Class   381	ELECTRICAL AUDIO SIGNAL PROCESSING SYSTEMS AND DEVICES
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1

BINAURAL AND STEREOPHONIC

2

. (1 indent ) Broadcast or multiplex stereo

3

.. (2 indent ) FM final modulation

4

... (3 indent ) AM subcarrier

5

.... (4 indent ) Four discrete channels

6

....• (5 indent ) Having transmitter

7

.... (4 indent ) Switch-type detector or modulator

8

....• (5 indent ) Two diodes

9

....• (5 indent ) Four or more diodes

10

.... (4 indent ) Channel separation control

11

.... (4 indent ) Automatic switchover between mono and stereo modes

12

.... (4 indent ) Stereo indicators (e.g., stereo presence)

13

.... (4 indent ) Antinoise

14

.... (4 indent ) Having transmitter

15

.. (2 indent ) AM or both AM and angle final modulation

16

... (3 indent ) Having transmitter

17

. (1 indent ) Pseudo stereophonic

18

.. (2 indent ) Pseudo quadrasonic

19

. (1 indent ) Quadrasonic

20

.. (2 indent ) Matrix

21

... (3 indent ) 4-2-4

22

.... (4 indent ) Variable decoder

23

.... (4 indent ) With encoder

23.1

. (1 indent ) Hearing aid

300

. (1 indent ) Stereo speaker arrangement

301

.. (2 indent ) In furniture or clothing

302

.. (2 indent ) In vehicle

303

.. (2 indent ) Optimization

304

... (3 indent ) Enclosure orientation

305

... (3 indent ) Enclosure adaptation

306

.. (2 indent ) With image presentation means

307

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

308

.. (2 indent ) In single baffle

309

.. (2 indent ) Stereo earphone

310

... (3 indent ) Virtual positioning

311

... (3 indent ) Wireless or for use in diverse

26

. (1 indent ) Stereo sound pickup device (microphone)

27

. (1 indent ) Center channel

28

. (1 indent ) Amplifier

54

HELIUM SPEECH

55

AUDIO TRANSDUCER PROTECTION CIRCUITRY

56

MONITORING OF SOUND

57

. (1 indent ) Amplification control responsive to ambient sound

58

MONITORING/MEASURING OF AUDIO DEVICES

59

. (1 indent ) Loudspeaker operation

60

. (1 indent ) Testing of hearing aids

61

SOUND EFFECTS

62

. (1 indent ) Tremelo or vibrato effects

63

. (1 indent ) Reverberators

64

.. (2 indent ) Mechanical (e.g., reverberation chamber)

65

... (3 indent ) Helical spring

66

DEREVERBERATORS

67

STETHOSCOPES, ELECTRICAL

312

HEARING AIDS, ELECTRICAL

313

. (1 indent ) Directional

314

. (1 indent ) Programming interface circuitry

315

. (1 indent ) Remote control, wireless, or alarm

316

. (1 indent ) Frequency transposition

317

. (1 indent ) Noise compensation circuit

318

.. (2 indent ) Feedback suppression

319

. (1 indent ) With vacuum tube amplifier

320

. (1 indent ) Spectral control

321

. (1 indent ) Wideband gain control

322

. (1 indent ) Specified casing or housing

323

.. (2 indent ) Power supply or programming interface terminals

324

.. (2 indent ) Component mounting

325

.. (2 indent ) Cerumen protection

326

.. (2 indent ) Non-air-conducted sound delivery

327

.. (2 indent ) Spectacle

328

.. (2 indent ) Ear insert

329

... (3 indent ) Device for manipulation

330

.. (2 indent ) Hook over ear

331

.. (2 indent ) Inductive pickup

70

ARTIFICIAL LARYNX, ELECTRICAL

71.1

ACOUSTICAL NOISE OR SOUND CANCELLATION

71.2

. (1 indent ) Acoustic, nonairborne vibration sensing or counterwave emission

71.3

. (1 indent ) From appliance

71.4

. (1 indent ) Within cabin or compartment of vehicle

71.5

. (1 indent ) Within duct

71.6

. (1 indent ) Adjacent ear

71.7

. (1 indent ) Particular transducer or enclosure structure

71.8

. (1 indent ) Counterwave generation control path

71.9

.. (2 indent ) Nonacoustically derived reference signal

71.11

.. (2 indent ) Adaptive filter topology

71.12

.. (2 indent ) Algorithm or formula (e.g., LMS, Filtered-X, etc.)

71.13

.. (2 indent ) Analog or nonadaptive

71.14

.. (2 indent ) Tonal noise or particular frequency or band

72

HEARING PROTECTORS, ELECTRICAL

73.1

SOUND OR NOISE MASKING

74

HEADPHONE CIRCUITS

75

MEGAPHONES

76

LECTERNS

77

ONE-WAY AUDIO SIGNAL PROGRAM DISTRIBUTION

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. (1 indent ) Drive-in

79

. (1 indent ) Near field

80

. (1 indent ) Multiple channel

81

.. (2 indent ) With switching

82

. (1 indent ) Public address system

83

.. (2 indent ) Feedback suppression

84

.. (2 indent ) Spare amplifier substitution

85

.. (2 indent ) Speaker or channel switching

86

VEHICLE

87

HAVING NON-ELECTRICAL FEATURE (E.G., MOUNTING)

89

. (1 indent ) Loudspeakers driven in given phase relationship

332

. (1 indent ) And loudspeaker

333

.. (2 indent ) With furniture, clothing, or image presentation means

334

.. (2 indent ) Portable or for use in diverse environment

335

.. (2 indent ) Plural diaphragms, compartments, or housings

336

.. (2 indent ) Curved or angled housing

91

. (1 indent ) Having microphone

92

DIRECTIVE CIRCUITS FOR MICROPHONES

93

FEEDBACK SUPPRESSION

94.1

NOISE OR DISTORTION SUPPRESSION

94.2

. (1 indent ) Spectral adjustment

94.3

.. (2 indent ) In multiple frequency bands

94.4

. (1 indent ) Interpolation

94.5

. (1 indent ) Soft switching, muting, or noise gating

94.6

. (1 indent ) Hum or ground loop

94.7

. (1 indent ) Using signal channel and noise channel

94.8

. (1 indent ) Peak limiting or pulsive noise compensation

94.9

. (1 indent ) Feedforward circuitry for transducer compensation

95

MICROPHONE FEEDBACK

96

LOUDSPEAKER FEEDBACK

97

INCLUDING PHASE CONTROL

98

INCLUDING FREQUENCY CONTROL

99

. (1 indent ) Having crossover filter

100

.. (2 indent ) With active device

101

. (1 indent ) Automatic tone control

102

.. (2 indent ) With amplitude control

103

. (1 indent ) Having automatic equalizer circuit

104

INCLUDING AMPLITUDE OR VOLUME CONTROL

105

. (1 indent ) Remote

106

. (1 indent ) With amplitude compression/expansion

107

. (1 indent ) Automatic

108

.. (2 indent ) Including feedback

109

. (1 indent ) With manual volume control

110

VOICE CONTROLLED

111

CIRCUITRY COMBINED WITH SPECIFIC TYPE MICROPHONE OR LOUDSPEAKER

112

. (1 indent ) With carbon microphone

113

. (1 indent ) With electrostatic microphone

114

. (1 indent ) With piezoelectric microphone

115

. (1 indent ) With magnetic microphone

116

. (1 indent ) With electrostatic loudspeaker

117

. (1 indent ) With magnetic loudspeaker

118

WITH MUSICAL INSTRUMENT

119

WITH MIXER

120

WITH AMPLIFIER

121

. (1 indent ) Feedback

122

HAVING MICROPHONE

123

SWITCHING

150

ELECTRO-ACOUSTIC AUDIO TRANSDUCER

151

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

152

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

337

. (1 indent ) Having acoustic wave modifying structure

338

.. (2 indent ) With tubular waveguide or resonant element

339

.. (2 indent ) Sound intensifying or spreading element

340

... (3 indent ) Horn

341

.... (4 indent ) Inverted, folded, or curled

342

.... (4 indent ) Plural horns or diaphragms

343

.... (4 indent ) Phase plug

344

... (3 indent ) Mouthpiece

345

.. (2 indent ) Acoustic enclosure

346

... (3 indent ) Acoustic resistance

347

.... (4 indent ) On front side of diaphragm

348

.... (4 indent ) On rear side of diaphragm

349

... (3 indent ) Bass reflex (e.g., rear wave)

350

... (3 indent ) Front wave

351

... (3 indent ) Plural chambers

352

... (3 indent ) Having internal wave reflecting means

353

... (3 indent ) Acoustic damping or attenuating resonator

354

.. (2 indent ) Absorbing or attenuating element

160

.. (2 indent ) Reflecting element

161

. (1 indent ) With mechanical amplifier arrangement

162

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

163

. (1 indent ) Having bi-directional transducer

164

. (1 indent ) Thermal response to, or generation of, sound vibration

165

. (1 indent ) By modifying fluid flow

166

. (1 indent ) Having a fluid as a conducting element

167

.. (2 indent ) Ionized gap, spark, or flame

355

. (1 indent ) Housed microphone

356

.. (2 indent ) Directional

357

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

358

.... (4 indent ) Plural or variable characteristics

359

.. (2 indent ) Windscreen

360

.. (2 indent ) Cavity

361

.. (2 indent ) Mounting or support

362

... (3 indent ) Boom (other than on headset)

363

... (3 indent ) Stand or gooseneck

364

... (3 indent ) On body or clothing

365

... (3 indent ) In electronic apparatus or vehicle

366

... (3 indent ) Detachable from support

367

... (3 indent ) In headgear

368

... (3 indent ) On shock absorbing support

369

. (1 indent ) Microphone capsule only

170

.. (2 indent ) Compound

171

.. (2 indent ) Micromagnetic

172

.. (2 indent ) Light modifying

173

.. (2 indent ) Piezoelectric or ferroelectric

174

.. (2 indent ) Capacitive

175

.. (2 indent ) Semiconductor junction microphone

176

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

177

.. (2 indent ) Dynamic (e.g., magnetic)

178

.. (2 indent ) Vibrating electrical contract

179

.. (2 indent ) Resistive

180

... (3 indent ) Granular or carbon

181

.... (4 indent ) Differential

182

. (1 indent ) Plural or compound reproducers

370

.. (2 indent ) Headphone

371

... (3 indent ) Particular cup

372

.... (4 indent ) Having mechanical or acoustic sound attenuation

373

.... (4 indent ) Openable to ambient

374

... (3 indent ) Particular support structure

375

.... (4 indent ) And microphone

376

.... (4 indent ) Headgear

377

.... (4 indent ) Plural bands

378

.... (4 indent ) Single band

379

.... (4 indent ) adjustable

380

.... (4 indent ) Ear insert or bone conduction

381

.... (4 indent ) Hook over ear or spectacle

382

.... (4 indent ) Sound conducting tube

383

.... (4 indent ) Collapsible

384

... (3 indent ) Electrical hardware feature

184

.. (2 indent ) Different types of diaphragms

185

.. (2 indent ) Having common voice coil

186

.. (2 indent ) Plural diaphragms

385

. (1 indent ) Having body supported structure other than on head

386

. (1 indent ) Mounting or support feature of housed loudspeaker

387

.. (2 indent ) Directional, directible, or movable

388

.. (2 indent ) With furniture, clothing, or image display

389

.. (2 indent ) In vehicle

390

.. (2 indent ) Boom or support arm

391

.. (2 indent ) Grille

392

.. (2 indent ) Resilient

393

.. (2 indent ) electrical insulation feature

394

.. (2 indent ) Electrical hardware

395

.. (2 indent ) Mechanical detail

189

. (1 indent ) Having protective or sheilding feature

190

. (1 indent ) Electrostrictive, magnetostrictive, or piezoelectric

191

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

396

. (1 indent ) Electromagnetic (e.g., dyynamic)

397

.. (2 indent ) Cooling feature

398

.. (2 indent ) Having diaphragm support feature

399

.. (2 indent ) Conductive diaphragm (e.g., ribbon)

400

.. (2 indent ) Movable voice coil

401

... (3 indent ) Multiple voice coils

402

.... (4 indent ) For different frequencies

403

... (3 indent ) Centering from outside bobbin or diaphragm

404

.... (4 indent ) Spider

405

... (3 indent ) Centering from within bobbin or diaphragm

406

... (3 indent ) Field coil

407

... (3 indent ) Particular bobbin structure

408

... (3 indent ) Pattern

409

... (3 indent ) Wiring structure

410

... (3 indent ) Coil coating, winding layer structure, or wire

411

.. (2 indent ) Including adjustment mechanism

412

.. (2 indent ) Magnetic circuit

413

... (3 indent ) Having damping

414

... (3 indent ) Flux modifying means

415

... (3 indent ) Magnetic liquid

416

... (3 indent ) Inverted (e.g., within cone)

417

... (3 indent ) Armature diaphragm

418

... (3 indent ) Armature linked to diaphragm

419

... (3 indent ) Not having central magnetic portion

420

... (3 indent ) Having central magnetic portion

421

.... (4 indent ) Plural magnets

422

....• (5 indent ) Like poles adjacent

423

.. (2 indent ) Specified diaphragm shape or structure

424

... (3 indent ) Plural portions or sections

425

.... (4 indent ) Honeycomb

426

... (3 indent ) Critically defined material or lamination

427

.... (4 indent ) Metal

428

.... (4 indent ) Fibrous

429

... (3 indent ) Apertures in surface

430

... (3 indent ) Dome or round

431

... (3 indent ) Flat

432

... (3 indent ) Conical

433

.. (2 indent ) Basket detail

124

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.

FOR100

AUDIO BANDWIDTH COMPRESSION OR EXPANSION (381/29)

FOR101

. (1 indent ) With content reduction encoding (381/30)

FOR102

. (1 indent ) Delay line (381/33)

FOR103

TIME COMPRESSION OR EXPANSION (E.G., RUN LENGTH CODING) (381/34)

FOR104

. (1 indent ) With content reduction encoding (381/35)

FOR105

SPEECH ANALYSIS AND SYNTHESIS COMBINED (381/36)

FOR106

. (1 indent ) Using frequency (381/37)

FOR107

.. (2 indent ) Pitch (381/38)

FOR108

.. (2 indent ) Formants (381/39)

FOR109

. (1 indent ) Using time (381/40)

FOR110

SPEECH ANALYSIS (E.G., PHONEME RECOGNITION) (381/41)

FOR111

. (1 indent ) Voice recognition (381/42)

FOR112

. (1 indent ) Word recognition (381/43)

FOR113

.. (2 indent ) Phonetic typewriters (381/44)

FOR114

.. (2 indent ) Frequency domain (381/45)

FOR115

. (1 indent ) Detection of speech in noise (381/46)

FOR116

. (1 indent ) Signal to noise ratio enhancement (381/47)

FOR117

. (1 indent ) Speech parameter display (381/48)

FOR118

. (1 indent ) Speech pitch fundamental frequency (381/49)

FOR119

. (1 indent ) Speech formant frequencies (381/50)

FOR120

SPEECH SYNTHESIS (381/51)

FOR121

. (1 indent ) Speech from printed matter (381/52)

FOR122

. (1 indent ) Vocal tract model (381/53)

FOR123

ACOUSTICAL NOISE OR SOUND CANCELLATION (381/71)

FOR124

NOISE SUPPRESSION (381/94)

BINAURAL AND STEREOPHONIC

FOR125

. (1 indent ) Speaker arrangement (381/24)

FOR126

.. (2 indent ) Earphone (381/25)

FOR127

HEARING AIDS, ELECTRICAL (381/68)

FOR128

. (1 indent ) Directional (381/68.1)

FOR129

. (1 indent ) Frequency control (381/68.2)

FOR130

. (1 indent ) Bone conduction (381/68.4)

FOR131

. (1 indent ) Gain Control (381/68.3)

FOR132

. (1 indent ) Spectacle (381/68.5)

FOR133

. (1 indent ) Ear insert (381/68.6)

FOR134

. (1 indent ) Hook over ear (381/68.7)

FOR135

. (1 indent ) Specified casing or housing (381/69)

FOR136

.. (2 indent ) Having vacuum tube amplifier (381/69.1)

FOR137

.. (2 indent ) Having battery (381/69.2)

FOR138

. (1 indent ) Having enclosure or housing (381/138)

FOR139

.. (2 indent ) With loudspeaker (e.g., baffle, spatial orientation, etc.) (381/90)

FOR140

. (1 indent ) With acoustic wave modifying structure (381/153)

FOR141

.. (2 indent ) Including sound conducting tube (381/154)

FOR142

.. (2 indent ) Directional (381/155)

FOR143

.. (2 indent ) Sound intensifying or spreading element (381/156)

FOR144

... (3 indent ) Mouthpiece (381/157)

FOR145

.. (2 indent ) Absorbing or attenuating element (e.g., baffle, obstruction, damping) (381/158)

FOR146

.. (2 indent ) Enclosure or resonant cavity (381/159)

FOR147

. (1 indent ) Microphone (381/168)

FOR148

.. (2 indent ) With mounting or support feature (381/169)

FOR149

.. (2 indent ) Headphone (381/183)

FOR150

. (1 indent ) Having body supported structure (e.g., earphone) (381/187)

FOR151

. (1 indent ) With mounting or support feature (381/188)

FOR152

. (1 indent ) Electromagnetic (e.g., dynamic) (381/192)

FOR153

.. (2 indent ) Having feature of edge-supported diaphragm (381/193)

FOR154

.. (2 indent ) Movable voice coil (381/194)

FOR155

... (3 indent ) Multiple (e.g., double) (381/195)

FOR156

... (3 indent ) Pattern (381/196)

FOR157

... (3 indent ) Centering (381/197)

FOR158

.. (2 indent ) Including adjustment mechanism (381/198)

FOR159

.. (2 indent ) Magnetic circuit or core structure (381/199)

FOR160

... (3 indent ) Armature (381/200)

FOR161

... (3 indent ) Magnetic configuration (e.g., tubular or U-shaped) (381/201)

FOR162

.. (2 indent ) Specified diaphragm shape or structure (381/202)

FOR163

... (3 indent ) Flat (381/203)

FOR164

... (3 indent ) Conical (381/204)

FOR165

. (1 indent ) Electro-acoustical transducer mounting or support (381/205)

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