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Electrical & Energy
Class Information
Number:
381/46
Name:
Electrical audio signal processing systems and devices
>
Description:
Sub-classes under this class:
Class Number
Class Name
Patents
381/
Binaural and stereophonic
0
381/1
Binaural and stereophonic
363
381/104
Including amplitude or volume control
313
381/110
Voice controlled
147
381/111
Circuitry combined with specific type microphone or loudspeaker
175
381/118
With musical instrument
100
381/119
With mixer
291
381/120
With amplifier
257
381/122
Having microphone
145
381/123
Switching
175
381/124
Miscellaneous
62
381/150
Electro-acoustic audio transducer
63
381/312
Hearing aids, electrical
406
381/54
Helium speech
7
381/55
Audio transducer protection circuitry
73
381/56
Monitoring of sound
283
381/58
Monitoring/measuring of audio devices
201
381/61
Sound effects
369
381/66
Dereverberators
104
381/67
Stethoscopes, electrical
141
381/70
Artificial larynx, electrical
38
381/71.1
Acoustical noise or sound cancellation
196
381/72
Hearing protectors, electrical
103
381/73.1
Sound or noise masking
91
381/74
Headphone circuits
218
381/75
Megaphones
18
381/76
Lecterns
8
381/77
One-way audio signal program distribution
221
381/86
Vehicle
484
381/87
Having non-electrical feature (e.g., mounting)
116
381/92
Directive circuits for microphones
358
381/93
Feedback suppression
150
381/94.1
Noise or distortion suppression
297
381/95
Microphone feedback
26
381/96
Loudspeaker feedback
175
381/97
Including phase control
104
381/98
Including frequency control
394
Patents under this class:
Patent Number
Title Of Patent
Date Issued
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