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Class 381 | ELECTRICAL AUDIO SIGNAL PROCESSING SYSTEMS AND DEVICES |
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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) |
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