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Class Information
Number: 375
Name: Pulse or digital communications >
Description: GENERAL STATEMENT OF THE CLASS SUBJECT MATTER










Class Number Class Name No. of Patents
375/216

Apparatus convertible to analog

253
375/217

Muting circuit and squelch

41
375/240

Bandwidth reduction or expansion

1530
375/241

Pulse code modulation

172
375/240.01

Television or motion video signal

2100
375/240.02

Adaptive

730
375/240.07

Feed back

107
375/240.06

Feed forward

78
375/240.03

Quantization

1231
375/240.05

Feed back

314
375/240.04

Feed forward

204
375/240.26

Associated signal processing

1496
375/240.27

Error detection or correction

738
375/240.29

Pre/post filtering

532
375/240.28

Synchronization

504
375/240.24

Block coding

1399
375/240.08

Feature based

417
375/240.09

Polygonal approximation

41
375/240.1

Separate coders

303
375/240.11

Subband coding

357
375/240.12

Predictive

2303
375/240.15

Bidirectional

724
375/240.13

Intra/inter selection

597
375/240.16

Motion vector

2527
375/240.17

Half-pixel refinement

295
375/240.14

Plural

620
375/240.25

Specific decompression process

1563
375/240.21

Subsampling

362
375/240.18

Transform

537
375/240.2

Discrete cosine

545
375/240.19

Wavelet

286
375/240.23

Variable length coding

491
375/240.22

Vector quantization

276
375/257

Cable systems and components

1170
375/258

Transformer coupling

361
375/218

Earth or water medium

21
375/229

Equalizers

1465
375/230

Automatic

524
375/232

Adaptive

2017
375/236

Accumulator or up/down counter

74
375/233

Decision feedback equalizer

1094
375/234

Fractionally spaced equalizer

177
375/235

Quadrature channels

291
375/231

Training period or initial set up

623
375/377

Miscellaneous

722
375/286

Multilevel

407
375/289

Bipolar signal

91
375/292

Disparity reduction

108
375/290

Partial response

124
375/291

Duobinary

38
375/293

Synchronized

178
375/294

Phase locked loop

132
375/288

Transmission line

155
375/287

With threshold level

138
375/353

Pulse amplitude modulation

192
375/242

Pulse code modulation

592
375/243

Correcting or reducing quantizing errors

226
375/244

Differential

254
375/246

Length coding

137
375/245

Quantizer or inverse quantizer

257
375/247

Single bit (delta)

247
375/249

Compand (overload prevention)

126
375/250

Redundancy removal

41
375/251

Syllabic

18
375/248

Nonamplitude delta (area, etc.)

19
375/252

Plural feedback loops

73
375/253

Length coding

170
375/254

Noise or distortion reduction

404
375/237

Pulse number modulation

52
375/239

Pulse position, frequency, or spacing modulation

419
375/256

Pulse transmission via radiated baseband

154
375/238

Pulse width modulation

654
375/316

Receivers

3914
375/320

Amplitude modulation

220
375/321

Single or vestigial sideband or suppressed carrier

227
375/322

Angle modulation

347
375/323

Combined phase shift keyed and frequency shift keyed

78
375/334

Frequency shift keying

417
375/336

Minimum shift keying

107
375/335

More than two frequencies

125
375/337

Separate mark and space channels

42
375/324

Particular demodulator

1246
375/326

Carrier recovery circuit or carrier tracking

1057
375/325

Including coherent detector

202
375/328

Including switching or gating (digital circuits)

283
375/327

Phase locked loop

865
375/329

Phase shift keying

697
375/333

Biphase (manchester code)

193
375/330

Differential (diphase)

234
375/331

More than two phases

178
375/332

Plural phase (>2)

402
375/317

Automatic baseline or threshold adjustment

482
375/319

Automatic bias circuit for dc restoration

265
375/318

Differential amplifier

164
375/344

Automatic frequency control

1150
375/345

Automatic gain control

1300
375/346

Interference or noise reduction

3168
375/350

By filtering (e.g., digital)

2193
375/347

Diversity (frequency or time)

2417
375/351

Gating, blanking, etc.

182
375/348

Intersymbol interference

776
375/349

Plural signal paths in receiver

1336
375/338

Interrupted carrier wave

22
375/339

Carrier controlling local generator

64
375/340

Particular pulse demodulator or detector

3029
375/343

Correlative or matched filter

1872
375/342

Locating predetermined portion of pulse

454
375/341

Maximum likelihood decoder or viterbi decoder

2140
375/352

With electromagnetic relay or solenoid

19
375/211

Repeaters

413
375/214

Including pulse regeneration or conversion

205
375/215

Phase locked loop

100
375/212

Ring or star configuration

51
375/213

Testing

138
375/130

Spread spectrum

2191
375/139

Chirp

101
375/140

Direct sequence

722
375/141

End-to-end transmission system

759
375/142

Having correlation-type receiver

906
375/143

Having matched-filter-type receiver

322
375/144

Having multi-receiver or interference cancellation

671
375/145

Having specific signaling for code synchronization

510
375/147

Receiver

1567
375/150

Correlation-type receiver

1890
375/151

Having saw or charge-transfer device

71
375/149

Having specific code synchronization

851
375/152

Matched-filter-type receiver

559
375/153

Having saw or charge-transfer device

44
375/148

Multi-receiver or interference cancellation

1587
375/146

Transmitter

1089
375/132

Frequency hopping

570
375/133

End-to-end transmission system

386
375/134

Having specific code acquisition or tracking

255
375/136

Receiver

535
375/137

Having specific code acquisition or tracking

222
375/135

Transmitter

385
375/131

Hybrid form

125
375/138

Time hopping

133
375/354

Synchronizers

2488
375/358

Feedback, receiver to transmitter

373
375/362

Frequency or phase control using synchronizing signal

784
375/369

Start - stop

147
375/370

With asynchronous data

119
375/363

Synchronization bit insertion into artificially created gaps

197
375/364

Synchronization signals with unique amplitude, polarity, length, or frequency

420
375/365

Synchronization word

615
375/366

Plurality of synchronization words

250
375/367

Pseudo noise

448
375/368

Synchronizer pattern recognizers

737
375/356

Network synchronizing more than two stations

961
375/371

Phase displacement, slip or jitter correction

2036
375/372

Elastic buffer

495
375/373

Phase locking

1084
375/376

Phase locked loop

3064
375/374

With charge pump or up and down counters

383
375/375

With frequency detector and phase detector

844
375/359

Self-synchronizing signal (self-clocking codes, etc.)

422
375/361

Manchester code or biphase code

167
375/360

With transition detector

382
375/357

Synchronization failure prevention

472
375/355

Synchronizing the sampling time of digital data

1677
375/259

Systems using alternating or pulsating current

1585
375/268

Amplitude modulation

173
375/270

Vestigial or single sideband or suppressed carrier

180
375/269

With phase or frequency shift keying

207
375/271

Angle modulation

165
375/272

Frequency shift keying

244
375/278

Antinoise or distortion

144
375/273

Combined with phase shift keying

50
375/274

Minimum shift keying

82
375/275

More than two frequencies

86
375/276

One cycle or less per bit

39
375/277

Vestigial or single sideband, or suppressed carrier

48
375/279

Phase shift keying

339
375/284

Antinoise or distortion

222
375/282

Biphase (manchester codes)

131
375/283

Differential phase shift keying (diphase)

162
375/280

More than two phases

155
375/281

Quaternary

148
375/285

Antinoise or distortion

1324
375/260

Plural channels for transmission of a single pulse train

5039
375/267

Diversity

3266
375/261

Quadrature amplitude modulation

1183
375/262

Maximum likelihood decoder or viterbi decoder

1254
375/264

Multilevel

233
375/263

Partial response

97
375/265

Trellis encoder or trellis decoder

1077
375/224

Testing

1331
375/225

Data rate

452
375/226

Phase error or phase jitter

553
375/227

Signal noise

545
375/228

With indicator

241
375/219

Transceivers

2218
375/221

Loopback mode

287
375/222

Modems (data sets)

2574
375/223

Angle modulation

150
375/220

Transmission interface between two stations or terminals

1033
375/295

Transmitters

3044
375/300

Amplitude modulation

302
375/301

Single or vestigial sideband or suppressed carrier

158
375/302

Angle modulation

353
375/303

Frequency shift keying

254
375/304

Antenna tuning with frequency shift

42
375/305

Minimum shift keying

103
375/306

One oscillator

104
375/307

Two or more oscillators

69
375/308

Phase shift keying

730
375/296

Antinoise or distortion (includes predistortion)

2026
375/297

Power amplifier

1119
375/309

Keying circuits

61
375/311

Automatic

21
375/314

Including auxiliary control tube

7
375/313

Key shock or click prevention

5
375/315

Modulation by absorption of signal, changing antenna dimension or changing antenna impedance

40
375/312

Power or bias voltage supply keying

70
375/310

Remote controlled

29
375/299

Plural diversity

1499
375/298

Quadrature amplitude modulation

820
 
 
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