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Electrical & Energy
Class Information
Number:
381/31
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
380
381/104
Including amplitude or volume control
343
381/110
Voice controlled
153
381/111
Circuitry combined with specific type microphone or loudspeaker
192
381/118
With musical instrument
105
381/119
With mixer
330
381/120
With amplifier
272
381/122
Having microphone
163
381/123
Switching
189
381/124
Miscellaneous
68
381/150
Electro-acoustic audio transducer
71
381/312
Hearing aids, electrical
452
381/54
Helium speech
7
381/55
Audio transducer protection circuitry
79
381/56
Monitoring of sound
308
381/58
Monitoring/measuring of audio devices
223
381/61
Sound effects
396
381/66
Dereverberators
107
381/67
Stethoscopes, electrical
145
381/70
Artificial larynx, electrical
38
381/71.1
Acoustical noise or sound cancellation
211
381/72
Hearing protectors, electrical
106
381/73.1
Sound or noise masking
99
381/74
Headphone circuits
231
381/75
Megaphones
18
381/76
Lecterns
8
381/77
One-way audio signal program distribution
252
381/86
Vehicle
509
381/87
Having non-electrical feature (e.g., mounting)
122
381/92
Directive circuits for microphones
396
381/93
Feedback suppression
158
381/94.1
Noise or distortion suppression
323
381/95
Microphone feedback
29
381/96
Loudspeaker feedback
185
381/97
Including phase control
115
381/98
Including frequency control
419
Patents under this class:
Patent Number
Title Of Patent
Date Issued
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