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Class Information
Number: 381/40
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