Class   455	TELECOMMUNICATIONS
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1

INTERFERENCE SIGNAL TRANSMISSION (E.G., JAMMING)

2.01

AUDIENCE SURVEY OR PROGRAM DISTRIBUTION USE ACCOUNTING

3.01

WIRELESS DISTRIBUTION SYSTEM

3.02

. (1 indent ) Receiver for satellite broadcast

3.03

. (1 indent ) Remote control of distribution

3.04

.. (2 indent ) With subscriber selection or switching

3.05

. (1 indent ) Two-way

3.06

. (1 indent ) Combined with diverse art device (e.g., audio/sound or entertainment system)

400

HAVING SINGLE-CHANNEL TELEPHONE CARRIER

401

. (1 indent ) Including call signaling (e.g., ringing, off-hook, dialing)

402

. (1 indent ) Over power line

403

RADIOTELEPHONE SYSTEM

404.1

. (1 indent ) Emergency or alarm communication

404.2

.. (2 indent ) Location monitoring

405

. (1 indent ) Usage measurement

406

.. (2 indent ) Billing

407

... (3 indent ) At subscriber unit

408

... (3 indent ) At remote station

409

.. (2 indent ) Rental

410

. (1 indent ) Security or fraud prevention

411

.. (2 indent ) Privacy, lock-out, or authentication

412.1

. (1 indent ) Message storage or retrieval

412.2

.. (2 indent ) Having message notification

413

.. (2 indent ) Voice mail

414.1

. (1 indent ) Special service

414.2

.. (2 indent ) User location independent information retrieval

414.3

... (3 indent ) Based on request (e.g., news, weather, etc.)

414.4

... (3 indent ) Format conversion (e.g., text, audio, etc.)

415

.. (2 indent ) Caller identification

416

.. (2 indent ) Call conferencing

417

.. (2 indent ) Call diversion

418

. (1 indent ) Programming control

419

.. (2 indent ) Remote programming control

420

... (3 indent ) Control of another apparatus

421

. (1 indent ) Out-of-range indication

422.1

. (1 indent ) Zoned or cellular telephone system

423

.. (2 indent ) Diagnostic testing, malfunction indication, or electrical condition measurement

424

... (3 indent ) System equipment

425

... (3 indent ) Subscriber equipment

426.1

.. (2 indent ) Including other radio communication system (e.g., cordless telephone, paging, trunking, etc.)

426.2

.. (2 indent ) Wireless service for fixed premises equipment (e.g., Wireless Local Loop (WLL) Telco emulator, etc.)

427

.. (2 indent ) Space satellite

428

... (3 indent ) Switching or routing

429

... (3 indent ) Cell projection

430

... (3 indent ) Ground station control

431

.. (2 indent ) Airborne or aircraft

432.1

.. (2 indent ) Roaming

432.2

... (3 indent ) System format conversion

432.3

... (3 indent ) Service profile

433

... (3 indent ) Home location registration (HLR) or visitor location registration (VLR) detail

434

.. (2 indent ) Control or access channel scanning

435.1

.. (2 indent ) Registration

435.2

... (3 indent ) System selection

435.3

.... (4 indent ) Based on priority

436

.. (2 indent ) Handoff

437

... (3 indent ) Mobile assisted or initiated

438

... (3 indent ) Serving site initiated

439

... (3 indent ) Handoff initiated by another source (e.g., target, user initiated, mobile switching center (MSC), or mobile telephone switching office (MTSO), etc.)

440

... (3 indent ) Based upon unit location

441

... (3 indent ) Based upon unit velocity

442

... (3 indent ) Soft handoff

443

... (3 indent ) Overlapping cells

444

... (3 indent ) Between macro and micro cells

445

.. (2 indent ) Call routing (e.g., to prevent backhaul, routing efficiency, least cost, or alternate routing)

446

.. (2 indent ) Including cell planning or layout

447

... (3 indent ) Frequency reuse scheme

448

... (3 indent ) Co-located systems

449

... (3 indent ) Hierarchical cell structure

450

.. (2 indent ) Channel allocation

451

... (3 indent ) Hybrid allocation

452.1

... (3 indent ) Dynamic allocation

452.2

.... (4 indent ) Based on service quality (e.g., bandwidth, etc.)

453

... (3 indent ) Load balancing

454

... (3 indent ) Spectrum sharing for different type of system (e.g., point-to-point microwave, television, etc.)

455

.. (2 indent ) Channel seizing

456.1

.. (2 indent ) Location monitoring

456.2

... (3 indent ) Based on request signal

456.3

... (3 indent ) Position based personal service

456.4

... (3 indent ) Quiet or transmission prevention mode

456.5

... (3 indent ) At system equipment (i.e., base station)

456.6

... (3 indent ) At remote station (i.e., mobile station)

457

... (3 indent ) Location display

458

.. (2 indent ) Specific paging technique

459

... (3 indent ) Meet-me system

460

... (3 indent ) Auto-dialing

461

. (1 indent ) Including personal numbering system (i.e., intelligent network for subscriber tracking or follow-me subscriber feature)

462

. (1 indent ) Including private cordless extension system

463

.. (2 indent ) Multi-users

464

.. (2 indent ) Channel selection or allocation

465

. (1 indent ) Including public cordless extension system

466

. (1 indent ) Auxiliary data signaling (e.g., short message service (SMS))

7

CARRIER WAVE REPEATER OR RELAY SYSTEM (I.E., RETRANSMISSION OF SAME INFORMATION)

8

. (1 indent ) Failure compensation (e.g., spare channel)

9

. (1 indent ) Monitoring

10

.. (2 indent ) Fading compensation

11.1

. (1 indent ) Portable or mobile repeater

12.1

.. (2 indent ) Space satellite

13.1

... (3 indent ) With plural repeater or relay systems

13.2

... (3 indent ) With synchronizing of satellites or system

13.3

... (3 indent ) With antenna feed network or multiple antenna switching

13.4

... (3 indent ) Power control

14

. (1 indent ) With transmission line

15

. (1 indent ) Two separate way transmission

16

.. (2 indent ) Simultaneous using plural repeaters at each location

17

. (1 indent ) Plural modulated carriers

18

. (1 indent ) With delay or recording

19

. (1 indent ) Common antenna

20

. (1 indent ) With frequency conversion

21

.. (2 indent ) With demodulator

22

.. (2 indent ) Plural conversion stages

23

. (1 indent ) Frequency or phase modulation

24

. (1 indent ) Transmitter/receiver feedback compensation

25

. (1 indent ) Directive antenna

26.1

USE OR ACCESS BLOCKING (E.G., LOCKING SWITCH)

39

TRANSMITTER AND RECEIVER AT SEPARATE STATIONS

40

. (1 indent ) Earth or water medium

41.1

. (1 indent ) Near field (i.e., inductive or capacitive coupling)

41.2

. (1 indent ) Short range RF communication

41.3

.. (2 indent ) To output device

42

. (1 indent ) Frequency or phase modulation

43

.. (2 indent ) With modification of frequencies of analog signal passed (e.g., pre-emphasis and de-emphasis)

44

.. (2 indent ) With stated modulation index

45

.. (2 indent ) Via subcarrier

46

. (1 indent ) Suppressed carrier wave system

47

. (1 indent ) Single or vestigial sideband system

48

. (1 indent ) Inverted sideband

500

. (1 indent ) Plural transmitters or receivers (i.e., more than two stations)

501

.. (2 indent ) Noise, distortion, or singing reduction

502

... (3 indent ) Synchronized stations

503

.... (4 indent ) Simulcast system

504

... (3 indent ) Fading compensation

505

.... (4 indent ) Due to weather

506

.... (4 indent ) Rayleigh or multipath fading

507

.. (2 indent ) Central station (e.g., master, etc.)

508

... (3 indent ) Having console

509

... (3 indent ) Channel allocation

510

.... (4 indent ) Plural requests (e.g., retries)

511

.... (4 indent ) Control channel/voice channel conversion

512

.... (4 indent ) Based on priority

513

.... (4 indent ) Ranking (e.g., based on signal strength, etc.)

514

.... (4 indent ) Having storage detail

515

... (3 indent ) Control channel monitoring (i.e., paging or access channel signaling) for system access

516

... (3 indent ) Channel seizing

517

... (3 indent ) To or from mobile station

518

.... (4 indent ) Having talk group

519

....• (5 indent ) Talk group forming (e.g., dynamic regrouping, talk group assignment)

520

....• (5 indent ) On-site or multi-site trunking

521

.... (4 indent ) Emergency dispatch or response

522

.... (4 indent ) Transmission power control technique

523

.... (4 indent ) Using radiating transmission line

524

.... (4 indent ) Multiple base stations

525

....• (5 indent ) Base station selection

526

... (3 indent ) Plural receivers tuned to common frequency

527

.. (2 indent ) Break-in or priority override

528

.. (2 indent ) Lockout or busy-idle signaling

59

. (1 indent ) Single message via plural carrier wave transmission

60

.. (2 indent ) Different phases of same frequency carrier

61

. (1 indent ) Single message via plural modulation of single carrier

62

. (1 indent ) Optimum frequency selection

63.1

. (1 indent ) Distortion, noise, or other interference prevention, reduction, or compensation

63.2

.. (2 indent ) System with hierarchical coverage areas

63.3

.. (2 indent ) Frequency switching

63.4

.. (2 indent ) Directional antenna

64

.. (2 indent ) Plasma source or barrier

65

.. (2 indent ) Anti-multipath

66.1

. (1 indent ) Having diverse art device

67.11

. (1 indent ) Having measuring, testing, or monitoring of system or part

67.12

.. (2 indent ) Using a chamber (e.g., room testing or audio surveillance, etc.)

67.13

.. (2 indent ) Noise, distortion, or unwanted signal detection (e.g., quality control, etc.)

67.14

.. (2 indent ) Using a test signal

67.15

.. (2 indent ) Of a microwave link or system

67.16

.. (2 indent ) Phase measuring (e.g., group delay, propagation effect, etc.)

67.7

.. (2 indent ) With indication (e.g., visual or voice signalling, etc.)

68

. (1 indent ) With control signal

69

.. (2 indent ) Transmitter controlled by signal feedback from receiver

701

.. (2 indent ) Tone coded squelch

702

... (3 indent ) Plural tones

703

.... (4 indent ) Difference frequency

70

.. (2 indent ) Receiver control signal originates at message transmitter

71

... (3 indent ) Frequency control

72

... (3 indent ) For compression and expansion of message signal (i.e., companding)

73

TRANSMITTER AND RECEIVER AT SAME STATION (E.G., TRANSCEIVER)

74

. (1 indent ) Convertible (e.g., to diverse art device)

74.1

.. (2 indent ) Cordless/corded conversion

75

. (1 indent ) With frequency stabilization (e.g., automatic frequency control)

76

.. (2 indent ) Synthesizer

77

. (1 indent ) With tuning

78

. (1 indent ) With transmitter-receiver switching or interaction prevention

79

.. (2 indent ) Automatic (e.g., voice operated)

80

... (3 indent ) With distributed parameter coupling

81

.... (4 indent ) Waveguide

82

... (3 indent ) Common antenna

83

.. (2 indent ) Single antenna switched between transmitter and receiver

84

. (1 indent ) With a common signal processing stage

85

.. (2 indent ) Transmitter oscillator used as detector

86

.. (2 indent ) Transmitter oscillator used as local oscillator

87

... (3 indent ) Tunable or variable

88

. (1 indent ) Transceiver controlling a separate transceiver or receiver

550.1

. (1 indent ) Radiotelephone equipment detail

551

.. (2 indent ) Number assignment module (NAM) detail

552.1

.. (2 indent ) Operable on more than one system

553.1

... (3 indent ) Radiotelephone having plural transceivers (e.g., for analog and digital, trunking and cellular, etc.)

554.1

.. (2 indent ) Remote private branch exchange (PBX) with wireless link to landline

554.2

.. (2 indent ) Equipment detail for providing wireless link to fixed equipment (e.g., WLL, Telco emulator, etc.)

555

.. (2 indent ) Wireless private branch exchange (PBX) (i.e., wireless link to extension unit)

556.1

.. (2 indent ) Integrated with other device

556.2

... (3 indent ) Personal digitial assistant

557

.. (2 indent ) Interface attached device (e.g., interface with modem, facsimile, computer, etc.)

558

... (3 indent ) Card control element

559

... (3 indent ) Smart cable

560

.. (2 indent ) Switching unit detail (e.g., mobile telephone switching office (MTSO), base station controller (BSC), etc.)

561

.. (2 indent ) Base station detail

562.1

... (3 indent ) Having specific antenna arrangement

563

.. (2 indent ) Having voice recognition or synthesization

564

.. (2 indent ) Auto-dialing or repertory dialing (e.g., using bar code, etc.)

565

.. (2 indent ) Restrictive dialing circuitry

566

.. (2 indent ) Having display

567

.. (2 indent ) Call alerting

569.1

.. (2 indent ) Hands-free or loudspeaking arrangement

569.2

... (3 indent ) In vehicle

570

... (3 indent ) Noise suppression or echo cancellation

571

.. (2 indent ) Power booster

572

.. (2 indent ) Power supply

573

... (3 indent ) Battery charging

574

... (3 indent ) Power conservation

575.1

.. (2 indent ) Housing or support

575.2

... (3 indent ) Headgear

575.3

... (3 indent ) Foldable type

575.4

... (3 indent ) Slidable type

575.5

... (3 indent ) Antenna shielding

575.6

... (3 indent ) Attached or connected to user

575.7

... (3 indent ) Having specific antenna arrangement

575.8

... (3 indent ) Protective cover

575.9

... (3 indent ) In vehicle

90.1

. (1 indent ) Having particular application (e.g., avalanche victim assistance) of a transceiver

90.2

. (1 indent ) Having particular configuration (e.g., C.B., or walkie-talkie) of a transceiver

90.3

. (1 indent ) Having particular housing or support of a transceiver

91

TRANSMITTER

92

. (1 indent ) Remote control of a transmitter

93

. (1 indent ) Convertible to different type (e.g., AM to FM)

94

. (1 indent ) Alternator

95

. (1 indent ) Mobile or portable

96

.. (2 indent ) Transmitter ejected from moving vehicle

97

.. (2 indent ) With antenna ejection or external support

98

.. (2 indent ) With aircraft, satellite, or projectile

99

.. (2 indent ) With vehicle

100

.. (2 indent ) Body attached or connected

101

. (1 indent ) Diversity

102

. (1 indent ) Plural modulation

103

. (1 indent ) Plural separate transmitters or channels

104

.. (2 indent ) Carrier and sidebands separately transmitted

105

.. (2 indent ) Common frequency

106

. (1 indent ) Modulation by absorption, shielding, or reflecting

107

. (1 indent ) With variation of antenna impedance or dimension for modulation

108

. (1 indent ) Amplitude modulation

109

.. (2 indent ) Vestigial or single sideband or suppressed carrier

110

. (1 indent ) Angle modulation

111

.. (2 indent ) Including distributed parameter structure

112

.. (2 indent ) With frequency multiplication or division

113

.. (2 indent ) With frequency control

114.1

. (1 indent ) Having harmonic radiation suppression

114.2

. (1 indent ) Noise or interference elimination

114.3

.. (2 indent ) Predistortion (e.g., for power amplifier)

115.1

. (1 indent ) Measuring, testing, or monitoring of transmitter

115.2

.. (2 indent ) Using a test signal

115.3

.. (2 indent ) Signal strength

115.4

.. (2 indent ) Having meter or indicator

116

. (1 indent ) Carrier amplitude control (e.g., voice operated on/off)

117

. (1 indent ) With electrical protection of transmitter circuit or operator

118

. (1 indent ) Frequency conversion

119

. (1 indent ) Carrier frequency stabilization

120

. (1 indent ) Including tuning

121

.. (2 indent ) In antenna circuit

122

... (3 indent ) With saturable reactor

123

... (3 indent ) Automatically controlled

124

.. (2 indent ) Distributed parameter device

125

.. (2 indent ) Automatic adjustment of tuning

126

. (1 indent ) With feedback of modulated output signal

127.1

. (1 indent ) Power control, power supply, or bias voltage supply

127.2

.. (2 indent ) Gain control

127.3

... (3 indent ) Plural amplifier stages

127.4

.. (2 indent ) Dual mode (e.g., analog and digital)

127.5

.. (2 indent ) Power conservation

128

. (1 indent ) With casing or housing

129

. (1 indent ) With coupled antenna

130

RECEIVER OR ANALOG MODULATED SIGNAL FREQUENCY CONVERTER

131

. (1 indent ) Frequency conversion between signal source (e.g., wave collector) and receiver

132

. (1 indent ) Plural receivers

133

.. (2 indent ) With output selecting

134

... (3 indent ) By signal strength

135

... (3 indent ) By signal quality (e.g., signal to noise ratio)

136

... (3 indent ) With control (e.g., automatic gain control, automatic frequency control, etc.)

137

.. (2 indent ) With output combining

138

... (3 indent ) With control (e.g., automatic gain control)

139

.... (4 indent ) Frequency or phase control

140

.. (2 indent ) Selectively actuated or controlled

141

.. (2 indent ) Including common stage (e.g., local oscillator)

142

. (1 indent ) Convertible to different type (e.g., AM to FM)

143

.. (2 indent ) With distinct signal path for each type

144

.. (2 indent ) With dual purpose amplifying or other stage

145

. (1 indent ) Panoramic display

146

.. (2 indent ) Plural separate paths or plural oscillators

147

.. (2 indent ) Particular local oscillator control

148

.. (2 indent ) With oscilloscope sweep signal derivation or control

149

. (1 indent ) Plural output (e.g., plural speakers) (not stereo)

150.1

. (1 indent ) Signal selection based on frequency (e.g., tuning)

151.1

.. (2 indent ) Remote control of channel or station selection

151.2

... (3 indent ) Wireless link (sonic, RF, or infrared)

151.3

... (3 indent ) Remote oscillator tuned

151.4

... (3 indent ) Plural electronic devices controlled

152.1

... (3 indent ) Of or combined with vehicle receiver

153.1

... (3 indent ) Mechanical

153.2

.... (4 indent ) With wired link

154.1

.. (2 indent ) With indication of frequency, channel, or selector condition (e.g., tuning aid)

154.2

... (3 indent ) Scanning display

155.1

... (3 indent ) By meter

156.1

... (3 indent ) Audible indicator

157.1

... (3 indent ) Analog frequency indication (e.g., dial)

157.2

.... (4 indent ) With light indication or bar type

158.1

... (3 indent ) Channel index indication

158.2

.... (4 indent ) With electronic digital indication

158.3

....• (5 indent ) Using a counter

158.4

.... (4 indent ) With multiple display functions

158.5

.... (4 indent ) Non-numeric display (e.g., call letters)

159.1

... (3 indent ) Variable light indication

159.2

.... (4 indent ) Plural lamps

160.1

.. (2 indent ) Plural tuning modes (e.g., manual and scanning, etc.)

161.1

.. (2 indent ) Frequency scanning

161.2

... (3 indent ) With processor control

161.3

... (3 indent ) Using signal strength or quality

162.1

... (3 indent ) Motor activated

163.1

.... (4 indent ) Reversible motor (e.g., end-stop control)

164.1

... (3 indent ) With automatic frequency control

164.2

.... (4 indent ) Processor controlled (AFC)

165.1

... (3 indent ) With frequency synthesizer

166.1

... (3 indent ) With channel skipping selection

166.2

.... (4 indent ) With priority channel selection

167.1

... (3 indent ) With dual sweeping

168.1

... (3 indent ) Multiband

169.1

... (3 indent ) With particular variable voltage or current tuning

169.2

.... (4 indent ) With varactor diode

170.1

.. (2 indent ) With mechanical or electromechanical selection

171.1

... (3 indent ) Time actuated

172.1

.... (4 indent ) Including a motor

173.1

... (3 indent ) With automatic frequency control of fine tuning

174.1

... (3 indent ) With muting (e.g., silent tuning)

175.1

... (3 indent ) With carrier wave preset

176.1

... (3 indent ) Combined with band selection

177.1

... (3 indent ) Combined with other control (e.g., bandwidth, volume, gain, etc.)

178.1

... (3 indent ) With plurality of tunable circuits

179.1

.. (2 indent ) Channel or station selection

180.1

... (3 indent ) Combined with band selection

180.2

.... (4 indent ) UHF and VHF

180.3

....• (5 indent ) With phase locked loop (PLL) tuning

180.4

....• (5 indent ) Varactor tuned (e.g., varactor diode)

181.1

... (3 indent ) Time controlled

182.1

... (3 indent ) With frequency control

182.2

.... (4 indent ) Automatic (AFC)

182.3

... (3 indent ) Fine tuning

183.1

... (3 indent ) With frequency synthesizer

183.2

.... (4 indent ) Processor controlled

184.1

... (3 indent ) With comparing desired and existing tuning conditions

185.1

... (3 indent ) With channel information storage

186.1

.... (4 indent ) With memory control or programming

186.2

....• (5 indent ) Having a keyboard

187.1

... (3 indent ) Separate tuned circuits for each channel or station

188.1

.. (2 indent ) Band selection

188.2

... (3 indent ) UHF and VHF

189.1

... (3 indent ) With plural separate mixer or converter circuits

190.1

... (3 indent ) With frequency conversion

191.1

... (3 indent ) With plurality of tuned circuits

191.2

.... (4 indent ) Varactor tuned

191.3

.... (4 indent ) With switching between stages

192.1

.. (2 indent ) With frequency control

192.2

... (3 indent ) Automatic (AFC)

192.3

... (3 indent ) Fine tuning

193.1

.. (2 indent ) With antenna circuit tuning

193.2

... (3 indent ) With plural resonant circuits

193.3

... (3 indent ) Including varactor diode

194.1

.. (2 indent ) With muting (e.g., silent tuning)

194.2

... (3 indent ) Amplifier controlled

195.1

.. (2 indent ) Variable voltage or current tuning

196.1

.. (2 indent ) Including variation of local oscillator frequency

197.1

... (3 indent ) By simultaneous control with signal selection

197.2

.... (4 indent ) Variable capacitor tuned

197.3

....• (5 indent ) Including additional tuning circuit

198.1

.... (4 indent ) Including distributed parameter control device

199.1

.... (4 indent ) Discrete frequency types (e.g., channel switching)

200.1

.. (2 indent ) With other control (e.g., volume, gain, bandwidth, etc.)

201

. (1 indent ) Exalted carrier

202

. (1 indent ) Suppressed carrier

203

. (1 indent ) Carrier and single sideband

204

. (1 indent ) Vestigial sideband

205

. (1 indent ) Frequency or phase modulation

206

.. (2 indent ) Responsive to one of overlapping signals

207

.. (2 indent ) With plural conversion

208

.. (2 indent ) With synchronized or controlled local oscillator

209

... (3 indent ) Plural local oscillators or mixers

210

.. (2 indent ) With carrier amplitude modulation elimination (e.g., specified limiter)

211

... (3 indent ) Combined with other function

212

.. (2 indent ) With squelch or other audio output silencing

213

... (3 indent ) Using specified filter

214

.. (2 indent ) With particular discriminator or detector

215

... (3 indent ) Superregenerative

216

.. (2 indent ) With particular frequency division or multiplication

217

. (1 indent ) With protection circuit for receiver circuit

218

. (1 indent ) Squelch

219

.. (2 indent ) With automatic gain or volume control

220

.. (2 indent ) Adjustable

221

.. (2 indent ) Audio responsive

222

.. (2 indent ) Noise controlled

223

... (3 indent ) Short duration (noise blankers)

224

.... (4 indent ) Separate broadband detector channel

225

.. (2 indent ) Plural paths

226.1

. (1 indent ) Measuring or testing of receiver

226.2

.. (2 indent ) Signal strength

226.3

.. (2 indent ) Signal-to-noise ratio

226.4

.. (2 indent ) With meter or indicator

227

. (1 indent ) Responsive to an input signal of particular predetermined frequency

228

.. (2 indent ) Responsive to specified modulation (e.g., call alarm, Conelrad)

229

.. (2 indent ) Responsive to carrier absence or presence

230

. (1 indent ) Local control of receiver operation

231

.. (2 indent ) Applied at or for specific intervals or periods of time

232.1

.. (2 indent ) Gain control

233.1

... (3 indent ) With diverse control (tone, etc.)

234.1

... (3 indent ) Automatic

234.2

.... (4 indent ) Processor controlled

235.1

.... (4 indent ) Forward acting

236.1

.... (4 indent ) Variable conversion efficiency (variable oscillator amplitude, etc.)

237.1

.... (4 indent ) Responsive to locally injected pilot

238.1

.... (4 indent ) Responsive to vehicle speed

239.1

.... (4 indent ) Nonlinear automatic gain control

240.1

....• (5 indent ) Variable automatic gain control loop gain

241.1

....• (5 indent ) Different gain stages

242.1

....• (5 indent ) Delayed

242.2

....•. (6 indent ) Different delay for different signal stages or thresholds

243.1

....•. (6 indent ) Radio frequency stage only delayed

244.1

....• (5 indent ) Dual time constant

245.1

.... (4 indent ) Automatic gain control signal derived from information signal

245.2

....• (5 indent ) Plural stages controlled

246.1

.... (4 indent ) Responsive to plural inputs

247.1

....• (5 indent ) Separate automatic gain control signals

248.1

.... (4 indent ) Constant or controlled input impedance

249.1

.... (4 indent ) Variable attenuator type

250.1

.... (4 indent ) Automatic gain control to improve strong signal handling

251.1

.... (4 indent ) Plural stages with different levels or bias to each stage (e.g., partial automatic gain control)

252.1

.... (4 indent ) Semiconductor

253.1

.... (4 indent ) Plural stages controlled with plates, screen grids, or cathodes connected in parallel

253.2

.... (4 indent ) Plural amplifier stages

254

.. (2 indent ) Sensitivity control

255

.. (2 indent ) Local oscillator frequency control

256

... (3 indent ) Combined with other control

257

... (3 indent ) Automatic

258

.... (4 indent ) Utilizing particular local oscillator control

259

....• (5 indent ) Reference oscillator or source

260

....•. (6 indent ) Phase lock loop or frequency synthesizer

261

....• (5 indent ) Variable reactance (e.g., reactance tube)

262

....•. (6 indent ) Voltage controlled capacitor

263

....• (5 indent ) Discriminator or detector

264

....• (5 indent ) Voltage control of oscillator

265

.... (4 indent ) With local oscillator synchronization or locking

266

.. (2 indent ) Selectivity or bandwidth control

267

.. (2 indent ) Tone control

268

.. (2 indent ) Fidelity control

269

. (1 indent ) With wave collector (e.g., antenna)

270

.. (2 indent ) Power-line or receiver element used as wave collector

271

.. (2 indent ) Suppression of radiation from receiver via wave collector

272

.. (2 indent ) Plural separate collectors

273

... (3 indent ) With particular output combining

274

.... (4 indent ) Loop or coil antenna

275

... (3 indent ) With frequency changing or selecting in the output path of one or more collectors

276.1

... (3 indent ) With phase shifting, correcting, or regulating in the output path of one or more collectors

277.1

... (3 indent ) Selectively or alternately connected to receiver

277.2

.... (4 indent ) By signal quality (e.g., noise)

278.1

... (3 indent ) Combined with noise or interference elimination

279.1

.... (4 indent ) Plural antenna currents entering single transformer

280

.. (2 indent ) With coupling to a stage of the receiver

281

... (3 indent ) Having distributed parameters

282

.... (4 indent ) Transmission line

283

... (3 indent ) Undesired signal or noise control (e.g., antistatic)

284

.... (4 indent ) Balancing or cancelling

285

.... (4 indent ) With image frequency suppression

286

.... (4 indent ) Wave filter, coil, or wave trap

287

.... (4 indent ) Shunt or bypass

288

.... (4 indent ) Particular composition (e.g., of cell or element)

289

... (3 indent ) With coupling varying, regulating, or control

290

... (3 indent ) Including passive tuned circuit

291

... (3 indent ) Using active device (e.g., as preamplifier or reactance)

292

... (3 indent ) Transformer or other passive inductance

293

... (3 indent ) Specified stage (e.g., mixer, amplifier, or demodulator)

294

.... (4 indent ) With particular electron tube structure

295

. (1 indent ) Modulation distortion or cross talk correction or elimination

296

. (1 indent ) Noise or interference elimination

297

.. (2 indent ) In vehicle

298

.. (2 indent ) Originating in power supply

299

... (3 indent ) Filter or rectification in power supply energized by fluctuating or a.c. source

300

.. (2 indent ) By shielding

301

... (3 indent ) Plural or compartmented shielding structure

302

.. (2 indent ) Image frequency suppression

303

.. (2 indent ) Using plural separate signal paths

304

... (3 indent ) Phase shift in at least one path

305

... (3 indent ) With balancing or neutralizing

306

.... (4 indent ) Filter in at least one path

307

.. (2 indent ) With specific filter structure

308

.. (2 indent ) With amplitude limiter

309

... (3 indent ) In demodulator or low frequency (audio amplifier circuit)

310

.. (2 indent ) Internally generated noise or oscillations

311

.. (2 indent ) In radio frequency amplifier, intermediate frequency amplifier or converter circuit

312

.. (2 indent ) In demodulator or low frequency (e.g., audio frequency)

313

. (1 indent ) Frequency modifying or conversion

314

.. (2 indent ) Plural separate successive conversions

315

... (3 indent ) With plural separate local oscillators

316

.... (4 indent ) With frequency stabilization for at least one local oscillator

317

.. (2 indent ) Unwanted oscillation or radiation prevention

318

.. (2 indent ) With specified local oscillator structure or coupling

319

... (3 indent ) With particular coupling

320

.... (4 indent ) Lumped impedance

321

... (3 indent ) In a single envelope or with common active element (e.g., autodyne)

322

.... (4 indent ) Plural common electrode

323

.. (2 indent ) Particular frequency conversion structure or circuitry

324

... (3 indent ) Homodyne (i.e., zero beat or synchrodyne reception)

325

... (3 indent ) Including distributed electrical parameter structure

326

.... (4 indent ) With balanced mixer

327

....• (5 indent ) Stripline

328

....• (5 indent ) Hollow waveguide

329

.... (4 indent ) Electron beam tube

330

.... (4 indent ) With nonlinear impedance (e.g., diode)

331

... (3 indent ) Crystal or electron tube diode

332

... (3 indent ) Push-pull

333

... (3 indent ) Transistor or integrated circuit

334

. (1 indent ) With particular receiver circuit

335

.. (2 indent ) Plural diverse function tube or stage (performs plural functions alternately or concurrently)

336

.. (2 indent ) Superregenerative detector or discriminator

337

.. (2 indent ) Discriminator or demodulator

338

.. (2 indent ) Coupling or decoupling between stages

339

... (3 indent ) Band pass filter

340

... (3 indent ) Variably tunable or adjustable

341

.. (2 indent ) Amplifier

342

... (3 indent ) Reflex type

343.1

.. (2 indent ) Having particular power or bias supply (including self-powered or battery saving means)

343.2

... (3 indent ) Battery saving based on received signal

343.3

.... (4 indent ) Based on identification

343.4

.... (4 indent ) Based on schedule information

343.5

... (3 indent ) Battery saving based on detected power source level

343.6

... (3 indent ) Back-up power supply

344

. (1 indent ) Combined with diverse art device

345

.. (2 indent ) With vehicle

346

... (3 indent ) Detachable for portability

347

. (1 indent ) Cabinet, housing, or chassis structure

348

.. (2 indent ) With retractable or readily detachable chassis

349

.. (2 indent ) Sectional or interconnectable (e.g., modules)

350

.. (2 indent ) With particular speaker mounting

351

.. (2 indent ) Transportable

352

. (1 indent ) Remote control of receiver

353

.. (2 indent ) Plural conditions from remote station

354

... (3 indent ) Mechanical

355

.. (2 indent ) Amplitude, volume, or gain control

899

MISCELLANEOUS

	FOREIGN ART COLLECTIONS

FOR000

CLASS-RELATED FOREIGN DOCUMENTS

Any foreign patents or non-patent literature from subclasses that have been reclassified have been transferred directly to FOR Collections listed below. These Collections contain ONLY foreign patents or non-patent literature. The parenthetical references in the Collection titles refer to the abolished subclasses from which these Collections were derived.

FOR106

PLURAL TRANSMITTERS OR RECEIVERS (I.E., MORE THAN TWO STATIONS) (455/49.1)

FOR107

. (1 indent ) Noise, distortion, or singing reduction (455/50.1)

FOR108

.. (2 indent ) Synchronized stations (455/51.1)

FOR109

... (3 indent ) Simulcast system (455/51.2)

FOR110

.. (2 indent ) Fading compensation (455/52.1)

FOR111

... (3 indent ) Due to weather attenuation (455/52.2)

FOR112

... (3 indent ) Rayleigh or multipath fading (455/52.3)

FOR113

. (1 indent ) With central station (e.g., master, etc.) (455/53.1)

FOR114

.. (2 indent ) To or from mobile station (455/54.1)

FOR115

... (3 indent ) With service request and response (455/54.2)

FOR116

... (3 indent ) Using radiating transmission line (455/55.1)

FOR117

... (3 indent ) Multiple base stations (455/56.1)

FOR118

.. (2 indent ) Plural receivers tuned to common frequency (455/57.1)

FOR119

. (1 indent ) Break-in or priority override (455/58.1)

FOR120

. (1 indent ) Lockout or busy-idle signalling (455/58.2)

FOR121

PORTABLE OR MOBILE TRANSCEIVER (455/89)

FOR200

HAVING SINGLE CHANNEL TELEPHONE CARRIER (379/64)

FOR201

. (1 indent ) Including call signalling (e.g., ringing, off-hook, dialing) (379/65)

FOR202

. (1 indent ) Over power line (379/66)

FOR203

EXCLUSIVE ASSIGNED CHANNEL (455/34.1)

FOR204

SEIZED CHANNEL (455/34.2)

FOR205

RADIO TELEPHONE SYSTEM OR EQUIPMENT DETAIL (379/58)

FOR206

. (1 indent ) Zoned or cellular (379/59, 455/33.1)

FOR207

.. (2 indent ) Hand-off control (379/60, 455/33.2)

FOR208

... (3 indent ) Using plural antennas (455/33.3)

FOR209

.. (2 indent ) Having overlapping zones (455/33.4)

FOR210

. (1 indent ) Including cordless extension set (i.e., having single subscriber line access) (379/61)

FOR211

.. (2 indent ) Having privacy or lockout (e.g., identity verification) (379/62)

FOR212

. (1 indent ) Including supervisory or control signalling (379/63)

FOR213

AUDIENCE SURVEY OR PROGRAM DISTRIBUTION USE ACCOUNTING (455/2)

FOR214

DISTRIBUTION SYSTEM (E.G., PLURAL CABLES, ETC.) (455/3.1)

FOR215

. (1 indent ) Receiver for satellite broadcast (455/3.2)

FOR216

. (1 indent ) Combined with power distribution network (455/3.3)

FOR217

. (1 indent ) Remote control of distribution (455/4.1)

FOR218

.. (2 indent ) With subscriber selection or switching (455/4.2)

FOR219

. (1 indent ) Two-way (455/5.1)

FOR220

. (1 indent ) Common antenna or cable (455/6.1)

FOR221

.. (2 indent ) With specific cable converter (455/6.2)

FOR222

. (1 indent ) Combined with diverse art device (e.g., audio/sound or entertainment systems) (455/6.3)

FOR223

. (1 indent ) Near field (e.g., inductive or capacitive coupling) (455/41)

FOR224

. (1 indent ) Distortion, noise, or other interference prevention, reduction, or compensation (455/63)

FOR225

. (1 indent ) With diverse art device (455/66)

FOR226

. (1 indent ) With measuring, testing, or monitoring of system or part (455/67.1)

FOR227

.. (2 indent ) Using a chamber (e.g., room testing or audio surveillance, etc.) (455/67.2)

FOR228

.. (2 indent ) Noise, distortion or unwanted signal detection (e.g., quality control, etc.) (455/67.3)

FOR229

.. (2 indent ) Using a test signal (455/67.4)

FOR230

.. (2 indent ) Of a microwave link or system (455/67.5)

FOR231

.. (2 indent ) Phase measuring (e.g., group delay propagation effects, etc.) (455/67.6)

FOR232

. (1 indent ) Housing or support (455/90)

FOR233

. (1 indent ) With harmonic radiation suppression (455/114)

FOR234

. (1 indent ) Measuring, testing, or monitoring of transmitter (455/115)

FOR235

. (1 indent ) Power or bias voltage supply (455/127)

FOR236

.. (2 indent ) With particular power or bias supply (includes battery saving means and includes self-powered) (455/343)

FOR237

. (1 indent ) Emergency or alarm communication (455/404)

FOR238

. (1 indent ) Message storage or retrieval (455/412)

FOR239

. (1 indent ) Special service (455/414)

FOR240

. (1 indent ) Zoned or cellular telephone system (455/422)

FOR241

.. (2 indent ) Including other radio communication system (e.g., cordless telephone, paging, trunking, etc.) (455/426)

FOR242

.. (2 indent ) Roaming (455/432)

FOR243

.. (2 indent ) Registration (455/435)

FOR244

... (3 indent ) Dynamic allocation (455/452)

FOR245

.. (2 indent ) Location monitoring (455/456)

FOR246

. (1 indent ) Radiotelephone equipment detail (455/550)

FOR247

.. (2 indent ) Operable on more than one system (455/552)

FOR248

... (3 indent ) Dual mode telephone (i.e., analog and digital) (455/553)

FOR249

.. (2 indent ) Remote private branch exchange (PBX) with wireless link to landline (455/554)

FOR250

.. (2 indent ) Integrated with other device (e.g., electronic notebook, personal digital assistant, etc.) (455/556)

FOR251

... (3 indent ) Having specific antenna arrangement (455/562)

FOR252

.. (2 indent ) Headgear (455/568)

FOR253

.. (2 indent ) Hands-free or loudspeaking arrangement (455/569)

FOR254

. (1 indent ) Portable or mobile (455/575)

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