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Class Information
Number: 381
Name: Electrical audio signal processing systems and devices >
Description: This class provides for: (a) wired one-way electrical transmission or processing systems for audio signals, (b) Stereophonic systems, which are not elsewhere classified, (c) instrument or process for converting an electrical audio information signal to or from humanly audible form.










Class Number Class Name No. of Patents
381/71.1

Acoustical noise or sound cancellation

455
381/71.2

Acoustic, nonairborne vibration sensing or counterwave emission

135
381/71.6

Adjacent ear

243
381/71.8

Counterwave generation control path

133
381/71.11

Adaptive filter topology

329
381/71.12

Algorithm or formula (e.g., lms, filtered-x, etc.)

200
381/71.13

Analog or nonadaptive

60
381/71.9

Nonacoustically derived reference signal

95
381/71.14

Tonal noise or particular frequency or band

132
381/71.3

From appliance

84
381/71.7

Particular transducer or enclosure structure

175
381/71.4

Within cabin or compartment of vehicle

217
381/71.5

Within duct

174
381/70

Artificial larynx, electrical

40
381/55

Audio transducer protection circuitry

127
381/1

Binaural and stereophonic

581
 

Binaural and stereophonic

 
381/28

Amplifier

141
381/2

Broadcast or multiplex stereo

308
381/15

Am or both am and angle final modulation

150
381/16

Having transmitter

68
381/3

Fm final modulation

98
381/4

Am subcarrier

99
381/13

Antinoise

186
381/11

Automatic switchover between mono and stereo modes

92
381/10

Channel separation control

108
381/5

Four discrete channels

23
381/6

Having transmitter

24
381/14

Having transmitter

59
381/12

Stereo indicators (e.g., stereo presence)

64
381/7

Switch-type detector or modulator

94
381/9

Four or more diodes

4
381/8

Two diodes

3
381/27

Center channel

156
381/23.1

Hearing aid

145
381/17

Pseudo stereophonic

792
381/18

Pseudo quadrasonic

440
381/19

Quadrasonic

202
381/20

Matrix

141
381/21

4-2-4

69
381/22

Variable decoder

340
381/23

With encoder

266
381/26

Stereo sound pickup device (microphone)

161
381/300

Stereo speaker arrangement

299
381/301

In furniture or clothing

108
381/308

In single baffle

34
381/302

In vehicle

142
381/303

Optimization

155
381/305

Enclosure adaptation

43
381/304

Enclosure orientation

63
381/309

Stereo earphone

312
381/310

Virtual positioning

278
381/311

Wireless or for use in diverse

117
381/307

Surround (i.e., front plus rear or side)

226
381/306

With image presentation means

203
381/111

Circuitry combined with specific type microphone or loudspeaker

385
381/112

With carbon microphone

26
381/116

With electrostatic loudspeaker

98
381/113

With electrostatic microphone

210
381/117

With magnetic loudspeaker

79
381/115

With magnetic microphone

16
381/114

With piezoelectric microphone

60
381/66

Dereverberators

241
381/92

Directive circuits for microphones

760
381/150

Electro-acoustic audio transducer

157
381/151

Body contact wave transfer (e.g., bone conduction earphone, larynx microphone)

236
381/165

By modifying fluid flow

34
381/162

Detail of mechanical vibration coupling to transducer (e.g., tuned vibrating element)

82
381/152

Driven diverse static structure (e.g., wall, sounding board)

273
381/396

Electromagnetic (e.g., dyynamic)

460
381/433

Basket detail

80
381/399

Conductive diaphragm (e.g., ribbon)

77
381/397

Cooling feature

108
381/398

Having diaphragm support feature

376
381/411

Including adjustment mechanism

14
381/412

Magnetic circuit

396
381/417

Armature diaphragm

96
381/418

Armature linked to diaphragm

68
381/414

Flux modifying means

80
381/420

Having central magnetic portion

129
381/421

Plural magnets

125
381/422

Like poles adjacent

31
381/413

Having damping

42
381/416

Inverted (e.g., within cone)

8
381/415

Magnetic liquid

34
381/419

Not having central magnetic portion

40
381/400

Movable voice coil

178
381/403

Centering from outside bobbin or diaphragm

107
381/404

Spider

103
381/405

Centering from within bobbin or diaphragm

49
381/410

Coil coating, winding layer structure, or wire

89
381/406

Field coil

23
381/401

Multiple voice coils

156
381/402

For different frequencies

25
381/407

Particular bobbin structure

107
381/408

Pattern

92
381/409

Wiring structure

130
381/423

Specified diaphragm shape or structure

356
381/429

Apertures in surface

27
381/432

Conical

85
381/426

Critically defined material or lamination

115
381/428

Fibrous

40
381/427

Metal

22
381/430

Dome or round

117
381/431

Flat

317
381/424

Plural portions or sections

115
381/425

Honeycomb

36
381/190

Electrostrictive, magnetostrictive, or piezoelectric

432
381/166

Having a fluid as a conducting element

9
381/167

Ionized gap, spark, or flame

6
381/337

Having acoustic wave modifying structure

168
381/354

Absorbing or attenuating element

171
381/345

Acoustic enclosure

387
381/353

Acoustic damping or attenuating resonator

113
381/346

Acoustic resistance

53
381/347

On front side of diaphragm

38
381/348

On rear side of diaphragm

58
381/349

Bass reflex (e.g., rear wave)

191
381/350

Front wave

47
381/352

Having internal wave reflecting means

42
381/351

Plural chambers

146
381/160

Reflecting element

165
381/339

Sound intensifying or spreading element

82
381/340

Horn

172
381/341

Inverted, folded, or curled

66
381/343

Phase plug

67
381/342

Plural horns or diaphragms

84
381/344

Mouthpiece

29
381/338

With tubular waveguide or resonant element

219
381/163

Having bi-directional transducer

53
381/385

Having body supported structure other than on head

140
381/191

Having electrostatic element (e.g., electret, vibrating plate)

499
381/189

Having protective or sheilding feature

227
381/355

Housed microphone

386
381/360

Cavity

93
381/356

Directional

188
381/357

With plural sound ports (e.g., pressure gradient)

126
381/358

Plural or variable characteristics

48
381/361

Mounting or support

332
381/362

Boom (other than on headset)

55
381/366

Detachable from support

54
381/365

In electronic apparatus or vehicle

115
381/367

In headgear

57
381/364

On body or clothing

46
381/368

On shock absorbing support

61
381/363

Stand or gooseneck

47
381/359

Windscreen

74
381/369

Microphone capsule only

180
381/174

Capacitive

439
381/170

Compound

31
381/176

Conductive diaphragm (e.g., reed, ribbon)

53
381/177

Dynamic (e.g., magnetic)

30
381/172

Light modifying

58
381/171

Micromagnetic

13
381/173

Piezoelectric or ferroelectric

194
381/179

Resistive

6
381/180

Granular or carbon

8
381/181

Differential

15
381/175

Semiconductor junction microphone

138
381/178

Vibrating electrical contract

13
381/386

Mounting or support feature of housed loudspeaker

734
381/390

Boom or support arm

51
381/387

Directional, directible, or movable

217
381/394

Electrical hardware

75
381/393

Electrical insulation feature

9
381/391

Grille

80
381/389

In vehicle

166
381/395

Mechanical detail

229
381/392

Resilient

58
381/388

With furniture, clothing, or image display

316
381/182

Plural or compound reproducers

325
381/184

Different types of diaphragms

59
381/185

Having common voice coil

9
381/370

Headphone

468
381/384

Electrical hardware feature

186
381/371

Particular cup

170
381/372

Having mechanical or acoustic sound attenuation

103
381/373

Openable to ambient

47
381/374

Particular support structure

250
381/379

Adjustable

113
381/375

And microphone

189
381/383

Collapsible

40
381/380

Ear insert or bone conduction

422
381/376

Headgear

133
381/381

Hook over ear or spectacle

235
381/377

Plural bands

22
381/378

Single band

83
381/382

Sound conducting tube

99
381/186

Plural diaphragms

205
381/164

Thermal response to, or generation of, sound vibration

71
381/161

With mechanical amplifier arrangement

26
381/93

Feedback suppression

278
381/122

Having microphone

404
381/87

Having non-electrical feature (e.g., mounting)

209
381/332

And loudspeaker

167
381/336

Curved or angled housing

143
381/335

Plural diaphragms, compartments, or housings

234
381/334

Portable or for use in diverse environment

189
381/333

With furniture, clothing, or image presentation means

301
381/91

Having microphone

229
381/89

Loudspeakers driven in given phase relationship

148
381/74

Headphone circuits

530
381/312

Hearing aids, electrical

941
381/313

Directional

304
381/316

Frequency transposition

137
381/317

Noise compensation circuit

255
381/318

Feedback suppression

211
381/314

Programming interface circuitry

328
381/315

Remote control, wireless, or alarm

345
381/322

Specified casing or housing

690
381/325

Cerumen protection

96
381/324

Component mounting

341
381/328

Ear insert

729
381/329

Device for manipulation

90
381/330

Hook over ear

293
381/331

Inductive pickup

92
381/326

Non-air-conducted sound delivery

235
381/323

Power supply or programming interface terminals

278
381/327

Spectacle

58
381/320

Spectral control

280
381/321

Wideband gain control

238
381/319

With vacuum tube amplifier

6
381/72

Hearing protectors, electrical

175
381/54

Helium speech

8
381/104

Including amplitude or volume control

632
381/107

Automatic

658
381/108

Including feedback

164
381/105

Remote

117
381/106

With amplitude compression/expansion

458
381/109

With manual volume control

256
381/98

Including frequency control

681
381/101

Automatic tone control

149
381/102

With amplitude control

199
381/103

Having automatic equalizer circuit

420
381/99

Having crossover filter

199
381/100

With active device

58
381/97

Including phase control

223
381/76

Lecterns

8
381/96

Loudspeaker feedback

281
381/75

Megaphones

24
381/95

Microphone feedback

95
381/124

Miscellaneous

115
381/56

Monitoring of sound

640
381/57

Amplification control responsive to ambient sound

285
381/58

Monitoring/measuring of audio devices

521
381/59

Loudspeaker operation

382
381/60

Testing of hearing aids

330
381/94.1

Noise or distortion suppression

696
381/94.9

Feedforward circuitry for transducer compensation

37
381/94.6

Hum or ground loop

29
381/94.4

Interpolation

43
381/94.8

Peak limiting or pulsive noise compensation

94
381/94.5

Soft switching, muting, or noise gating

225
381/94.2

Spectral adjustment

271
381/94.3

In multiple frequency bands

341
381/94.7

Using signal channel and noise channel

229
381/77

One-way audio signal program distribution

475
381/78

Drive-in

17
381/80

Multiple channel

167
381/81

With switching

174
381/79

Near field

152
381/82

Public address system

129
381/83

Feedback suppression

161
381/84

Spare amplifier substitution

11
381/85

Speaker or channel switching

91
381/61

Sound effects

599
381/63

Reverberators

380
381/64

Mechanical (e.g., reverberation chamber)

19
381/65

Helical spring

10
381/62

Tremelo or vibrato effects

68
381/73.1

Sound or noise masking

168
381/67

Stethoscopes, electrical

183
381/123

Switching

372
381/86

Vehicle

771
381/110

Voice controlled

203
381/120

With amplifier

509
381/121

Feedback

111
381/119

With mixer

580
381/118

With musical instrument

139
 
 
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