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Class Information
Number: 381/25
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	379
381/104	Including amplitude or volume control	341
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	271
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	228
381/75	Megaphones	18
381/76	Lecterns	8
381/77	One-way audio signal program distribution	250
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	156
381/94.1	Noise or distortion suppression	323
381/95	Microphone feedback	28
381/96	Loudspeaker feedback	184
381/97	Including phase control	115
381/98	Including frequency control	419