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Class Information
Number: 381/44
Name: Electrical audio signal processing systems and devices >

Sub-classes under this class:

Class Number Class Name Patents
381/ Binaural and stereophonic 0
381/1 Binaural and stereophonic 581
381/104 Including amplitude or volume control 632
381/110 Voice controlled 203
381/111 Circuitry combined with specific type microphone or loudspeaker 385
381/118 With musical instrument 139
381/119 With mixer 580
381/120 With amplifier 509
381/122 Having microphone 404
381/123 Switching 372
381/124 Miscellaneous 115
381/150 Electro-acoustic audio transducer 157
381/312 Hearing aids, electrical 941
381/54 Helium speech 8
381/55 Audio transducer protection circuitry 127
381/56 Monitoring of sound 640
381/58 Monitoring/measuring of audio devices 521
381/61 Sound effects 599
381/66 Dereverberators 241
381/67 Stethoscopes, electrical 183
381/70 Artificial larynx, electrical 40
381/71.1 Acoustical noise or sound cancellation 455
381/72 Hearing protectors, electrical 175
381/73.1 Sound or noise masking 168
381/74 Headphone circuits 530
381/75 Megaphones 24
381/76 Lecterns 8
381/77 One-way audio signal program distribution 475
381/86 Vehicle 771
381/87 Having non-electrical feature (e.g., mounting) 209
381/92 Directive circuits for microphones 760
381/93 Feedback suppression 278
381/94.1 Noise or distortion suppression 696
381/95 Microphone feedback 95
381/96 Loudspeaker feedback 281
381/97 Including phase control 223
381/98 Including frequency control 681

Patents under this class:

Patent Number Title Of Patent Date Issued

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