, for optical communication.

370, Multiplex Communications, for modulated carrier wave receivers and systems designed to simultaneously receive a plurality of messages.

375, Pulse or Digital Communications,

316+, for pulse and digital modulated carrier wave receivers.

714, Error Detection/Correction and Fault Detection/Recovery,

712+, for diagnostic test of transmission facility.