| Class 381 | ELECTRICAL AUDIO SIGNAL PROCESSING SYSTEMS AND DEVICES |
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![[List of Pre Grant Publications for class 381 subclass 1]](../as.gif) | ![[List of Patents for class 381 subclass 1]](../ps.gif) | 1 | BINAURAL AND STEREOPHONIC |
| | 2 |  Broadcast or multiplex stereo |
| | 17 | Pseudo stereophonic |
| | 19 | Quadrasonic |
| | 23.1 | Hearing aid |
| | 300 | Stereo speaker arrangement |
| | 301 |  In furniture or clothing |
| | 302 | In vehicle |
| | 303 | Optimization |
| | 306 | With image presentation means |
| | 307 | Surround (i.e., front plus rear or side) |
| | 308 | In single baffle |
| | 309 | Stereo earphone |
| | 26 | Stereo sound pickup device (microphone) |
| | 27 | Center channel |
| | 28 | Amplifier |
| | 54 | HELIUM SPEECH |
| | 55 | AUDIO TRANSDUCER PROTECTION CIRCUITRY |
| | 56 | MONITORING OF SOUND |
| | 58 | MONITORING/MEASURING OF AUDIO DEVICES |
| | 61 | SOUND EFFECTS |
| | 66 | DEREVERBERATORS |
| | 67 | STETHOSCOPES, ELECTRICAL |
| | 312 | HEARING AIDS, ELECTRICAL |
| | 313 | Directional |
| | 314 | Programming interface circuitry |
| | 315 | Remote control, wireless, or alarm |
| | 316 | Frequency transposition |
| | 317 | Noise compensation circuit |
| | 319 | With vacuum tube amplifier |
| | 320 | Spectral control |
| | 321 | Wideband gain control |
| | 322 | Specified casing or housing |
| | 70 | ARTIFICIAL LARYNX, ELECTRICAL |
| | 71.1 | ACOUSTICAL NOISE OR SOUND CANCELLATION |
| | 71.2 | Acoustic, nonairborne vibration sensing or counterwave emission |
| | 71.3 | From appliance |
| | 71.4 | Within cabin or compartment of vehicle |
| | 71.5 | Within duct |
| | 71.6 | Adjacent ear |
| | 71.7 | Particular transducer or enclosure structure |
| | 71.8 | Counterwave generation control path |
| | 72 | HEARING PROTECTORS, ELECTRICAL |
| | 73.1 | SOUND OR NOISE MASKING |
| | 74 | HEADPHONE CIRCUITS |
| | 75 | MEGAPHONES |
| | 76 | LECTERNS |
| | 77 | ONE-WAY AUDIO SIGNAL PROGRAM DISTRIBUTION |
| | 86 | VEHICLE |
| | 87 | HAVING NON-ELECTRICAL FEATURE (E.G., MOUNTING) |
| | 89 | Loudspeakers driven in given phase relationship |
| | 332 | And loudspeaker |
| | 333 | With furniture, clothing, or image presentation means |
| | 334 | Portable or for use in diverse environment |
| | 335 | Plural diaphragms, compartments, or housings |
| | 336 | Curved or angled housing |
| | 91 | Having microphone |
| | 92 | DIRECTIVE CIRCUITS FOR MICROPHONES |
| | 93 | FEEDBACK SUPPRESSION |
| | 94.1 | NOISE OR DISTORTION SUPPRESSION |
| | 94.2 | Spectral adjustment |
| | 94.4 | Interpolation |
| | 94.5 | Soft switching, muting, or noise gating |
| | 94.6 | Hum or ground loop |
| | 94.7 | Using signal channel and noise channel |
| | 94.8 | Peak limiting or pulsive noise compensation |
| | 94.9 | Feedforward circuitry for transducer compensation |
| | 95 | MICROPHONE FEEDBACK |
| | 96 | LOUDSPEAKER FEEDBACK |
| | 97 | INCLUDING PHASE CONTROL |
| | 98 | INCLUDING FREQUENCY CONTROL |
| | 104 | INCLUDING AMPLITUDE OR VOLUME CONTROL |
| | 110 | VOICE CONTROLLED |
| | 111 | CIRCUITRY COMBINED WITH SPECIFIC TYPE MICROPHONE OR LOUDSPEAKER |
| | 112 | With carbon microphone |
| | 113 | With electrostatic microphone |
| | 114 | With piezoelectric microphone |
| | 115 | With magnetic microphone |
| | 116 | With electrostatic loudspeaker |
| | 117 | With magnetic loudspeaker |
| | 118 | WITH MUSICAL INSTRUMENT |
| | 119 | WITH MIXER |
| | 120 | WITH AMPLIFIER |
| | 122 | HAVING MICROPHONE |
| | 123 | SWITCHING |
| | 150 | ELECTRO-ACOUSTIC AUDIO TRANSDUCER |
| | 151 | Body contact wave transfer (e.g., bone conduction earphone, larynx microphone) |
| | 152 | Driven diverse static structure (e.g., wall, sounding board) |
| | 337 | Having acoustic wave modifying structure |
| | 338 | With tubular waveguide or resonant element |
| | 339 | Sound intensifying or spreading element |
| | 345 | Acoustic enclosure |
| | 346 |  Acoustic resistance |
| | 349 | Bass reflex (e.g., rear wave) |
| | 350 | Front wave |
| | 351 | Plural chambers |
| | 352 | Having internal wave reflecting means |
| | 353 | Acoustic damping or attenuating resonator |
| | 354 | Absorbing or attenuating element |
| | 160 | Reflecting element |
| | 161 | With mechanical amplifier arrangement |
| | 162 | Detail of mechanical vibration coupling to transducer (e.g., tuned vibrating element) |
| | 163 | Having bi-directional transducer |
| | 164 | Thermal response to, or generation of, sound vibration |
| | 165 | By modifying fluid flow |
| | 166 | Having a fluid as a conducting element |
| | 355 | Housed microphone |
| | 369 | Microphone capsule only |
| | 170 | Compound |
| | 171 | Micromagnetic |
| | 172 | Light modifying |
| | 173 | Piezoelectric or ferroelectric |
| | 174 | Capacitive |
| | 175 | Semiconductor junction microphone |
| | 176 | Conductive diaphragm (e.g., reed, ribbon) |
| | 177 | Dynamic (e.g., magnetic) |
| | 178 | Vibrating electrical contract |
| | 179 | Resistive |
| | 182 | Plural or compound reproducers |
| | 370 | Headphone |
| | 371 | Particular cup |
| | 374 | Particular support structure |
| | 375 |  And microphone |
| | 376 | Headgear |
| | 377 | Plural bands |
| | 378 | Single band |
| | 379 | adjustable |
| | 380 | Ear insert or bone conduction |
| | 381 | Hook over ear or spectacle |
| | 382 | Sound conducting tube |
| | 383 | Collapsible |
| | 384 | Electrical hardware feature |
| | 184 | Different types of diaphragms |
| | 185 | Having common voice coil |
| | 186 | Plural diaphragms |
| | 385 | Having body supported structure other than on head |
| | 386 | Mounting or support feature of housed loudspeaker |
| | 387 | Directional, directible, or movable |
| | 388 | With furniture, clothing, or image display |
| | 389 | In vehicle |
| | 390 | Boom or support arm |
| | 391 | Grille |
| | 392 | Resilient |
| | 393 | electrical insulation feature |
| | 394 | Electrical hardware |
| | 395 | Mechanical detail |
| | 189 | Having protective or sheilding feature |
| | 190 | Electrostrictive, magnetostrictive, or piezoelectric |
| | 191 | Having electrostatic element (e.g., electret, vibrating plate) |
| | 396 | Electromagnetic (e.g., dyynamic) |
| | 397 | Cooling feature |
| | 398 | Having diaphragm support feature |
| | 399 | Conductive diaphragm (e.g., ribbon) |
| | 400 | Movable voice coil |
| | 401 | Multiple voice coils |
| | 403 | Centering from outside bobbin or diaphragm |
| | 405 | Centering from within bobbin or diaphragm |
| | 406 | Field coil |
| | 407 | Particular bobbin structure |
| | 408 | Pattern |
| | 409 | Wiring structure |
| | 410 | Coil coating, winding layer structure, or wire |
| | 411 | Including adjustment mechanism |
| | 412 | Magnetic circuit |
| | 413 | Having damping |
| | 414 | Flux modifying means |
| | 415 | Magnetic liquid |
| | 416 | Inverted (e.g., within cone) |
| | 417 | Armature diaphragm |
| | 418 | Armature linked to diaphragm |
| | 419 | Not having central magnetic portion |
| | 420 | Having central magnetic portion |
| | 423 | Specified diaphragm shape or structure |
| | 424 | Plural portions or sections |
| | 426 | Critically defined material or lamination |
| | 429 | Apertures in surface |
| | 430 | Dome or round |
| | 431 | Flat |
| | 432 | Conical |
| | 433 | 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) |
| FOR103 | TIME COMPRESSION OR EXPANSION (E.G., RUN LENGTH CODING) (381/34) |
| FOR105 | SPEECH ANALYSIS AND SYNTHESIS COMBINED (381/36) |
| FOR110 | SPEECH ANALYSIS (E.G., PHONEME RECOGNITION) (381/41) |
| FOR111 | Voice recognition (381/42) |
| FOR112 | Word recognition (381/43) |
| FOR115 | Detection of speech in noise (381/46) |
| FOR116 | Signal to noise ratio enhancement (381/47) |
| FOR117 | Speech parameter display (381/48) |
| FOR118 | Speech pitch fundamental frequency (381/49) |
| FOR119 | Speech formant frequencies (381/50) |
| FOR120 | SPEECH SYNTHESIS (381/51) |
| FOR123 | ACOUSTICAL NOISE OR SOUND CANCELLATION (381/71) |
| FOR124 | NOISE SUPPRESSION (381/94) |
| BINAURAL AND STEREOPHONIC |
| FOR127 | HEARING AIDS, ELECTRICAL (381/68) |
| FOR128 | Directional (381/68.1) |
| FOR129 | Frequency control (381/68.2) |
| FOR130 | Bone conduction (381/68.4) |
| FOR131 | Gain Control (381/68.3) |
| FOR132 | Spectacle (381/68.5) |
| FOR133 | Ear insert (381/68.6) |
| FOR134 | Hook over ear (381/68.7) |
| FOR135 | Specified casing or housing (381/69) |
| FOR138 | Having enclosure or housing (381/138) |
| FOR140 | With acoustic wave modifying structure (381/153) |
| FOR141 | Including sound conducting tube (381/154) |
| FOR142 | Directional (381/155) |
| FOR143 | Sound intensifying or spreading element (381/156) |
| FOR145 | Absorbing or attenuating element (e.g., baffle, obstruction, damping) (381/158) |
| FOR146 | Enclosure or resonant cavity (381/159) |
| FOR147 | Microphone (381/168) |
| FOR150 | Having body supported structure (e.g., earphone) (381/187) |
| FOR151 | With mounting or support feature (381/188) |
| FOR152 | Electromagnetic (e.g., dynamic) (381/192) |
| FOR153 | Having feature of edge-supported diaphragm (381/193) |
| FOR154 | Movable voice coil (381/194) |
| FOR158 | Including adjustment mechanism (381/198) |
| FOR159 | Magnetic circuit or core structure (381/199) |
| FOR162 | Specified diaphragm shape or structure (381/202) |
| FOR165 | Electro-acoustical transducer mounting or support (381/205) |